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 <sys/ioctl.h>
  15 #include <sys/select.h>
  16 #include <sys/stat.h>
  17 #include <sys/time.h>
  18 #include <sys/types.h>
  19 #include <sys/wait.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22 #include <X11/Xatom.h>
  23 #include <X11/Xlib.h>
  24 #include <X11/Xutil.h>
  25 #include <X11/cursorfont.h>
  26 #include <X11/keysym.h>
  27 #include <X11/Xft/Xft.h>
  28 #include <fontconfig/fontconfig.h>
  29
  30 #include "arg.h"
  31
  32 char *argv0;
  33
  34 #define Glyph Glyph_
  35 #define Font Font_
  36 #define Draw XftDraw *
  37 #define Colour XftColor
  38 #define Colourmap Colormap
  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_SIZ       4
  55 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  56 #define ESC_ARG_SIZ   16
  57 #define STR_BUF_SIZ   ESC_BUF_SIZ
  58 #define STR_ARG_SIZ   ESC_ARG_SIZ
  59 #define DRAW_BUF_SIZ  20*1024
  60 #define XK_ANY_MOD    UINT_MAX
  61 #define XK_NO_MOD     0
  62 #define XK_SWITCH_MOD (1<<13)
  63
  64 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  65
  66 /* macros */
  67 #define SERRNO strerror(errno)
  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 LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  74 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  75 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  76 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  77
  78 #define VT102ID "\033[?6c"
  79
  80 enum glyph_attribute {
  81         ATTR_NULL      = 0,
  82         ATTR_REVERSE   = 1,
  83         ATTR_UNDERLINE = 2,
  84         ATTR_BOLD      = 4,
  85         ATTR_GFX       = 8,
  86         ATTR_ITALIC    = 16,
  87         ATTR_BLINK     = 32,
  88 };
  89
  90 enum cursor_movement {
  91         CURSOR_SAVE,
  92         CURSOR_LOAD
  93 };
  94
  95 enum cursor_state {
  96         CURSOR_DEFAULT  = 0,
  97         CURSOR_WRAPNEXT = 1,
  98         CURSOR_ORIGIN   = 2
  99 };
 100
 101 enum glyph_state {
 102         GLYPH_SET   = 1,
 103         GLYPH_DIRTY = 2
 104 };
 105
 106 enum term_mode {
 107         MODE_WRAP        = 1,
 108         MODE_INSERT      = 2,
 109         MODE_APPKEYPAD   = 4,
 110         MODE_ALTSCREEN   = 8,
 111         MODE_CRLF        = 16,
 112         MODE_MOUSEBTN    = 32,
 113         MODE_MOUSEMOTION = 64,
 114         MODE_MOUSE       = 32|64,
 115         MODE_REVERSE     = 128,
 116         MODE_KBDLOCK     = 256,
 117         MODE_HIDE        = 512,
 118         MODE_ECHO        = 1024,
 119         MODE_APPCURSOR   = 2048,
 120         MODE_MOUSESGR    = 4096,
 121 };
 122
 123 enum escape_state {
 124         ESC_START      = 1,
 125         ESC_CSI = 2,
 126         ESC_STR = 4, /* DSC, OSC, PM, APC */
 127         ESC_ALTCHARSET = 8,
 128         ESC_STR_END    = 16, /* a final string was encountered */
 129         ESC_TEST       = 32, /* Enter in test mode */
 130 };
 131
 132 enum window_state {
 133         WIN_VISIBLE = 1,
 134         WIN_REDRAW  = 2,
 135         WIN_FOCUSED = 4
 136 };
 137
 138 enum selection_type {
 139         SEL_REGULAR = 1,
 140         SEL_RECTANGULAR = 2
 141 };
 142
 143 /* bit macro */
 144 #undef B0
 145 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 146
 147 typedef unsigned char uchar;
 148 typedef unsigned int uint;
 149 typedef unsigned long ulong;
 150 typedef unsigned short ushort;
 151
 152 typedef struct {
 153         char c[UTF_SIZ];     /* character code */
 154         uchar mode;  /* attribute flags */
 155         ushort fg;   /* foreground  */
 156         ushort bg;   /* background  */
 157         uchar state; /* state flags    */
 158 } Glyph;
 159
 160 typedef Glyph *Line;
 161
 162 typedef struct {
 163         Glyph attr;      /* current char attributes */
 164         int x;
 165         int y;
 166         char state;
 167 } TCursor;
 168
 169 /* CSI Escape sequence structs */
 170 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 171 typedef struct {
 172         char buf[ESC_BUF_SIZ]; /* raw string */
 173         int len;               /* raw string length */
 174         char priv;
 175         int arg[ESC_ARG_SIZ];
 176         int narg;              /* nb of args */
 177         char mode;
 178 } CSIEscape;
 179
 180 /* STR Escape sequence structs */
 181 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 182 typedef struct {
 183         char type;           /* ESC type ... */
 184         char buf[STR_BUF_SIZ]; /* raw string */
 185         int len;               /* raw string length */
 186         char *args[STR_ARG_SIZ];
 187         int narg;             /* nb of args */
 188 } STREscape;
 189
 190 /* Internal representation of the screen */
 191 typedef struct {
 192         int row;        /* nb row */
 193         int col;        /* nb col */
 194         Line *line;     /* screen */
 195         Line *alt;      /* alternate screen */
 196         bool *dirty;    /* dirtyness of lines */
 197         TCursor c;      /* cursor */
 198         int top;        /* top    scroll limit */
 199         int bot;        /* bottom scroll limit */
 200         int mode;       /* terminal mode flags */
 201         int esc;        /* escape state flags */
 202         bool numlock;   /* lock numbers in keyboard */
 203         bool *tabs;
 204 } Term;
 205
 206 /* Purely graphic info */
 207 typedef struct {
 208         Display *dpy;
 209         Colourmap cmap;
 210         Window win;
 211         Drawable buf;
 212         Atom xembed, wmdeletewin;
 213         XIM xim;
 214         XIC xic;
 215         Draw draw;
 216         Visual *vis;
 217         int scr;
 218         bool isfixed; /* is fixed geometry? */
 219         int fx, fy, fw, fh; /* fixed geometry */
 220         int tw, th; /* tty width and height */
 221         int w, h; /* window width and height */
 222         int ch; /* char height */
 223         int cw; /* char width  */
 224         char state; /* focus, redraw, visible */
 225 } XWindow;
 226
 227 typedef struct {
 228         KeySym k;
 229         uint mask;
 230         char s[ESC_BUF_SIZ];
 231         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 232         signed char appkey;             /* application keypad */
 233         signed char appcursor;          /* application cursor */
 234         signed char crlf;               /* crlf mode          */
 235 } Key;
 236
 237 /* TODO: use better name for vars... */
 238 typedef struct {
 239         int mode;
 240         int type;
 241         int bx, by;
 242         int ex, ey;
 243         struct {
 244                 int x, y;
 245         } b, e;
 246         char *clip;
 247         Atom xtarget;
 248         bool alt;
 249         struct timeval tclick1;
 250         struct timeval tclick2;
 251 } Selection;
 252
 253 typedef union {
 254         int i;
 255         unsigned int ui;
 256         float f;
 257         const void *v;
 258 } Arg;
 259
 260 typedef struct {
 261         unsigned int mod;
 262         KeySym keysym;
 263         void (*func)(const Arg *);
 264         const Arg arg;
 265 } Shortcut;
 266
 267 /* function definitions used in config.h */
 268 static void clippaste(const Arg *);
 269 static void numlock(const Arg *);
 270 static void selpaste(const Arg *);
 271 static void xzoom(const Arg *);
 272
 273 /* Config.h for applying patches and the configuration. */
 274 #include "config.h"
 275
 276 /* Font structure */
 277 typedef struct {
 278         int height;
 279         int width;
 280         int ascent;
 281         int descent;
 282         short lbearing;
 283         short rbearing;
 284         XftFont *match;
 285         FcFontSet *set;
 286         FcPattern *pattern;
 287 } Font;
 288
 289 /* Drawing Context */
 290 typedef struct {
 291         Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 292         Font font, bfont, ifont, ibfont;
 293         GC gc;
 294 } DC;
 295
 296 static void die(const char *, ...);
 297 static void draw(void);
 298 static void redraw(int);
 299 static void drawregion(int, int, int, int);
 300 static void execsh(void);
 301 static void sigchld(int);
 302 static void run(void);
 303
 304 static void csidump(void);
 305 static void csihandle(void);
 306 static void csiparse(void);
 307 static void csireset(void);
 308 static void strdump(void);
 309 static void strhandle(void);
 310 static void strparse(void);
 311 static void strreset(void);
 312
 313 static void tclearregion(int, int, int, int, int);
 314 static void tcursor(int);
 315 static void tdeletechar(int);
 316 static void tdeleteline(int);
 317 static void tinsertblank(int);
 318 static void tinsertblankline(int);
 319 static void tmoveto(int, int);
 320 static void tmoveato(int x, int y);
 321 static void tnew(int, int);
 322 static void tnewline(int);
 323 static void tputtab(bool);
 324 static void tputc(char *, int);
 325 static void treset(void);
 326 static int tresize(int, int);
 327 static void tscrollup(int, int);
 328 static void tscrolldown(int, int);
 329 static void tsetattr(int*, int);
 330 static void tsetchar(char *, Glyph *, int, int);
 331 static void tsetscroll(int, int);
 332 static void tswapscreen(void);
 333 static void tsetdirt(int, int);
 334 static void tsetmode(bool, bool, int *, int);
 335 static void tfulldirt(void);
 336 static void techo(char *, int);
 337
 338 static inline bool match(uint, uint);
 339 static void ttynew(void);
 340 static void ttyread(void);
 341 static void ttyresize(void);
 342 static void ttywrite(const char *, size_t);
 343
 344 static void xdraws(char *, Glyph, int, int, int, int);
 345 static void xhints(void);
 346 static void xclear(int, int, int, int);
 347 static void xdrawcursor(void);
 348 static void xinit(void);
 349 static void xloadcols(void);
 350 static int xsetcolorname(int, const char *);
 351 static int xloadfont(Font *, FcPattern *);
 352 static void xloadfonts(char *, int);
 353 static void xsettitle(char *);
 354 static void xresettitle(void);
 355 static void xseturgency(int);
 356 static void xsetsel(char*);
 357 static void xtermclear(int, int, int, int);
 358 static void xunloadfonts(void);
 359 static void xresize(int, int);
 360
 361 static void expose(XEvent *);
 362 static void visibility(XEvent *);
 363 static void unmap(XEvent *);
 364 static char *kmap(KeySym, uint);
 365 static void kpress(XEvent *);
 366 static void cmessage(XEvent *);
 367 static void cresize(int, int);
 368 static void resize(XEvent *);
 369 static void focus(XEvent *);
 370 static void brelease(XEvent *);
 371 static void bpress(XEvent *);
 372 static void bmotion(XEvent *);
 373 static void selnotify(XEvent *);
 374 static void selclear(XEvent *);
 375 static void selrequest(XEvent *);
 376
 377 static void selinit(void);
 378 static inline bool selected(int, int);
 379 static void selcopy(void);
 380 static void selscroll(int, int);
 381
 382 static int utf8decode(char *, long *);
 383 static int utf8encode(long *, char *);
 384 static int utf8size(char *);
 385 static int isfullutf8(char *, int);
 386
 387 static ssize_t xwrite(int, char *, size_t);
 388 static void *xmalloc(size_t);
 389 static void *xrealloc(void *, size_t);
 390 static void *xcalloc(size_t, size_t);
 391
 392 static void (*handler[LASTEvent])(XEvent *) = {
 393         [KeyPress] = kpress,
 394         [ClientMessage] = cmessage,
 395         [ConfigureNotify] = resize,
 396         [VisibilityNotify] = visibility,
 397         [UnmapNotify] = unmap,
 398         [Expose] = expose,
 399         [FocusIn] = focus,
 400         [FocusOut] = focus,
 401         [MotionNotify] = bmotion,
 402         [ButtonPress] = bpress,
 403         [ButtonRelease] = brelease,
 404         [SelectionClear] = selclear,
 405         [SelectionNotify] = selnotify,
 406         [SelectionRequest] = selrequest,
 407 };
 408
 409 /* Globals */
 410 static DC dc;
 411 static XWindow xw;
 412 static Term term;
 413 static CSIEscape csiescseq;
 414 static STREscape strescseq;
 415 static int cmdfd;
 416 static pid_t pid;
 417 static Selection sel;
 418 static int iofd = -1;
 419 static char **opt_cmd = NULL;
 420 static char *opt_io = NULL;
 421 static char *opt_title = NULL;
 422 static char *opt_embed = NULL;
 423 static char *opt_class = NULL;
 424 static char *opt_font = NULL;
 425
 426 static char *usedfont = NULL;
 427 static int usedfontsize = 0;
 428
 429 /* Font Ring Cache */
 430 enum {
 431         FRC_NORMAL,
 432         FRC_ITALIC,
 433         FRC_BOLD,
 434         FRC_ITALICBOLD
 435 };
 436
 437 typedef struct {
 438         XftFont *font;
 439         long c;
 440         int flags;
 441 } Fontcache;
 442
 443 /*
 444  * Fontcache is a ring buffer, with frccur as current position and frclen as
 445  * the current length of used elements.
 446  */
 447
 448 static Fontcache frc[1024];
 449 static int frccur = -1, frclen = 0;
 450
 451 ssize_t
 452 xwrite(int fd, char *s, size_t len) {
 453         size_t aux = len;
 454
 455         while(len > 0) {
 456                 ssize_t r = write(fd, s, len);
 457                 if(r < 0)
 458                         return r;
 459                 len -= r;
 460                 s += r;
 461         }
 462         return aux;
 463 }
 464
 465 void *
 466 xmalloc(size_t len) {
 467         void *p = malloc(len);
 468
 469         if(!p)
 470                 die("Out of memory\n");
 471
 472         return p;
 473 }
 474
 475 void *
 476 xrealloc(void *p, size_t len) {
 477         if((p = realloc(p, len)) == NULL)
 478                 die("Out of memory\n");
 479
 480         return p;
 481 }
 482
 483 void *
 484 xcalloc(size_t nmemb, size_t size) {
 485         void *p = calloc(nmemb, size);
 486
 487         if(!p)
 488                 die("Out of memory\n");
 489
 490         return p;
 491 }
 492
 493 int
 494 utf8decode(char *s, long *u) {
 495         uchar c;
 496         int i, n, rtn;
 497
 498         rtn = 1;
 499         c = *s;
 500         if(~c & B7) { /* 0xxxxxxx */
 501                 *u = c;
 502                 return rtn;
 503         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 504                 *u = c&(B4|B3|B2|B1|B0);
 505                 n = 1;
 506         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 507                 *u = c&(B3|B2|B1|B0);
 508                 n = 2;
 509         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 510                 *u = c & (B2|B1|B0);
 511                 n = 3;
 512         } else {
 513                 goto invalid;
 514         }
 515
 516         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 517                 c = *s;
 518                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 519                         goto invalid;
 520                 *u <<= 6;
 521                 *u |= c & (B5|B4|B3|B2|B1|B0);
 522         }
 523
 524         if((n == 1 && *u < 0x80) ||
 525            (n == 2 && *u < 0x800) ||
 526            (n == 3 && *u < 0x10000) ||
 527            (*u >= 0xD800 && *u <= 0xDFFF)) {
 528                 goto invalid;
 529         }
 530
 531         return rtn;
 532 invalid:
 533         *u = 0xFFFD;
 534
 535         return rtn;
 536 }
 537
 538 int
 539 utf8encode(long *u, char *s) {
 540         uchar *sp;
 541         ulong uc;
 542         int i, n;
 543
 544         sp = (uchar *)s;
 545         uc = *u;
 546         if(uc < 0x80) {
 547                 *sp = uc; /* 0xxxxxxx */
 548                 return 1;
 549         } else if(*u < 0x800) {
 550                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 551                 n = 1;
 552         } else if(uc < 0x10000) {
 553                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 554                 n = 2;
 555         } else if(uc <= 0x10FFFF) {
 556                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 557                 n = 3;
 558         } else {
 559                 goto invalid;
 560         }
 561
 562         for(i=n,++sp; i>0; --i,++sp)
 563                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 564
 565         return n+1;
 566 invalid:
 567         /* U+FFFD */
 568         *s++ = '\xEF';
 569         *s++ = '\xBF';
 570         *s = '\xBD';
 571
 572         return 3;
 573 }
 574
 575 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 576    UTF-8 otherwise return 0 */
 577 int
 578 isfullutf8(char *s, int b) {
 579         uchar *c1, *c2, *c3;
 580
 581         c1 = (uchar *)s;
 582         c2 = (uchar *)++s;
 583         c3 = (uchar *)++s;
 584         if(b < 1) {
 585                 return 0;
 586         } else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1) {
 587                 return 0;
 588         } else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 589             ((b == 1) ||
 590             ((b == 2) && (*c2&(B7|B6)) == B7))) {
 591                 return 0;
 592         } else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 593             ((b == 1) ||
 594             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 595             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7))) {
 596                 return 0;
 597         } else {
 598                 return 1;
 599         }
 600 }
 601
 602 int
 603 utf8size(char *s) {
 604         uchar c = *s;
 605
 606         if(~c&B7) {
 607                 return 1;
 608         } else if((c&(B7|B6|B5)) == (B7|B6)) {
 609                 return 2;
 610         } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) {
 611                 return 3;
 612         } else {
 613                 return 4;
 614         }
 615 }
 616
 617 void
 618 selinit(void) {
 619         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 620         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 621         sel.mode = 0;
 622         sel.bx = -1;
 623         sel.clip = NULL;
 624         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 625         if(sel.xtarget == None)
 626                 sel.xtarget = XA_STRING;
 627 }
 628
 629 static int
 630 x2col(int x) {
 631         x -= borderpx;
 632         x /= xw.cw;
 633
 634         return LIMIT(x, 0, term.col-1);
 635 }
 636
 637 static int
 638 y2row(int y) {
 639         y -= borderpx;
 640         y /= xw.ch;
 641
 642         return LIMIT(y, 0, term.row-1);
 643 }
 644
 645 static inline bool
 646 selected(int x, int y) {
 647         int bx, ex;
 648
 649         if(sel.ey == y && sel.by == y) {
 650                 bx = MIN(sel.bx, sel.ex);
 651                 ex = MAX(sel.bx, sel.ex);
 652
 653                 return BETWEEN(x, bx, ex);
 654         }
 655
 656         if(sel.type == SEL_RECTANGULAR) {
 657                 return ((sel.b.y <= y && y <= sel.e.y)
 658                         && (sel.b.x <= x && x <= sel.e.x));
 659         }
 660         return ((sel.b.y < y && y < sel.e.y)
 661                 || (y == sel.e.y && x <= sel.e.x))
 662                 || (y == sel.b.y && x >= sel.b.x
 663                         && (x <= sel.e.x || sel.b.y != sel.e.y));
 664 }
 665
 666 void
 667 getbuttoninfo(XEvent *e) {
 668         int type;
 669         uint state = e->xbutton.state &~Button1Mask;
 670
 671         sel.alt = IS_SET(MODE_ALTSCREEN);
 672
 673         sel.ex = x2col(e->xbutton.x);
 674         sel.ey = y2row(e->xbutton.y);
 675
 676         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 677         sel.b.y = MIN(sel.by, sel.ey);
 678         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 679         sel.e.y = MAX(sel.by, sel.ey);
 680
 681         sel.type = SEL_REGULAR;
 682         for(type = 1; type < LEN(selmasks); ++type) {
 683                 if(match(selmasks[type], state)) {
 684                         sel.type = type;
 685                         break;
 686                 }
 687         }
 688 }
 689
 690 void
 691 mousereport(XEvent *e) {
 692         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 693             button = e->xbutton.button, state = e->xbutton.state,
 694             len;
 695         char buf[40];
 696         static int ob, ox, oy;
 697
 698         /* from urxvt */
 699         if(e->xbutton.type == MotionNotify) {
 700                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 701                         return;
 702                 button = ob + 32;
 703                 ox = x, oy = y;
 704         } else if(!IS_SET(MODE_MOUSESGR)
 705                         && (e->xbutton.type == ButtonRelease
 706                                 || button == AnyButton)) {
 707                 button = 3;
 708         } else {
 709                 button -= Button1;
 710                 if(button >= 3)
 711                         button += 64 - 3;
 712                 if(e->xbutton.type == ButtonPress) {
 713                         ob = button;
 714                         ox = x, oy = y;
 715                 }
 716         }
 717
 718         button += (state & ShiftMask   ? 4  : 0)
 719                 + (state & Mod4Mask    ? 8  : 0)
 720                 + (state & ControlMask ? 16 : 0);
 721
 722         len = 0;
 723         if(IS_SET(MODE_MOUSESGR)) {
 724                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 725                                 button, x+1, y+1,
 726                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 727         } else if(x < 223 && y < 223) {
 728                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 729                                 32+button, 32+x+1, 32+y+1);
 730         } else {
 731                 return;
 732         }
 733
 734         ttywrite(buf, len);
 735 }
 736
 737 void
 738 bpress(XEvent *e) {
 739         if(IS_SET(MODE_MOUSE)) {
 740                 mousereport(e);
 741         } else if(e->xbutton.button == Button1) {
 742                 if(sel.bx != -1) {
 743                         sel.bx = -1;
 744                         tsetdirt(sel.b.y, sel.e.y);
 745                         draw();
 746                 }
 747                 sel.mode = 1;
 748                 sel.type = SEL_REGULAR;
 749                 sel.ex = sel.bx = x2col(e->xbutton.x);
 750                 sel.ey = sel.by = y2row(e->xbutton.y);
 751         } else if(e->xbutton.button == Button4) {
 752                 ttywrite("\031", 1);
 753         } else if(e->xbutton.button == Button5) {
 754                 ttywrite("\005", 1);
 755         }
 756 }
 757
 758 void
 759 selcopy(void) {
 760         char *str, *ptr, *p;
 761         int x, y, bufsize, isselected = 0, size;
 762         Glyph *gp, *last;
 763
 764         if(sel.bx == -1) {
 765                 str = NULL;
 766         } else {
 767                 bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 768                 ptr = str = xmalloc(bufsize);
 769
 770                 /* append every set & selected glyph to the selection */
 771                 for(y = sel.b.y; y < sel.e.y + 1; y++) {
 772                         isselected = 0;
 773                         gp = &term.line[y][0];
 774                         last = gp + term.col;
 775
 776                         while(--last >= gp && !(last->state & GLYPH_SET))
 777                                 /* nothing */;
 778
 779                         for(x = 0; gp <= last; x++, ++gp) {
 780                                 if(!selected(x, y)) {
 781                                         continue;
 782                                 } else {
 783                                         isselected = 1;
 784                                 }
 785
 786                                 p = (gp->state & GLYPH_SET) ? gp->c : " ";
 787                                 size = utf8size(p);
 788                                 memcpy(ptr, p, size);
 789                                 ptr += size;
 790                         }
 791
 792                         /*
 793                          * Copy and pasting of line endings is inconsistent
 794                          * in the inconsistent terminal and GUI world.
 795                          * The best solution seems like to produce '\n' when
 796                          * something is copied from st and convert '\n' to
 797                          * '\r', when something to be pasted is received by
 798                          * st.
 799                          * FIXME: Fix the computer world.
 800                          */
 801                         if(isselected && y < sel.e.y)
 802                                 *ptr++ = '\n';
 803                 }
 804                 *ptr = 0;
 805         }
 806         xsetsel(str);
 807 }
 808
 809 void
 810 selnotify(XEvent *e) {
 811         ulong nitems, ofs, rem;
 812         int format;
 813         uchar *data, *last, *repl;
 814         Atom type;
 815
 816         ofs = 0;
 817         do {
 818                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 819                                         False, AnyPropertyType, &type, &format,
 820                                         &nitems, &rem, &data)) {
 821                         fprintf(stderr, "Clipboard allocation failed\n");
 822                         return;
 823                 }
 824
 825                 /*
 826                  * As seen in selcopy:
 827                  * Line endings are inconsistent in the terminal and GUI world
 828                  * copy and pasting. When receiving some selection data,
 829                  * replace all '\n' with '\r'.
 830                  * FIXME: Fix the computer world.
 831                  */
 832                 repl = data;
 833                 last = data + nitems * format / 8;
 834                 while((repl = memchr(repl, '\n', last - repl))) {
 835                         *repl++ = '\r';
 836                 }
 837
 838                 ttywrite((const char *)data, nitems * format / 8);
 839                 XFree(data);
 840                 /* number of 32-bit chunks returned */
 841                 ofs += nitems * format / 32;
 842         } while(rem > 0);
 843 }
 844
 845 void
 846 selpaste(const Arg *dummy) {
 847         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
 848                         xw.win, CurrentTime);
 849 }
 850
 851 void
 852 clippaste(const Arg *dummy) {
 853         Atom clipboard;
 854
 855         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 856         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
 857                         xw.win, CurrentTime);
 858 }
 859
 860 void
 861 selclear(XEvent *e) {
 862         if(sel.bx == -1)
 863                 return;
 864         sel.bx = -1;
 865         tsetdirt(sel.b.y, sel.e.y);
 866 }
 867
 868 void
 869 selrequest(XEvent *e) {
 870         XSelectionRequestEvent *xsre;
 871         XSelectionEvent xev;
 872         Atom xa_targets, string;
 873
 874         xsre = (XSelectionRequestEvent *) e;
 875         xev.type = SelectionNotify;
 876         xev.requestor = xsre->requestor;
 877         xev.selection = xsre->selection;
 878         xev.target = xsre->target;
 879         xev.time = xsre->time;
 880         /* reject */
 881         xev.property = None;
 882
 883         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 884         if(xsre->target == xa_targets) {
 885                 /* respond with the supported type */
 886                 string = sel.xtarget;
 887                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 888                                 XA_ATOM, 32, PropModeReplace,
 889                                 (uchar *) &string, 1);
 890                 xev.property = xsre->property;
 891         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 892                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 893                                 xsre->target, 8, PropModeReplace,
 894                                 (uchar *) sel.clip, strlen(sel.clip));
 895                 xev.property = xsre->property;
 896         }
 897
 898         /* all done, send a notification to the listener */
 899         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 900                 fprintf(stderr, "Error sending SelectionNotify event\n");
 901 }
 902
 903 void
 904 xsetsel(char *str) {
 905         /* register the selection for both the clipboard and the primary */
 906         Atom clipboard;
 907
 908         free(sel.clip);
 909         sel.clip = str;
 910
 911         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 912
 913         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 914         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 915 }
 916
 917 void
 918 brelease(XEvent *e) {
 919         struct timeval now;
 920
 921         if(IS_SET(MODE_MOUSE)) {
 922                 mousereport(e);
 923                 return;
 924         }
 925
 926         if(e->xbutton.button == Button2) {
 927                 selpaste(NULL);
 928         } else if(e->xbutton.button == Button1) {
 929                 sel.mode = 0;
 930                 getbuttoninfo(e);
 931                 term.dirty[sel.ey] = 1;
 932                 if(sel.bx == sel.ex && sel.by == sel.ey) {
 933                         sel.bx = -1;
 934                         gettimeofday(&now, NULL);
 935
 936                         if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 937                                 /* triple click on the line */
 938                                 sel.b.x = sel.bx = 0;
 939                                 sel.e.x = sel.ex = term.col;
 940                                 sel.b.y = sel.e.y = sel.ey;
 941                                 selcopy();
 942                         } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 943                                 /* double click to select word */
 944                                 sel.bx = sel.ex;
 945                                 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
 946                                                 term.line[sel.ey][sel.bx-1].c[0] != ' ') {
 947                                         sel.bx--;
 948                                 }
 949                                 sel.b.x = sel.bx;
 950                                 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
 951                                                 term.line[sel.ey][sel.ex+1].c[0] != ' ') {
 952                                         sel.ex++;
 953                                 }
 954                                 sel.e.x = sel.ex;
 955                                 sel.b.y = sel.e.y = sel.ey;
 956                                 selcopy();
 957                         }
 958                 } else {
 959                         selcopy();
 960                 }
 961         }
 962
 963         memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
 964         gettimeofday(&sel.tclick1, NULL);
 965 }
 966
 967 void
 968 bmotion(XEvent *e) {
 969         int oldey, oldex, oldsby, oldsey;
 970
 971         if(IS_SET(MODE_MOUSE)) {
 972                 mousereport(e);
 973                 return;
 974         }
 975
 976         if(!sel.mode)
 977                 return;
 978
 979         oldey = sel.ey;
 980         oldex = sel.ex;
 981         oldsby = sel.b.y;
 982         oldsey = sel.e.y;
 983         getbuttoninfo(e);
 984
 985         if(oldey != sel.ey || oldex != sel.ex) {
 986                 tsetdirt(MIN(sel.b.y, oldsby), MAX(sel.e.y, oldsey));
 987         }
 988 }
 989
 990 void
 991 die(const char *errstr, ...) {
 992         va_list ap;
 993
 994         va_start(ap, errstr);
 995         vfprintf(stderr, errstr, ap);
 996         va_end(ap);
 997         exit(EXIT_FAILURE);
 998 }
 999
1000 void
1001 execsh(void) {
1002         char **args;
1003         char *envshell = getenv("SHELL");
1004         const struct passwd *pass = getpwuid(getuid());
1005         char buf[sizeof(long) * 8 + 1];
1006
1007         unsetenv("COLUMNS");
1008         unsetenv("LINES");
1009         unsetenv("TERMCAP");
1010
1011         if(pass) {
1012                 setenv("LOGNAME", pass->pw_name, 1);
1013                 setenv("USER", pass->pw_name, 1);
1014                 setenv("SHELL", pass->pw_shell, 0);
1015                 setenv("HOME", pass->pw_dir, 0);
1016         }
1017
1018         snprintf(buf, sizeof(buf), "%lu", xw.win);
1019         setenv("WINDOWID", buf, 1);
1020
1021         signal(SIGCHLD, SIG_DFL);
1022         signal(SIGHUP, SIG_DFL);
1023         signal(SIGINT, SIG_DFL);
1024         signal(SIGQUIT, SIG_DFL);
1025         signal(SIGTERM, SIG_DFL);
1026         signal(SIGALRM, SIG_DFL);
1027
1028         DEFAULT(envshell, shell);
1029         setenv("TERM", termname, 1);
1030         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1031         execvp(args[0], args);
1032         exit(EXIT_FAILURE);
1033 }
1034
1035 void
1036 sigchld(int a) {
1037         int stat = 0;
1038
1039         if(waitpid(pid, &stat, 0) < 0)
1040                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
1041
1042         if(WIFEXITED(stat)) {
1043                 exit(WEXITSTATUS(stat));
1044         } else {
1045                 exit(EXIT_FAILURE);
1046         }
1047 }
1048
1049 void
1050 ttynew(void) {
1051         int m, s;
1052         struct winsize w = {term.row, term.col, 0, 0};
1053
1054         /* seems to work fine on linux, openbsd and freebsd */
1055         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1056                 die("openpty failed: %s\n", SERRNO);
1057
1058         switch(pid = fork()) {
1059         case -1:
1060                 die("fork failed\n");
1061                 break;
1062         case 0:
1063                 setsid(); /* create a new process group */
1064                 dup2(s, STDIN_FILENO);
1065                 dup2(s, STDOUT_FILENO);
1066                 dup2(s, STDERR_FILENO);
1067                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1068                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
1069                 close(s);
1070                 close(m);
1071                 execsh();
1072                 break;
1073         default:
1074                 close(s);
1075                 cmdfd = m;
1076                 signal(SIGCHLD, sigchld);
1077                 if(opt_io) {
1078                         iofd = (!strcmp(opt_io, "-")) ?
1079                                   STDOUT_FILENO :
1080                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1081                         if(iofd < 0) {
1082                                 fprintf(stderr, "Error opening %s:%s\n",
1083                                         opt_io, strerror(errno));
1084                         }
1085                 }
1086         }
1087 }
1088
1089 void
1090 dump(char c) {
1091         static int col;
1092
1093         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
1094         if(++col % 10 == 0)
1095                 fprintf(stderr, "\n");
1096 }
1097
1098 void
1099 ttyread(void) {
1100         static char buf[BUFSIZ];
1101         static int buflen = 0;
1102         char *ptr;
1103         char s[UTF_SIZ];
1104         int charsize; /* size of utf8 char in bytes */
1105         long utf8c;
1106         int ret;
1107
1108         /* append read bytes to unprocessed bytes */
1109         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1110                 die("Couldn't read from shell: %s\n", SERRNO);
1111
1112         /* process every complete utf8 char */
1113         buflen += ret;
1114         ptr = buf;
1115         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
1116                 charsize = utf8decode(ptr, &utf8c);
1117                 utf8encode(&utf8c, s);
1118                 tputc(s, charsize);
1119                 ptr += charsize;
1120                 buflen -= charsize;
1121         }
1122
1123         /* keep any uncomplete utf8 char for the next call */
1124         memmove(buf, ptr, buflen);
1125 }
1126
1127 void
1128 ttywrite(const char *s, size_t n) {
1129         if(write(cmdfd, s, n) == -1)
1130                 die("write error on tty: %s\n", SERRNO);
1131 }
1132
1133 void
1134 ttyresize(void) {
1135         struct winsize w;
1136
1137         w.ws_row = term.row;
1138         w.ws_col = term.col;
1139         w.ws_xpixel = xw.tw;
1140         w.ws_ypixel = xw.th;
1141         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1142                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
1143 }
1144
1145 void
1146 tsetdirt(int top, int bot) {
1147         int i;
1148
1149         LIMIT(top, 0, term.row-1);
1150         LIMIT(bot, 0, term.row-1);
1151
1152         for(i = top; i <= bot; i++)
1153                 term.dirty[i] = 1;
1154 }
1155
1156 void
1157 tfulldirt(void) {
1158         tsetdirt(0, term.row-1);
1159 }
1160
1161 void
1162 tcursor(int mode) {
1163         static TCursor c;
1164
1165         if(mode == CURSOR_SAVE) {
1166                 c = term.c;
1167         } else if(mode == CURSOR_LOAD) {
1168                 term.c = c;
1169                 tmoveto(c.x, c.y);
1170         }
1171 }
1172
1173 void
1174 treset(void) {
1175         uint i;
1176
1177         term.c = (TCursor){{
1178                 .mode = ATTR_NULL,
1179                 .fg = defaultfg,
1180                 .bg = defaultbg
1181         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1182
1183         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1184         for(i = tabspaces; i < term.col; i += tabspaces)
1185                 term.tabs[i] = 1;
1186         term.top = 0;
1187         term.bot = term.row - 1;
1188         term.mode = MODE_WRAP;
1189
1190         tclearregion(0, 0, term.col-1, term.row-1, 0);
1191         tmoveto(0, 0);
1192         tcursor(CURSOR_SAVE);
1193 }
1194
1195 void
1196 tnew(int col, int row) {
1197         /* set screen size */
1198         term.row = row;
1199         term.col = col;
1200         term.line = xmalloc(term.row * sizeof(Line));
1201         term.alt  = xmalloc(term.row * sizeof(Line));
1202         term.dirty = xmalloc(term.row * sizeof(*term.dirty));
1203         term.tabs = xmalloc(term.col * sizeof(*term.tabs));
1204
1205         for(row = 0; row < term.row; row++) {
1206                 term.line[row] = xmalloc(term.col * sizeof(Glyph));
1207                 term.alt [row] = xmalloc(term.col * sizeof(Glyph));
1208                 term.dirty[row] = 0;
1209         }
1210
1211         term.numlock = 1;
1212         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1213         /* setup screen */
1214         treset();
1215 }
1216
1217 void
1218 tswapscreen(void) {
1219         Line *tmp = term.line;
1220
1221         term.line = term.alt;
1222         term.alt = tmp;
1223         term.mode ^= MODE_ALTSCREEN;
1224         tfulldirt();
1225 }
1226
1227 void
1228 tscrolldown(int orig, int n) {
1229         int i;
1230         Line temp;
1231
1232         LIMIT(n, 0, term.bot-orig+1);
1233
1234         tclearregion(0, term.bot-n+1, term.col-1, term.bot, 0);
1235
1236         for(i = term.bot; i >= orig+n; i--) {
1237                 temp = term.line[i];
1238                 term.line[i] = term.line[i-n];
1239                 term.line[i-n] = temp;
1240
1241                 term.dirty[i] = 1;
1242                 term.dirty[i-n] = 1;
1243         }
1244
1245         selscroll(orig, n);
1246 }
1247
1248 void
1249 tscrollup(int orig, int n) {
1250         int i;
1251         Line temp;
1252         LIMIT(n, 0, term.bot-orig+1);
1253
1254         tclearregion(0, orig, term.col-1, orig+n-1, 0);
1255
1256         for(i = orig; i <= term.bot-n; i++) {
1257                  temp = term.line[i];
1258                  term.line[i] = term.line[i+n];
1259                  term.line[i+n] = temp;
1260
1261                  term.dirty[i] = 1;
1262                  term.dirty[i+n] = 1;
1263         }
1264
1265         selscroll(orig, -n);
1266 }
1267
1268 void
1269 selscroll(int orig, int n) {
1270         if(sel.bx == -1)
1271                 return;
1272
1273         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
1274                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
1275                         sel.bx = -1;
1276                         return;
1277                 }
1278                 if(sel.type == SEL_RECTANGULAR) {
1279                         if(sel.by < term.top)
1280                                 sel.by = term.top;
1281                         if(sel.ey > term.bot)
1282                                 sel.ey = term.bot;
1283                 } else {
1284                         if(sel.by < term.top) {
1285                                 sel.by = term.top;
1286                                 sel.bx = 0;
1287                         }
1288                         if(sel.ey > term.bot) {
1289                                 sel.ey = term.bot;
1290                                 sel.ex = term.col;
1291                         }
1292                 }
1293                 sel.b.y = sel.by, sel.b.x = sel.bx;
1294                 sel.e.y = sel.ey, sel.e.x = sel.ex;
1295         }
1296 }
1297
1298 void
1299 tnewline(int first_col) {
1300         int y = term.c.y;
1301
1302         if(y == term.bot) {
1303                 tscrollup(term.top, 1);
1304         } else {
1305                 y++;
1306         }
1307         tmoveto(first_col ? 0 : term.c.x, y);
1308 }
1309
1310 void
1311 csiparse(void) {
1312         char *p = csiescseq.buf, *np;
1313         long int v;
1314
1315         csiescseq.narg = 0;
1316         if(*p == '?') {
1317                 csiescseq.priv = 1;
1318                 p++;
1319         }
1320
1321         csiescseq.buf[csiescseq.len] = '\0';
1322         while(p < csiescseq.buf+csiescseq.len) {
1323                 np = NULL;
1324                 v = strtol(p, &np, 10);
1325                 if(np == p)
1326                         v = 0;
1327                 if(v == LONG_MAX || v == LONG_MIN)
1328                         v = -1;
1329                 csiescseq.arg[csiescseq.narg++] = v;
1330                 p = np;
1331                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1332                         break;
1333                 p++;
1334         }
1335         csiescseq.mode = *p;
1336 }
1337
1338 /* for absolute user moves, when decom is set */
1339 void
1340 tmoveato(int x, int y) {
1341         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1342 }
1343
1344 void
1345 tmoveto(int x, int y) {
1346         int miny, maxy;
1347
1348         if(term.c.state & CURSOR_ORIGIN) {
1349                 miny = term.top;
1350                 maxy = term.bot;
1351         } else {
1352                 miny = 0;
1353                 maxy = term.row - 1;
1354         }
1355         LIMIT(x, 0, term.col-1);
1356         LIMIT(y, miny, maxy);
1357         term.c.state &= ~CURSOR_WRAPNEXT;
1358         term.c.x = x;
1359         term.c.y = y;
1360 }
1361
1362 void
1363 tsetchar(char *c, Glyph *attr, int x, int y) {
1364         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1365                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1366                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1367                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1368                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1369                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1370                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1371                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1372                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1373         };
1374
1375         /*
1376          * The table is proudly stolen from rxvt.
1377          */
1378         if(attr->mode & ATTR_GFX) {
1379                 if(c[0] >= 0x41 && c[0] <= 0x7e
1380                                 && vt100_0[c[0] - 0x41]) {
1381                         c = vt100_0[c[0] - 0x41];
1382                 }
1383         }
1384
1385         term.dirty[y] = 1;
1386         term.line[y][x] = *attr;
1387         memcpy(term.line[y][x].c, c, UTF_SIZ);
1388         term.line[y][x].state |= GLYPH_SET;
1389 }
1390
1391 void
1392 tclearregion(int x1, int y1, int x2, int y2, int bce) {
1393         int x, y, temp;
1394
1395         if(x1 > x2)
1396                 temp = x1, x1 = x2, x2 = temp;
1397         if(y1 > y2)
1398                 temp = y1, y1 = y2, y2 = temp;
1399
1400         LIMIT(x1, 0, term.col-1);
1401         LIMIT(x2, 0, term.col-1);
1402         LIMIT(y1, 0, term.row-1);
1403         LIMIT(y2, 0, term.row-1);
1404
1405         for(y = y1; y <= y2; y++) {
1406                 term.dirty[y] = 1;
1407                 for(x = x1; x <= x2; x++) {
1408                         if(bce) {
1409                                 term.line[y][x] = term.c.attr;
1410                                 memcpy(term.line[y][x].c, " ", 2);
1411                                 term.line[y][x].state |= GLYPH_SET;
1412                         } else {
1413                                 term.line[y][x].state = 0;
1414                         }
1415                 }
1416         }
1417 }
1418
1419 void
1420 tdeletechar(int n) {
1421         int src = term.c.x + n;
1422         int dst = term.c.x;
1423         int size = term.col - src;
1424
1425         term.dirty[term.c.y] = 1;
1426
1427         if(src >= term.col) {
1428                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y, 0);
1429                 return;
1430         }
1431
1432         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1433                         size * sizeof(Glyph));
1434         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y, 0);
1435 }
1436
1437 void
1438 tinsertblank(int n) {
1439         int src = term.c.x;
1440         int dst = src + n;
1441         int size = term.col - dst;
1442
1443         term.dirty[term.c.y] = 1;
1444
1445         if(dst >= term.col) {
1446                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y, 0);
1447                 return;
1448         }
1449
1450         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1451                         size * sizeof(Glyph));
1452         tclearregion(src, term.c.y, dst - 1, term.c.y, 0);
1453 }
1454
1455 void
1456 tinsertblankline(int n) {
1457         if(term.c.y < term.top || term.c.y > term.bot)
1458                 return;
1459
1460         tscrolldown(term.c.y, n);
1461 }
1462
1463 void
1464 tdeleteline(int n) {
1465         if(term.c.y < term.top || term.c.y > term.bot)
1466                 return;
1467
1468         tscrollup(term.c.y, n);
1469 }
1470
1471 void
1472 tsetattr(int *attr, int l) {
1473         int i;
1474
1475         for(i = 0; i < l; i++) {
1476                 switch(attr[i]) {
1477                 case 0:
1478                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD \
1479                                         | ATTR_ITALIC | ATTR_BLINK);
1480                         term.c.attr.fg = defaultfg;
1481                         term.c.attr.bg = defaultbg;
1482                         break;
1483                 case 1:
1484                         term.c.attr.mode |= ATTR_BOLD;
1485                         break;
1486                 case 3:
1487                         term.c.attr.mode |= ATTR_ITALIC;
1488                         break;
1489                 case 4:
1490                         term.c.attr.mode |= ATTR_UNDERLINE;
1491                         break;
1492                 case 5: /* slow blink */
1493                 case 6: /* rapid blink */
1494                         term.c.attr.mode |= ATTR_BLINK;
1495                         break;
1496                 case 7:
1497                         term.c.attr.mode |= ATTR_REVERSE;
1498                         break;
1499                 case 21:
1500                 case 22:
1501                         term.c.attr.mode &= ~ATTR_BOLD;
1502                         break;
1503                 case 23:
1504                         term.c.attr.mode &= ~ATTR_ITALIC;
1505                         break;
1506                 case 24:
1507                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1508                         break;
1509                 case 25:
1510                 case 26:
1511                         term.c.attr.mode &= ~ATTR_BLINK;
1512                         break;
1513                 case 27:
1514                         term.c.attr.mode &= ~ATTR_REVERSE;
1515                         break;
1516                 case 38:
1517                         if(i + 2 < l && attr[i + 1] == 5) {
1518                                 i += 2;
1519                                 if(BETWEEN(attr[i], 0, 255)) {
1520                                         term.c.attr.fg = attr[i];
1521                                 } else {
1522                                         fprintf(stderr,
1523                                                 "erresc: bad fgcolor %d\n",
1524                                                 attr[i]);
1525                                 }
1526                         } else {
1527                                 fprintf(stderr,
1528                                         "erresc(38): gfx attr %d unknown\n",
1529                                         attr[i]);
1530                         }
1531                         break;
1532                 case 39:
1533                         term.c.attr.fg = defaultfg;
1534                         break;
1535                 case 48:
1536                         if(i + 2 < l && attr[i + 1] == 5) {
1537                                 i += 2;
1538                                 if(BETWEEN(attr[i], 0, 255)) {
1539                                         term.c.attr.bg = attr[i];
1540                                 } else {
1541                                         fprintf(stderr,
1542                                                 "erresc: bad bgcolor %d\n",
1543                                                 attr[i]);
1544                                 }
1545                         } else {
1546                                 fprintf(stderr,
1547                                         "erresc(48): gfx attr %d unknown\n",
1548                                         attr[i]);
1549                         }
1550                         break;
1551                 case 49:
1552                         term.c.attr.bg = defaultbg;
1553                         break;
1554                 default:
1555                         if(BETWEEN(attr[i], 30, 37)) {
1556                                 term.c.attr.fg = attr[i] - 30;
1557                         } else if(BETWEEN(attr[i], 40, 47)) {
1558                                 term.c.attr.bg = attr[i] - 40;
1559                         } else if(BETWEEN(attr[i], 90, 97)) {
1560                                 term.c.attr.fg = attr[i] - 90 + 8;
1561                         } else if(BETWEEN(attr[i], 100, 107)) {
1562                                 term.c.attr.bg = attr[i] - 100 + 8;
1563                         } else {
1564                                 fprintf(stderr,
1565                                         "erresc(default): gfx attr %d unknown\n",
1566                                         attr[i]), csidump();
1567                         }
1568                         break;
1569                 }
1570         }
1571 }
1572
1573 void
1574 tsetscroll(int t, int b) {
1575         int temp;
1576
1577         LIMIT(t, 0, term.row-1);
1578         LIMIT(b, 0, term.row-1);
1579         if(t > b) {
1580                 temp = t;
1581                 t = b;
1582                 b = temp;
1583         }
1584         term.top = t;
1585         term.bot = b;
1586 }
1587
1588 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1589
1590 void
1591 tsetmode(bool priv, bool set, int *args, int narg) {
1592         int *lim, mode;
1593         bool alt;
1594
1595         for(lim = args + narg; args < lim; ++args) {
1596                 if(priv) {
1597                         switch(*args) {
1598                                 break;
1599                         case 1: /* DECCKM -- Cursor key */
1600                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1601                                 break;
1602                         case 5: /* DECSCNM -- Reverse video */
1603                                 mode = term.mode;
1604                                 MODBIT(term.mode, set, MODE_REVERSE);
1605                                 if(mode != term.mode)
1606                                         redraw(REDRAW_TIMEOUT);
1607                                 break;
1608                         case 6: /* DECOM -- Origin */
1609                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1610                                 tmoveato(0, 0);
1611                                 break;
1612                         case 7: /* DECAWM -- Auto wrap */
1613                                 MODBIT(term.mode, set, MODE_WRAP);
1614                                 break;
1615                         case 0:  /* Error (IGNORED) */
1616                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1617                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1618                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1619                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1620                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1621                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1622                         case 42: /* DECNRCM -- National characters (IGNORED) */
1623                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1624                                 break;
1625                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1626                                 MODBIT(term.mode, !set, MODE_HIDE);
1627                                 break;
1628                         case 1000: /* 1000,1002: enable xterm mouse report */
1629                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1630                                 MODBIT(term.mode, 0, MODE_MOUSEMOTION);
1631                                 break;
1632                         case 1002:
1633                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1634                                 MODBIT(term.mode, 0, MODE_MOUSEBTN);
1635                                 break;
1636                         case 1006:
1637                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1638                                 break;
1639                         case 1049: /* = 1047 and 1048 */
1640                         case 47:
1641                         case 1047:
1642                                 if (!allowaltscreen)
1643                                         break;
1644
1645                                 alt = IS_SET(MODE_ALTSCREEN);
1646                                 if(alt) {
1647                                         tclearregion(0, 0, term.col-1,
1648                                                         term.row-1, 0);
1649                                 }
1650                                 if(set ^ alt)           /* set is always 1 or 0 */
1651                                         tswapscreen();
1652                                 if(*args != 1049)
1653                                         break;
1654                                 /* FALLTRU */
1655                         case 1048:
1656                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1657                                 break;
1658                         default:
1659                                 fprintf(stderr,
1660                                         "erresc: unknown private set/reset mode %d\n",
1661                                         *args);
1662                                 break;
1663                         }
1664                 } else {
1665                         switch(*args) {
1666                         case 0:  /* Error (IGNORED) */
1667                                 break;
1668                         case 2:  /* KAM -- keyboard action */
1669                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1670                                 break;
1671                         case 4:  /* IRM -- Insertion-replacement */
1672                                 MODBIT(term.mode, set, MODE_INSERT);
1673                                 break;
1674                         case 12: /* SRM -- Send/Receive */
1675                                 MODBIT(term.mode, !set, MODE_ECHO);
1676                                 break;
1677                         case 20: /* LNM -- Linefeed/new line */
1678                                 MODBIT(term.mode, set, MODE_CRLF);
1679                                 break;
1680                         default:
1681                                 fprintf(stderr,
1682                                         "erresc: unknown set/reset mode %d\n",
1683                                         *args);
1684                                 break;
1685                         }
1686                 }
1687         }
1688 }
1689 #undef MODBIT
1690
1691
1692 void
1693 csihandle(void) {
1694         switch(csiescseq.mode) {
1695         default:
1696         unknown:
1697                 fprintf(stderr, "erresc: unknown csi ");
1698                 csidump();
1699                 /* die(""); */
1700                 break;
1701         case '@': /* ICH -- Insert <n> blank char */
1702                 DEFAULT(csiescseq.arg[0], 1);
1703                 tinsertblank(csiescseq.arg[0]);
1704                 break;
1705         case 'A': /* CUU -- Cursor <n> Up */
1706                 DEFAULT(csiescseq.arg[0], 1);
1707                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1708                 break;
1709         case 'B': /* CUD -- Cursor <n> Down */
1710         case 'e': /* VPR --Cursor <n> Down */
1711                 DEFAULT(csiescseq.arg[0], 1);
1712                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1713                 break;
1714         case 'c': /* DA -- Device Attributes */
1715                 if(csiescseq.arg[0] == 0)
1716                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1717                 break;
1718         case 'C': /* CUF -- Cursor <n> Forward */
1719         case 'a': /* HPR -- Cursor <n> Forward */
1720                 DEFAULT(csiescseq.arg[0], 1);
1721                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1722                 break;
1723         case 'D': /* CUB -- Cursor <n> Backward */
1724                 DEFAULT(csiescseq.arg[0], 1);
1725                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1726                 break;
1727         case 'E': /* CNL -- Cursor <n> Down and first col */
1728                 DEFAULT(csiescseq.arg[0], 1);
1729                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1730                 break;
1731         case 'F': /* CPL -- Cursor <n> Up and first col */
1732                 DEFAULT(csiescseq.arg[0], 1);
1733                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1734                 break;
1735         case 'g': /* TBC -- Tabulation clear */
1736                 switch(csiescseq.arg[0]) {
1737                 case 0: /* clear current tab stop */
1738                         term.tabs[term.c.x] = 0;
1739                         break;
1740                 case 3: /* clear all the tabs */
1741                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1742                         break;
1743                 default:
1744                         goto unknown;
1745                 }
1746                 break;
1747         case 'G': /* CHA -- Move to <col> */
1748         case '`': /* HPA */
1749                 DEFAULT(csiescseq.arg[0], 1);
1750                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1751                 break;
1752         case 'H': /* CUP -- Move to <row> <col> */
1753         case 'f': /* HVP */
1754                 DEFAULT(csiescseq.arg[0], 1);
1755                 DEFAULT(csiescseq.arg[1], 1);
1756                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1757                 break;
1758         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1759                 DEFAULT(csiescseq.arg[0], 1);
1760                 while(csiescseq.arg[0]--)
1761                         tputtab(1);
1762                 break;
1763         case 'J': /* ED -- Clear screen */
1764                 sel.bx = -1;
1765                 switch(csiescseq.arg[0]) {
1766                 case 0: /* below */
1767                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y, 1);
1768                         if(term.c.y < term.row-1) {
1769                                 tclearregion(0, term.c.y+1, term.col-1,
1770                                                 term.row-1, 1);
1771                         }
1772                         break;
1773                 case 1: /* above */
1774                         if(term.c.y > 1)
1775                                 tclearregion(0, 0, term.col-1, term.c.y-1, 1);
1776                         tclearregion(0, term.c.y, term.c.x, term.c.y, 1);
1777                         break;
1778                 case 2: /* all */
1779                         tclearregion(0, 0, term.col-1, term.row-1, 1);
1780                         break;
1781                 default:
1782                         goto unknown;
1783                 }
1784                 break;
1785         case 'K': /* EL -- Clear line */
1786                 switch(csiescseq.arg[0]) {
1787                 case 0: /* right */
1788                         tclearregion(term.c.x, term.c.y, term.col-1,
1789                                         term.c.y, 1);
1790                         break;
1791                 case 1: /* left */
1792                         tclearregion(0, term.c.y, term.c.x, term.c.y, 1);
1793                         break;
1794                 case 2: /* all */
1795                         tclearregion(0, term.c.y, term.col-1, term.c.y, 1);
1796                         break;
1797                 }
1798                 break;
1799         case 'S': /* SU -- Scroll <n> line up */
1800                 DEFAULT(csiescseq.arg[0], 1);
1801                 tscrollup(term.top, csiescseq.arg[0]);
1802                 break;
1803         case 'T': /* SD -- Scroll <n> line down */
1804                 DEFAULT(csiescseq.arg[0], 1);
1805                 tscrolldown(term.top, csiescseq.arg[0]);
1806                 break;
1807         case 'L': /* IL -- Insert <n> blank lines */
1808                 DEFAULT(csiescseq.arg[0], 1);
1809                 tinsertblankline(csiescseq.arg[0]);
1810                 break;
1811         case 'l': /* RM -- Reset Mode */
1812                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1813                 break;
1814         case 'M': /* DL -- Delete <n> lines */
1815                 DEFAULT(csiescseq.arg[0], 1);
1816                 tdeleteline(csiescseq.arg[0]);
1817                 break;
1818         case 'X': /* ECH -- Erase <n> char */
1819                 DEFAULT(csiescseq.arg[0], 1);
1820                 tclearregion(term.c.x, term.c.y,
1821                                 term.c.x + csiescseq.arg[0] - 1, term.c.y, 1);
1822                 break;
1823         case 'P': /* DCH -- Delete <n> char */
1824                 DEFAULT(csiescseq.arg[0], 1);
1825                 tdeletechar(csiescseq.arg[0]);
1826                 break;
1827         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1828                 DEFAULT(csiescseq.arg[0], 1);
1829                 while(csiescseq.arg[0]--)
1830                         tputtab(0);
1831                 break;
1832         case 'd': /* VPA -- Move to <row> */
1833                 DEFAULT(csiescseq.arg[0], 1);
1834                 tmoveato(term.c.x, csiescseq.arg[0]-1);
1835                 break;
1836         case 'h': /* SM -- Set terminal mode */
1837                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1838                 break;
1839         case 'm': /* SGR -- Terminal attribute (color) */
1840                 tsetattr(csiescseq.arg, csiescseq.narg);
1841                 break;
1842         case 'r': /* DECSTBM -- Set Scrolling Region */
1843                 if(csiescseq.priv) {
1844                         goto unknown;
1845                 } else {
1846                         DEFAULT(csiescseq.arg[0], 1);
1847                         DEFAULT(csiescseq.arg[1], term.row);
1848                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1849                         tmoveato(0, 0);
1850                 }
1851                 break;
1852         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1853                 tcursor(CURSOR_SAVE);
1854                 break;
1855         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1856                 tcursor(CURSOR_LOAD);
1857                 break;
1858         }
1859 }
1860
1861 void
1862 csidump(void) {
1863         int i;
1864         uint c;
1865
1866         printf("ESC[");
1867         for(i = 0; i < csiescseq.len; i++) {
1868                 c = csiescseq.buf[i] & 0xff;
1869                 if(isprint(c)) {
1870                         putchar(c);
1871                 } else if(c == '\n') {
1872                         printf("(\\n)");
1873                 } else if(c == '\r') {
1874                         printf("(\\r)");
1875                 } else if(c == 0x1b) {
1876                         printf("(\\e)");
1877                 } else {
1878                         printf("(%02x)", c);
1879                 }
1880         }
1881         putchar('\n');
1882 }
1883
1884 void
1885 csireset(void) {
1886         memset(&csiescseq, 0, sizeof(csiescseq));
1887 }
1888
1889 void
1890 strhandle(void) {
1891         char *p = NULL;
1892         int i, j, narg;
1893
1894         strparse();
1895         narg = strescseq.narg;
1896
1897         switch(strescseq.type) {
1898         case ']': /* OSC -- Operating System Command */
1899                 switch(i = atoi(strescseq.args[0])) {
1900                 case 0:
1901                 case 1:
1902                 case 2:
1903                         if(narg > 1)
1904                                 xsettitle(strescseq.args[1]);
1905                         break;
1906                 case 4: /* color set */
1907                         if(narg < 3)
1908                                 break;
1909                         p = strescseq.args[2];
1910                         /* fall through */
1911                 case 104: /* color reset, here p = NULL */
1912                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
1913                         if (!xsetcolorname(j, p)) {
1914                                 fprintf(stderr, "erresc: invalid color %s\n", p);
1915                         } else {
1916                                 /*
1917                                  * TODO if defaultbg color is changed, borders
1918                                  * are dirty
1919                                  */
1920                                 redraw(0);
1921                         }
1922                         break;
1923                 default:
1924                         fprintf(stderr, "erresc: unknown str ");
1925                         strdump();
1926                         break;
1927                 }
1928                 break;
1929         case 'k': /* old title set compatibility */
1930                 xsettitle(strescseq.args[0]);
1931                 break;
1932         case 'P': /* DSC -- Device Control String */
1933         case '_': /* APC -- Application Program Command */
1934         case '^': /* PM -- Privacy Message */
1935         default:
1936                 fprintf(stderr, "erresc: unknown str ");
1937                 strdump();
1938                 /* die(""); */
1939                 break;
1940         }
1941 }
1942
1943 void
1944 strparse(void) {
1945         char *p = strescseq.buf;
1946
1947         strescseq.narg = 0;
1948         strescseq.buf[strescseq.len] = '\0';
1949         while(p && strescseq.narg < STR_ARG_SIZ)
1950                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
1951 }
1952
1953 void
1954 strdump(void) {
1955         int i;
1956         uint c;
1957
1958         printf("ESC%c", strescseq.type);
1959         for(i = 0; i < strescseq.len; i++) {
1960                 c = strescseq.buf[i] & 0xff;
1961                 if(c == '\0') {
1962                         return;
1963                 } else if(isprint(c)) {
1964                         putchar(c);
1965                 } else if(c == '\n') {
1966                         printf("(\\n)");
1967                 } else if(c == '\r') {
1968                         printf("(\\r)");
1969                 } else if(c == 0x1b) {
1970                         printf("(\\e)");
1971                 } else {
1972                         printf("(%02x)", c);
1973                 }
1974         }
1975         printf("ESC\\\n");
1976 }
1977
1978 void
1979 strreset(void) {
1980         memset(&strescseq, 0, sizeof(strescseq));
1981 }
1982
1983 void
1984 tputtab(bool forward) {
1985         uint x = term.c.x;
1986
1987         if(forward) {
1988                 if(x == term.col)
1989                         return;
1990                 for(++x; x < term.col && !term.tabs[x]; ++x)
1991                         /* nothing */ ;
1992         } else {
1993                 if(x == 0)
1994                         return;
1995                 for(--x; x > 0 && !term.tabs[x]; --x)
1996                         /* nothing */ ;
1997         }
1998         tmoveto(x, term.c.y);
1999 }
2000
2001 void
2002 techo(char *buf, int len) {
2003         for(; len > 0; buf++, len--) {
2004                 char c = *buf;
2005
2006                 if(c == '\033') {               /* escape */
2007                         tputc("^", 1);
2008                         tputc("[", 1);
2009                 } else if(c < '\x20') { /* control code */
2010                         if(c != '\n' && c != '\r' && c != '\t') {
2011                                 c |= '\x40';
2012                                 tputc("^", 1);
2013                         }
2014                         tputc(&c, 1);
2015                 } else {
2016                         break;
2017                 }
2018         }
2019         if(len)
2020                 tputc(buf, len);
2021 }
2022
2023 void
2024 tputc(char *c, int len) {
2025         uchar ascii = *c;
2026         bool control = ascii < '\x20' || ascii == 0177;
2027
2028         if(iofd != -1) {
2029                 if(xwrite(iofd, c, len) < 0) {
2030                         fprintf(stderr, "Error writing in %s:%s\n",
2031                                 opt_io, strerror(errno));
2032                         close(iofd);
2033                         iofd = -1;
2034                 }
2035         }
2036
2037         /*
2038          * STR sequences must be checked before anything else
2039          * because it can use some control codes as part of the sequence.
2040          */
2041         if(term.esc & ESC_STR) {
2042                 switch(ascii) {
2043                 case '\033':
2044                         term.esc = ESC_START | ESC_STR_END;
2045                         break;
2046                 case '\a': /* backwards compatibility to xterm */
2047                         term.esc = 0;
2048                         strhandle();
2049                         break;
2050                 default:
2051                         if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2052                                 memmove(&strescseq.buf[strescseq.len], c, len);
2053                                 strescseq.len += len;
2054                         } else {
2055                         /*
2056                          * Here is a bug in terminals. If the user never sends
2057                          * some code to stop the str or esc command, then st
2058                          * will stop responding. But this is better than
2059                          * silently failing with unknown characters. At least
2060                          * then users will report back.
2061                          *
2062                          * In the case users ever get fixed, here is the code:
2063                          */
2064                         /*
2065                          * term.esc = 0;
2066                          * strhandle();
2067                          */
2068                         }
2069                 }
2070                 return;
2071         }
2072
2073         /*
2074          * Actions of control codes must be performed as soon they arrive
2075          * because they can be embedded inside a control sequence, and
2076          * they must not cause conflicts with sequences.
2077          */
2078         if(control) {
2079                 switch(ascii) {
2080                 case '\t':      /* HT */
2081                         tputtab(1);
2082                         return;
2083                 case '\b':      /* BS */
2084                         tmoveto(term.c.x-1, term.c.y);
2085                         return;
2086                 case '\r':      /* CR */
2087                         tmoveto(0, term.c.y);
2088                         return;
2089                 case '\f':      /* LF */
2090                 case '\v':      /* VT */
2091                 case '\n':      /* LF */
2092                         /* go to first col if the mode is set */
2093                         tnewline(IS_SET(MODE_CRLF));
2094                         return;
2095                 case '\a':      /* BEL */
2096                         if(!(xw.state & WIN_FOCUSED))
2097                                 xseturgency(1);
2098                         return;
2099                 case '\033':    /* ESC */
2100                         csireset();
2101                         term.esc = ESC_START;
2102                         return;
2103                 case '\016':    /* SO */
2104                 case '\017':    /* SI */
2105                         /*
2106                          * Different charsets are hard to handle. Applications
2107                          * should use the right alt charset escapes for the
2108                          * only reason they still exist: line drawing. The
2109                          * rest is incompatible history st should not support.
2110                          */
2111                         return;
2112                 case '\032':    /* SUB */
2113                 case '\030':    /* CAN */
2114                         csireset();
2115                         return;
2116                 case '\005':    /* ENQ (IGNORED) */
2117                 case '\000':    /* NUL (IGNORED) */
2118                 case '\021':    /* XON (IGNORED) */
2119                 case '\023':    /* XOFF (IGNORED) */
2120                 case 0177:      /* DEL (IGNORED) */
2121                         return;
2122                 }
2123         } else if(term.esc & ESC_START) {
2124                 if(term.esc & ESC_CSI) {
2125                         csiescseq.buf[csiescseq.len++] = ascii;
2126                         if(BETWEEN(ascii, 0x40, 0x7E)
2127                                         || csiescseq.len >= \
2128                                         sizeof(csiescseq.buf)-1) {
2129                                 term.esc = 0;
2130                                 csiparse();
2131                                 csihandle();
2132                         }
2133                 } else if(term.esc & ESC_STR_END) {
2134                         term.esc = 0;
2135                         if(ascii == '\\')
2136                                 strhandle();
2137                 } else if(term.esc & ESC_ALTCHARSET) {
2138                         switch(ascii) {
2139                         case '0': /* Line drawing set */
2140                                 term.c.attr.mode |= ATTR_GFX;
2141                                 break;
2142                         case 'B': /* USASCII */
2143                                 term.c.attr.mode &= ~ATTR_GFX;
2144                                 break;
2145                         case 'A': /* UK (IGNORED) */
2146                         case '<': /* multinational charset (IGNORED) */
2147                         case '5': /* Finnish (IGNORED) */
2148                         case 'C': /* Finnish (IGNORED) */
2149                         case 'K': /* German (IGNORED) */
2150                                 break;
2151                         default:
2152                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2153                         }
2154                         term.esc = 0;
2155                 } else if(term.esc & ESC_TEST) {
2156                         if(ascii == '8') { /* DEC screen alignment test. */
2157                                 char E[UTF_SIZ] = "E";
2158                                 int x, y;
2159
2160                                 for(x = 0; x < term.col; ++x) {
2161                                         for(y = 0; y < term.row; ++y)
2162                                                 tsetchar(E, &term.c.attr, x, y);
2163                                 }
2164                         }
2165                         term.esc = 0;
2166                 } else {
2167                         switch(ascii) {
2168                         case '[':
2169                                 term.esc |= ESC_CSI;
2170                                 break;
2171                         case '#':
2172                                 term.esc |= ESC_TEST;
2173                                 break;
2174                         case 'P': /* DCS -- Device Control String */
2175                         case '_': /* APC -- Application Program Command */
2176                         case '^': /* PM -- Privacy Message */
2177                         case ']': /* OSC -- Operating System Command */
2178                         case 'k': /* old title set compatibility */
2179                                 strreset();
2180                                 strescseq.type = ascii;
2181                                 term.esc |= ESC_STR;
2182                                 break;
2183                         case '(': /* set primary charset G0 */
2184                                 term.esc |= ESC_ALTCHARSET;
2185                                 break;
2186                         case ')': /* set secondary charset G1 (IGNORED) */
2187                         case '*': /* set tertiary charset G2 (IGNORED) */
2188                         case '+': /* set quaternary charset G3 (IGNORED) */
2189                                 term.esc = 0;
2190                                 break;
2191                         case 'D': /* IND -- Linefeed */
2192                                 if(term.c.y == term.bot) {
2193                                         tscrollup(term.top, 1);
2194                                 } else {
2195                                         tmoveto(term.c.x, term.c.y+1);
2196                                 }
2197                                 term.esc = 0;
2198                                 break;
2199                         case 'E': /* NEL -- Next line */
2200                                 tnewline(1); /* always go to first col */
2201                                 term.esc = 0;
2202                                 break;
2203                         case 'H': /* HTS -- Horizontal tab stop */
2204                                 term.tabs[term.c.x] = 1;
2205                                 term.esc = 0;
2206                                 break;
2207                         case 'M': /* RI -- Reverse index */
2208                                 if(term.c.y == term.top) {
2209                                         tscrolldown(term.top, 1);
2210                                 } else {
2211                                         tmoveto(term.c.x, term.c.y-1);
2212                                 }
2213                                 term.esc = 0;
2214                                 break;
2215                         case 'Z': /* DECID -- Identify Terminal */
2216                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2217                                 term.esc = 0;
2218                                 break;
2219                         case 'c': /* RIS -- Reset to inital state */
2220                                 treset();
2221                                 term.esc = 0;
2222                                 xresettitle();
2223                                 break;
2224                         case '=': /* DECPAM -- Application keypad */
2225                                 term.mode |= MODE_APPKEYPAD;
2226                                 term.esc = 0;
2227                                 break;
2228                         case '>': /* DECPNM -- Normal keypad */
2229                                 term.mode &= ~MODE_APPKEYPAD;
2230                                 term.esc = 0;
2231                                 break;
2232                         case '7': /* DECSC -- Save Cursor */
2233                                 tcursor(CURSOR_SAVE);
2234                                 term.esc = 0;
2235                                 break;
2236                         case '8': /* DECRC -- Restore Cursor */
2237                                 tcursor(CURSOR_LOAD);
2238                                 term.esc = 0;
2239                                 break;
2240                         case '\\': /* ST -- Stop */
2241                                 term.esc = 0;
2242                                 break;
2243                         default:
2244                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2245                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2246                                 term.esc = 0;
2247                         }
2248                 }
2249                 /*
2250                  * All characters which form part of a sequence are not
2251                  * printed
2252                  */
2253                 return;
2254         }
2255         /*
2256          * Display control codes only if we are in graphic mode
2257          */
2258         if(control && !(term.c.attr.mode & ATTR_GFX))
2259                 return;
2260         if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
2261                 sel.bx = -1;
2262         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
2263                 tnewline(1); /* always go to first col */
2264
2265         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col) {
2266                 memmove(&term.line[term.c.y][term.c.x+1],
2267                         &term.line[term.c.y][term.c.x],
2268                         (term.col - term.c.x - 1) * sizeof(Glyph));
2269         }
2270
2271         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2272         if(term.c.x+1 < term.col) {
2273                 tmoveto(term.c.x+1, term.c.y);
2274         } else {
2275                 term.c.state |= CURSOR_WRAPNEXT;
2276         }
2277 }
2278
2279 int
2280 tresize(int col, int row) {
2281         int i, x;
2282         int minrow = MIN(row, term.row);
2283         int mincol = MIN(col, term.col);
2284         int slide = term.c.y - row + 1;
2285         bool *bp;
2286
2287         if(col < 1 || row < 1)
2288                 return 0;
2289
2290         /* free unneeded rows */
2291         i = 0;
2292         if(slide > 0) {
2293                 /*
2294                  * slide screen to keep cursor where we expect it -
2295                  * tscrollup would work here, but we can optimize to
2296                  * memmove because we're freeing the earlier lines
2297                  */
2298                 for(/* i = 0 */; i < slide; i++) {
2299                         free(term.line[i]);
2300                         free(term.alt[i]);
2301                 }
2302                 memmove(term.line, term.line + slide, row * sizeof(Line));
2303                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2304         }
2305         for(i += row; i < term.row; i++) {
2306                 free(term.line[i]);
2307                 free(term.alt[i]);
2308         }
2309
2310         /* resize to new height */
2311         term.line = xrealloc(term.line, row * sizeof(Line));
2312         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2313         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2314         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2315
2316         /* resize each row to new width, zero-pad if needed */
2317         for(i = 0; i < minrow; i++) {
2318                 term.dirty[i] = 1;
2319                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2320                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2321                 for(x = mincol; x < col; x++) {
2322                         term.line[i][x].state = 0;
2323                         term.alt[i][x].state = 0;
2324                 }
2325         }
2326
2327         /* allocate any new rows */
2328         for(/* i == minrow */; i < row; i++) {
2329                 term.dirty[i] = 1;
2330                 term.line[i] = xcalloc(col, sizeof(Glyph));
2331                 term.alt [i] = xcalloc(col, sizeof(Glyph));
2332         }
2333         if(col > term.col) {
2334                 bp = term.tabs + term.col;
2335
2336                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2337                 while(--bp > term.tabs && !*bp)
2338                         /* nothing */ ;
2339                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2340                         *bp = 1;
2341         }
2342         /* update terminal size */
2343         term.col = col;
2344         term.row = row;
2345         /* reset scrolling region */
2346         tsetscroll(0, row-1);
2347         /* make use of the LIMIT in tmoveto */
2348         tmoveto(term.c.x, term.c.y);
2349
2350         return (slide > 0);
2351 }
2352
2353 void
2354 xresize(int col, int row) {
2355         xw.tw = MAX(1, col * xw.cw);
2356         xw.th = MAX(1, row * xw.ch);
2357
2358         XFreePixmap(xw.dpy, xw.buf);
2359         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2360                         DefaultDepth(xw.dpy, xw.scr));
2361         XftDrawChange(xw.draw, xw.buf);
2362         xclear(0, 0, xw.w, xw.h);
2363 }
2364
2365 static inline ushort
2366 sixd_to_16bit(int x) {
2367         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2368 }
2369
2370 void
2371 xloadcols(void) {
2372         int i, r, g, b;
2373         XRenderColor color = { .alpha = 0xffff };
2374
2375         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2376         for(i = 0; i < LEN(colorname); i++) {
2377                 if(!colorname[i])
2378                         continue;
2379                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2380                         die("Could not allocate color '%s'\n", colorname[i]);
2381                 }
2382         }
2383
2384         /* load colors [16-255] ; same colors as xterm */
2385         for(i = 16, r = 0; r < 6; r++) {
2386                 for(g = 0; g < 6; g++) {
2387                         for(b = 0; b < 6; b++) {
2388                                 color.red = sixd_to_16bit(r);
2389                                 color.green = sixd_to_16bit(g);
2390                                 color.blue = sixd_to_16bit(b);
2391                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2392                                         die("Could not allocate color %d\n", i);
2393                                 }
2394                                 i++;
2395                         }
2396                 }
2397         }
2398
2399         for(r = 0; r < 24; r++, i++) {
2400                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2401                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2402                                         &dc.col[i])) {
2403                         die("Could not allocate color %d\n", i);
2404                 }
2405         }
2406 }
2407
2408 int
2409 xsetcolorname(int x, const char *name) {
2410         XRenderColor color = { .alpha = 0xffff };
2411         Colour colour;
2412         if (x < 0 || x > LEN(colorname))
2413                 return -1;
2414         if(!name) {
2415                 if(16 <= x && x < 16 + 216) {
2416                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2417                         color.red = sixd_to_16bit(r);
2418                         color.green = sixd_to_16bit(g);
2419                         color.blue = sixd_to_16bit(b);
2420                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2421                                 return 0; /* something went wrong */
2422                         dc.col[x] = colour;
2423                         return 1;
2424                 } else if (16 + 216 <= x && x < 256) {
2425                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2426                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2427                                 return 0; /* something went wrong */
2428                         dc.col[x] = colour;
2429                         return 1;
2430                 } else {
2431                         name = colorname[x];
2432                 }
2433         }
2434         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2435                 return 0;
2436         dc.col[x] = colour;
2437         return 1;
2438 }
2439
2440 void
2441 xtermclear(int col1, int row1, int col2, int row2) {
2442         XftDrawRect(xw.draw,
2443                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2444                         borderpx + col1 * xw.cw,
2445                         borderpx + row1 * xw.ch,
2446                         (col2-col1+1) * xw.cw,
2447                         (row2-row1+1) * xw.ch);
2448 }
2449
2450 /*
2451  * Absolute coordinates.
2452  */
2453 void
2454 xclear(int x1, int y1, int x2, int y2) {
2455         XftDrawRect(xw.draw,
2456                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2457                         x1, y1, x2-x1, y2-y1);
2458 }
2459
2460 void
2461 xhints(void) {
2462         XClassHint class = {opt_class ? opt_class : termname, termname};
2463         XWMHints wm = {.flags = InputHint, .input = 1};
2464         XSizeHints *sizeh = NULL;
2465
2466         sizeh = XAllocSizeHints();
2467         if(xw.isfixed == False) {
2468                 sizeh->flags = PSize | PResizeInc | PBaseSize;
2469                 sizeh->height = xw.h;
2470                 sizeh->width = xw.w;
2471                 sizeh->height_inc = xw.ch;
2472                 sizeh->width_inc = xw.cw;
2473                 sizeh->base_height = 2 * borderpx;
2474                 sizeh->base_width = 2 * borderpx;
2475         } else {
2476                 sizeh->flags = PMaxSize | PMinSize;
2477                 sizeh->min_width = sizeh->max_width = xw.fw;
2478                 sizeh->min_height = sizeh->max_height = xw.fh;
2479         }
2480
2481         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
2482         XFree(sizeh);
2483 }
2484
2485 int
2486 xloadfont(Font *f, FcPattern *pattern) {
2487         FcPattern *match;
2488         FcResult result;
2489
2490         match = FcFontMatch(NULL, pattern, &result);
2491         if(!match)
2492                 return 1;
2493
2494         if(!(f->set = FcFontSort(0, match, FcTrue, 0, &result))) {
2495                 FcPatternDestroy(match);
2496                 return 1;
2497         }
2498
2499         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2500                 FcPatternDestroy(match);
2501                 return 1;
2502         }
2503
2504         f->pattern = FcPatternDuplicate(pattern);
2505
2506         f->ascent = f->match->ascent;
2507         f->descent = f->match->descent;
2508         f->lbearing = 0;
2509         f->rbearing = f->match->max_advance_width;
2510
2511         f->height = f->ascent + f->descent;
2512         f->width = f->lbearing + f->rbearing;
2513
2514         return 0;
2515 }
2516
2517 void
2518 xloadfonts(char *fontstr, int fontsize) {
2519         FcPattern *pattern;
2520         FcResult result;
2521         double fontval;
2522
2523         if(fontstr[0] == '-') {
2524                 pattern = XftXlfdParse(fontstr, False, False);
2525         } else {
2526                 pattern = FcNameParse((FcChar8 *)fontstr);
2527         }
2528
2529         if(!pattern)
2530                 die("st: can't open font %s\n", fontstr);
2531
2532         if(fontsize > 0) {
2533                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2534                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2535                 usedfontsize = fontsize;
2536         } else {
2537                 result = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2538                 if(result == FcResultMatch) {
2539                         usedfontsize = (int)fontval;
2540                 } else {
2541                         /*
2542                          * Default font size is 12, if none given. This is to
2543                          * have a known usedfontsize value.
2544                          */
2545                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2546                         usedfontsize = 12;
2547                 }
2548         }
2549
2550         FcConfigSubstitute(0, pattern, FcMatchPattern);
2551         FcDefaultSubstitute(pattern);
2552
2553         if(xloadfont(&dc.font, pattern))
2554                 die("st: can't open font %s\n", fontstr);
2555
2556         /* Setting character width and height. */
2557         xw.cw = dc.font.width;
2558         xw.ch = dc.font.height;
2559
2560         FcPatternDel(pattern, FC_SLANT);
2561         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2562         if(xloadfont(&dc.ifont, pattern))
2563                 die("st: can't open font %s\n", fontstr);
2564
2565         FcPatternDel(pattern, FC_WEIGHT);
2566         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2567         if(xloadfont(&dc.ibfont, pattern))
2568                 die("st: can't open font %s\n", fontstr);
2569
2570         FcPatternDel(pattern, FC_SLANT);
2571         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2572         if(xloadfont(&dc.bfont, pattern))
2573                 die("st: can't open font %s\n", fontstr);
2574
2575         FcPatternDestroy(pattern);
2576 }
2577
2578 void
2579 xunloadfonts(void) {
2580         int i, ip;
2581
2582         /*
2583          * Free the loaded fonts in the font cache. This is done backwards
2584          * from the frccur.
2585          */
2586         for(i = 0, ip = frccur; i < frclen; i++, ip--) {
2587                 if(ip < 0)
2588                         ip = LEN(frc) - 1;
2589                 XftFontClose(xw.dpy, frc[ip].font);
2590         }
2591         frccur = -1;
2592         frclen = 0;
2593
2594         XftFontClose(xw.dpy, dc.font.match);
2595         FcPatternDestroy(dc.font.pattern);
2596         FcFontSetDestroy(dc.font.set);
2597         XftFontClose(xw.dpy, dc.bfont.match);
2598         FcPatternDestroy(dc.bfont.pattern);
2599         FcFontSetDestroy(dc.bfont.set);
2600         XftFontClose(xw.dpy, dc.ifont.match);
2601         FcPatternDestroy(dc.ifont.pattern);
2602         FcFontSetDestroy(dc.ifont.set);
2603         XftFontClose(xw.dpy, dc.ibfont.match);
2604         FcPatternDestroy(dc.ibfont.pattern);
2605         FcFontSetDestroy(dc.ibfont.set);
2606 }
2607
2608 void
2609 xzoom(const Arg *arg) {
2610         xunloadfonts();
2611         xloadfonts(usedfont, usedfontsize + arg->i);
2612         cresize(0, 0);
2613         redraw(0);
2614 }
2615
2616 void
2617 xinit(void) {
2618         XSetWindowAttributes attrs;
2619         XGCValues gcvalues;
2620         Cursor cursor;
2621         Window parent;
2622         int sw, sh;
2623
2624         if(!(xw.dpy = XOpenDisplay(NULL)))
2625                 die("Can't open display\n");
2626         xw.scr = XDefaultScreen(xw.dpy);
2627         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2628
2629         /* font */
2630         if(!FcInit())
2631                 die("Could not init fontconfig.\n");
2632
2633         usedfont = (opt_font == NULL)? font : opt_font;
2634         xloadfonts(usedfont, 0);
2635
2636         /* colors */
2637         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
2638         xloadcols();
2639
2640         /* adjust fixed window geometry */
2641         if(xw.isfixed) {
2642                 sw = DisplayWidth(xw.dpy, xw.scr);
2643                 sh = DisplayHeight(xw.dpy, xw.scr);
2644                 if(xw.fx < 0)
2645                         xw.fx = sw + xw.fx - xw.fw - 1;
2646                 if(xw.fy < 0)
2647                         xw.fy = sh + xw.fy - xw.fh - 1;
2648
2649                 xw.h = xw.fh;
2650                 xw.w = xw.fw;
2651         } else {
2652                 /* window - default size */
2653                 xw.h = 2 * borderpx + term.row * xw.ch;
2654                 xw.w = 2 * borderpx + term.col * xw.cw;
2655                 xw.fx = 0;
2656                 xw.fy = 0;
2657         }
2658
2659         /* Events */
2660         attrs.background_pixel = dc.col[defaultbg].pixel;
2661         attrs.border_pixel = dc.col[defaultbg].pixel;
2662         attrs.bit_gravity = NorthWestGravity;
2663         attrs.event_mask = FocusChangeMask | KeyPressMask
2664                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
2665                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
2666         attrs.colormap = xw.cmap;
2667
2668         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
2669                         XRootWindow(xw.dpy, xw.scr);
2670         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
2671                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
2672                         xw.vis,
2673                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
2674                         | CWColormap,
2675                         &attrs);
2676
2677         memset(&gcvalues, 0, sizeof(gcvalues));
2678         gcvalues.graphics_exposures = False;
2679         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
2680                         &gcvalues);
2681         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2682                         DefaultDepth(xw.dpy, xw.scr));
2683         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
2684         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
2685
2686         /* Xft rendering context */
2687         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
2688
2689         /* input methods */
2690         if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
2691                 XSetLocaleModifiers("@im=local");
2692                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
2693                         XSetLocaleModifiers("@im=");
2694                         if((xw.xim = XOpenIM(xw.dpy,
2695                                         NULL, NULL, NULL)) == NULL) {
2696                                 die("XOpenIM failed. Could not open input"
2697                                         " device.\n");
2698                         }
2699                 }
2700         }
2701         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
2702                                            | XIMStatusNothing, XNClientWindow, xw.win,
2703                                            XNFocusWindow, xw.win, NULL);
2704         if(xw.xic == NULL)
2705                 die("XCreateIC failed. Could not obtain input method.\n");
2706
2707         /* white cursor, black outline */
2708         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
2709         XDefineCursor(xw.dpy, xw.win, cursor);
2710         XRecolorCursor(xw.dpy, cursor,
2711                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
2712                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
2713
2714         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
2715         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
2716         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
2717
2718         xresettitle();
2719         XMapWindow(xw.dpy, xw.win);
2720         xhints();
2721         XSync(xw.dpy, 0);
2722 }
2723
2724 void
2725 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
2726         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
2727             width = charlen * xw.cw, xp, i;
2728         int frp, frcflags;
2729         int u8fl, u8fblen, u8cblen, doesexist;
2730         char *u8c, *u8fs;
2731         long u8char;
2732         Font *font = &dc.font;
2733         FcResult fcres;
2734         FcPattern *fcpattern, *fontpattern;
2735         FcFontSet *fcsets[] = { NULL };
2736         FcCharSet *fccharset;
2737         Colour *fg, *bg, *temp, revfg, revbg;
2738         XRenderColor colfg, colbg;
2739
2740         frcflags = FRC_NORMAL;
2741
2742         if(base.mode & ATTR_ITALIC) {
2743                 if(base.fg == defaultfg)
2744                         base.fg = defaultitalic;
2745                 font = &dc.ifont;
2746                 frcflags = FRC_ITALIC;
2747         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
2748                 if(base.fg == defaultfg)
2749                         base.fg = defaultitalic;
2750                 font = &dc.ibfont;
2751                 frcflags = FRC_ITALICBOLD;
2752         } else if(base.mode & ATTR_UNDERLINE) {
2753                 if(base.fg == defaultfg)
2754                         base.fg = defaultunderline;
2755         }
2756         fg = &dc.col[base.fg];
2757         bg = &dc.col[base.bg];
2758
2759         if(base.mode & ATTR_BOLD) {
2760                 if(BETWEEN(base.fg, 0, 7)) {
2761                         /* basic system colors */
2762                         fg = &dc.col[base.fg + 8];
2763                 } else if(BETWEEN(base.fg, 16, 195)) {
2764                         /* 256 colors */
2765                         fg = &dc.col[base.fg + 36];
2766                 } else if(BETWEEN(base.fg, 232, 251)) {
2767                         /* greyscale */
2768                         fg = &dc.col[base.fg + 4];
2769                 }
2770                 /*
2771                  * Those ranges will not be brightened:
2772                  *      8 - 15 – bright system colors
2773                  *      196 - 231 – highest 256 color cube
2774                  *      252 - 255 – brightest colors in greyscale
2775                  */
2776                 font = &dc.bfont;
2777                 frcflags = FRC_BOLD;
2778         }
2779
2780         if(IS_SET(MODE_REVERSE)) {
2781                 if(fg == &dc.col[defaultfg]) {
2782                         fg = &dc.col[defaultbg];
2783                 } else {
2784                         colfg.red = ~fg->color.red;
2785                         colfg.green = ~fg->color.green;
2786                         colfg.blue = ~fg->color.blue;
2787                         colfg.alpha = fg->color.alpha;
2788                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
2789                         fg = &revfg;
2790                 }
2791
2792                 if(bg == &dc.col[defaultbg]) {
2793                         bg = &dc.col[defaultfg];
2794                 } else {
2795                         colbg.red = ~bg->color.red;
2796                         colbg.green = ~bg->color.green;
2797                         colbg.blue = ~bg->color.blue;
2798                         colbg.alpha = bg->color.alpha;
2799                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &revbg);
2800                         bg = &revbg;
2801                 }
2802         }
2803
2804         if(base.mode & ATTR_REVERSE) {
2805                 temp = fg;
2806                 fg = bg;
2807                 bg = temp;
2808         }
2809
2810         /* Intelligent cleaning up of the borders. */
2811         if(x == 0) {
2812                 xclear(0, (y == 0)? 0 : winy, borderpx,
2813                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
2814         }
2815         if(x + charlen >= term.col) {
2816                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
2817                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
2818         }
2819         if(y == 0)
2820                 xclear(winx, 0, winx + width, borderpx);
2821         if(y == term.row-1)
2822                 xclear(winx, winy + xw.ch, winx + width, xw.h);
2823
2824         /* Clean up the region we want to draw to. */
2825         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
2826
2827         fcsets[0] = font->set;
2828         for(xp = winx; bytelen > 0;) {
2829                 /*
2830                  * Search for the range in the to be printed string of glyphs
2831                  * that are in the main font. Then print that range. If
2832                  * some glyph is found that is not in the font, do the
2833                  * fallback dance.
2834                  */
2835                 u8fs = s;
2836                 u8fblen = 0;
2837                 u8fl = 0;
2838                 for(;;) {
2839                         u8c = s;
2840                         u8cblen = utf8decode(s, &u8char);
2841                         s += u8cblen;
2842                         bytelen -= u8cblen;
2843
2844                         doesexist = XftCharIndex(xw.dpy, font->match, u8char);
2845                         if(!doesexist || bytelen <= 0) {
2846                                 if(bytelen <= 0) {
2847                                         if(doesexist) {
2848                                                 u8fl++;
2849                                                 u8fblen += u8cblen;
2850                                         }
2851                                 }
2852
2853                                 if(u8fl > 0) {
2854                                         XftDrawStringUtf8(xw.draw, fg,
2855                                                         font->match, xp,
2856                                                         winy + font->ascent,
2857                                                         (FcChar8 *)u8fs,
2858                                                         u8fblen);
2859                                         xp += font->width * u8fl;
2860                                 }
2861                                 break;
2862                         }
2863
2864                         u8fl++;
2865                         u8fblen += u8cblen;
2866                 }
2867                 if(doesexist)
2868                         break;
2869
2870                 frp = frccur;
2871                 /* Search the font cache. */
2872                 for(i = 0; i < frclen; i++, frp--) {
2873                         if(frp <= 0)
2874                                 frp = LEN(frc) - 1;
2875
2876                         if(frc[frp].c == u8char
2877                                         && frc[frp].flags == frcflags) {
2878                                 break;
2879                         }
2880                 }
2881
2882                 /* Nothing was found. */
2883                 if(i >= frclen) {
2884                         /*
2885                          * Nothing was found in the cache. Now use
2886                          * some dozen of Fontconfig calls to get the
2887                          * font for one single character.
2888                          */
2889                         fcpattern = FcPatternDuplicate(font->pattern);
2890                         fccharset = FcCharSetCreate();
2891
2892                         FcCharSetAddChar(fccharset, u8char);
2893                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
2894                                         fccharset);
2895                         FcPatternAddBool(fcpattern, FC_SCALABLE,
2896                                         FcTrue);
2897
2898                         FcConfigSubstitute(0, fcpattern,
2899                                         FcMatchPattern);
2900                         FcDefaultSubstitute(fcpattern);
2901
2902                         fontpattern = FcFontSetMatch(0, fcsets,
2903                                         FcTrue, fcpattern, &fcres);
2904
2905                         /*
2906                          * Overwrite or create the new cache entry.
2907                          */
2908                         frccur++;
2909                         frclen++;
2910                         if(frccur >= LEN(frc))
2911                                 frccur = 0;
2912                         if(frclen > LEN(frc)) {
2913                                 frclen = LEN(frc);
2914                                 XftFontClose(xw.dpy, frc[frccur].font);
2915                         }
2916
2917                         frc[frccur].font = XftFontOpenPattern(xw.dpy,
2918                                         fontpattern);
2919                         frc[frccur].c = u8char;
2920                         frc[frccur].flags = frcflags;
2921
2922                         FcPatternDestroy(fcpattern);
2923                         FcCharSetDestroy(fccharset);
2924
2925                         frp = frccur;
2926                 }
2927
2928                 XftDrawStringUtf8(xw.draw, fg, frc[frp].font,
2929                                 xp, winy + frc[frp].font->ascent,
2930                                 (FcChar8 *)u8c, u8cblen);
2931
2932                 xp += font->width;
2933         }
2934
2935         /*
2936         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
2937                         winy + font->ascent, (FcChar8 *)s, bytelen);
2938         */
2939
2940         if(base.mode & ATTR_UNDERLINE) {
2941                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
2942                                 width, 1);
2943         }
2944 }
2945
2946 void
2947 xdrawcursor(void) {
2948         static int oldx = 0, oldy = 0;
2949         int sl;
2950         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs, 0};
2951
2952         LIMIT(oldx, 0, term.col-1);
2953         LIMIT(oldy, 0, term.row-1);
2954
2955         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
2956                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
2957
2958         /* remove the old cursor */
2959         if(term.line[oldy][oldx].state & GLYPH_SET) {
2960                 sl = utf8size(term.line[oldy][oldx].c);
2961                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
2962                                 oldy, 1, sl);
2963         } else {
2964                 xtermclear(oldx, oldy, oldx, oldy);
2965         }
2966
2967         /* draw the new one */
2968         if(!(IS_SET(MODE_HIDE))) {
2969                 if(xw.state & WIN_FOCUSED) {
2970                         if(IS_SET(MODE_REVERSE)) {
2971                                 g.mode |= ATTR_REVERSE;
2972                                 g.fg = defaultcs;
2973                                 g.bg = defaultfg;
2974                         }
2975
2976                         sl = utf8size(g.c);
2977                         xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
2978                 } else {
2979                         XftDrawRect(xw.draw, &dc.col[defaultcs],
2980                                         borderpx + term.c.x * xw.cw,
2981                                         borderpx + term.c.y * xw.ch,
2982                                         xw.cw - 1, 1);
2983                         XftDrawRect(xw.draw, &dc.col[defaultcs],
2984                                         borderpx + term.c.x * xw.cw,
2985                                         borderpx + term.c.y * xw.ch,
2986                                         1, xw.ch - 1);
2987                         XftDrawRect(xw.draw, &dc.col[defaultcs],
2988                                         borderpx + (term.c.x + 1) * xw.cw - 1,
2989                                         borderpx + term.c.y * xw.ch,
2990                                         1, xw.ch - 1);
2991                         XftDrawRect(xw.draw, &dc.col[defaultcs],
2992                                         borderpx + term.c.x * xw.cw,
2993                                         borderpx + (term.c.y + 1) * xw.ch - 1,
2994                                         xw.cw, 1);
2995                 }
2996                 oldx = term.c.x, oldy = term.c.y;
2997         }
2998 }
2999
3000
3001 void
3002 xsettitle(char *p) {
3003         XTextProperty prop;
3004
3005         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3006                         &prop);
3007         XSetWMName(xw.dpy, xw.win, &prop);
3008 }
3009
3010 void
3011 xresettitle(void) {
3012         xsettitle(opt_title ? opt_title : "st");
3013 }
3014
3015 void
3016 redraw(int timeout) {
3017         struct timespec tv = {0, timeout * 1000};
3018
3019         tfulldirt();
3020         draw();
3021
3022         if(timeout > 0) {
3023                 nanosleep(&tv, NULL);
3024                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3025         }
3026 }
3027
3028 void
3029 draw(void) {
3030         drawregion(0, 0, term.col, term.row);
3031         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3032                         xw.h, 0, 0);
3033         XSetForeground(xw.dpy, dc.gc,
3034                         dc.col[IS_SET(MODE_REVERSE)?
3035                                 defaultfg : defaultbg].pixel);
3036 }
3037
3038 void
3039 drawregion(int x1, int y1, int x2, int y2) {
3040         int ic, ib, x, y, ox, sl;
3041         Glyph base, new;
3042         char buf[DRAW_BUF_SIZ];
3043         bool ena_sel = sel.bx != -1;
3044
3045         if(sel.alt ^ IS_SET(MODE_ALTSCREEN))
3046                 ena_sel = 0;
3047
3048         if(!(xw.state & WIN_VISIBLE))
3049                 return;
3050
3051         for(y = y1; y < y2; y++) {
3052                 if(!term.dirty[y])
3053                         continue;
3054
3055                 xtermclear(0, y, term.col, y);
3056                 term.dirty[y] = 0;
3057                 base = term.line[y][0];
3058                 ic = ib = ox = 0;
3059                 for(x = x1; x < x2; x++) {
3060                         new = term.line[y][x];
3061                         if(ena_sel && *(new.c) && selected(x, y))
3062                                 new.mode ^= ATTR_REVERSE;
3063                         if(ib > 0 && (!(new.state & GLYPH_SET)
3064                                         || ATTRCMP(base, new)
3065                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3066                                 xdraws(buf, base, ox, y, ic, ib);
3067                                 ic = ib = 0;
3068                         }
3069                         if(new.state & GLYPH_SET) {
3070                                 if(ib == 0) {
3071                                         ox = x;
3072                                         base = new;
3073                                 }
3074
3075                                 sl = utf8size(new.c);
3076                                 memcpy(buf+ib, new.c, sl);
3077                                 ib += sl;
3078                                 ++ic;
3079                         }
3080                 }
3081                 if(ib > 0)
3082                         xdraws(buf, base, ox, y, ic, ib);
3083         }
3084         xdrawcursor();
3085 }
3086
3087 void
3088 expose(XEvent *ev) {
3089         XExposeEvent *e = &ev->xexpose;
3090
3091         if(xw.state & WIN_REDRAW) {
3092                 if(!e->count)
3093                         xw.state &= ~WIN_REDRAW;
3094         }
3095         redraw(0);
3096 }
3097
3098 void
3099 visibility(XEvent *ev) {
3100         XVisibilityEvent *e = &ev->xvisibility;
3101
3102         if(e->state == VisibilityFullyObscured) {
3103                 xw.state &= ~WIN_VISIBLE;
3104         } else if(!(xw.state & WIN_VISIBLE)) {
3105                 /* need a full redraw for next Expose, not just a buf copy */
3106                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3107         }
3108 }
3109
3110 void
3111 unmap(XEvent *ev) {
3112         xw.state &= ~WIN_VISIBLE;
3113 }
3114
3115 void
3116 xseturgency(int add) {
3117         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3118
3119         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
3120         XSetWMHints(xw.dpy, xw.win, h);
3121         XFree(h);
3122 }
3123
3124 void
3125 focus(XEvent *ev) {
3126         XFocusChangeEvent *e = &ev->xfocus;
3127
3128         if(e->mode == NotifyGrab)
3129                 return;
3130
3131         if(ev->type == FocusIn) {
3132                 XSetICFocus(xw.xic);
3133                 xw.state |= WIN_FOCUSED;
3134                 xseturgency(0);
3135         } else {
3136                 XUnsetICFocus(xw.xic);
3137                 xw.state &= ~WIN_FOCUSED;
3138         }
3139 }
3140
3141 inline bool
3142 match(uint mask, uint state) {
3143         state &= ~(ignoremod);
3144
3145         if(mask == XK_NO_MOD && state)
3146                 return false;
3147         if(mask != XK_ANY_MOD && mask != XK_NO_MOD && !state)
3148                 return false;
3149         if((state & mask) != state)
3150                 return false;
3151         return true;
3152 }
3153
3154 void
3155 numlock(const Arg *dummy) {
3156         term.numlock ^= 1;
3157 }
3158
3159 char*
3160 kmap(KeySym k, uint state) {
3161         uint mask;
3162         Key *kp;
3163         int i;
3164
3165         /* Check for mapped keys out of X11 function keys. */
3166         for(i = 0; i < LEN(mappedkeys); i++) {
3167                 if(mappedkeys[i] == k)
3168                         break;
3169         }
3170         if(i == LEN(mappedkeys)) {
3171                 if((k & 0xFFFF) < 0xFD00)
3172                         return NULL;
3173         }
3174
3175         for(kp = key; kp < key + LEN(key); kp++) {
3176                 mask = kp->mask;
3177
3178                 if(kp->k != k)
3179                         continue;
3180
3181                 if(!match(mask, state))
3182                         continue;
3183
3184                 if(kp->appkey > 0) {
3185                         if(!IS_SET(MODE_APPKEYPAD))
3186                                 continue;
3187                         if(term.numlock && kp->appkey == 2)
3188                                 continue;
3189                 } else if(kp->appkey < 0 && IS_SET(MODE_APPKEYPAD)) {
3190                         continue;
3191                 }
3192
3193                 if((kp->appcursor < 0 && IS_SET(MODE_APPCURSOR)) ||
3194                                 (kp->appcursor > 0
3195                                  && !IS_SET(MODE_APPCURSOR))) {
3196                         continue;
3197                 }
3198
3199                 if((kp->crlf < 0 && IS_SET(MODE_CRLF)) ||
3200                                 (kp->crlf > 0 && !IS_SET(MODE_CRLF))) {
3201                         continue;
3202                 }
3203
3204                 return kp->s;
3205         }
3206
3207         return NULL;
3208 }
3209
3210 void
3211 kpress(XEvent *ev) {
3212         XKeyEvent *e = &ev->xkey;
3213         KeySym ksym;
3214         char xstr[31], buf[32], *customkey, *cp = buf;
3215         int len;
3216         Status status;
3217         Shortcut *bp;
3218
3219         if(IS_SET(MODE_KBDLOCK))
3220                 return;
3221
3222         len = XmbLookupString(xw.xic, e, xstr, sizeof(xstr), &ksym, &status);
3223         e->state &= ~Mod2Mask;
3224         /* 1. shortcuts */
3225         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3226                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3227                         bp->func(&(bp->arg));
3228                         return;
3229                 }
3230         }
3231
3232         /* 2. custom keys from config.h */
3233         if((customkey = kmap(ksym, e->state))) {
3234                 len = strlen(customkey);
3235                 memcpy(buf, customkey, len);
3236         /* 2. hardcoded (overrides X lookup) */
3237         } else {
3238                 if(len == 0)
3239                         return;
3240
3241                 if(len == 1 && e->state & Mod1Mask)
3242                         *cp++ = '\033';
3243
3244                 memcpy(cp, xstr, len);
3245                 len = cp - buf + len;
3246         }
3247
3248         ttywrite(buf, len);
3249         if(IS_SET(MODE_ECHO))
3250                 techo(buf, len);
3251 }
3252
3253
3254 void
3255 cmessage(XEvent *e) {
3256         /*
3257          * See xembed specs
3258          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3259          */
3260         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3261                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3262                         xw.state |= WIN_FOCUSED;
3263                         xseturgency(0);
3264                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3265                         xw.state &= ~WIN_FOCUSED;
3266                 }
3267         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3268                 /* Send SIGHUP to shell */
3269                 kill(pid, SIGHUP);
3270                 exit(EXIT_SUCCESS);
3271         }
3272 }
3273
3274 void
3275 cresize(int width, int height) {
3276         int col, row;
3277
3278         if(width != 0)
3279                 xw.w = width;
3280         if(height != 0)
3281                 xw.h = height;
3282
3283         col = (xw.w - 2 * borderpx) / xw.cw;
3284         row = (xw.h - 2 * borderpx) / xw.ch;
3285
3286         tresize(col, row);
3287         xresize(col, row);
3288         ttyresize();
3289 }
3290
3291 void
3292 resize(XEvent *e) {
3293         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3294                 return;
3295
3296         cresize(e->xconfigure.width, e->xconfigure.height);
3297 }
3298
3299 void
3300 run(void) {
3301         XEvent ev;
3302         fd_set rfd;
3303         int xfd = XConnectionNumber(xw.dpy), xev;
3304         struct timeval drawtimeout, *tv = NULL, now, last;
3305
3306         gettimeofday(&last, NULL);
3307
3308         for(xev = actionfps;;) {
3309                 FD_ZERO(&rfd);
3310                 FD_SET(cmdfd, &rfd);
3311                 FD_SET(xfd, &rfd);
3312                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3313                         if(errno == EINTR)
3314                                 continue;
3315                         die("select failed: %s\n", SERRNO);
3316                 }
3317
3318                 gettimeofday(&now, NULL);
3319                 drawtimeout.tv_sec = 0;
3320                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3321                 tv = &drawtimeout;
3322
3323                 if(FD_ISSET(cmdfd, &rfd))
3324                         ttyread();
3325
3326                 if(FD_ISSET(xfd, &rfd))
3327                         xev = actionfps;
3328
3329                 if(TIMEDIFF(now, last) > \
3330                                 (xev ? (1000/xfps) : (1000/actionfps))) {
3331                         while(XPending(xw.dpy)) {
3332                                 XNextEvent(xw.dpy, &ev);
3333                                 if(XFilterEvent(&ev, None))
3334                                         continue;
3335                                 if(handler[ev.type])
3336                                         (handler[ev.type])(&ev);
3337                         }
3338
3339                         draw();
3340                         XFlush(xw.dpy);
3341                         last = now;
3342
3343                         if(xev && !FD_ISSET(xfd, &rfd))
3344                                 xev--;
3345                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd))
3346                                 tv = NULL;
3347                 }
3348         }
3349 }
3350
3351 void
3352 usage(void) {
3353         die("%s " VERSION " (c) 2010-2013 st engineers\n" \
3354         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3355         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3356 }
3357
3358 int
3359 main(int argc, char *argv[]) {
3360         int bitm, xr, yr;
3361         uint wr, hr;
3362
3363         xw.fw = xw.fh = xw.fx = xw.fy = 0;
3364         xw.isfixed = False;
3365
3366         ARGBEGIN {
3367         case 'a':
3368                 allowaltscreen = false;
3369                 break;
3370         case 'c':
3371                 opt_class = EARGF(usage());
3372                 break;
3373         case 'e':
3374                 /* eat all remaining arguments */
3375                 if(argc > 1)
3376                         opt_cmd = &argv[1];
3377                 goto run;
3378         case 'f':
3379                 opt_font = EARGF(usage());
3380                 break;
3381         case 'g':
3382                 bitm = XParseGeometry(EARGF(usage()), &xr, &yr, &wr, &hr);
3383                 if(bitm & XValue)
3384                         xw.fx = xr;
3385                 if(bitm & YValue)
3386                         xw.fy = yr;
3387                 if(bitm & WidthValue)
3388                         xw.fw = (int)wr;
3389                 if(bitm & HeightValue)
3390                         xw.fh = (int)hr;
3391                 if(bitm & XNegative && xw.fx == 0)
3392                         xw.fx = -1;
3393                 if(bitm & XNegative && xw.fy == 0)
3394                         xw.fy = -1;
3395
3396                 if(xw.fh != 0 && xw.fw != 0)
3397                         xw.isfixed = True;
3398                 break;
3399         case 'o':
3400                 opt_io = EARGF(usage());
3401                 break;
3402         case 't':
3403                 opt_title = EARGF(usage());
3404                 break;
3405         case 'w':
3406                 opt_embed = EARGF(usage());
3407                 break;
3408         case 'v':
3409         default:
3410                 usage();
3411         } ARGEND;
3412
3413 run:
3414         setlocale(LC_CTYPE, "");
3415         XSetLocaleModifiers("");
3416         tnew(80, 24);
3417         xinit();
3418         ttynew();
3419         selinit();
3420         if(xw.isfixed)
3421                 cresize(xw.h, xw.w);
3422         run();
3423
3424         return 0;
3425 }
3426