st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <fontconfig/fontconfig.h>
  31 #include <wchar.h>
  32
  33 #include "arg.h"
  34
  35 char *argv0;
  36
  37 #define Glyph Glyph_
  38 #define Font Font_
  39
  40 #if   defined(__linux)
  41  #include <pty.h>
  42 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  43  #include <util.h>
  44 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  45  #include <libutil.h>
  46 #endif
  47
  48
  49 /* XEMBED messages */
  50 #define XEMBED_FOCUS_IN  4
  51 #define XEMBED_FOCUS_OUT 5
  52
  53 /* Arbitrary sizes */
  54 #define UTF_INVALID   0xFFFD
  55 #define UTF_SIZ       4
  56 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   ESC_BUF_SIZ
  59 #define STR_ARG_SIZ   ESC_ARG_SIZ
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  69 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  70 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  71 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  72 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  73 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == '\177')
  74 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  75 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  76 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  77 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  78 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  79 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
  80 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  81
  82 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  83 #define IS_TRUECOL(x)    (1 << 24 & (x))
  84 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  85 #define TRUEGREEN(x)     (((x) & 0xff00))
  86 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  87
  88
  89 enum glyph_attribute {
  90         ATTR_NULL      = 0,
  91         ATTR_BOLD      = 1 << 0,
  92         ATTR_FAINT     = 1 << 1,
  93         ATTR_ITALIC    = 1 << 2,
  94         ATTR_UNDERLINE = 1 << 3,
  95         ATTR_BLINK     = 1 << 4,
  96         ATTR_REVERSE   = 1 << 5,
  97         ATTR_INVISIBLE = 1 << 6,
  98         ATTR_STRUCK    = 1 << 7,
  99         ATTR_WRAP      = 1 << 8,
 100         ATTR_WIDE      = 1 << 9,
 101         ATTR_WDUMMY    = 1 << 10,
 102 };
 103
 104 enum cursor_movement {
 105         CURSOR_SAVE,
 106         CURSOR_LOAD
 107 };
 108
 109 enum cursor_state {
 110         CURSOR_DEFAULT  = 0,
 111         CURSOR_WRAPNEXT = 1,
 112         CURSOR_ORIGIN   = 2
 113 };
 114
 115 enum term_mode {
 116         MODE_WRAP        = 1 << 0,
 117         MODE_INSERT      = 1 << 1,
 118         MODE_APPKEYPAD   = 1 << 2,
 119         MODE_ALTSCREEN   = 1 << 3,
 120         MODE_CRLF        = 1 << 4,
 121         MODE_MOUSEBTN    = 1 << 5,
 122         MODE_MOUSEMOTION = 1 << 6,
 123         MODE_REVERSE     = 1 << 7,
 124         MODE_KBDLOCK     = 1 << 8,
 125         MODE_HIDE        = 1 << 9,
 126         MODE_ECHO        = 1 << 10,
 127         MODE_APPCURSOR   = 1 << 11,
 128         MODE_MOUSESGR    = 1 << 12,
 129         MODE_8BIT        = 1 << 13,
 130         MODE_BLINK       = 1 << 14,
 131         MODE_FBLINK      = 1 << 15,
 132         MODE_FOCUS       = 1 << 16,
 133         MODE_MOUSEX10    = 1 << 17,
 134         MODE_MOUSEMANY   = 1 << 18,
 135         MODE_BRCKTPASTE  = 1 << 19,
 136         MODE_PRINT       = 1 << 20,
 137         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 138                           |MODE_MOUSEMANY,
 139 };
 140
 141 enum charset {
 142         CS_GRAPHIC0,
 143         CS_GRAPHIC1,
 144         CS_UK,
 145         CS_USA,
 146         CS_MULTI,
 147         CS_GER,
 148         CS_FIN
 149 };
 150
 151 enum escape_state {
 152         ESC_START      = 1,
 153         ESC_CSI        = 2,
 154         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 155         ESC_ALTCHARSET = 8,
 156         ESC_STR_END    = 16, /* a final string was encountered */
 157         ESC_TEST       = 32, /* Enter in test mode */
 158 };
 159
 160 enum window_state {
 161         WIN_VISIBLE = 1,
 162         WIN_REDRAW  = 2,
 163         WIN_FOCUSED = 4
 164 };
 165
 166 enum selection_type {
 167         SEL_REGULAR = 1,
 168         SEL_RECTANGULAR = 2
 169 };
 170
 171 enum selection_snap {
 172         SNAP_WORD = 1,
 173         SNAP_LINE = 2
 174 };
 175
 176 typedef unsigned char uchar;
 177 typedef unsigned int uint;
 178 typedef unsigned long ulong;
 179 typedef unsigned short ushort;
 180
 181 typedef XftDraw *Draw;
 182 typedef XftColor Color;
 183
 184 typedef struct {
 185         char c[UTF_SIZ]; /* character code */
 186         ushort mode;      /* attribute flags */
 187         uint32_t fg;      /* foreground  */
 188         uint32_t bg;      /* background  */
 189 } Glyph;
 190
 191 typedef Glyph *Line;
 192
 193 typedef struct {
 194         Glyph attr; /* current char attributes */
 195         int x;
 196         int y;
 197         char state;
 198 } TCursor;
 199
 200 /* CSI Escape sequence structs */
 201 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 202 typedef struct {
 203         char buf[ESC_BUF_SIZ]; /* raw string */
 204         int len;               /* raw string length */
 205         char priv;
 206         int arg[ESC_ARG_SIZ];
 207         int narg;              /* nb of args */
 208         char mode;
 209 } CSIEscape;
 210
 211 /* STR Escape sequence structs */
 212 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 213 typedef struct {
 214         char type;             /* ESC type ... */
 215         char buf[STR_BUF_SIZ]; /* raw string */
 216         int len;               /* raw string length */
 217         char *args[STR_ARG_SIZ];
 218         int narg;              /* nb of args */
 219 } STREscape;
 220
 221 /* Internal representation of the screen */
 222 typedef struct {
 223         int row;      /* nb row */
 224         int col;      /* nb col */
 225         Line *line;   /* screen */
 226         Line *alt;    /* alternate screen */
 227         bool *dirty;  /* dirtyness of lines */
 228         TCursor c;    /* cursor */
 229         int top;      /* top    scroll limit */
 230         int bot;      /* bottom scroll limit */
 231         int mode;     /* terminal mode flags */
 232         int esc;      /* escape state flags */
 233         char trantbl[4]; /* charset table translation */
 234         int charset;  /* current charset */
 235         int icharset; /* selected charset for sequence */
 236         bool numlock; /* lock numbers in keyboard */
 237         bool *tabs;
 238 } Term;
 239
 240 /* Purely graphic info */
 241 typedef struct {
 242         Display *dpy;
 243         Colormap cmap;
 244         Window win;
 245         Drawable buf;
 246         Atom xembed, wmdeletewin, netwmname, netwmpid;
 247         XIM xim;
 248         XIC xic;
 249         Draw draw;
 250         Visual *vis;
 251         XSetWindowAttributes attrs;
 252         int scr;
 253         bool isfixed; /* is fixed geometry? */
 254         int l, t; /* left and top offset */
 255         int gm; /* geometry mask */
 256         int tw, th; /* tty width and height */
 257         int w, h; /* window width and height */
 258         int ch; /* char height */
 259         int cw; /* char width  */
 260         char state; /* focus, redraw, visible */
 261 } XWindow;
 262
 263 typedef struct {
 264         uint b;
 265         uint mask;
 266         char *s;
 267 } Mousekey;
 268
 269 typedef struct {
 270         KeySym k;
 271         uint mask;
 272         char *s;
 273         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 274         signed char appkey;    /* application keypad */
 275         signed char appcursor; /* application cursor */
 276         signed char crlf;      /* crlf mode          */
 277 } Key;
 278
 279 typedef struct {
 280         int mode;
 281         int type;
 282         int snap;
 283         /*
 284          * Selection variables:
 285          * nb – normalized coordinates of the beginning of the selection
 286          * ne – normalized coordinates of the end of the selection
 287          * ob – original coordinates of the beginning of the selection
 288          * oe – original coordinates of the end of the selection
 289          */
 290         struct {
 291                 int x, y;
 292         } nb, ne, ob, oe;
 293
 294         char *clip;
 295         Atom xtarget;
 296         bool alt;
 297         struct timespec tclick1;
 298         struct timespec tclick2;
 299 } Selection;
 300
 301 typedef union {
 302         int i;
 303         uint ui;
 304         float f;
 305         const void *v;
 306 } Arg;
 307
 308 typedef struct {
 309         uint mod;
 310         KeySym keysym;
 311         void (*func)(const Arg *);
 312         const Arg arg;
 313 } Shortcut;
 314
 315 /* function definitions used in config.h */
 316 static void clippaste(const Arg *);
 317 static void numlock(const Arg *);
 318 static void selpaste(const Arg *);
 319 static void xzoom(const Arg *);
 320 static void xzoomabs(const Arg *);
 321 static void xzoomreset(const Arg *);
 322 static void printsel(const Arg *);
 323 static void printscreen(const Arg *) ;
 324 static void toggleprinter(const Arg *);
 325
 326 /* Config.h for applying patches and the configuration. */
 327 #include "config.h"
 328
 329 /* Font structure */
 330 typedef struct {
 331         int height;
 332         int width;
 333         int ascent;
 334         int descent;
 335         short lbearing;
 336         short rbearing;
 337         XftFont *match;
 338         FcFontSet *set;
 339         FcPattern *pattern;
 340 } Font;
 341
 342 /* Drawing Context */
 343 typedef struct {
 344         Color col[MAX(LEN(colorname), 256)];
 345         Font font, bfont, ifont, ibfont;
 346         GC gc;
 347 } DC;
 348
 349 static void die(const char *, ...);
 350 static void draw(void);
 351 static void redraw(int);
 352 static void drawregion(int, int, int, int);
 353 static void execsh(void);
 354 static void sigchld(int);
 355 static void run(void);
 356
 357 static void csidump(void);
 358 static void csihandle(void);
 359 static void csiparse(void);
 360 static void csireset(void);
 361 static int eschandle(uchar ascii);
 362 static void strdump(void);
 363 static void strhandle(void);
 364 static void strparse(void);
 365 static void strreset(void);
 366
 367 static int tattrset(int);
 368 static void tprinter(char *, size_t);
 369 static void tdumpsel(void);
 370 static void tdumpline(int);
 371 static void tdump(void);
 372 static void tclearregion(int, int, int, int);
 373 static void tcursor(int);
 374 static void tdeletechar(int);
 375 static void tdeleteline(int);
 376 static void tinsertblank(int);
 377 static void tinsertblankline(int);
 378 static int tlinelen(int);
 379 static void tmoveto(int, int);
 380 static void tmoveato(int, int);
 381 static void tnew(int, int);
 382 static void tnewline(int);
 383 static void tputtab(int);
 384 static void tputc(char *, int);
 385 static void treset(void);
 386 static void tresize(int, int);
 387 static void tscrollup(int, int);
 388 static void tscrolldown(int, int);
 389 static void tsetattr(int *, int);
 390 static void tsetchar(char *, Glyph *, int, int);
 391 static void tsetscroll(int, int);
 392 static void tswapscreen(void);
 393 static void tsetdirt(int, int);
 394 static void tsetdirtattr(int);
 395 static void tsetmode(bool, bool, int *, int);
 396 static void tfulldirt(void);
 397 static void techo(char *, int);
 398 static void tcontrolcode(uchar );
 399 static void tdectest(char );
 400 static int32_t tdefcolor(int *, int *, int);
 401 static void tdeftran(char);
 402 static inline bool match(uint, uint);
 403 static void ttynew(void);
 404 static void ttyread(void);
 405 static void ttyresize(void);
 406 static void ttysend(char *, size_t);
 407 static void ttywrite(const char *, size_t);
 408 static void tstrsequence(uchar c);
 409
 410 static void xdraws(char *, Glyph, int, int, int, int);
 411 static void xhints(void);
 412 static void xclear(int, int, int, int);
 413 static void xdrawcursor(void);
 414 static void xinit(void);
 415 static void xloadcols(void);
 416 static int xsetcolorname(int, const char *);
 417 static int xgeommasktogravity(int);
 418 static int xloadfont(Font *, FcPattern *);
 419 static void xloadfonts(char *, double);
 420 static int xloadfontset(Font *);
 421 static void xsettitle(char *);
 422 static void xresettitle(void);
 423 static void xsetpointermotion(int);
 424 static void xseturgency(int);
 425 static void xsetsel(char *);
 426 static void xtermclear(int, int, int, int);
 427 static void xunloadfont(Font *);
 428 static void xunloadfonts(void);
 429 static void xresize(int, int);
 430
 431 static void expose(XEvent *);
 432 static void visibility(XEvent *);
 433 static void unmap(XEvent *);
 434 static char *kmap(KeySym, uint);
 435 static void kpress(XEvent *);
 436 static void cmessage(XEvent *);
 437 static void cresize(int, int);
 438 static void resize(XEvent *);
 439 static void focus(XEvent *);
 440 static void brelease(XEvent *);
 441 static void bpress(XEvent *);
 442 static void bmotion(XEvent *);
 443 static void selnotify(XEvent *);
 444 static void selclear(XEvent *);
 445 static void selrequest(XEvent *);
 446
 447 static void selinit(void);
 448 static void selnormalize(void);
 449 static inline bool selected(int, int);
 450 static char *getsel(void);
 451 static void selcopy(void);
 452 static void selscroll(int, int);
 453 static void selsnap(int, int *, int *, int);
 454 static void getbuttoninfo(XEvent *);
 455 static void mousereport(XEvent *);
 456
 457 static size_t utf8decode(char *, long *, size_t);
 458 static long utf8decodebyte(char, size_t *);
 459 static size_t utf8encode(long, char *, size_t);
 460 static char utf8encodebyte(long, size_t);
 461 static size_t utf8len(char *);
 462 static size_t utf8validate(long *, size_t);
 463
 464 static ssize_t xwrite(int, const char *, size_t);
 465 static void *xmalloc(size_t);
 466 static void *xrealloc(void *, size_t);
 467 static char *xstrdup(char *);
 468
 469 static void usage(void);
 470
 471 static void (*handler[LASTEvent])(XEvent *) = {
 472         [KeyPress] = kpress,
 473         [ClientMessage] = cmessage,
 474         [ConfigureNotify] = resize,
 475         [VisibilityNotify] = visibility,
 476         [UnmapNotify] = unmap,
 477         [Expose] = expose,
 478         [FocusIn] = focus,
 479         [FocusOut] = focus,
 480         [MotionNotify] = bmotion,
 481         [ButtonPress] = bpress,
 482         [ButtonRelease] = brelease,
 483         [SelectionClear] = selclear,
 484         [SelectionNotify] = selnotify,
 485         [SelectionRequest] = selrequest,
 486 };
 487
 488 /* Globals */
 489 static DC dc;
 490 static XWindow xw;
 491 static Term term;
 492 static CSIEscape csiescseq;
 493 static STREscape strescseq;
 494 static int cmdfd;
 495 static pid_t pid;
 496 static Selection sel;
 497 static int iofd = STDOUT_FILENO;
 498 static char **opt_cmd = NULL;
 499 static char *opt_io = NULL;
 500 static char *opt_title = NULL;
 501 static char *opt_embed = NULL;
 502 static char *opt_class = NULL;
 503 static char *opt_font = NULL;
 504 static int oldbutton = 3; /* button event on startup: 3 = release */
 505
 506 static char *usedfont = NULL;
 507 static double usedfontsize = 0;
 508 static double defaultfontsize = 0;
 509
 510 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 511 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 512 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 513 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 514
 515 /* Font Ring Cache */
 516 enum {
 517         FRC_NORMAL,
 518         FRC_ITALIC,
 519         FRC_BOLD,
 520         FRC_ITALICBOLD
 521 };
 522
 523 typedef struct {
 524         XftFont *font;
 525         int flags;
 526 } Fontcache;
 527
 528 /* Fontcache is an array now. A new font will be appended to the array. */
 529 static Fontcache frc[16];
 530 static int frclen = 0;
 531
 532 ssize_t
 533 xwrite(int fd, const char *s, size_t len) {
 534         size_t aux = len;
 535
 536         while(len > 0) {
 537                 ssize_t r = write(fd, s, len);
 538                 if(r < 0)
 539                         return r;
 540                 len -= r;
 541                 s += r;
 542         }
 543         return aux;
 544 }
 545
 546 void *
 547 xmalloc(size_t len) {
 548         void *p = malloc(len);
 549
 550         if(!p)
 551                 die("Out of memory\n");
 552
 553         return p;
 554 }
 555
 556 void *
 557 xrealloc(void *p, size_t len) {
 558         if((p = realloc(p, len)) == NULL)
 559                 die("Out of memory\n");
 560
 561         return p;
 562 }
 563
 564 char *
 565 xstrdup(char *s) {
 566         if((s = strdup(s)) == NULL)
 567                 die("Out of memory\n");
 568
 569         return s;
 570 }
 571
 572 size_t
 573 utf8decode(char *c, long *u, size_t clen) {
 574         size_t i, j, len, type;
 575         long udecoded;
 576
 577         *u = UTF_INVALID;
 578         if(!clen)
 579                 return 0;
 580         udecoded = utf8decodebyte(c[0], &len);
 581         if(!BETWEEN(len, 1, UTF_SIZ))
 582                 return 1;
 583         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 584                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 585                 if(type != 0)
 586                         return j;
 587         }
 588         if(j < len)
 589                 return 0;
 590         *u = udecoded;
 591         utf8validate(u, len);
 592         return len;
 593 }
 594
 595 long
 596 utf8decodebyte(char c, size_t *i) {
 597         for(*i = 0; *i < LEN(utfmask); ++(*i))
 598                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 599                         return (uchar)c & ~utfmask[*i];
 600         return 0;
 601 }
 602
 603 size_t
 604 utf8encode(long u, char *c, size_t clen) {
 605         size_t len, i;
 606
 607         len = utf8validate(&u, 0);
 608         if(clen < len)
 609                 return 0;
 610         for(i = len - 1; i != 0; --i) {
 611                 c[i] = utf8encodebyte(u, 0);
 612                 u >>= 6;
 613         }
 614         c[0] = utf8encodebyte(u, len);
 615         return len;
 616 }
 617
 618 char
 619 utf8encodebyte(long u, size_t i) {
 620         return utfbyte[i] | (u & ~utfmask[i]);
 621 }
 622
 623 size_t
 624 utf8len(char *c) {
 625         return utf8decode(c, &(long){0}, UTF_SIZ);
 626 }
 627
 628 size_t
 629 utf8validate(long *u, size_t i) {
 630         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 631                 *u = UTF_INVALID;
 632         for(i = 1; *u > utfmax[i]; ++i)
 633                 ;
 634         return i;
 635 }
 636
 637 static void
 638 selinit(void) {
 639         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 640         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 641         sel.mode = 0;
 642         sel.ob.x = -1;
 643         sel.clip = NULL;
 644         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 645         if(sel.xtarget == None)
 646                 sel.xtarget = XA_STRING;
 647 }
 648
 649 static int
 650 x2col(int x) {
 651         x -= borderpx;
 652         x /= xw.cw;
 653
 654         return LIMIT(x, 0, term.col-1);
 655 }
 656
 657 static int
 658 y2row(int y) {
 659         y -= borderpx;
 660         y /= xw.ch;
 661
 662         return LIMIT(y, 0, term.row-1);
 663 }
 664
 665 static int tlinelen(int y) {
 666         int i = term.col;
 667
 668         if(term.line[y][i - 1].mode & ATTR_WRAP)
 669                 return i;
 670
 671         while(i > 0 && term.line[y][i - 1].c[0] == ' ')
 672                 --i;
 673
 674         return i;
 675 }
 676
 677 static void
 678 selnormalize(void) {
 679         int i;
 680
 681         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 682                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 683                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 684         } else {
 685                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 686                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 687         }
 688         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 689         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 690
 691         selsnap(sel.snap, &sel.nb.x, &sel.nb.y, -1);
 692         selsnap(sel.snap, &sel.ne.x, &sel.ne.y, +1);
 693
 694         /* expand selection over line breaks */
 695         if (sel.type == SEL_RECTANGULAR)
 696                 return;
 697         i = tlinelen(sel.nb.y);
 698         if (i < sel.nb.x)
 699                 sel.nb.x = i;
 700         if (tlinelen(sel.ne.y) <= sel.ne.x)
 701                 sel.ne.x = term.col - 1;
 702 }
 703
 704 static inline bool
 705 selected(int x, int y) {
 706         if(sel.type == SEL_RECTANGULAR)
 707                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 708                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 709
 710         return BETWEEN(y, sel.nb.y, sel.ne.y)
 711             && (y != sel.nb.y || x >= sel.nb.x)
 712             && (y != sel.ne.y || x <= sel.ne.x);
 713 }
 714
 715 void
 716 selsnap(int mode, int *x, int *y, int direction) {
 717         int newx, newy, xt, yt;
 718         bool delim, prevdelim;
 719         Glyph *gp, *prevgp;
 720
 721         switch(mode) {
 722         case SNAP_WORD:
 723                 /*
 724                  * Snap around if the word wraps around at the end or
 725                  * beginning of a line.
 726                  */
 727                 prevgp = &term.line[*y][*x];
 728                 prevdelim = strchr(worddelimiters, prevgp->c[0]) != NULL;
 729                 for(;;) {
 730                         newx = *x + direction;
 731                         newy = *y;
 732                         if(!BETWEEN(newx, 0, term.col - 1)) {
 733                                 newy += direction;
 734                                 newx = (newx + term.col) % term.col;
 735                                 if (!BETWEEN(newy, 0, term.row - 1))
 736                                         break;
 737
 738                                 if(direction > 0)
 739                                         yt = *y, xt = *x;
 740                                 else
 741                                         yt = newy, xt = newx;
 742                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 743                                         break;
 744                         }
 745
 746                         if (newx >= tlinelen(newy))
 747                                 break;
 748
 749                         gp = &term.line[newy][newx];
 750                         delim = strchr(worddelimiters, gp->c[0]) != NULL;
 751                         if(!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
 752                                         || (delim && gp->c[0] != prevgp->c[0])))
 753                                 break;
 754
 755                         *x = newx;
 756                         *y = newy;
 757                         prevgp = gp;
 758                         prevdelim = delim;
 759                 }
 760                 break;
 761         case SNAP_LINE:
 762                 /*
 763                  * Snap around if the the previous line or the current one
 764                  * has set ATTR_WRAP at its end. Then the whole next or
 765                  * previous line will be selected.
 766                  */
 767                 *x = (direction < 0) ? 0 : term.col - 1;
 768                 if(direction < 0 && *y > 0) {
 769                         for(; *y > 0; *y += direction) {
 770                                 if(!(term.line[*y-1][term.col-1].mode
 771                                                 & ATTR_WRAP)) {
 772                                         break;
 773                                 }
 774                         }
 775                 } else if(direction > 0 && *y < term.row-1) {
 776                         for(; *y < term.row; *y += direction) {
 777                                 if(!(term.line[*y][term.col-1].mode
 778                                                 & ATTR_WRAP)) {
 779                                         break;
 780                                 }
 781                         }
 782                 }
 783                 break;
 784         }
 785 }
 786
 787 void
 788 getbuttoninfo(XEvent *e) {
 789         int type;
 790         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 791
 792         sel.alt = IS_SET(MODE_ALTSCREEN);
 793
 794         sel.oe.x = x2col(e->xbutton.x);
 795         sel.oe.y = y2row(e->xbutton.y);
 796         selnormalize();
 797
 798         sel.type = SEL_REGULAR;
 799         for(type = 1; type < LEN(selmasks); ++type) {
 800                 if(match(selmasks[type], state)) {
 801                         sel.type = type;
 802                         break;
 803                 }
 804         }
 805 }
 806
 807 void
 808 mousereport(XEvent *e) {
 809         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 810             button = e->xbutton.button, state = e->xbutton.state,
 811             len;
 812         char buf[40];
 813         static int ox, oy;
 814
 815         /* from urxvt */
 816         if(e->xbutton.type == MotionNotify) {
 817                 if(x == ox && y == oy)
 818                         return;
 819                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 820                         return;
 821                 /* MOUSE_MOTION: no reporting if no button is pressed */
 822                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 823                         return;
 824
 825                 button = oldbutton + 32;
 826                 ox = x;
 827                 oy = y;
 828         } else {
 829                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 830                         button = 3;
 831                 } else {
 832                         button -= Button1;
 833                         if(button >= 3)
 834                                 button += 64 - 3;
 835                 }
 836                 if(e->xbutton.type == ButtonPress) {
 837                         oldbutton = button;
 838                         ox = x;
 839                         oy = y;
 840                 } else if(e->xbutton.type == ButtonRelease) {
 841                         oldbutton = 3;
 842                         /* MODE_MOUSEX10: no button release reporting */
 843                         if(IS_SET(MODE_MOUSEX10))
 844                                 return;
 845                         if (button == 64 || button == 65)
 846                                 return;
 847                 }
 848         }
 849
 850         if(!IS_SET(MODE_MOUSEX10)) {
 851                 button += (state & ShiftMask   ? 4  : 0)
 852                         + (state & Mod4Mask    ? 8  : 0)
 853                         + (state & ControlMask ? 16 : 0);
 854         }
 855
 856         len = 0;
 857         if(IS_SET(MODE_MOUSESGR)) {
 858                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 859                                 button, x+1, y+1,
 860                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 861         } else if(x < 223 && y < 223) {
 862                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 863                                 32+button, 32+x+1, 32+y+1);
 864         } else {
 865                 return;
 866         }
 867
 868         ttywrite(buf, len);
 869 }
 870
 871 void
 872 bpress(XEvent *e) {
 873         struct timespec now;
 874         Mousekey *mk;
 875
 876         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 877                 mousereport(e);
 878                 return;
 879         }
 880
 881         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 882                 if(e->xbutton.button == mk->b
 883                                 && match(mk->mask, e->xbutton.state)) {
 884                         ttysend(mk->s, strlen(mk->s));
 885                         return;
 886                 }
 887         }
 888
 889         if(e->xbutton.button == Button1) {
 890                 clock_gettime(CLOCK_MONOTONIC, &now);
 891
 892                 /* Clear previous selection, logically and visually. */
 893                 selclear(NULL);
 894                 sel.mode = 1;
 895                 sel.type = SEL_REGULAR;
 896                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 897                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 898
 899                 /*
 900                  * If the user clicks below predefined timeouts specific
 901                  * snapping behaviour is exposed.
 902                  */
 903                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 904                         sel.snap = SNAP_LINE;
 905                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 906                         sel.snap = SNAP_WORD;
 907                 } else {
 908                         sel.snap = 0;
 909                 }
 910                 selnormalize();
 911
 912                 /*
 913                  * Draw selection, unless it's regular and we don't want to
 914                  * make clicks visible
 915                  */
 916                 if(sel.snap != 0) {
 917                         sel.mode++;
 918                         tsetdirt(sel.nb.y, sel.ne.y);
 919                 }
 920                 sel.tclick2 = sel.tclick1;
 921                 sel.tclick1 = now;
 922         }
 923 }
 924
 925 char *
 926 getsel(void) {
 927         char *str, *ptr;
 928         int y, bufsize, size, lastx, linelen;
 929         Glyph *gp, *last;
 930
 931         if(sel.ob.x == -1)
 932                 return NULL;
 933
 934         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 935         ptr = str = xmalloc(bufsize);
 936
 937         /* append every set & selected glyph to the selection */
 938         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 939                 linelen = tlinelen(y);
 940
 941                 if(sel.type == SEL_RECTANGULAR) {
 942                         gp = &term.line[y][sel.nb.x];
 943                         lastx = sel.ne.x;
 944                 } else {
 945                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 946                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 947                 }
 948                 last = &term.line[y][MIN(lastx, linelen-1)];
 949
 950                 for( ; gp <= last; ++gp) {
 951                         if(gp->mode & ATTR_WDUMMY)
 952                                 continue;
 953
 954                         size = utf8len(gp->c);
 955                         memcpy(ptr, gp->c, size);
 956                         ptr += size;
 957                 }
 958
 959                 /*
 960                  * Copy and pasting of line endings is inconsistent
 961                  * in the inconsistent terminal and GUI world.
 962                  * The best solution seems like to produce '\n' when
 963                  * something is copied from st and convert '\n' to
 964                  * '\r', when something to be pasted is received by
 965                  * st.
 966                  * FIXME: Fix the computer world.
 967                  */
 968                 if((y < sel.ne.y || lastx >= linelen) && !(last->mode & ATTR_WRAP))
 969                         *ptr++ = '\n';
 970         }
 971         *ptr = 0;
 972         return str;
 973 }
 974
 975 void
 976 selcopy(void) {
 977         xsetsel(getsel());
 978 }
 979
 980 void
 981 selnotify(XEvent *e) {
 982         ulong nitems, ofs, rem;
 983         int format;
 984         uchar *data, *last, *repl;
 985         Atom type;
 986
 987         ofs = 0;
 988         do {
 989                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 990                                         False, AnyPropertyType, &type, &format,
 991                                         &nitems, &rem, &data)) {
 992                         fprintf(stderr, "Clipboard allocation failed\n");
 993                         return;
 994                 }
 995
 996                 /*
 997                  * As seen in getsel:
 998                  * Line endings are inconsistent in the terminal and GUI world
 999                  * copy and pasting. When receiving some selection data,
1000                  * replace all '\n' with '\r'.
1001                  * FIXME: Fix the computer world.
1002                  */
1003                 repl = data;
1004                 last = data + nitems * format / 8;
1005                 while((repl = memchr(repl, '\n', last - repl))) {
1006                         *repl++ = '\r';
1007                 }
1008
1009                 if(IS_SET(MODE_BRCKTPASTE))
1010                         ttywrite("\033[200~", 6);
1011                 ttysend((char *)data, nitems * format / 8);
1012                 if(IS_SET(MODE_BRCKTPASTE))
1013                         ttywrite("\033[201~", 6);
1014                 XFree(data);
1015                 /* number of 32-bit chunks returned */
1016                 ofs += nitems * format / 32;
1017         } while(rem > 0);
1018 }
1019
1020 void
1021 selpaste(const Arg *dummy) {
1022         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1023                         xw.win, CurrentTime);
1024 }
1025
1026 void
1027 clippaste(const Arg *dummy) {
1028         Atom clipboard;
1029
1030         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1031         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1032                         xw.win, CurrentTime);
1033 }
1034
1035 void
1036 selclear(XEvent *e) {
1037         if(sel.ob.x == -1)
1038                 return;
1039         sel.ob.x = -1;
1040         tsetdirt(sel.nb.y, sel.ne.y);
1041 }
1042
1043 void
1044 selrequest(XEvent *e) {
1045         XSelectionRequestEvent *xsre;
1046         XSelectionEvent xev;
1047         Atom xa_targets, string;
1048
1049         xsre = (XSelectionRequestEvent *) e;
1050         xev.type = SelectionNotify;
1051         xev.requestor = xsre->requestor;
1052         xev.selection = xsre->selection;
1053         xev.target = xsre->target;
1054         xev.time = xsre->time;
1055         /* reject */
1056         xev.property = None;
1057
1058         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1059         if(xsre->target == xa_targets) {
1060                 /* respond with the supported type */
1061                 string = sel.xtarget;
1062                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1063                                 XA_ATOM, 32, PropModeReplace,
1064                                 (uchar *) &string, 1);
1065                 xev.property = xsre->property;
1066         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1067                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1068                                 xsre->target, 8, PropModeReplace,
1069                                 (uchar *) sel.clip, strlen(sel.clip));
1070                 xev.property = xsre->property;
1071         }
1072
1073         /* all done, send a notification to the listener */
1074         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1075                 fprintf(stderr, "Error sending SelectionNotify event\n");
1076 }
1077
1078 void
1079 xsetsel(char *str) {
1080         /* register the selection for both the clipboard and the primary */
1081         Atom clipboard;
1082
1083         free(sel.clip);
1084         sel.clip = str;
1085
1086         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1087
1088         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1089         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1090 }
1091
1092 void
1093 brelease(XEvent *e) {
1094         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1095                 mousereport(e);
1096                 return;
1097         }
1098
1099         if(e->xbutton.button == Button2) {
1100                 selpaste(NULL);
1101         } else if(e->xbutton.button == Button1) {
1102                 if(sel.mode < 2) {
1103                         selclear(NULL);
1104                 } else {
1105                         getbuttoninfo(e);
1106                         selcopy();
1107                 }
1108                 sel.mode = 0;
1109                 tsetdirt(sel.nb.y, sel.ne.y);
1110         }
1111 }
1112
1113 void
1114 bmotion(XEvent *e) {
1115         int oldey, oldex, oldsby, oldsey;
1116
1117         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1118                 mousereport(e);
1119                 return;
1120         }
1121
1122         if(!sel.mode)
1123                 return;
1124
1125         sel.mode++;
1126         oldey = sel.oe.y;
1127         oldex = sel.oe.x;
1128         oldsby = sel.nb.y;
1129         oldsey = sel.ne.y;
1130         getbuttoninfo(e);
1131
1132         if(oldey != sel.oe.y || oldex != sel.oe.x)
1133                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1134 }
1135
1136 void
1137 die(const char *errstr, ...) {
1138         va_list ap;
1139
1140         va_start(ap, errstr);
1141         vfprintf(stderr, errstr, ap);
1142         va_end(ap);
1143         exit(EXIT_FAILURE);
1144 }
1145
1146 void
1147 execsh(void) {
1148         char **args, *sh;
1149         const struct passwd *pw;
1150         char buf[sizeof(long) * 8 + 1];
1151
1152         errno = 0;
1153         if((pw = getpwuid(getuid())) == NULL) {
1154                 if(errno)
1155                         die("getpwuid:%s\n", strerror(errno));
1156                 else
1157                         die("who are you?\n");
1158         }
1159
1160         if (utmp)
1161                 sh = utmp;
1162         else if (pw->pw_shell[0])
1163                 sh = pw->pw_shell;
1164         else
1165                 sh = shell;
1166         args = (opt_cmd) ? opt_cmd : (char *[]){sh, NULL};
1167         snprintf(buf, sizeof(buf), "%lu", xw.win);
1168
1169         unsetenv("COLUMNS");
1170         unsetenv("LINES");
1171         unsetenv("TERMCAP");
1172         setenv("LOGNAME", pw->pw_name, 1);
1173         setenv("USER", pw->pw_name, 1);
1174         setenv("SHELL", args[0], 1);
1175         setenv("HOME", pw->pw_dir, 1);
1176         setenv("TERM", termname, 1);
1177         setenv("WINDOWID", buf, 1);
1178
1179         signal(SIGCHLD, SIG_DFL);
1180         signal(SIGHUP, SIG_DFL);
1181         signal(SIGINT, SIG_DFL);
1182         signal(SIGQUIT, SIG_DFL);
1183         signal(SIGTERM, SIG_DFL);
1184         signal(SIGALRM, SIG_DFL);
1185
1186         execvp(args[0], args);
1187         exit(EXIT_FAILURE);
1188 }
1189
1190 void
1191 sigchld(int a) {
1192         int stat, ret;
1193
1194         if(waitpid(pid, &stat, 0) < 0)
1195                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1196
1197         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1198         if (ret != EXIT_SUCCESS)
1199                 die("child finished with error '%d'\n", stat);
1200         exit(EXIT_SUCCESS);
1201 }
1202
1203 void
1204 ttynew(void) {
1205         int m, s;
1206         struct winsize w = {term.row, term.col, 0, 0};
1207
1208         /* seems to work fine on linux, openbsd and freebsd */
1209         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1210                 die("openpty failed: %s\n", strerror(errno));
1211
1212         switch(pid = fork()) {
1213         case -1:
1214                 die("fork failed\n");
1215                 break;
1216         case 0:
1217                 setsid(); /* create a new process group */
1218                 dup2(s, STDIN_FILENO);
1219                 dup2(s, STDOUT_FILENO);
1220                 dup2(s, STDERR_FILENO);
1221                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1222                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1223                 close(s);
1224                 close(m);
1225                 execsh();
1226                 break;
1227         default:
1228                 close(s);
1229                 cmdfd = m;
1230                 signal(SIGCHLD, sigchld);
1231                 if(opt_io) {
1232                         term.mode |= MODE_PRINT;
1233                         iofd = (!strcmp(opt_io, "-")) ?
1234                                   STDOUT_FILENO :
1235                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1236                         if(iofd < 0) {
1237                                 fprintf(stderr, "Error opening %s:%s\n",
1238                                         opt_io, strerror(errno));
1239                         }
1240                 }
1241                 break;
1242         }
1243 }
1244
1245 void
1246 ttyread(void) {
1247         static char buf[BUFSIZ];
1248         static int buflen = 0;
1249         char *ptr;
1250         char s[UTF_SIZ];
1251         int charsize; /* size of utf8 char in bytes */
1252         long unicodep;
1253         int ret;
1254
1255         /* append read bytes to unprocessed bytes */
1256         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1257                 die("Couldn't read from shell: %s\n", strerror(errno));
1258
1259         /* process every complete utf8 char */
1260         buflen += ret;
1261         ptr = buf;
1262         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1263                 utf8encode(unicodep, s, UTF_SIZ);
1264                 tputc(s, charsize);
1265                 ptr += charsize;
1266                 buflen -= charsize;
1267         }
1268
1269         /* keep any uncomplete utf8 char for the next call */
1270         memmove(buf, ptr, buflen);
1271 }
1272
1273 void
1274 ttywrite(const char *s, size_t n) {
1275         if(xwrite(cmdfd, s, n) == -1)
1276                 die("write error on tty: %s\n", strerror(errno));
1277 }
1278
1279 void
1280 ttysend(char *s, size_t n) {
1281         ttywrite(s, n);
1282         if(IS_SET(MODE_ECHO))
1283                 techo(s, n);
1284 }
1285
1286 void
1287 ttyresize(void) {
1288         struct winsize w;
1289
1290         w.ws_row = term.row;
1291         w.ws_col = term.col;
1292         w.ws_xpixel = xw.tw;
1293         w.ws_ypixel = xw.th;
1294         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1295                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1296 }
1297
1298 int
1299 tattrset(int attr) {
1300         int i, j;
1301
1302         for(i = 0; i < term.row-1; i++) {
1303                 for(j = 0; j < term.col-1; j++) {
1304                         if(term.line[i][j].mode & attr)
1305                                 return 1;
1306                 }
1307         }
1308
1309         return 0;
1310 }
1311
1312 void
1313 tsetdirt(int top, int bot) {
1314         int i;
1315
1316         LIMIT(top, 0, term.row-1);
1317         LIMIT(bot, 0, term.row-1);
1318
1319         for(i = top; i <= bot; i++)
1320                 term.dirty[i] = 1;
1321 }
1322
1323 void
1324 tsetdirtattr(int attr) {
1325         int i, j;
1326
1327         for(i = 0; i < term.row-1; i++) {
1328                 for(j = 0; j < term.col-1; j++) {
1329                         if(term.line[i][j].mode & attr) {
1330                                 tsetdirt(i, i);
1331                                 break;
1332                         }
1333                 }
1334         }
1335 }
1336
1337 void
1338 tfulldirt(void) {
1339         tsetdirt(0, term.row-1);
1340 }
1341
1342 void
1343 tcursor(int mode) {
1344         static TCursor c[2];
1345         bool alt = IS_SET(MODE_ALTSCREEN);
1346
1347         if(mode == CURSOR_SAVE) {
1348                 c[alt] = term.c;
1349         } else if(mode == CURSOR_LOAD) {
1350                 term.c = c[alt];
1351                 tmoveto(c[alt].x, c[alt].y);
1352         }
1353 }
1354
1355 void
1356 treset(void) {
1357         uint i;
1358
1359         term.c = (TCursor){{
1360                 .mode = ATTR_NULL,
1361                 .fg = defaultfg,
1362                 .bg = defaultbg
1363         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1364
1365         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1366         for(i = tabspaces; i < term.col; i += tabspaces)
1367                 term.tabs[i] = 1;
1368         term.top = 0;
1369         term.bot = term.row - 1;
1370         term.mode = MODE_WRAP;
1371         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1372         term.charset = 0;
1373
1374         for(i = 0; i < 2; i++) {
1375                 tmoveto(0, 0);
1376                 tcursor(CURSOR_SAVE);
1377                 tclearregion(0, 0, term.col-1, term.row-1);
1378                 tswapscreen();
1379         }
1380 }
1381
1382 void
1383 tnew(int col, int row) {
1384         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1385         tresize(col, row);
1386         term.numlock = 1;
1387
1388         treset();
1389 }
1390
1391 void
1392 tswapscreen(void) {
1393         Line *tmp = term.line;
1394
1395         term.line = term.alt;
1396         term.alt = tmp;
1397         term.mode ^= MODE_ALTSCREEN;
1398         tfulldirt();
1399 }
1400
1401 void
1402 tscrolldown(int orig, int n) {
1403         int i;
1404         Line temp;
1405
1406         LIMIT(n, 0, term.bot-orig+1);
1407
1408         tsetdirt(orig, term.bot-n);
1409         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1410
1411         for(i = term.bot; i >= orig+n; i--) {
1412                 temp = term.line[i];
1413                 term.line[i] = term.line[i-n];
1414                 term.line[i-n] = temp;
1415         }
1416
1417         selscroll(orig, n);
1418 }
1419
1420 void
1421 tscrollup(int orig, int n) {
1422         int i;
1423         Line temp;
1424
1425         LIMIT(n, 0, term.bot-orig+1);
1426
1427         tclearregion(0, orig, term.col-1, orig+n-1);
1428         tsetdirt(orig+n, term.bot);
1429
1430         for(i = orig; i <= term.bot-n; i++) {
1431                 temp = term.line[i];
1432                 term.line[i] = term.line[i+n];
1433                 term.line[i+n] = temp;
1434         }
1435
1436         selscroll(orig, -n);
1437 }
1438
1439 void
1440 selscroll(int orig, int n) {
1441         if(sel.ob.x == -1)
1442                 return;
1443
1444         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1445                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1446                         selclear(NULL);
1447                         return;
1448                 }
1449                 if(sel.type == SEL_RECTANGULAR) {
1450                         if(sel.ob.y < term.top)
1451                                 sel.ob.y = term.top;
1452                         if(sel.oe.y > term.bot)
1453                                 sel.oe.y = term.bot;
1454                 } else {
1455                         if(sel.ob.y < term.top) {
1456                                 sel.ob.y = term.top;
1457                                 sel.ob.x = 0;
1458                         }
1459                         if(sel.oe.y > term.bot) {
1460                                 sel.oe.y = term.bot;
1461                                 sel.oe.x = term.col;
1462                         }
1463                 }
1464                 selnormalize();
1465         }
1466 }
1467
1468 void
1469 tnewline(int first_col) {
1470         int y = term.c.y;
1471
1472         if(y == term.bot) {
1473                 tscrollup(term.top, 1);
1474         } else {
1475                 y++;
1476         }
1477         tmoveto(first_col ? 0 : term.c.x, y);
1478 }
1479
1480 void
1481 csiparse(void) {
1482         char *p = csiescseq.buf, *np;
1483         long int v;
1484
1485         csiescseq.narg = 0;
1486         if(*p == '?') {
1487                 csiescseq.priv = 1;
1488                 p++;
1489         }
1490
1491         csiescseq.buf[csiescseq.len] = '\0';
1492         while(p < csiescseq.buf+csiescseq.len) {
1493                 np = NULL;
1494                 v = strtol(p, &np, 10);
1495                 if(np == p)
1496                         v = 0;
1497                 if(v == LONG_MAX || v == LONG_MIN)
1498                         v = -1;
1499                 csiescseq.arg[csiescseq.narg++] = v;
1500                 p = np;
1501                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1502                         break;
1503                 p++;
1504         }
1505         csiescseq.mode = *p;
1506 }
1507
1508 /* for absolute user moves, when decom is set */
1509 void
1510 tmoveato(int x, int y) {
1511         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1512 }
1513
1514 void
1515 tmoveto(int x, int y) {
1516         int miny, maxy;
1517
1518         if(term.c.state & CURSOR_ORIGIN) {
1519                 miny = term.top;
1520                 maxy = term.bot;
1521         } else {
1522                 miny = 0;
1523                 maxy = term.row - 1;
1524         }
1525         LIMIT(x, 0, term.col-1);
1526         LIMIT(y, miny, maxy);
1527         term.c.state &= ~CURSOR_WRAPNEXT;
1528         term.c.x = x;
1529         term.c.y = y;
1530 }
1531
1532 void
1533 tsetchar(char *c, Glyph *attr, int x, int y) {
1534         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1535                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1536                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1537                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1538                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1539                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1540                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1541                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1542                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1543         };
1544
1545         /*
1546          * The table is proudly stolen from rxvt.
1547          */
1548         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1549                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1550                         c = vt100_0[c[0] - 0x41];
1551                 }
1552         }
1553
1554         if(term.line[y][x].mode & ATTR_WIDE) {
1555                 if(x+1 < term.col) {
1556                         term.line[y][x+1].c[0] = ' ';
1557                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1558                 }
1559         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1560                 term.line[y][x-1].c[0] = ' ';
1561                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1562         }
1563
1564         term.dirty[y] = 1;
1565         term.line[y][x] = *attr;
1566         memcpy(term.line[y][x].c, c, UTF_SIZ);
1567 }
1568
1569 void
1570 tclearregion(int x1, int y1, int x2, int y2) {
1571         int x, y, temp;
1572         Glyph *gp;
1573
1574         if(x1 > x2)
1575                 temp = x1, x1 = x2, x2 = temp;
1576         if(y1 > y2)
1577                 temp = y1, y1 = y2, y2 = temp;
1578
1579         LIMIT(x1, 0, term.col-1);
1580         LIMIT(x2, 0, term.col-1);
1581         LIMIT(y1, 0, term.row-1);
1582         LIMIT(y2, 0, term.row-1);
1583
1584         for(y = y1; y <= y2; y++) {
1585                 term.dirty[y] = 1;
1586                 for(x = x1; x <= x2; x++) {
1587                         gp = &term.line[y][x];
1588                         if(selected(x, y))
1589                                 selclear(NULL);
1590                         gp->fg = term.c.attr.fg;
1591                         gp->bg = term.c.attr.bg;
1592                         gp->mode = 0;
1593                         memcpy(gp->c, " ", 2);
1594                 }
1595         }
1596 }
1597
1598 void
1599 tdeletechar(int n) {
1600         int dst, src, size;
1601         Glyph *line;
1602
1603         LIMIT(n, 0, term.col - term.c.x);
1604
1605         dst = term.c.x;
1606         src = term.c.x + n;
1607         size = term.col - src;
1608         line = term.line[term.c.y];
1609
1610         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1611         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1612 }
1613
1614 void
1615 tinsertblank(int n) {
1616         int dst, src, size;
1617         Glyph *line;
1618
1619         LIMIT(n, 0, term.col - term.c.x);
1620
1621         dst = term.c.x + n;
1622         src = term.c.x;
1623         size = term.col - dst;
1624         line = term.line[term.c.y];
1625
1626         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1627         tclearregion(src, term.c.y, dst - 1, term.c.y);
1628 }
1629
1630 void
1631 tinsertblankline(int n) {
1632         if(BETWEEN(term.c.y, term.top, term.bot))
1633                 tscrolldown(term.c.y, n);
1634 }
1635
1636 void
1637 tdeleteline(int n) {
1638         if(BETWEEN(term.c.y, term.top, term.bot))
1639                 tscrollup(term.c.y, n);
1640 }
1641
1642 int32_t
1643 tdefcolor(int *attr, int *npar, int l) {
1644         int32_t idx = -1;
1645         uint r, g, b;
1646
1647         switch (attr[*npar + 1]) {
1648         case 2: /* direct color in RGB space */
1649                 if (*npar + 4 >= l) {
1650                         fprintf(stderr,
1651                                 "erresc(38): Incorrect number of parameters (%d)\n",
1652                                 *npar);
1653                         break;
1654                 }
1655                 r = attr[*npar + 2];
1656                 g = attr[*npar + 3];
1657                 b = attr[*npar + 4];
1658                 *npar += 4;
1659                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1660                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1661                                 r, g, b);
1662                 else
1663                         idx = TRUECOLOR(r, g, b);
1664                 break;
1665         case 5: /* indexed color */
1666                 if (*npar + 2 >= l) {
1667                         fprintf(stderr,
1668                                 "erresc(38): Incorrect number of parameters (%d)\n",
1669                                 *npar);
1670                         break;
1671                 }
1672                 *npar += 2;
1673                 if(!BETWEEN(attr[*npar], 0, 255))
1674                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1675                 else
1676                         idx = attr[*npar];
1677                 break;
1678         case 0: /* implemented defined (only foreground) */
1679         case 1: /* transparent */
1680         case 3: /* direct color in CMY space */
1681         case 4: /* direct color in CMYK space */
1682         default:
1683                 fprintf(stderr,
1684                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1685                 break;
1686         }
1687
1688         return idx;
1689 }
1690
1691 void
1692 tsetattr(int *attr, int l) {
1693         int i;
1694         int32_t idx;
1695
1696         for(i = 0; i < l; i++) {
1697                 switch(attr[i]) {
1698                 case 0:
1699                         term.c.attr.mode &= ~(
1700                                 ATTR_BOLD       |
1701                                 ATTR_FAINT      |
1702                                 ATTR_ITALIC     |
1703                                 ATTR_UNDERLINE  |
1704                                 ATTR_BLINK      |
1705                                 ATTR_REVERSE    |
1706                                 ATTR_INVISIBLE  |
1707                                 ATTR_STRUCK     );
1708                         term.c.attr.fg = defaultfg;
1709                         term.c.attr.bg = defaultbg;
1710                         break;
1711                 case 1:
1712                         term.c.attr.mode |= ATTR_BOLD;
1713                         break;
1714                 case 2:
1715                         term.c.attr.mode |= ATTR_FAINT;
1716                         break;
1717                 case 3:
1718                         term.c.attr.mode |= ATTR_ITALIC;
1719                         break;
1720                 case 4:
1721                         term.c.attr.mode |= ATTR_UNDERLINE;
1722                         break;
1723                 case 5: /* slow blink */
1724                         /* FALLTHROUGH */
1725                 case 6: /* rapid blink */
1726                         term.c.attr.mode |= ATTR_BLINK;
1727                         break;
1728                 case 7:
1729                         term.c.attr.mode |= ATTR_REVERSE;
1730                         break;
1731                 case 8:
1732                         term.c.attr.mode |= ATTR_INVISIBLE;
1733                         break;
1734                 case 9:
1735                         term.c.attr.mode |= ATTR_STRUCK;
1736                         break;
1737                 case 22:
1738                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1739                         break;
1740                 case 23:
1741                         term.c.attr.mode &= ~ATTR_ITALIC;
1742                         break;
1743                 case 24:
1744                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1745                         break;
1746                 case 25:
1747                         term.c.attr.mode &= ~ATTR_BLINK;
1748                         break;
1749                 case 27:
1750                         term.c.attr.mode &= ~ATTR_REVERSE;
1751                         break;
1752                 case 28:
1753                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1754                         break;
1755                 case 29:
1756                         term.c.attr.mode &= ~ATTR_STRUCK;
1757                         break;
1758                 case 38:
1759                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1760                                 term.c.attr.fg = idx;
1761                         break;
1762                 case 39:
1763                         term.c.attr.fg = defaultfg;
1764                         break;
1765                 case 48:
1766                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1767                                 term.c.attr.bg = idx;
1768                         break;
1769                 case 49:
1770                         term.c.attr.bg = defaultbg;
1771                         break;
1772                 default:
1773                         if(BETWEEN(attr[i], 30, 37)) {
1774                                 term.c.attr.fg = attr[i] - 30;
1775                         } else if(BETWEEN(attr[i], 40, 47)) {
1776                                 term.c.attr.bg = attr[i] - 40;
1777                         } else if(BETWEEN(attr[i], 90, 97)) {
1778                                 term.c.attr.fg = attr[i] - 90 + 8;
1779                         } else if(BETWEEN(attr[i], 100, 107)) {
1780                                 term.c.attr.bg = attr[i] - 100 + 8;
1781                         } else {
1782                                 fprintf(stderr,
1783                                         "erresc(default): gfx attr %d unknown\n",
1784                                         attr[i]), csidump();
1785                         }
1786                         break;
1787                 }
1788         }
1789 }
1790
1791 void
1792 tsetscroll(int t, int b) {
1793         int temp;
1794
1795         LIMIT(t, 0, term.row-1);
1796         LIMIT(b, 0, term.row-1);
1797         if(t > b) {
1798                 temp = t;
1799                 t = b;
1800                 b = temp;
1801         }
1802         term.top = t;
1803         term.bot = b;
1804 }
1805
1806 void
1807 tsetmode(bool priv, bool set, int *args, int narg) {
1808         int *lim, mode;
1809         bool alt;
1810
1811         for(lim = args + narg; args < lim; ++args) {
1812                 if(priv) {
1813                         switch(*args) {
1814                         case 1: /* DECCKM -- Cursor key */
1815                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1816                                 break;
1817                         case 5: /* DECSCNM -- Reverse video */
1818                                 mode = term.mode;
1819                                 MODBIT(term.mode, set, MODE_REVERSE);
1820                                 if(mode != term.mode)
1821                                         redraw(REDRAW_TIMEOUT);
1822                                 break;
1823                         case 6: /* DECOM -- Origin */
1824                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1825                                 tmoveato(0, 0);
1826                                 break;
1827                         case 7: /* DECAWM -- Auto wrap */
1828                                 MODBIT(term.mode, set, MODE_WRAP);
1829                                 break;
1830                         case 0:  /* Error (IGNORED) */
1831                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1832                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1833                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1834                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1835                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1836                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1837                         case 42: /* DECNRCM -- National characters (IGNORED) */
1838                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1839                                 break;
1840                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1841                                 MODBIT(term.mode, !set, MODE_HIDE);
1842                                 break;
1843                         case 9:    /* X10 mouse compatibility mode */
1844                                 xsetpointermotion(0);
1845                                 MODBIT(term.mode, 0, MODE_MOUSE);
1846                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1847                                 break;
1848                         case 1000: /* 1000: report button press */
1849                                 xsetpointermotion(0);
1850                                 MODBIT(term.mode, 0, MODE_MOUSE);
1851                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1852                                 break;
1853                         case 1002: /* 1002: report motion on button press */
1854                                 xsetpointermotion(0);
1855                                 MODBIT(term.mode, 0, MODE_MOUSE);
1856                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1857                                 break;
1858                         case 1003: /* 1003: enable all mouse motions */
1859                                 xsetpointermotion(set);
1860                                 MODBIT(term.mode, 0, MODE_MOUSE);
1861                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1862                                 break;
1863                         case 1004: /* 1004: send focus events to tty */
1864                                 MODBIT(term.mode, set, MODE_FOCUS);
1865                                 break;
1866                         case 1006: /* 1006: extended reporting mode */
1867                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1868                                 break;
1869                         case 1034:
1870                                 MODBIT(term.mode, set, MODE_8BIT);
1871                                 break;
1872                         case 1049: /* swap screen & set/restore cursor as xterm */
1873                                 if (!allowaltscreen)
1874                                         break;
1875                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1876                                 /* FALLTHROUGH */
1877                         case 47: /* swap screen */
1878                         case 1047:
1879                                 if (!allowaltscreen)
1880                                         break;
1881                                 alt = IS_SET(MODE_ALTSCREEN);
1882                                 if(alt) {
1883                                         tclearregion(0, 0, term.col-1,
1884                                                         term.row-1);
1885                                 }
1886                                 if(set ^ alt) /* set is always 1 or 0 */
1887                                         tswapscreen();
1888                                 if(*args != 1049)
1889                                         break;
1890                                 /* FALLTHROUGH */
1891                         case 1048:
1892                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1893                                 break;
1894                         case 2004: /* 2004: bracketed paste mode */
1895                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1896                                 break;
1897                         /* Not implemented mouse modes. See comments there. */
1898                         case 1001: /* mouse highlight mode; can hang the
1899                                       terminal by design when implemented. */
1900                         case 1005: /* UTF-8 mouse mode; will confuse
1901                                       applications not supporting UTF-8
1902                                       and luit. */
1903                         case 1015: /* urxvt mangled mouse mode; incompatible
1904                                       and can be mistaken for other control
1905                                       codes. */
1906                         default:
1907                                 fprintf(stderr,
1908                                         "erresc: unknown private set/reset mode %d\n",
1909                                         *args);
1910                                 break;
1911                         }
1912                 } else {
1913                         switch(*args) {
1914                         case 0:  /* Error (IGNORED) */
1915                                 break;
1916                         case 2:  /* KAM -- keyboard action */
1917                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1918                                 break;
1919                         case 4:  /* IRM -- Insertion-replacement */
1920                                 MODBIT(term.mode, set, MODE_INSERT);
1921                                 break;
1922                         case 12: /* SRM -- Send/Receive */
1923                                 MODBIT(term.mode, !set, MODE_ECHO);
1924                                 break;
1925                         case 20: /* LNM -- Linefeed/new line */
1926                                 MODBIT(term.mode, set, MODE_CRLF);
1927                                 break;
1928                         default:
1929                                 fprintf(stderr,
1930                                         "erresc: unknown set/reset mode %d\n",
1931                                         *args);
1932                                 break;
1933                         }
1934                 }
1935         }
1936 }
1937
1938 void
1939 csihandle(void) {
1940         char buf[40];
1941         int len;
1942
1943         switch(csiescseq.mode) {
1944         default:
1945         unknown:
1946                 fprintf(stderr, "erresc: unknown csi ");
1947                 csidump();
1948                 /* die(""); */
1949                 break;
1950         case '@': /* ICH -- Insert <n> blank char */
1951                 DEFAULT(csiescseq.arg[0], 1);
1952                 tinsertblank(csiescseq.arg[0]);
1953                 break;
1954         case 'A': /* CUU -- Cursor <n> Up */
1955                 DEFAULT(csiescseq.arg[0], 1);
1956                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1957                 break;
1958         case 'B': /* CUD -- Cursor <n> Down */
1959         case 'e': /* VPR --Cursor <n> Down */
1960                 DEFAULT(csiescseq.arg[0], 1);
1961                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1962                 break;
1963         case 'i': /* MC -- Media Copy */
1964                 switch(csiescseq.arg[0]) {
1965                 case 0:
1966                         tdump();
1967                         break;
1968                 case 1:
1969                         tdumpline(term.c.y);
1970                         break;
1971                 case 2:
1972                         tdumpsel();
1973                         break;
1974                 case 4:
1975                         term.mode &= ~MODE_PRINT;
1976                         break;
1977                 case 5:
1978                         term.mode |= MODE_PRINT;
1979                         break;
1980                 }
1981                 break;
1982         case 'c': /* DA -- Device Attributes */
1983                 if(csiescseq.arg[0] == 0)
1984                         ttywrite(vtiden, sizeof(vtiden) - 1);
1985                 break;
1986         case 'C': /* CUF -- Cursor <n> Forward */
1987         case 'a': /* HPR -- Cursor <n> Forward */
1988                 DEFAULT(csiescseq.arg[0], 1);
1989                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1990                 break;
1991         case 'D': /* CUB -- Cursor <n> Backward */
1992                 DEFAULT(csiescseq.arg[0], 1);
1993                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1994                 break;
1995         case 'E': /* CNL -- Cursor <n> Down and first col */
1996                 DEFAULT(csiescseq.arg[0], 1);
1997                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1998                 break;
1999         case 'F': /* CPL -- Cursor <n> Up and first col */
2000                 DEFAULT(csiescseq.arg[0], 1);
2001                 tmoveto(0, term.c.y-csiescseq.arg[0]);
2002                 break;
2003         case 'g': /* TBC -- Tabulation clear */
2004                 switch(csiescseq.arg[0]) {
2005                 case 0: /* clear current tab stop */
2006                         term.tabs[term.c.x] = 0;
2007                         break;
2008                 case 3: /* clear all the tabs */
2009                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2010                         break;
2011                 default:
2012                         goto unknown;
2013                 }
2014                 break;
2015         case 'G': /* CHA -- Move to <col> */
2016         case '`': /* HPA */
2017                 DEFAULT(csiescseq.arg[0], 1);
2018                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2019                 break;
2020         case 'H': /* CUP -- Move to <row> <col> */
2021         case 'f': /* HVP */
2022                 DEFAULT(csiescseq.arg[0], 1);
2023                 DEFAULT(csiescseq.arg[1], 1);
2024                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2025                 break;
2026         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2027                 DEFAULT(csiescseq.arg[0], 1);
2028                 tputtab(csiescseq.arg[0]);
2029                 break;
2030         case 'J': /* ED -- Clear screen */
2031                 selclear(NULL);
2032                 switch(csiescseq.arg[0]) {
2033                 case 0: /* below */
2034                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2035                         if(term.c.y < term.row-1) {
2036                                 tclearregion(0, term.c.y+1, term.col-1,
2037                                                 term.row-1);
2038                         }
2039                         break;
2040                 case 1: /* above */
2041                         if(term.c.y > 1)
2042                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2043                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2044                         break;
2045                 case 2: /* all */
2046                         tclearregion(0, 0, term.col-1, term.row-1);
2047                         break;
2048                 default:
2049                         goto unknown;
2050                 }
2051                 break;
2052         case 'K': /* EL -- Clear line */
2053                 switch(csiescseq.arg[0]) {
2054                 case 0: /* right */
2055                         tclearregion(term.c.x, term.c.y, term.col-1,
2056                                         term.c.y);
2057                         break;
2058                 case 1: /* left */
2059                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2060                         break;
2061                 case 2: /* all */
2062                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2063                         break;
2064                 }
2065                 break;
2066         case 'S': /* SU -- Scroll <n> line up */
2067                 DEFAULT(csiescseq.arg[0], 1);
2068                 tscrollup(term.top, csiescseq.arg[0]);
2069                 break;
2070         case 'T': /* SD -- Scroll <n> line down */
2071                 DEFAULT(csiescseq.arg[0], 1);
2072                 tscrolldown(term.top, csiescseq.arg[0]);
2073                 break;
2074         case 'L': /* IL -- Insert <n> blank lines */
2075                 DEFAULT(csiescseq.arg[0], 1);
2076                 tinsertblankline(csiescseq.arg[0]);
2077                 break;
2078         case 'l': /* RM -- Reset Mode */
2079                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2080                 break;
2081         case 'M': /* DL -- Delete <n> lines */
2082                 DEFAULT(csiescseq.arg[0], 1);
2083                 tdeleteline(csiescseq.arg[0]);
2084                 break;
2085         case 'X': /* ECH -- Erase <n> char */
2086                 DEFAULT(csiescseq.arg[0], 1);
2087                 tclearregion(term.c.x, term.c.y,
2088                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2089                 break;
2090         case 'P': /* DCH -- Delete <n> char */
2091                 DEFAULT(csiescseq.arg[0], 1);
2092                 tdeletechar(csiescseq.arg[0]);
2093                 break;
2094         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2095                 DEFAULT(csiescseq.arg[0], 1);
2096                 tputtab(-csiescseq.arg[0]);
2097                 break;
2098         case 'd': /* VPA -- Move to <row> */
2099                 DEFAULT(csiescseq.arg[0], 1);
2100                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2101                 break;
2102         case 'h': /* SM -- Set terminal mode */
2103                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2104                 break;
2105         case 'm': /* SGR -- Terminal attribute (color) */
2106                 tsetattr(csiescseq.arg, csiescseq.narg);
2107                 break;
2108         case 'n': /* DSR – Device Status Report (cursor position) */
2109                 if (csiescseq.arg[0] == 6) {
2110                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2111                                         term.c.y+1, term.c.x+1);
2112                         ttywrite(buf, len);
2113                 }
2114                 break;
2115         case 'r': /* DECSTBM -- Set Scrolling Region */
2116                 if(csiescseq.priv) {
2117                         goto unknown;
2118                 } else {
2119                         DEFAULT(csiescseq.arg[0], 1);
2120                         DEFAULT(csiescseq.arg[1], term.row);
2121                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2122                         tmoveato(0, 0);
2123                 }
2124                 break;
2125         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2126                 tcursor(CURSOR_SAVE);
2127                 break;
2128         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2129                 tcursor(CURSOR_LOAD);
2130                 break;
2131         }
2132 }
2133
2134 void
2135 csidump(void) {
2136         int i;
2137         uint c;
2138
2139         printf("ESC[");
2140         for(i = 0; i < csiescseq.len; i++) {
2141                 c = csiescseq.buf[i] & 0xff;
2142                 if(isprint(c)) {
2143                         putchar(c);
2144                 } else if(c == '\n') {
2145                         printf("(\\n)");
2146                 } else if(c == '\r') {
2147                         printf("(\\r)");
2148                 } else if(c == 0x1b) {
2149                         printf("(\\e)");
2150                 } else {
2151                         printf("(%02x)", c);
2152                 }
2153         }
2154         putchar('\n');
2155 }
2156
2157 void
2158 csireset(void) {
2159         memset(&csiescseq, 0, sizeof(csiescseq));
2160 }
2161
2162 void
2163 strhandle(void) {
2164         char *p = NULL;
2165         int j, narg, par;
2166
2167         term.esc &= ~(ESC_STR_END|ESC_STR);
2168         strparse();
2169         narg = strescseq.narg;
2170         par = atoi(strescseq.args[0]);
2171
2172         switch(strescseq.type) {
2173         case ']': /* OSC -- Operating System Command */
2174                 switch(par) {
2175                 case 0:
2176                 case 1:
2177                 case 2:
2178                         if(narg > 1)
2179                                 xsettitle(strescseq.args[1]);
2180                         return;
2181                 case 4: /* color set */
2182                         if(narg < 3)
2183                                 break;
2184                         p = strescseq.args[2];
2185                         /* FALLTHROUGH */
2186                 case 104: /* color reset, here p = NULL */
2187                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2188                         if(xsetcolorname(j, p)) {
2189                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2190                         } else {
2191                                 /*
2192                                  * TODO if defaultbg color is changed, borders
2193                                  * are dirty
2194                                  */
2195                                 redraw(0);
2196                         }
2197                         return;
2198                 }
2199                 break;
2200         case 'k': /* old title set compatibility */
2201                 xsettitle(strescseq.args[0]);
2202                 return;
2203         case 'P': /* DCS -- Device Control String */
2204         case '_': /* APC -- Application Program Command */
2205         case '^': /* PM -- Privacy Message */
2206                 return;
2207         }
2208
2209         fprintf(stderr, "erresc: unknown str ");
2210         strdump();
2211 }
2212
2213 void
2214 strparse(void) {
2215         char *p = strescseq.buf;
2216
2217         strescseq.narg = 0;
2218         strescseq.buf[strescseq.len] = '\0';
2219         while(p && strescseq.narg < STR_ARG_SIZ)
2220                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2221 }
2222
2223 void
2224 strdump(void) {
2225         int i;
2226         uint c;
2227
2228         printf("ESC%c", strescseq.type);
2229         for(i = 0; i < strescseq.len; i++) {
2230                 c = strescseq.buf[i] & 0xff;
2231                 if(c == '\0') {
2232                         return;
2233                 } else if(isprint(c)) {
2234                         putchar(c);
2235                 } else if(c == '\n') {
2236                         printf("(\\n)");
2237                 } else if(c == '\r') {
2238                         printf("(\\r)");
2239                 } else if(c == 0x1b) {
2240                         printf("(\\e)");
2241                 } else {
2242                         printf("(%02x)", c);
2243                 }
2244         }
2245         printf("ESC\\\n");
2246 }
2247
2248 void
2249 strreset(void) {
2250         memset(&strescseq, 0, sizeof(strescseq));
2251 }
2252
2253 void
2254 tprinter(char *s, size_t len) {
2255         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2256                 fprintf(stderr, "Error writing in %s:%s\n",
2257                         opt_io, strerror(errno));
2258                 close(iofd);
2259                 iofd = -1;
2260         }
2261 }
2262
2263 void
2264 toggleprinter(const Arg *arg) {
2265         term.mode ^= MODE_PRINT;
2266 }
2267
2268 void
2269 printscreen(const Arg *arg) {
2270         tdump();
2271 }
2272
2273 void
2274 printsel(const Arg *arg) {
2275         tdumpsel();
2276 }
2277
2278 void
2279 tdumpsel(void) {
2280         char *ptr;
2281
2282         if((ptr = getsel())) {
2283                 tprinter(ptr, strlen(ptr));
2284                 free(ptr);
2285         }
2286 }
2287
2288 void
2289 tdumpline(int n) {
2290         Glyph *bp, *end;
2291
2292         bp = &term.line[n][0];
2293         end = &bp[MIN(tlinelen(n), term.col) - 1];
2294         if(bp != end || bp->c[0] != ' ') {
2295                 for( ;bp <= end; ++bp)
2296                         tprinter(bp->c, utf8len(bp->c));
2297         }
2298         tprinter("\n", 1);
2299 }
2300
2301 void
2302 tdump(void) {
2303         int i;
2304
2305         for(i = 0; i < term.row; ++i)
2306                 tdumpline(i);
2307 }
2308
2309 void
2310 tputtab(int n) {
2311         uint x = term.c.x;
2312
2313         if(n > 0) {
2314                 while(x < term.col && n--)
2315                         for(++x; x < term.col && !term.tabs[x]; ++x)
2316                                 /* nothing */ ;
2317         } else if(n < 0) {
2318                 while(x > 0 && n++)
2319                         for(--x; x > 0 && !term.tabs[x]; --x)
2320                                 /* nothing */ ;
2321         }
2322         tmoveto(x, term.c.y);
2323 }
2324
2325 void
2326 techo(char *buf, int len) {
2327         for(; len > 0; buf++, len--) {
2328                 char c = *buf;
2329
2330                 if(ISCONTROL((uchar) c)) { /* control code */
2331                         if(c & 0x80) {
2332                                 c &= 0x7f;
2333                                 tputc("^", 1);
2334                                 tputc("[", 1);
2335                         } else if(c != '\n' && c != '\r' && c != '\t') {
2336                                 c ^= 0x40;
2337                                 tputc("^", 1);
2338                         }
2339                         tputc(&c, 1);
2340                 } else {
2341                         break;
2342                 }
2343         }
2344         if(len)
2345                 tputc(buf, len);
2346 }
2347
2348 void
2349 tdeftran(char ascii) {
2350         static char cs[] = "0B";
2351         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2352         char *p;
2353
2354         if((p = strchr(cs, ascii)) == NULL) {
2355                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2356         } else {
2357                 term.trantbl[term.icharset] = vcs[p - cs];
2358         }
2359 }
2360
2361 void
2362 tdectest(char c) {
2363         static char E[UTF_SIZ] = "E";
2364         int x, y;
2365
2366         if(c == '8') { /* DEC screen alignment test. */
2367                 for(x = 0; x < term.col; ++x) {
2368                         for(y = 0; y < term.row; ++y)
2369                                 tsetchar(E, &term.c.attr, x, y);
2370                 }
2371         }
2372 }
2373
2374 void
2375 tstrsequence(uchar c) {
2376         if (c & 0x80) {
2377                 switch (c) {
2378                 case 0x90:   /* DCS -- Device Control String */
2379                         c = 'P';
2380                         break;
2381                 case 0x9f:   /* APC -- Application Program Command */
2382                         c = '_';
2383                         break;
2384                 case 0x9e:   /* PM -- Privacy Message */
2385                         c = '^';
2386                         break;
2387                 case 0x9d:   /* OSC -- Operating System Command */
2388                         c = ']';
2389                         break;
2390                 }
2391         }
2392         strreset();
2393         strescseq.type = c;
2394         term.esc |= ESC_STR;
2395         return;
2396 }
2397
2398 void
2399 tcontrolcode(uchar ascii) {
2400         static char question[UTF_SIZ] = "?";
2401
2402         switch(ascii) {
2403         case '\t':   /* HT */
2404                 tputtab(1);
2405                 return;
2406         case '\b':   /* BS */
2407                 tmoveto(term.c.x-1, term.c.y);
2408                 return;
2409         case '\r':   /* CR */
2410                 tmoveto(0, term.c.y);
2411                 return;
2412         case '\f':   /* LF */
2413         case '\v':   /* VT */
2414         case '\n':   /* LF */
2415                 /* go to first col if the mode is set */
2416                 tnewline(IS_SET(MODE_CRLF));
2417                 return;
2418         case '\a':   /* BEL */
2419                 if(term.esc & ESC_STR_END) {
2420                         /* backwards compatibility to xterm */
2421                         strhandle();
2422                 } else {
2423                         if(!(xw.state & WIN_FOCUSED))
2424                                 xseturgency(1);
2425                         if (bellvolume)
2426                                 XBell(xw.dpy, bellvolume);
2427                 }
2428                 break;
2429         case '\033': /* ESC */
2430                 csireset();
2431                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2432                 term.esc |= ESC_START;
2433                 return;
2434         case '\016': /* SO */
2435                 term.charset = 0;
2436                 return;
2437         case '\017': /* SI */
2438                 term.charset = 1;
2439                 return;
2440         case '\032': /* SUB */
2441                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2442         case '\030': /* CAN */
2443                 csireset();
2444                 break;
2445         case '\005': /* ENQ (IGNORED) */
2446         case '\000': /* NUL (IGNORED) */
2447         case '\021': /* XON (IGNORED) */
2448         case '\023': /* XOFF (IGNORED) */
2449         case 0177:   /* DEL (IGNORED) */
2450                 return;
2451         case 0x84:   /* TODO: IND */
2452                 break;
2453         case 0x85:   /* NEL -- Next line */
2454                 tnewline(1); /* always go to first col */
2455                 break;
2456         case 0x88:   /* HTS -- Horizontal tab stop */
2457                 term.tabs[term.c.x] = 1;
2458                 break;
2459         case 0x8d:   /* TODO: RI */
2460         case 0x8e:   /* TODO: SS2 */
2461         case 0x8f:   /* TODO: SS3 */
2462         case 0x98:   /* TODO: SOS */
2463                 break;
2464         case 0x9a:   /* DECID -- Identify Terminal */
2465                 ttywrite(vtiden, sizeof(vtiden) - 1);
2466                 break;
2467         case 0x9b:   /* TODO: CSI */
2468         case 0x9c:   /* TODO: ST */
2469                 break;
2470         case 0x90:   /* DCS -- Device Control String */
2471         case 0x9f:   /* APC -- Application Program Command */
2472         case 0x9e:   /* PM -- Privacy Message */
2473         case 0x9d:   /* OSC -- Operating System Command */
2474                 tstrsequence(ascii);
2475                 return;
2476         }
2477         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2478         term.esc &= ~(ESC_STR_END|ESC_STR);
2479         return;
2480 }
2481
2482 /*
2483  * returns 1 when the sequence is finished and it hasn't to read
2484  * more characters for this sequence, otherwise 0
2485  */
2486 int
2487 eschandle(uchar ascii) {
2488         switch(ascii) {
2489         case '[':
2490                 term.esc |= ESC_CSI;
2491                 return 0;
2492         case '#':
2493                 term.esc |= ESC_TEST;
2494                 return 0;
2495         case 'P': /* DCS -- Device Control String */
2496         case '_': /* APC -- Application Program Command */
2497         case '^': /* PM -- Privacy Message */
2498         case ']': /* OSC -- Operating System Command */
2499         case 'k': /* old title set compatibility */
2500                 tstrsequence(ascii);
2501                 return 0;
2502         case '(': /* GZD4 -- set primary charset G0 */
2503         case ')': /* G1D4 -- set secondary charset G1 */
2504         case '*': /* G2D4 -- set tertiary charset G2 */
2505         case '+': /* G3D4 -- set quaternary charset G3 */
2506                 term.icharset = ascii - '(';
2507                 term.esc |= ESC_ALTCHARSET;
2508                 return 0;
2509         case 'D': /* IND -- Linefeed */
2510                 if(term.c.y == term.bot) {
2511                         tscrollup(term.top, 1);
2512                 } else {
2513                         tmoveto(term.c.x, term.c.y+1);
2514                 }
2515                 break;
2516         case 'E': /* NEL -- Next line */
2517                 tnewline(1); /* always go to first col */
2518                 break;
2519         case 'H': /* HTS -- Horizontal tab stop */
2520                 term.tabs[term.c.x] = 1;
2521                 break;
2522         case 'M': /* RI -- Reverse index */
2523                 if(term.c.y == term.top) {
2524                         tscrolldown(term.top, 1);
2525                 } else {
2526                         tmoveto(term.c.x, term.c.y-1);
2527                 }
2528                 break;
2529         case 'Z': /* DECID -- Identify Terminal */
2530                 ttywrite(vtiden, sizeof(vtiden) - 1);
2531                 break;
2532         case 'c': /* RIS -- Reset to inital state */
2533                 treset();
2534                 xresettitle();
2535                 xloadcols();
2536                 break;
2537         case '=': /* DECPAM -- Application keypad */
2538                 term.mode |= MODE_APPKEYPAD;
2539                 break;
2540         case '>': /* DECPNM -- Normal keypad */
2541                 term.mode &= ~MODE_APPKEYPAD;
2542                 break;
2543         case '7': /* DECSC -- Save Cursor */
2544                 tcursor(CURSOR_SAVE);
2545                 break;
2546         case '8': /* DECRC -- Restore Cursor */
2547                 tcursor(CURSOR_LOAD);
2548                 break;
2549         case '\\': /* ST -- String Terminator */
2550                 if(term.esc & ESC_STR_END)
2551                         strhandle();
2552                 break;
2553         default:
2554                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2555                         (uchar) ascii, isprint(ascii)? ascii:'.');
2556                 break;
2557         }
2558         return 1;
2559 }
2560
2561 void
2562 tputc(char *c, int len) {
2563         uchar ascii;
2564         bool control;
2565         long unicodep;
2566         int width;
2567         Glyph *gp;
2568
2569         if(len == 1) {
2570                 width = 1;
2571                 unicodep = ascii = *c;
2572         } else {
2573                 utf8decode(c, &unicodep, UTF_SIZ);
2574                 width = wcwidth(unicodep);
2575                 control = ISCONTROLC1(unicodep);
2576                 ascii = unicodep;
2577         }
2578
2579         if(IS_SET(MODE_PRINT))
2580                 tprinter(c, len);
2581         control = ISCONTROL(unicodep);
2582
2583         /*
2584          * STR sequence must be checked before anything else
2585          * because it uses all following characters until it
2586          * receives a ESC, a SUB, a ST or any other C1 control
2587          * character.
2588          */
2589         if(term.esc & ESC_STR) {
2590                 if(width == 1 &&
2591                    (ascii == '\a' || ascii == 030 ||
2592                     ascii == 032  || ascii == 033 ||
2593                     ISCONTROLC1(unicodep))) {
2594                         term.esc &= ~(ESC_START|ESC_STR);
2595                         term.esc |= ESC_STR_END;
2596                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2597                         memmove(&strescseq.buf[strescseq.len], c, len);
2598                         strescseq.len += len;
2599                         return;
2600                 } else {
2601                 /*
2602                  * Here is a bug in terminals. If the user never sends
2603                  * some code to stop the str or esc command, then st
2604                  * will stop responding. But this is better than
2605                  * silently failing with unknown characters. At least
2606                  * then users will report back.
2607                  *
2608                  * In the case users ever get fixed, here is the code:
2609                  */
2610                 /*
2611                  * term.esc = 0;
2612                  * strhandle();
2613                  */
2614                         return;
2615                 }
2616         }
2617
2618         /*
2619          * Actions of control codes must be performed as soon they arrive
2620          * because they can be embedded inside a control sequence, and
2621          * they must not cause conflicts with sequences.
2622          */
2623         if(control) {
2624                 tcontrolcode(ascii);
2625                 /*
2626                  * control codes are not shown ever
2627                  */
2628                 return;
2629         } else if(term.esc & ESC_START) {
2630                 if(term.esc & ESC_CSI) {
2631                         csiescseq.buf[csiescseq.len++] = ascii;
2632                         if(BETWEEN(ascii, 0x40, 0x7E)
2633                                         || csiescseq.len >= \
2634                                         sizeof(csiescseq.buf)-1) {
2635                                 term.esc = 0;
2636                                 csiparse();
2637                                 csihandle();
2638                         }
2639                         return;
2640                 } else if(term.esc & ESC_ALTCHARSET) {
2641                         tdeftran(ascii);
2642                 } else if(term.esc & ESC_TEST) {
2643                         tdectest(ascii);
2644                 } else {
2645                         if (!eschandle(ascii))
2646                                 return;
2647                         /* sequence already finished */
2648                 }
2649                 term.esc = 0;
2650                 /*
2651                  * All characters which form part of a sequence are not
2652                  * printed
2653                  */
2654                 return;
2655         }
2656         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2657                 selclear(NULL);
2658
2659         gp = &term.line[term.c.y][term.c.x];
2660         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2661                 gp->mode |= ATTR_WRAP;
2662                 tnewline(1);
2663         }
2664
2665         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2666                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2667
2668         if(term.c.x+width > term.col)
2669                 tnewline(1);
2670
2671         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2672
2673         if(width == 2) {
2674                 gp->mode |= ATTR_WIDE;
2675                 if(term.c.x+1 < term.col) {
2676                         gp[1].c[0] = '\0';
2677                         gp[1].mode = ATTR_WDUMMY;
2678                 }
2679         }
2680         if(term.c.x+width < term.col) {
2681                 tmoveto(term.c.x+width, term.c.y);
2682         } else {
2683                 term.c.state |= CURSOR_WRAPNEXT;
2684         }
2685 }
2686
2687 void
2688 tresize(int col, int row) {
2689         int i;
2690         int minrow = MIN(row, term.row);
2691         int mincol = MIN(col, term.col);
2692         int slide = term.c.y - row + 1;
2693         bool *bp;
2694         TCursor c;
2695
2696         if(col < 1 || row < 1) {
2697                 fprintf(stderr,
2698                         "tresize: error resizing to %dx%d\n", col, row);
2699                 return;
2700         }
2701
2702         /* free unneeded rows */
2703         i = 0;
2704         if(slide > 0) {
2705                 /*
2706                  * slide screen to keep cursor where we expect it -
2707                  * tscrollup would work here, but we can optimize to
2708                  * memmove because we're freeing the earlier lines
2709                  */
2710                 for(/* i = 0 */; i < slide; i++) {
2711                         free(term.line[i]);
2712                         free(term.alt[i]);
2713                 }
2714                 memmove(term.line, term.line + slide, row * sizeof(Line));
2715                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2716         }
2717         for(i += row; i < term.row; i++) {
2718                 free(term.line[i]);
2719                 free(term.alt[i]);
2720         }
2721
2722         /* resize to new height */
2723         term.line = xrealloc(term.line, row * sizeof(Line));
2724         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2725         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2726         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2727
2728         /* resize each row to new width, zero-pad if needed */
2729         for(i = 0; i < minrow; i++) {
2730                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2731                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2732         }
2733
2734         /* allocate any new rows */
2735         for(/* i == minrow */; i < row; i++) {
2736                 term.line[i] = xmalloc(col * sizeof(Glyph));
2737                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2738         }
2739         if(col > term.col) {
2740                 bp = term.tabs + term.col;
2741
2742                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2743                 while(--bp > term.tabs && !*bp)
2744                         /* nothing */ ;
2745                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2746                         *bp = 1;
2747         }
2748         /* update terminal size */
2749         term.col = col;
2750         term.row = row;
2751         /* reset scrolling region */
2752         tsetscroll(0, row-1);
2753         /* make use of the LIMIT in tmoveto */
2754         tmoveto(term.c.x, term.c.y);
2755         /* Clearing both screens (it makes dirty all lines) */
2756         c = term.c;
2757         for(i = 0; i < 2; i++) {
2758                 if(mincol < col && 0 < minrow) {
2759                         tclearregion(mincol, 0, col - 1, minrow - 1);
2760                 }
2761                 if(0 < col && minrow < row) {
2762                         tclearregion(0, minrow, col - 1, row - 1);
2763                 }
2764                 tswapscreen();
2765                 tcursor(CURSOR_LOAD);
2766         }
2767         term.c = c;
2768 }
2769
2770 void
2771 xresize(int col, int row) {
2772         xw.tw = MAX(1, col * xw.cw);
2773         xw.th = MAX(1, row * xw.ch);
2774
2775         XFreePixmap(xw.dpy, xw.buf);
2776         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2777                         DefaultDepth(xw.dpy, xw.scr));
2778         XftDrawChange(xw.draw, xw.buf);
2779         xclear(0, 0, xw.w, xw.h);
2780 }
2781
2782 static inline ushort
2783 sixd_to_16bit(int x) {
2784         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2785 }
2786
2787 void
2788 xloadcols(void) {
2789         int i;
2790         XRenderColor color = { .alpha = 0xffff };
2791         static bool loaded;
2792         Color *cp;
2793
2794         if(loaded) {
2795                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2796                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2797         }
2798
2799         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2800         for(i = 0; i < LEN(colorname); i++) {
2801                 if(!colorname[i])
2802                         continue;
2803                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2804                         die("Could not allocate color '%s'\n", colorname[i]);
2805                 }
2806         }
2807
2808         /* load colors [16-231] ; same colors as xterm */
2809         for(i = 16; i < 6*6*6+16; i++) {
2810                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2811                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2812                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2813                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2814                         die("Could not allocate color %d\n", i);
2815         }
2816
2817         /* load colors [232-255] ; grayscale */
2818         for(; i < 256; i++) {
2819                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2820                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2821                         die("Could not allocate color %d\n", i);
2822         }
2823         loaded = true;
2824 }
2825
2826 int
2827 xsetcolorname(int x, const char *name) {
2828         XRenderColor color = { .alpha = 0xffff };
2829         Color ncolor;
2830
2831         if(!BETWEEN(x, 0, LEN(colorname)))
2832                 return 1;
2833
2834         if(!name) {
2835                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2836                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2837                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2838                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2839                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2840                                                 xw.cmap, &color, &ncolor)) {
2841                                 return 1;
2842                         }
2843
2844                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2845                         dc.col[x] = ncolor;
2846                         return 0;
2847                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2848                         color.red = color.green = color.blue = \
2849                                     0x0808 + 0x0a0a * (x - (16 + 216));
2850                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2851                                                 xw.cmap, &color, &ncolor)) {
2852                                 return 1;
2853                         }
2854
2855                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2856                         dc.col[x] = ncolor;
2857                         return 0;
2858                 } else { /* system colors */
2859                         name = colorname[x];
2860                 }
2861         }
2862         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2863                 return 1;
2864
2865         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2866         dc.col[x] = ncolor;
2867         return 0;
2868 }
2869
2870 void
2871 xtermclear(int col1, int row1, int col2, int row2) {
2872         XftDrawRect(xw.draw,
2873                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2874                         borderpx + col1 * xw.cw,
2875                         borderpx + row1 * xw.ch,
2876                         (col2-col1+1) * xw.cw,
2877                         (row2-row1+1) * xw.ch);
2878 }
2879
2880 /*
2881  * Absolute coordinates.
2882  */
2883 void
2884 xclear(int x1, int y1, int x2, int y2) {
2885         XftDrawRect(xw.draw,
2886                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2887                         x1, y1, x2-x1, y2-y1);
2888 }
2889
2890 void
2891 xhints(void) {
2892         XClassHint class = {opt_class ? opt_class : termname, termname};
2893         XWMHints wm = {.flags = InputHint, .input = 1};
2894         XSizeHints *sizeh = NULL;
2895
2896         sizeh = XAllocSizeHints();
2897
2898         sizeh->flags = PSize | PResizeInc | PBaseSize;
2899         sizeh->height = xw.h;
2900         sizeh->width = xw.w;
2901         sizeh->height_inc = xw.ch;
2902         sizeh->width_inc = xw.cw;
2903         sizeh->base_height = 2 * borderpx;
2904         sizeh->base_width = 2 * borderpx;
2905         if(xw.isfixed == True) {
2906                 sizeh->flags |= PMaxSize | PMinSize;
2907                 sizeh->min_width = sizeh->max_width = xw.w;
2908                 sizeh->min_height = sizeh->max_height = xw.h;
2909         }
2910         if(xw.gm & (XValue|YValue)) {
2911                 sizeh->flags |= USPosition | PWinGravity;
2912                 sizeh->x = xw.l;
2913                 sizeh->y = xw.t;
2914                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2915         }
2916
2917         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2918                         &class);
2919         XFree(sizeh);
2920 }
2921
2922 int
2923 xgeommasktogravity(int mask) {
2924         switch(mask & (XNegative|YNegative)) {
2925         case 0:
2926                 return NorthWestGravity;
2927         case XNegative:
2928                 return NorthEastGravity;
2929         case YNegative:
2930                 return SouthWestGravity;
2931         }
2932         return SouthEastGravity;
2933 }
2934
2935 int
2936 xloadfont(Font *f, FcPattern *pattern) {
2937         FcPattern *match;
2938         FcResult result;
2939
2940         match = FcFontMatch(NULL, pattern, &result);
2941         if(!match)
2942                 return 1;
2943
2944         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2945                 FcPatternDestroy(match);
2946                 return 1;
2947         }
2948
2949         f->set = NULL;
2950         f->pattern = FcPatternDuplicate(pattern);
2951
2952         f->ascent = f->match->ascent;
2953         f->descent = f->match->descent;
2954         f->lbearing = 0;
2955         f->rbearing = f->match->max_advance_width;
2956
2957         f->height = f->ascent + f->descent;
2958         f->width = f->lbearing + f->rbearing;
2959
2960         return 0;
2961 }
2962
2963 void
2964 xloadfonts(char *fontstr, double fontsize) {
2965         FcPattern *pattern;
2966         FcResult r_sz, r_psz;
2967         double fontval;
2968         float ceilf(float);
2969
2970         if(fontstr[0] == '-') {
2971                 pattern = XftXlfdParse(fontstr, False, False);
2972         } else {
2973                 pattern = FcNameParse((FcChar8 *)fontstr);
2974         }
2975
2976         if(!pattern)
2977                 die("st: can't open font %s\n", fontstr);
2978
2979         if(fontsize > 0) {
2980                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2981                 FcPatternDel(pattern, FC_SIZE);
2982                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2983                 usedfontsize = fontsize;
2984         } else {
2985                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2986                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2987                 if(r_psz == FcResultMatch) {
2988                         usedfontsize = fontval;
2989                 } else if(r_sz == FcResultMatch) {
2990                         usedfontsize = -1;
2991                 } else {
2992                         /*
2993                          * Default font size is 12, if none given. This is to
2994                          * have a known usedfontsize value.
2995                          */
2996                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2997                         usedfontsize = 12;
2998                 }
2999                 defaultfontsize = usedfontsize;
3000         }
3001
3002         FcConfigSubstitute(0, pattern, FcMatchPattern);
3003         FcDefaultSubstitute(pattern);
3004
3005         if(xloadfont(&dc.font, pattern))
3006                 die("st: can't open font %s\n", fontstr);
3007
3008         if(usedfontsize < 0) {
3009                 FcPatternGetDouble(dc.font.match->pattern,
3010                                    FC_PIXEL_SIZE, 0, &fontval);
3011                 usedfontsize = fontval;
3012                 if(fontsize == 0)
3013                         defaultfontsize = fontval;
3014         }
3015
3016         /* Setting character width and height. */
3017         xw.cw = ceilf(dc.font.width * cwscale);
3018         xw.ch = ceilf(dc.font.height * chscale);
3019
3020         FcPatternDel(pattern, FC_SLANT);
3021         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3022         if(xloadfont(&dc.ifont, pattern))
3023                 die("st: can't open font %s\n", fontstr);
3024
3025         FcPatternDel(pattern, FC_WEIGHT);
3026         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3027         if(xloadfont(&dc.ibfont, pattern))
3028                 die("st: can't open font %s\n", fontstr);
3029
3030         FcPatternDel(pattern, FC_SLANT);
3031         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3032         if(xloadfont(&dc.bfont, pattern))
3033                 die("st: can't open font %s\n", fontstr);
3034
3035         FcPatternDestroy(pattern);
3036 }
3037
3038 int
3039 xloadfontset(Font *f) {
3040         FcResult result;
3041
3042         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
3043                 return 1;
3044         return 0;
3045 }
3046
3047 void
3048 xunloadfont(Font *f) {
3049         XftFontClose(xw.dpy, f->match);
3050         FcPatternDestroy(f->pattern);
3051         if(f->set)
3052                 FcFontSetDestroy(f->set);
3053 }
3054
3055 void
3056 xunloadfonts(void) {
3057         /* Free the loaded fonts in the font cache.  */
3058         while(frclen > 0)
3059                 XftFontClose(xw.dpy, frc[--frclen].font);
3060
3061         xunloadfont(&dc.font);
3062         xunloadfont(&dc.bfont);
3063         xunloadfont(&dc.ifont);
3064         xunloadfont(&dc.ibfont);
3065 }
3066
3067 void
3068 xzoom(const Arg *arg) {
3069         Arg larg;
3070
3071         larg.i = usedfontsize + arg->i;
3072         xzoomabs(&larg);
3073 }
3074
3075 void
3076 xzoomabs(const Arg *arg) {
3077         xunloadfonts();
3078         xloadfonts(usedfont, arg->i);
3079         cresize(0, 0);
3080         redraw(0);
3081         xhints();
3082 }
3083
3084 void
3085 xzoomreset(const Arg *arg) {
3086         Arg larg;
3087
3088         if(defaultfontsize > 0) {
3089                 larg.i = defaultfontsize;
3090                 xzoomabs(&larg);
3091         }
3092 }
3093
3094 void
3095 xinit(void) {
3096         XGCValues gcvalues;
3097         Cursor cursor;
3098         Window parent;
3099         pid_t thispid = getpid();
3100
3101         if(!(xw.dpy = XOpenDisplay(NULL)))
3102                 die("Can't open display\n");
3103         xw.scr = XDefaultScreen(xw.dpy);
3104         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3105
3106         /* font */
3107         if(!FcInit())
3108                 die("Could not init fontconfig.\n");
3109
3110         usedfont = (opt_font == NULL)? font : opt_font;
3111         xloadfonts(usedfont, 0);
3112
3113         /* colors */
3114         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3115         xloadcols();
3116
3117         /* adjust fixed window geometry */
3118         xw.w = 2 * borderpx + term.col * xw.cw;
3119         xw.h = 2 * borderpx + term.row * xw.ch;
3120         if(xw.gm & XNegative)
3121                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3122         if(xw.gm & YNegative)
3123                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3124
3125         /* Events */
3126         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3127         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3128         xw.attrs.bit_gravity = NorthWestGravity;
3129         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3130                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3131                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3132         xw.attrs.colormap = xw.cmap;
3133
3134         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3135                         XRootWindow(xw.dpy, xw.scr);
3136         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3137                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3138                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3139                         | CWEventMask | CWColormap, &xw.attrs);
3140
3141         memset(&gcvalues, 0, sizeof(gcvalues));
3142         gcvalues.graphics_exposures = False;
3143         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3144                         &gcvalues);
3145         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3146                         DefaultDepth(xw.dpy, xw.scr));
3147         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3148         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3149
3150         /* Xft rendering context */
3151         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3152
3153         /* input methods */
3154         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3155                 XSetLocaleModifiers("@im=local");
3156                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3157                         XSetLocaleModifiers("@im=");
3158                         if((xw.xim = XOpenIM(xw.dpy,
3159                                         NULL, NULL, NULL)) == NULL) {
3160                                 die("XOpenIM failed. Could not open input"
3161                                         " device.\n");
3162                         }
3163                 }
3164         }
3165         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3166                                            | XIMStatusNothing, XNClientWindow, xw.win,
3167                                            XNFocusWindow, xw.win, NULL);
3168         if(xw.xic == NULL)
3169                 die("XCreateIC failed. Could not obtain input method.\n");
3170
3171         /* white cursor, black outline */
3172         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3173         XDefineCursor(xw.dpy, xw.win, cursor);
3174         XRecolorCursor(xw.dpy, cursor,
3175                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3176                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3177
3178         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3179         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3180         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3181         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3182
3183         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3184         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3185                         PropModeReplace, (uchar *)&thispid, 1);
3186
3187         xresettitle();
3188         XMapWindow(xw.dpy, xw.win);
3189         xhints();
3190         XSync(xw.dpy, False);
3191 }
3192
3193 void
3194 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3195         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3196             width = charlen * xw.cw, xp, i;
3197         int frcflags;
3198         int u8fl, u8fblen, u8cblen, doesexist;
3199         char *u8c, *u8fs;
3200         long unicodep;
3201         Font *font = &dc.font;
3202         FcResult fcres;
3203         FcPattern *fcpattern, *fontpattern;
3204         FcFontSet *fcsets[] = { NULL };
3205         FcCharSet *fccharset;
3206         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3207         XRenderColor colfg, colbg;
3208         XRectangle r;
3209         int oneatatime;
3210
3211         frcflags = FRC_NORMAL;
3212
3213         if(base.mode & ATTR_ITALIC) {
3214                 if(base.fg == defaultfg)
3215                         base.fg = defaultitalic;
3216                 font = &dc.ifont;
3217                 frcflags = FRC_ITALIC;
3218         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3219                 if(base.fg == defaultfg)
3220                         base.fg = defaultitalic;
3221                 font = &dc.ibfont;
3222                 frcflags = FRC_ITALICBOLD;
3223         } else if(base.mode & ATTR_UNDERLINE) {
3224                 if(base.fg == defaultfg)
3225                         base.fg = defaultunderline;
3226         }
3227
3228         if(IS_TRUECOL(base.fg)) {
3229                 colfg.alpha = 0xffff;
3230                 colfg.red = TRUERED(base.fg);
3231                 colfg.green = TRUEGREEN(base.fg);
3232                 colfg.blue = TRUEBLUE(base.fg);
3233                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3234                 fg = &truefg;
3235         } else {
3236                 fg = &dc.col[base.fg];
3237         }
3238
3239         if(IS_TRUECOL(base.bg)) {
3240                 colbg.alpha = 0xffff;
3241                 colbg.green = TRUEGREEN(base.bg);
3242                 colbg.red = TRUERED(base.bg);
3243                 colbg.blue = TRUEBLUE(base.bg);
3244                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3245                 bg = &truebg;
3246         } else {
3247                 bg = &dc.col[base.bg];
3248         }
3249
3250         if(base.mode & ATTR_BOLD) {
3251                 /*
3252                  * change basic system colors [0-7]
3253                  * to bright system colors [8-15]
3254                  */
3255                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3256                         fg = &dc.col[base.fg + 8];
3257
3258                 if(base.mode & ATTR_ITALIC) {
3259                         font = &dc.ibfont;
3260                         frcflags = FRC_ITALICBOLD;
3261                 } else {
3262                         font = &dc.bfont;
3263                         frcflags = FRC_BOLD;
3264                 }
3265         }
3266
3267         if(IS_SET(MODE_REVERSE)) {
3268                 if(fg == &dc.col[defaultfg]) {
3269                         fg = &dc.col[defaultbg];
3270                 } else {
3271                         colfg.red = ~fg->color.red;
3272                         colfg.green = ~fg->color.green;
3273                         colfg.blue = ~fg->color.blue;
3274                         colfg.alpha = fg->color.alpha;
3275                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3276                                         &revfg);
3277                         fg = &revfg;
3278                 }
3279
3280                 if(bg == &dc.col[defaultbg]) {
3281                         bg = &dc.col[defaultfg];
3282                 } else {
3283                         colbg.red = ~bg->color.red;
3284                         colbg.green = ~bg->color.green;
3285                         colbg.blue = ~bg->color.blue;
3286                         colbg.alpha = bg->color.alpha;
3287                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3288                                         &revbg);
3289                         bg = &revbg;
3290                 }
3291         }
3292
3293         if(base.mode & ATTR_REVERSE) {
3294                 temp = fg;
3295                 fg = bg;
3296                 bg = temp;
3297         }
3298
3299         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3300                 colfg.red = fg->color.red / 2;
3301                 colfg.green = fg->color.green / 2;
3302                 colfg.blue = fg->color.blue / 2;
3303                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3304                 fg = &revfg;
3305         }
3306
3307         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3308                 fg = bg;
3309
3310         if(base.mode & ATTR_INVISIBLE)
3311                 fg = bg;
3312
3313         /* Intelligent cleaning up of the borders. */
3314         if(x == 0) {
3315                 xclear(0, (y == 0)? 0 : winy, borderpx,
3316                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3317         }
3318         if(x + charlen >= term.col) {
3319                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3320                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3321         }
3322         if(y == 0)
3323                 xclear(winx, 0, winx + width, borderpx);
3324         if(y == term.row-1)
3325                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3326
3327         /* Clean up the region we want to draw to. */
3328         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3329
3330         /* Set the clip region because Xft is sometimes dirty. */
3331         r.x = 0;
3332         r.y = 0;
3333         r.height = xw.ch;
3334         r.width = width;
3335         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3336
3337         for(xp = winx; bytelen > 0;) {
3338                 /*
3339                  * Search for the range in the to be printed string of glyphs
3340                  * that are in the main font. Then print that range. If
3341                  * some glyph is found that is not in the font, do the
3342                  * fallback dance.
3343                  */
3344                 u8fs = s;
3345                 u8fblen = 0;
3346                 u8fl = 0;
3347                 oneatatime = font->width != xw.cw;
3348                 for(;;) {
3349                         u8c = s;
3350                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3351                         s += u8cblen;
3352                         bytelen -= u8cblen;
3353
3354                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3355                         if(doesexist) {
3356                                         u8fl++;
3357                                         u8fblen += u8cblen;
3358                                         if(!oneatatime && bytelen > 0)
3359                                                         continue;
3360                         }
3361
3362                         if(u8fl > 0) {
3363                                 XftDrawStringUtf8(xw.draw, fg,
3364                                                 font->match, xp,
3365                                                 winy + font->ascent,
3366                                                 (FcChar8 *)u8fs,
3367                                                 u8fblen);
3368                                 xp += xw.cw * u8fl;
3369                         }
3370                         break;
3371                 }
3372                 if(doesexist) {
3373                         if(oneatatime)
3374                                 continue;
3375                         break;
3376                 }
3377
3378                 /* Search the font cache. */
3379                 for(i = 0; i < frclen; i++) {
3380                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3381                                         && frc[i].flags == frcflags) {
3382                                 break;
3383                         }
3384                 }
3385
3386                 /* Nothing was found. */
3387                 if(i >= frclen) {
3388                         if(!font->set)
3389                                 xloadfontset(font);
3390                         fcsets[0] = font->set;
3391
3392                         /*
3393                          * Nothing was found in the cache. Now use
3394                          * some dozen of Fontconfig calls to get the
3395                          * font for one single character.
3396                          *
3397                          * Xft and fontconfig are design failures.
3398                          */
3399                         fcpattern = FcPatternDuplicate(font->pattern);
3400                         fccharset = FcCharSetCreate();
3401
3402                         FcCharSetAddChar(fccharset, unicodep);
3403                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3404                                         fccharset);
3405                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3406                                         FcTrue);
3407
3408                         FcConfigSubstitute(0, fcpattern,
3409                                         FcMatchPattern);
3410                         FcDefaultSubstitute(fcpattern);
3411
3412                         fontpattern = FcFontSetMatch(0, fcsets,
3413                                         FcTrue, fcpattern, &fcres);
3414
3415                         /*
3416                          * Overwrite or create the new cache entry.
3417                          */
3418                         if(frclen >= LEN(frc)) {
3419                                 frclen = LEN(frc) - 1;
3420                                 XftFontClose(xw.dpy, frc[frclen].font);
3421                         }
3422
3423                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3424                                         fontpattern);
3425                         frc[frclen].flags = frcflags;
3426
3427                         i = frclen;
3428                         frclen++;
3429
3430                         FcPatternDestroy(fcpattern);
3431                         FcCharSetDestroy(fccharset);
3432                 }
3433
3434                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3435                                 xp, winy + frc[i].font->ascent,
3436                                 (FcChar8 *)u8c, u8cblen);
3437
3438                 xp += xw.cw * wcwidth(unicodep);
3439         }
3440
3441         /*
3442          * This is how the loop above actually should be. Why does the
3443          * application have to care about font details?
3444          *
3445          * I have to repeat: Xft and Fontconfig are design failures.
3446          */
3447         /*
3448         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3449                         winy + font->ascent, (FcChar8 *)s, bytelen);
3450         */
3451
3452         if(base.mode & ATTR_UNDERLINE) {
3453                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3454                                 width, 1);
3455         }
3456
3457         if(base.mode & ATTR_STRUCK) {
3458                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3459                                 width, 1);
3460         }
3461
3462         /* Reset clip to none. */
3463         XftDrawSetClip(xw.draw, 0);
3464 }
3465
3466 void
3467 xdrawcursor(void) {
3468         static int oldx = 0, oldy = 0;
3469         int sl, width, curx;
3470         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3471
3472         LIMIT(oldx, 0, term.col-1);
3473         LIMIT(oldy, 0, term.row-1);
3474
3475         curx = term.c.x;
3476
3477         /* adjust position if in dummy */
3478         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3479                 oldx--;
3480         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3481                 curx--;
3482
3483         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3484
3485         /* remove the old cursor */
3486         sl = utf8len(term.line[oldy][oldx].c);
3487         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3488         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3489                         oldy, width, sl);
3490
3491         if(IS_SET(MODE_HIDE))
3492                 return;
3493
3494         /* draw the new one */
3495         if(xw.state & WIN_FOCUSED) {
3496                 if(IS_SET(MODE_REVERSE)) {
3497                         g.mode |= ATTR_REVERSE;
3498                         g.fg = defaultcs;
3499                         g.bg = defaultfg;
3500                 }
3501
3502                 sl = utf8len(g.c);
3503                 width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3504                         ? 2 : 1;
3505                 xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3506         } else {
3507                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3508                                 borderpx + curx * xw.cw,
3509                                 borderpx + term.c.y * xw.ch,
3510                                 xw.cw - 1, 1);
3511                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3512                                 borderpx + curx * xw.cw,
3513                                 borderpx + term.c.y * xw.ch,
3514                                 1, xw.ch - 1);
3515                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3516                                 borderpx + (curx + 1) * xw.cw - 1,
3517                                 borderpx + term.c.y * xw.ch,
3518                                 1, xw.ch - 1);
3519                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3520                                 borderpx + curx * xw.cw,
3521                                 borderpx + (term.c.y + 1) * xw.ch - 1,
3522                                 xw.cw, 1);
3523         }
3524         oldx = curx, oldy = term.c.y;
3525 }
3526
3527
3528 void
3529 xsettitle(char *p) {
3530         XTextProperty prop;
3531
3532         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3533                         &prop);
3534         XSetWMName(xw.dpy, xw.win, &prop);
3535         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3536         XFree(prop.value);
3537 }
3538
3539 void
3540 xresettitle(void) {
3541         xsettitle(opt_title ? opt_title : "st");
3542 }
3543
3544 void
3545 redraw(int timeout) {
3546         struct timespec tv = {0, timeout * 1000};
3547
3548         tfulldirt();
3549         draw();
3550
3551         if(timeout > 0) {
3552                 nanosleep(&tv, NULL);
3553                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3554         }
3555 }
3556
3557 void
3558 draw(void) {
3559         drawregion(0, 0, term.col, term.row);
3560         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3561                         xw.h, 0, 0);
3562         XSetForeground(xw.dpy, dc.gc,
3563                         dc.col[IS_SET(MODE_REVERSE)?
3564                                 defaultfg : defaultbg].pixel);
3565 }
3566
3567 void
3568 drawregion(int x1, int y1, int x2, int y2) {
3569         int ic, ib, x, y, ox, sl;
3570         Glyph base, new;
3571         char buf[DRAW_BUF_SIZ];
3572         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3573         long unicodep;
3574
3575         if(!(xw.state & WIN_VISIBLE))
3576                 return;
3577
3578         for(y = y1; y < y2; y++) {
3579                 if(!term.dirty[y])
3580                         continue;
3581
3582                 xtermclear(0, y, term.col, y);
3583                 term.dirty[y] = 0;
3584                 base = term.line[y][0];
3585                 ic = ib = ox = 0;
3586                 for(x = x1; x < x2; x++) {
3587                         new = term.line[y][x];
3588                         if(new.mode == ATTR_WDUMMY)
3589                                 continue;
3590                         if(ena_sel && selected(x, y))
3591                                 new.mode ^= ATTR_REVERSE;
3592                         if(ib > 0 && (ATTRCMP(base, new)
3593                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3594                                 xdraws(buf, base, ox, y, ic, ib);
3595                                 ic = ib = 0;
3596                         }
3597                         if(ib == 0) {
3598                                 ox = x;
3599                                 base = new;
3600                         }
3601
3602                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3603                         memcpy(buf+ib, new.c, sl);
3604                         ib += sl;
3605                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3606                 }
3607                 if(ib > 0)
3608                         xdraws(buf, base, ox, y, ic, ib);
3609         }
3610         xdrawcursor();
3611 }
3612
3613 void
3614 expose(XEvent *ev) {
3615         XExposeEvent *e = &ev->xexpose;
3616
3617         if(xw.state & WIN_REDRAW) {
3618                 if(!e->count)
3619                         xw.state &= ~WIN_REDRAW;
3620         }
3621         redraw(0);
3622 }
3623
3624 void
3625 visibility(XEvent *ev) {
3626         XVisibilityEvent *e = &ev->xvisibility;
3627
3628         if(e->state == VisibilityFullyObscured) {
3629                 xw.state &= ~WIN_VISIBLE;
3630         } else if(!(xw.state & WIN_VISIBLE)) {
3631                 /* need a full redraw for next Expose, not just a buf copy */
3632                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3633         }
3634 }
3635
3636 void
3637 unmap(XEvent *ev) {
3638         xw.state &= ~WIN_VISIBLE;
3639 }
3640
3641 void
3642 xsetpointermotion(int set) {
3643         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3644         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3645 }
3646
3647 void
3648 xseturgency(int add) {
3649         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3650
3651         MODBIT(h->flags, add, XUrgencyHint);
3652         XSetWMHints(xw.dpy, xw.win, h);
3653         XFree(h);
3654 }
3655
3656 void
3657 focus(XEvent *ev) {
3658         XFocusChangeEvent *e = &ev->xfocus;
3659
3660         if(e->mode == NotifyGrab)
3661                 return;
3662
3663         if(ev->type == FocusIn) {
3664                 XSetICFocus(xw.xic);
3665                 xw.state |= WIN_FOCUSED;
3666                 xseturgency(0);
3667                 if(IS_SET(MODE_FOCUS))
3668                         ttywrite("\033[I", 3);
3669         } else {
3670                 XUnsetICFocus(xw.xic);
3671                 xw.state &= ~WIN_FOCUSED;
3672                 if(IS_SET(MODE_FOCUS))
3673                         ttywrite("\033[O", 3);
3674         }
3675 }
3676
3677 static inline bool
3678 match(uint mask, uint state) {
3679         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3680 }
3681
3682 void
3683 numlock(const Arg *dummy) {
3684         term.numlock ^= 1;
3685 }
3686
3687 char*
3688 kmap(KeySym k, uint state) {
3689         Key *kp;
3690         int i;
3691
3692         /* Check for mapped keys out of X11 function keys. */
3693         for(i = 0; i < LEN(mappedkeys); i++) {
3694                 if(mappedkeys[i] == k)
3695                         break;
3696         }
3697         if(i == LEN(mappedkeys)) {
3698                 if((k & 0xFFFF) < 0xFD00)
3699                         return NULL;
3700         }
3701
3702         for(kp = key; kp < key + LEN(key); kp++) {
3703                 if(kp->k != k)
3704                         continue;
3705
3706                 if(!match(kp->mask, state))
3707                         continue;
3708
3709                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3710                         continue;
3711                 if(term.numlock && kp->appkey == 2)
3712                         continue;
3713
3714                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3715                         continue;
3716
3717                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3718                         continue;
3719
3720                 return kp->s;
3721         }
3722
3723         return NULL;
3724 }
3725
3726 void
3727 kpress(XEvent *ev) {
3728         XKeyEvent *e = &ev->xkey;
3729         KeySym ksym;
3730         char buf[32], *customkey;
3731         int len;
3732         long c;
3733         Status status;
3734         Shortcut *bp;
3735
3736         if(IS_SET(MODE_KBDLOCK))
3737                 return;
3738
3739         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3740         /* 1. shortcuts */
3741         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3742                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3743                         bp->func(&(bp->arg));
3744                         return;
3745                 }
3746         }
3747
3748         /* 2. custom keys from config.h */
3749         if((customkey = kmap(ksym, e->state))) {
3750                 ttysend(customkey, strlen(customkey));
3751                 return;
3752         }
3753
3754         /* 3. composed string from input method */
3755         if(len == 0)
3756                 return;
3757         if(len == 1 && e->state & Mod1Mask) {
3758                 if(IS_SET(MODE_8BIT)) {
3759                         if(*buf < 0177) {
3760                                 c = *buf | 0x80;
3761                                 len = utf8encode(c, buf, UTF_SIZ);
3762                         }
3763                 } else {
3764                         buf[1] = buf[0];
3765                         buf[0] = '\033';
3766                         len = 2;
3767                 }
3768         }
3769         ttysend(buf, len);
3770 }
3771
3772
3773 void
3774 cmessage(XEvent *e) {
3775         /*
3776          * See xembed specs
3777          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3778          */
3779         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3780                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3781                         xw.state |= WIN_FOCUSED;
3782                         xseturgency(0);
3783                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3784                         xw.state &= ~WIN_FOCUSED;
3785                 }
3786         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3787                 /* Send SIGHUP to shell */
3788                 kill(pid, SIGHUP);
3789                 exit(EXIT_SUCCESS);
3790         }
3791 }
3792
3793 void
3794 cresize(int width, int height) {
3795         int col, row;
3796
3797         if(width != 0)
3798                 xw.w = width;
3799         if(height != 0)
3800                 xw.h = height;
3801
3802         col = (xw.w - 2 * borderpx) / xw.cw;
3803         row = (xw.h - 2 * borderpx) / xw.ch;
3804
3805         tresize(col, row);
3806         xresize(col, row);
3807         ttyresize();
3808 }
3809
3810 void
3811 resize(XEvent *e) {
3812         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3813                 return;
3814
3815         cresize(e->xconfigure.width, e->xconfigure.height);
3816 }
3817
3818 void
3819 run(void) {
3820         XEvent ev;
3821         int w = xw.w, h = xw.h;
3822         fd_set rfd;
3823         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3824         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3825         long deltatime;
3826
3827         /* Waiting for window mapping */
3828         while(1) {
3829                 XNextEvent(xw.dpy, &ev);
3830                 if(XFilterEvent(&ev, None))
3831                         continue;
3832                 if(ev.type == ConfigureNotify) {
3833                         w = ev.xconfigure.width;
3834                         h = ev.xconfigure.height;
3835                 } else if(ev.type == MapNotify) {
3836                         break;
3837                 }
3838         }
3839
3840         ttynew();
3841         cresize(w, h);
3842
3843         clock_gettime(CLOCK_MONOTONIC, &last);
3844         lastblink = last;
3845
3846         for(xev = actionfps;;) {
3847                 FD_ZERO(&rfd);
3848                 FD_SET(cmdfd, &rfd);
3849                 FD_SET(xfd, &rfd);
3850
3851                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3852                         if(errno == EINTR)
3853                                 continue;
3854                         die("select failed: %s\n", strerror(errno));
3855                 }
3856                 if(FD_ISSET(cmdfd, &rfd)) {
3857                         ttyread();
3858                         if(blinktimeout) {
3859                                 blinkset = tattrset(ATTR_BLINK);
3860                                 if(!blinkset)
3861                                         MODBIT(term.mode, 0, MODE_BLINK);
3862                         }
3863                 }
3864
3865                 if(FD_ISSET(xfd, &rfd))
3866                         xev = actionfps;
3867
3868                 clock_gettime(CLOCK_MONOTONIC, &now);
3869                 drawtimeout.tv_sec = 0;
3870                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3871                 tv = &drawtimeout;
3872
3873                 dodraw = 0;
3874                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3875                         tsetdirtattr(ATTR_BLINK);
3876                         term.mode ^= MODE_BLINK;
3877                         lastblink = now;
3878                         dodraw = 1;
3879                 }
3880                 deltatime = TIMEDIFF(now, last);
3881                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3882                                 || deltatime < 0) {
3883                         dodraw = 1;
3884                         last = now;
3885                 }
3886
3887                 if(dodraw) {
3888                         while(XPending(xw.dpy)) {
3889                                 XNextEvent(xw.dpy, &ev);
3890                                 if(XFilterEvent(&ev, None))
3891                                         continue;
3892                                 if(handler[ev.type])
3893                                         (handler[ev.type])(&ev);
3894                         }
3895
3896                         draw();
3897                         XFlush(xw.dpy);
3898
3899                         if(xev && !FD_ISSET(xfd, &rfd))
3900                                 xev--;
3901                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3902                                 if(blinkset) {
3903                                         if(TIMEDIFF(now, lastblink) \
3904                                                         > blinktimeout) {
3905                                                 drawtimeout.tv_nsec = 1000;
3906                                         } else {
3907                                                 drawtimeout.tv_nsec = (1E6 * \
3908                                                         (blinktimeout - \
3909                                                         TIMEDIFF(now,
3910                                                                 lastblink)));
3911                                         }
3912                                 } else {
3913                                         tv = NULL;
3914                                 }
3915                         }
3916                 }
3917         }
3918 }
3919
3920 void
3921 usage(void) {
3922         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3923         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
3924         "          [-i] [-t title] [-w windowid] [-e command ...]\n", argv0);
3925 }
3926
3927 int
3928 main(int argc, char *argv[]) {
3929         char *titles;
3930         uint cols = 80, rows = 24;
3931
3932         xw.l = xw.t = 0;
3933         xw.isfixed = False;
3934
3935         ARGBEGIN {
3936         case 'a':
3937                 allowaltscreen = false;
3938                 break;
3939         case 'c':
3940                 opt_class = EARGF(usage());
3941                 break;
3942         case 'e':
3943                 /* eat all remaining arguments */
3944                 if(argc > 1) {
3945                         opt_cmd = &argv[1];
3946                         if(argv[1] != NULL && opt_title == NULL) {
3947                                 titles = xstrdup(argv[1]);
3948                                 opt_title = basename(titles);
3949                         }
3950                 }
3951                 goto run;
3952         case 'f':
3953                 opt_font = EARGF(usage());
3954                 break;
3955         case 'g':
3956                 xw.gm = XParseGeometry(EARGF(usage()),
3957                                 &xw.l, &xw.t, &cols, &rows);
3958                 break;
3959         case 'i':
3960                 xw.isfixed = True;
3961                 break;
3962         case 'o':
3963                 opt_io = EARGF(usage());
3964                 break;
3965         case 't':
3966                 opt_title = EARGF(usage());
3967                 break;
3968         case 'w':
3969                 opt_embed = EARGF(usage());
3970                 break;
3971         case 'v':
3972         default:
3973                 usage();
3974         } ARGEND;
3975
3976 run:
3977         setlocale(LC_CTYPE, "");
3978         XSetLocaleModifiers("");
3979         tnew(cols? cols : 1, rows? rows : 1);
3980         xinit();
3981         selinit();
3982         run();
3983
3984         return 0;
3985 }
3986