st.c

   1 /* See LICENSE for licence details. */
   2 #define _XOPEN_SOURCE 600
   3 #include <ctype.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <limits.h>
   7 #include <locale.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/extensions/Xdbe.h>
  28
  29 #if   defined(__linux)
  30  #include <pty.h>
  31 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  32  #include <util.h>
  33 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  34  #include <libutil.h>
  35 #endif
  36
  37 #define USAGE \
  38         "st " VERSION " (c) 2010-2012 st engineers\n" \
  39         "usage: st [-t title] [-c class] [-g geometry]" \
  40         " [-w windowid] [-v] [-f file] [-e command...]\n"
  41
  42 /* XEMBED messages */
  43 #define XEMBED_FOCUS_IN  4
  44 #define XEMBED_FOCUS_OUT 5
  45
  46 /* Arbitrary sizes */
  47 #define ESC_BUF_SIZ   256
  48 #define ESC_ARG_SIZ   16
  49 #define STR_BUF_SIZ   256
  50 #define STR_ARG_SIZ   16
  51 #define DRAW_BUF_SIZ  1024
  52 #define UTF_SIZ       4
  53 #define XK_NO_MOD     UINT_MAX
  54 #define XK_ANY_MOD    0
  55
  56 #define SELECT_TIMEOUT (20*1000) /* 20 ms */
  57 #define DRAW_TIMEOUT  (20*1000) /* 20 ms */
  58 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  59
  60 #define SERRNO strerror(errno)
  61 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  62 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  63 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  64 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  65 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  66 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  67 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  68 #define IS_SET(flag) (term.mode & (flag))
  69 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  70 #define X2COL(x) (((x) - BORDER)/xw.cw)
  71 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
  72
  73 enum glyph_attribute {
  74         ATTR_NULL      = 0,
  75         ATTR_REVERSE   = 1,
  76         ATTR_UNDERLINE = 2,
  77         ATTR_BOLD      = 4,
  78         ATTR_GFX       = 8,
  79         ATTR_ITALIC    = 16,
  80         ATTR_BLINK     = 32,
  81 };
  82
  83 enum cursor_movement {
  84         CURSOR_UP,
  85         CURSOR_DOWN,
  86         CURSOR_LEFT,
  87         CURSOR_RIGHT,
  88         CURSOR_SAVE,
  89         CURSOR_LOAD
  90 };
  91
  92 enum cursor_state {
  93         CURSOR_DEFAULT  = 0,
  94         CURSOR_HIDE     = 1,
  95         CURSOR_WRAPNEXT = 2
  96 };
  97
  98 enum glyph_state {
  99         GLYPH_SET   = 1,
 100         GLYPH_DIRTY = 2
 101 };
 102
 103 enum term_mode {
 104         MODE_WRAP       = 1,
 105         MODE_INSERT      = 2,
 106         MODE_APPKEYPAD   = 4,
 107         MODE_ALTSCREEN   = 8,
 108         MODE_CRLF       = 16,
 109         MODE_MOUSEBTN    = 32,
 110         MODE_MOUSEMOTION = 64,
 111         MODE_MOUSE       = 32|64,
 112         MODE_REVERSE     = 128
 113 };
 114
 115 enum escape_state {
 116         ESC_START      = 1,
 117         ESC_CSI = 2,
 118         ESC_STR = 4, /* DSC, OSC, PM, APC */
 119         ESC_ALTCHARSET = 8,
 120         ESC_STR_END    = 16, /* a final string was encountered */
 121 };
 122
 123 enum window_state {
 124         WIN_VISIBLE = 1,
 125         WIN_REDRAW  = 2,
 126         WIN_FOCUSED = 4
 127 };
 128
 129 /* bit macro */
 130 #undef B0
 131 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 132
 133 typedef unsigned char uchar;
 134 typedef unsigned int uint;
 135 typedef unsigned long ulong;
 136 typedef unsigned short ushort;
 137
 138 typedef struct {
 139         char c[UTF_SIZ];     /* character code */
 140         uchar mode;  /* attribute flags */
 141         ushort fg;   /* foreground  */
 142         ushort bg;   /* background  */
 143         uchar state; /* state flags    */
 144 } Glyph;
 145
 146 typedef Glyph* Line;
 147
 148 typedef struct {
 149         Glyph attr;      /* current char attributes */
 150         int x;
 151         int y;
 152         char state;
 153 } TCursor;
 154
 155 /* CSI Escape sequence structs */
 156 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 157 typedef struct {
 158         char buf[ESC_BUF_SIZ]; /* raw string */
 159         int len;               /* raw string length */
 160         char priv;
 161         int arg[ESC_ARG_SIZ];
 162         int narg;             /* nb of args */
 163         char mode;
 164 } CSIEscape;
 165
 166 /* STR Escape sequence structs */
 167 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 168 typedef struct {
 169         char type;           /* ESC type ... */
 170         char buf[STR_BUF_SIZ]; /* raw string */
 171         int len;               /* raw string length */
 172         char *args[STR_ARG_SIZ];
 173         int narg;             /* nb of args */
 174 } STREscape;
 175
 176 /* Internal representation of the screen */
 177 typedef struct {
 178         int row;        /* nb row */
 179         int col;        /* nb col */
 180         Line* line;     /* screen */
 181         Line* alt;      /* alternate screen */
 182         bool* dirty;    /* dirtyness of lines */
 183         TCursor c;      /* cursor */
 184         int top;        /* top    scroll limit */
 185         int bot;        /* bottom scroll limit */
 186         int mode;       /* terminal mode flags */
 187         int esc;        /* escape state flags */
 188         bool *tabs;
 189 } Term;
 190
 191 /* Purely graphic info */
 192 typedef struct {
 193         Display* dpy;
 194         Colormap cmap;
 195         Window win;
 196         XdbeBackBuffer buf;
 197         Atom xembed;
 198         XIM xim;
 199         XIC xic;
 200         int scr;
 201         Bool isfixed; /* is fixed geometry? */
 202         int fx, fy, fw, fh; /* fixed geometry */
 203         int w;  /* window width */
 204         int h;  /* window height */
 205         int ch; /* char height */
 206         int cw; /* char width  */
 207         char state; /* focus, redraw, visible */
 208         struct timeval lastdraw;
 209 } XWindow;
 210
 211 typedef struct {
 212         KeySym k;
 213         uint mask;
 214         char s[ESC_BUF_SIZ];
 215 } Key;
 216
 217
 218 /* TODO: use better name for vars... */
 219 typedef struct {
 220         int mode;
 221         int bx, by;
 222         int ex, ey;
 223         struct {int x, y;} b, e;
 224         char *clip;
 225         Atom xtarget;
 226         bool alt;
 227         struct timeval tclick1;
 228         struct timeval tclick2;
 229 } Selection;
 230
 231 #include "config.h"
 232
 233 /* Drawing Context */
 234 typedef struct {
 235         ulong col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 236         GC gc;
 237         struct {
 238                 int ascent;
 239                 int descent;
 240                 short lbearing;
 241                 short rbearing;
 242                 XFontSet set;
 243         } font, bfont, ifont;
 244 } DC;
 245
 246 static void die(const char*, ...);
 247 static void draw(void);
 248 static void redraw(void);
 249 static void drawregion(int, int, int, int);
 250 static void execsh(void);
 251 static void sigchld(int);
 252 static void run(void);
 253 static bool last_draw_too_old(void);
 254
 255 static void csidump(void);
 256 static void csihandle(void);
 257 static void csiparse(void);
 258 static void csireset(void);
 259 static void strdump(void);
 260 static void strhandle(void);
 261 static void strparse(void);
 262 static void strreset(void);
 263
 264 static void tclearregion(int, int, int, int);
 265 static void tcursor(int);
 266 static void tdeletechar(int);
 267 static void tdeleteline(int);
 268 static void tinsertblank(int);
 269 static void tinsertblankline(int);
 270 static void tmoveto(int, int);
 271 static void tnew(int, int);
 272 static void tnewline(int);
 273 static void tputtab(bool);
 274 static void tputc(char*);
 275 static void treset(void);
 276 static int tresize(int, int);
 277 static void tscrollup(int, int);
 278 static void tscrolldown(int, int);
 279 static void tsetattr(int*, int);
 280 static void tsetchar(char*);
 281 static void tsetscroll(int, int);
 282 static void tswapscreen(void);
 283 static void tsetdirt(int, int);
 284 static void tsetmode(bool, bool, int *, int);
 285 static void tfulldirt(void);
 286
 287 static void ttynew(void);
 288 static void ttyread(void);
 289 static void ttyresize(int, int);
 290 static void ttywrite(const char *, size_t);
 291
 292 static void xdraws(char *, Glyph, int, int, int, int);
 293 static void xhints(void);
 294 static void xclear(int, int, int, int);
 295 static void xcopy(void);
 296 static void xdrawcursor(void);
 297 static void xinit(void);
 298 static void xloadcols(void);
 299 static void xresettitle(void);
 300 static void xseturgency(int);
 301 static void xsetsel(char*);
 302 static void xresize(int, int);
 303
 304 static void expose(XEvent *);
 305 static void visibility(XEvent *);
 306 static void unmap(XEvent *);
 307 static char* kmap(KeySym, uint);
 308 static void kpress(XEvent *);
 309 static void cmessage(XEvent *);
 310 static void resize(XEvent *);
 311 static void focus(XEvent *);
 312 static void brelease(XEvent *);
 313 static void bpress(XEvent *);
 314 static void bmotion(XEvent *);
 315 static void selnotify(XEvent *);
 316 static void selclear(XEvent *);
 317 static void selrequest(XEvent *);
 318
 319 static void selinit(void);
 320 static inline bool selected(int, int);
 321 static void selcopy(void);
 322 static void selpaste(void);
 323 static void selscroll(int, int);
 324
 325 static int utf8decode(char *, long *);
 326 static int utf8encode(long *, char *);
 327 static int utf8size(char *);
 328 static int isfullutf8(char *, int);
 329
 330 static void *xmalloc(size_t);
 331 static void *xrealloc(void *, size_t);
 332
 333 static void (*handler[LASTEvent])(XEvent *) = {
 334         [KeyPress] = kpress,
 335         [ClientMessage] = cmessage,
 336         [ConfigureNotify] = resize,
 337         [VisibilityNotify] = visibility,
 338         [UnmapNotify] = unmap,
 339         [Expose] = expose,
 340         [FocusIn] = focus,
 341         [FocusOut] = focus,
 342         [MotionNotify] = bmotion,
 343         [ButtonPress] = bpress,
 344         [ButtonRelease] = brelease,
 345         [SelectionClear] = selclear,
 346         [SelectionNotify] = selnotify,
 347         [SelectionRequest] = selrequest,
 348 };
 349
 350 /* Globals */
 351 static DC dc;
 352 static XWindow xw;
 353 static Term term;
 354 static CSIEscape csiescseq;
 355 static STREscape strescseq;
 356 static int cmdfd;
 357 static pid_t pid;
 358 static Selection sel;
 359 static int iofd = -1;
 360 static char **opt_cmd  = NULL;
 361 static char *opt_io    = NULL;
 362 static char *opt_title = NULL;
 363 static char *opt_embed = NULL;
 364 static char *opt_class = NULL;
 365
 366 void *
 367 xmalloc(size_t len) {
 368         void *p = malloc(len);
 369         if(!p)
 370                 die("Out of memory");
 371         return p;
 372 }
 373
 374 void *
 375 xrealloc(void *p, size_t len) {
 376         if((p = realloc(p, len)) == NULL)
 377                 die("Out of memory");
 378         return p;
 379 }
 380
 381 int
 382 utf8decode(char *s, long *u) {
 383         uchar c;
 384         int i, n, rtn;
 385
 386         rtn = 1;
 387         c = *s;
 388         if(~c & B7) { /* 0xxxxxxx */
 389                 *u = c;
 390                 return rtn;
 391         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 392                 *u = c&(B4|B3|B2|B1|B0);
 393                 n = 1;
 394         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 395                 *u = c&(B3|B2|B1|B0);
 396                 n = 2;
 397         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 398                 *u = c & (B2|B1|B0);
 399                 n = 3;
 400         } else
 401                 goto invalid;
 402         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 403                 c = *s;
 404                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 405                         goto invalid;
 406                 *u <<= 6;
 407                 *u |= c & (B5|B4|B3|B2|B1|B0);
 408         }
 409         if((n == 1 && *u < 0x80) ||
 410            (n == 2 && *u < 0x800) ||
 411            (n == 3 && *u < 0x10000) ||
 412            (*u >= 0xD800 && *u <= 0xDFFF))
 413                 goto invalid;
 414         return rtn;
 415 invalid:
 416         *u = 0xFFFD;
 417         return rtn;
 418 }
 419
 420 int
 421 utf8encode(long *u, char *s) {
 422         uchar *sp;
 423         ulong uc;
 424         int i, n;
 425
 426         sp = (uchar*) s;
 427         uc = *u;
 428         if(uc < 0x80) {
 429                 *sp = uc; /* 0xxxxxxx */
 430                 return 1;
 431         } else if(*u < 0x800) {
 432                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 433                 n = 1;
 434         } else if(uc < 0x10000) {
 435                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 436                 n = 2;
 437         } else if(uc <= 0x10FFFF) {
 438                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 439                 n = 3;
 440         } else {
 441                 goto invalid;
 442         }
 443         for(i=n,++sp; i>0; --i,++sp)
 444                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 445         return n+1;
 446 invalid:
 447         /* U+FFFD */
 448         *s++ = '\xEF';
 449         *s++ = '\xBF';
 450         *s = '\xBD';
 451         return 3;
 452 }
 453
 454 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 455    UTF-8 otherwise return 0 */
 456 int
 457 isfullutf8(char *s, int b) {
 458         uchar *c1, *c2, *c3;
 459
 460         c1 = (uchar *) s;
 461         c2 = (uchar *) ++s;
 462         c3 = (uchar *) ++s;
 463         if(b < 1)
 464                 return 0;
 465         else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
 466                 return 0;
 467         else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 468             ((b == 1) ||
 469             ((b == 2) && (*c2&(B7|B6)) == B7)))
 470                 return 0;
 471         else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 472             ((b == 1) ||
 473             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 474             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
 475                 return 0;
 476         else
 477                 return 1;
 478 }
 479
 480 int
 481 utf8size(char *s) {
 482         uchar c = *s;
 483
 484         if(~c&B7)
 485                 return 1;
 486         else if((c&(B7|B6|B5)) == (B7|B6))
 487                 return 2;
 488         else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
 489                 return 3;
 490         else
 491                 return 4;
 492 }
 493
 494 void
 495 selinit(void) {
 496         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 497         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 498         sel.mode = 0;
 499         sel.bx = -1;
 500         sel.clip = NULL;
 501         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 502         if(sel.xtarget == None)
 503                 sel.xtarget = XA_STRING;
 504 }
 505
 506 static inline bool
 507 selected(int x, int y) {
 508         if(sel.ey == y && sel.by == y) {
 509                 int bx = MIN(sel.bx, sel.ex);
 510                 int ex = MAX(sel.bx, sel.ex);
 511                 return BETWEEN(x, bx, ex);
 512         }
 513         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 514                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 515 }
 516
 517 void
 518 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 519         if(b)
 520                 *b = e->xbutton.button;
 521
 522         *x = X2COL(e->xbutton.x);
 523         *y = Y2ROW(e->xbutton.y);
 524         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 525         sel.b.y = MIN(sel.by, sel.ey);
 526         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 527         sel.e.y = MAX(sel.by, sel.ey);
 528 }
 529
 530 void
 531 mousereport(XEvent *e) {
 532         int x = X2COL(e->xbutton.x);
 533         int y = Y2ROW(e->xbutton.y);
 534         int button = e->xbutton.button;
 535         int state = e->xbutton.state;
 536         char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
 537         static int ob, ox, oy;
 538
 539         /* from urxvt */
 540         if(e->xbutton.type == MotionNotify) {
 541                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 542                         return;
 543                 button = ob + 32;
 544                 ox = x, oy = y;
 545         } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
 546                 button = 3;
 547         } else {
 548                 button -= Button1;
 549                 if(button >= 3)
 550                         button += 64 - 3;
 551                 if(e->xbutton.type == ButtonPress) {
 552                         ob = button;
 553                         ox = x, oy = y;
 554                 }
 555         }
 556
 557         buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
 558                 + (state & Mod4Mask    ? 8  : 0)
 559                 + (state & ControlMask ? 16 : 0);
 560
 561         ttywrite(buf, sizeof(buf));
 562 }
 563
 564 void
 565 bpress(XEvent *e) {
 566         if(IS_SET(MODE_MOUSE))
 567                 mousereport(e);
 568         else if(e->xbutton.button == Button1) {
 569                 if(sel.bx != -1)
 570                         tsetdirt(sel.b.y, sel.e.y);
 571                 sel.mode = 1;
 572                 sel.ex = sel.bx = X2COL(e->xbutton.x);
 573                 sel.ey = sel.by = Y2ROW(e->xbutton.y);
 574         }
 575 }
 576
 577 void
 578 selcopy(void) {
 579         char *str, *ptr;
 580         int x, y, bufsize, is_selected = 0;
 581
 582         if(sel.bx == -1)
 583                 str = NULL;
 584
 585         else {
 586                 bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 587                 ptr = str = xmalloc(bufsize);
 588
 589                 /* append every set & selected glyph to the selection */
 590                 for(y = 0; y < term.row; y++) {
 591                         for(x = 0; x < term.col; x++) {
 592                                 is_selected = selected(x, y);
 593                                 if((term.line[y][x].state & GLYPH_SET) && is_selected) {
 594                                         int size = utf8size(term.line[y][x].c);
 595                                         memcpy(ptr, term.line[y][x].c, size);
 596                                         ptr += size;
 597                                 }
 598                         }
 599
 600                         /* \n at the end of every selected line except for the last one */
 601                         if(is_selected && y < sel.e.y)
 602                                 *ptr++ = '\n';
 603                 }
 604                 *ptr = 0;
 605         }
 606         sel.alt = IS_SET(MODE_ALTSCREEN);
 607         xsetsel(str);
 608 }
 609
 610 void
 611 selnotify(XEvent *e) {
 612         ulong nitems, ofs, rem;
 613         int format;
 614         uchar *data;
 615         Atom type;
 616
 617         ofs = 0;
 618         do {
 619                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 620                                         False, AnyPropertyType, &type, &format,
 621                                         &nitems, &rem, &data)) {
 622                         fprintf(stderr, "Clipboard allocation failed\n");
 623                         return;
 624                 }
 625                 ttywrite((const char *) data, nitems * format / 8);
 626                 XFree(data);
 627                 /* number of 32-bit chunks returned */
 628                 ofs += nitems * format / 32;
 629         } while(rem > 0);
 630 }
 631
 632 void
 633 selpaste() {
 634         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
 635 }
 636
 637 void selclear(XEvent *e) {
 638         if(sel.bx == -1)
 639                 return;
 640         sel.bx = -1;
 641         tsetdirt(sel.b.y, sel.e.y);
 642         draw();
 643 }
 644
 645 void
 646 selrequest(XEvent *e) {
 647         XSelectionRequestEvent *xsre;
 648         XSelectionEvent xev;
 649         Atom xa_targets;
 650
 651         xsre = (XSelectionRequestEvent *) e;
 652         xev.type = SelectionNotify;
 653         xev.requestor = xsre->requestor;
 654         xev.selection = xsre->selection;
 655         xev.target = xsre->target;
 656         xev.time = xsre->time;
 657         /* reject */
 658         xev.property = None;
 659
 660         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 661         if(xsre->target == xa_targets) {
 662                 /* respond with the supported type */
 663                 Atom string = sel.xtarget;
 664                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 665                                 XA_ATOM, 32, PropModeReplace,
 666                                 (uchar *) &string, 1);
 667                 xev.property = xsre->property;
 668         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 669                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 670                                 xsre->target, 8, PropModeReplace,
 671                                 (uchar *) sel.clip, strlen(sel.clip));
 672                 xev.property = xsre->property;
 673         }
 674
 675         /* all done, send a notification to the listener */
 676         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 677                 fprintf(stderr, "Error sending SelectionNotify event\n");
 678 }
 679
 680 void
 681 xsetsel(char *str) {
 682         /* register the selection for both the clipboard and the primary */
 683         Atom clipboard;
 684
 685         free(sel.clip);
 686         sel.clip = str;
 687
 688         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 689
 690         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 691         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 692
 693         XFlush(xw.dpy);
 694 }
 695
 696 void
 697 brelease(XEvent *e) {
 698         if(IS_SET(MODE_MOUSE)) {
 699                 mousereport(e);
 700                 return;
 701         }
 702         if(e->xbutton.button == Button2)
 703                 selpaste();
 704         else if(e->xbutton.button == Button1) {
 705                 sel.mode = 0;
 706                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 707                 term.dirty[sel.ey] = 1;
 708                 if(sel.bx == sel.ex && sel.by == sel.ey) {
 709                         struct timeval now;
 710                         sel.bx = -1;
 711                         gettimeofday(&now, NULL);
 712
 713                         if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
 714                                 /* triple click on the line */
 715                                 sel.b.x = sel.bx = 0;
 716                                 sel.e.x = sel.ex = term.col;
 717                                 sel.b.y = sel.e.y = sel.ey;
 718                                 selcopy();
 719                         } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
 720                                 /* double click to select word */
 721                                 sel.bx = sel.ex;
 722                                 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
 723                                           term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
 724                                 sel.b.x = sel.bx;
 725                                 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
 726                                           term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
 727                                 sel.e.x = sel.ex;
 728                                 sel.b.y = sel.e.y = sel.ey;
 729                                 selcopy();
 730                         }
 731                 } else
 732                         selcopy();
 733         }
 734         memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
 735         gettimeofday(&sel.tclick1, NULL);
 736         draw();
 737 }
 738
 739 void
 740 bmotion(XEvent *e) {
 741         if(IS_SET(MODE_MOUSE)) {
 742                 mousereport(e);
 743                 return;
 744         }
 745         if(sel.mode) {
 746                 int oldey = sel.ey, oldex = sel.ex;
 747                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 748
 749                 if(oldey != sel.ey || oldex != sel.ex) {
 750                         int starty = MIN(oldey, sel.ey);
 751                         int endy = MAX(oldey, sel.ey);
 752                         tsetdirt(starty, endy);
 753                         draw();
 754                 }
 755         }
 756 }
 757
 758 void
 759 die(const char *errstr, ...) {
 760         va_list ap;
 761
 762         va_start(ap, errstr);
 763         vfprintf(stderr, errstr, ap);
 764         va_end(ap);
 765         exit(EXIT_FAILURE);
 766 }
 767
 768 void
 769 execsh(void) {
 770         char **args;
 771         char *envshell = getenv("SHELL");
 772
 773         unsetenv("COLUMNS");
 774         unsetenv("LINES");
 775         unsetenv("TERMCAP");
 776
 777         DEFAULT(envshell, SHELL);
 778         putenv("TERM="TNAME);
 779         args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
 780         execvp(args[0], args);
 781         exit(EXIT_FAILURE);
 782 }
 783
 784 void
 785 sigchld(int a) {
 786         int stat = 0;
 787         if(waitpid(pid, &stat, 0) < 0)
 788                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 789         if(WIFEXITED(stat))
 790                 exit(WEXITSTATUS(stat));
 791         else
 792                 exit(EXIT_FAILURE);
 793 }
 794
 795 void
 796 ttynew(void) {
 797         int m, s;
 798
 799         /* seems to work fine on linux, openbsd and freebsd */
 800         struct winsize w = {term.row, term.col, 0, 0};
 801         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 802                 die("openpty failed: %s\n", SERRNO);
 803
 804         switch(pid = fork()) {
 805         case -1:
 806                 die("fork failed\n");
 807                 break;
 808         case 0:
 809                 setsid(); /* create a new process group */
 810                 dup2(s, STDIN_FILENO);
 811                 dup2(s, STDOUT_FILENO);
 812                 dup2(s, STDERR_FILENO);
 813                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 814                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 815                 close(s);
 816                 close(m);
 817                 execsh();
 818                 break;
 819         default:
 820                 close(s);
 821                 cmdfd = m;
 822                 signal(SIGCHLD, sigchld);
 823                 if(opt_io) {
 824                         if(!strcmp(opt_io, "-")) {
 825                                 iofd = STDOUT_FILENO;
 826                         } else {
 827                                 if((iofd = open(opt_io, O_WRONLY | O_CREAT, 0666)) < 0) {
 828                                         fprintf(stderr, "Error opening %s:%s\n",
 829                                                 opt_io, strerror(errno));
 830                                 }
 831                         }
 832                 }
 833         }
 834 }
 835
 836 void
 837 dump(char c) {
 838         static int col;
 839         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 840         if(++col % 10 == 0)
 841                 fprintf(stderr, "\n");
 842 }
 843
 844 void
 845 ttyread(void) {
 846         static char buf[BUFSIZ];
 847         static int buflen = 0;
 848         char *ptr;
 849         char s[UTF_SIZ];
 850         int charsize; /* size of utf8 char in bytes */
 851         long utf8c;
 852         int ret;
 853
 854         /* append read bytes to unprocessed bytes */
 855         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
 856                 die("Couldn't read from shell: %s\n", SERRNO);
 857
 858         /* process every complete utf8 char */
 859         buflen += ret;
 860         ptr = buf;
 861         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
 862                 charsize = utf8decode(ptr, &utf8c);
 863                 utf8encode(&utf8c, s);
 864                 tputc(s);
 865                 ptr    += charsize;
 866                 buflen -= charsize;
 867         }
 868
 869         /* keep any uncomplete utf8 char for the next call */
 870         memmove(buf, ptr, buflen);
 871 }
 872
 873 void
 874 ttywrite(const char *s, size_t n) {
 875         if(write(cmdfd, s, n) == -1)
 876                 die("write error on tty: %s\n", SERRNO);
 877 }
 878
 879 void
 880 ttyresize(int x, int y) {
 881         struct winsize w;
 882
 883         w.ws_row = term.row;
 884         w.ws_col = term.col;
 885         w.ws_xpixel = xw.w;
 886         w.ws_ypixel = xw.h;
 887         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 888                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 889 }
 890
 891 void
 892 tsetdirt(int top, int bot)
 893 {
 894         int i;
 895
 896         LIMIT(top, 0, term.row-1);
 897         LIMIT(bot, 0, term.row-1);
 898
 899         for(i = top; i <= bot; i++)
 900                 term.dirty[i] = 1;
 901 }
 902
 903 void
 904 tfulldirt(void)
 905 {
 906         tsetdirt(0, term.row-1);
 907 }
 908
 909 void
 910 tcursor(int mode) {
 911         static TCursor c;
 912
 913         if(mode == CURSOR_SAVE)
 914                 c = term.c;
 915         else if(mode == CURSOR_LOAD)
 916                 term.c = c, tmoveto(c.x, c.y);
 917 }
 918
 919 void
 920 treset(void) {
 921         unsigned i;
 922         term.c = (TCursor){{
 923                 .mode = ATTR_NULL,
 924                 .fg = DefaultFG,
 925                 .bg = DefaultBG
 926         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 927
 928         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 929         for(i = TAB; i < term.col; i += TAB)
 930                 term.tabs[i] = 1;
 931         term.top = 0, term.bot = term.row - 1;
 932         term.mode = MODE_WRAP;
 933         tclearregion(0, 0, term.col-1, term.row-1);
 934 }
 935
 936 void
 937 tnew(int col, int row) {
 938         /* set screen size */
 939         term.row = row, term.col = col;
 940         term.line = xmalloc(term.row * sizeof(Line));
 941         term.alt  = xmalloc(term.row * sizeof(Line));
 942         term.dirty = xmalloc(term.row * sizeof(*term.dirty));
 943         term.tabs = xmalloc(term.col * sizeof(*term.tabs));
 944
 945         for(row = 0; row < term.row; row++) {
 946                 term.line[row] = xmalloc(term.col * sizeof(Glyph));
 947                 term.alt [row] = xmalloc(term.col * sizeof(Glyph));
 948                 term.dirty[row] = 0;
 949         }
 950         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 951         /* setup screen */
 952         treset();
 953 }
 954
 955 void
 956 tswapscreen(void) {
 957         Line* tmp = term.line;
 958         term.line = term.alt;
 959         term.alt = tmp;
 960         term.mode ^= MODE_ALTSCREEN;
 961         tfulldirt();
 962 }
 963
 964 void
 965 tscrolldown(int orig, int n) {
 966         int i;
 967         Line temp;
 968
 969         LIMIT(n, 0, term.bot-orig+1);
 970
 971         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 972
 973         for(i = term.bot; i >= orig+n; i--) {
 974                 temp = term.line[i];
 975                 term.line[i] = term.line[i-n];
 976                 term.line[i-n] = temp;
 977
 978                 term.dirty[i] = 1;
 979                 term.dirty[i-n] = 1;
 980         }
 981
 982         selscroll(orig, n);
 983 }
 984
 985 void
 986 tscrollup(int orig, int n) {
 987         int i;
 988         Line temp;
 989         LIMIT(n, 0, term.bot-orig+1);
 990
 991         tclearregion(0, orig, term.col-1, orig+n-1);
 992
 993         for(i = orig; i <= term.bot-n; i++) {
 994                  temp = term.line[i];
 995                  term.line[i] = term.line[i+n];
 996                  term.line[i+n] = temp;
 997
 998                  term.dirty[i] = 1;
 999                  term.dirty[i+n] = 1;
1000         }
1001
1002         selscroll(orig, -n);
1003 }
1004
1005 void
1006 selscroll(int orig, int n) {
1007         if(sel.bx == -1)
1008                 return;
1009
1010         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
1011                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
1012                         sel.bx = -1;
1013                         return;
1014                 }
1015                 if(sel.by < term.top) {
1016                         sel.by = term.top;
1017                         sel.bx = 0;
1018                 }
1019                 if(sel.ey > term.bot) {
1020                         sel.ey = term.bot;
1021                         sel.ex = term.col;
1022                 }
1023                 sel.b.y = sel.by, sel.b.x = sel.bx;
1024                 sel.e.y = sel.ey, sel.e.x = sel.ex;
1025         }
1026 }
1027
1028 void
1029 tnewline(int first_col) {
1030         int y = term.c.y;
1031         if(y == term.bot)
1032                 tscrollup(term.top, 1);
1033         else
1034                 y++;
1035         tmoveto(first_col ? 0 : term.c.x, y);
1036 }
1037
1038 void
1039 csiparse(void) {
1040         /* int noarg = 1; */
1041         char *p = csiescseq.buf;
1042
1043         csiescseq.narg = 0;
1044         if(*p == '?')
1045                 csiescseq.priv = 1, p++;
1046
1047         while(p < csiescseq.buf+csiescseq.len) {
1048                 while(isdigit(*p)) {
1049                         csiescseq.arg[csiescseq.narg] *= 10;
1050                         csiescseq.arg[csiescseq.narg] += *p++ - '0'/*, noarg = 0 */;
1051                 }
1052                 if(*p == ';' && csiescseq.narg+1 < ESC_ARG_SIZ)
1053                         csiescseq.narg++, p++;
1054                 else {
1055                         csiescseq.mode = *p;
1056                         csiescseq.narg++;
1057                         return;
1058                 }
1059         }
1060 }
1061
1062 void
1063 tmoveto(int x, int y) {
1064         LIMIT(x, 0, term.col-1);
1065         LIMIT(y, 0, term.row-1);
1066         term.c.state &= ~CURSOR_WRAPNEXT;
1067         term.c.x = x;
1068         term.c.y = y;
1069 }
1070
1071 void
1072 tsetchar(char *c) {
1073         term.dirty[term.c.y] = 1;
1074         term.line[term.c.y][term.c.x] = term.c.attr;
1075         memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
1076         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
1077 }
1078
1079 void
1080 tclearregion(int x1, int y1, int x2, int y2) {
1081         int x, y, temp;
1082
1083         if(x1 > x2)
1084                 temp = x1, x1 = x2, x2 = temp;
1085         if(y1 > y2)
1086                 temp = y1, y1 = y2, y2 = temp;
1087
1088         LIMIT(x1, 0, term.col-1);
1089         LIMIT(x2, 0, term.col-1);
1090         LIMIT(y1, 0, term.row-1);
1091         LIMIT(y2, 0, term.row-1);
1092
1093         for(y = y1; y <= y2; y++) {
1094                 term.dirty[y] = 1;
1095                 for(x = x1; x <= x2; x++)
1096                         term.line[y][x].state = 0;
1097         }
1098 }
1099
1100 void
1101 tdeletechar(int n) {
1102         int src = term.c.x + n;
1103         int dst = term.c.x;
1104         int size = term.col - src;
1105
1106         term.dirty[term.c.y] = 1;
1107
1108         if(src >= term.col) {
1109                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1110                 return;
1111         }
1112         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1113         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1114 }
1115
1116 void
1117 tinsertblank(int n) {
1118         int src = term.c.x;
1119         int dst = src + n;
1120         int size = term.col - dst;
1121
1122         term.dirty[term.c.y] = 1;
1123
1124         if(dst >= term.col) {
1125                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1126                 return;
1127         }
1128         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1129         tclearregion(src, term.c.y, dst - 1, term.c.y);
1130 }
1131
1132 void
1133 tinsertblankline(int n) {
1134         if(term.c.y < term.top || term.c.y > term.bot)
1135                 return;
1136
1137         tscrolldown(term.c.y, n);
1138 }
1139
1140 void
1141 tdeleteline(int n) {
1142         if(term.c.y < term.top || term.c.y > term.bot)
1143                 return;
1144
1145         tscrollup(term.c.y, n);
1146 }
1147
1148 void
1149 tsetattr(int *attr, int l) {
1150         int i;
1151
1152         for(i = 0; i < l; i++) {
1153                 switch(attr[i]) {
1154                 case 0:
1155                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD \
1156                                         | ATTR_ITALIC | ATTR_BLINK);
1157                         term.c.attr.fg = DefaultFG;
1158                         term.c.attr.bg = DefaultBG;
1159                         break;
1160                 case 1:
1161                         term.c.attr.mode |= ATTR_BOLD;
1162                         break;
1163                 case 3: /* enter standout (highlight) */
1164                         term.c.attr.mode |= ATTR_ITALIC;
1165                         break;
1166                 case 4:
1167                         term.c.attr.mode |= ATTR_UNDERLINE;
1168                         break;
1169                 case 5:
1170                         term.c.attr.mode |= ATTR_BLINK;
1171                         break;
1172                 case 7:
1173                         term.c.attr.mode |= ATTR_REVERSE;
1174                         break;
1175                 case 21:
1176                 case 22:
1177                         term.c.attr.mode &= ~ATTR_BOLD;
1178                         break;
1179                 case 23: /* leave standout (highlight) mode */
1180                         term.c.attr.mode &= ~ATTR_ITALIC;
1181                         break;
1182                 case 24:
1183                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1184                         break;
1185                 case 25:
1186                         term.c.attr.mode &= ~ATTR_BLINK;
1187                         break;
1188                 case 27:
1189                         term.c.attr.mode &= ~ATTR_REVERSE;
1190                         break;
1191                 case 38:
1192                         if(i + 2 < l && attr[i + 1] == 5) {
1193                                 i += 2;
1194                                 if(BETWEEN(attr[i], 0, 255))
1195                                         term.c.attr.fg = attr[i];
1196                                 else
1197                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
1198                         }
1199                         else
1200                                 fprintf(stderr, "erresc(38): gfx attr %d unknown\n", attr[i]);
1201                         break;
1202                 case 39:
1203                         term.c.attr.fg = DefaultFG;
1204                         break;
1205                 case 48:
1206                         if(i + 2 < l && attr[i + 1] == 5) {
1207                                 i += 2;
1208                                 if(BETWEEN(attr[i], 0, 255))
1209                                         term.c.attr.bg = attr[i];
1210                                 else
1211                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
1212                         }
1213                         else
1214                                 fprintf(stderr, "erresc(48): gfx attr %d unknown\n", attr[i]);
1215                         break;
1216                 case 49:
1217                         term.c.attr.bg = DefaultBG;
1218                         break;
1219                 default:
1220                         if(BETWEEN(attr[i], 30, 37))
1221                                 term.c.attr.fg = attr[i] - 30;
1222                         else if(BETWEEN(attr[i], 40, 47))
1223                                 term.c.attr.bg = attr[i] - 40;
1224                         else if(BETWEEN(attr[i], 90, 97))
1225                                 term.c.attr.fg = attr[i] - 90 + 8;
1226                         else if(BETWEEN(attr[i], 100, 107))
1227                                 term.c.attr.bg = attr[i] - 100 + 8;
1228                         else
1229                                 fprintf(stderr, "erresc(default): gfx attr %d unknown\n", attr[i]), csidump();
1230                         break;
1231                 }
1232         }
1233 }
1234
1235 void
1236 tsetscroll(int t, int b) {
1237         int temp;
1238
1239         LIMIT(t, 0, term.row-1);
1240         LIMIT(b, 0, term.row-1);
1241         if(t > b) {
1242                 temp = t;
1243                 t = b;
1244                 b = temp;
1245         }
1246         term.top = t;
1247         term.bot = b;
1248 }
1249
1250 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1251
1252 void
1253 tsetmode(bool priv, bool set, int *args, int narg) {
1254         int *lim, mode;
1255
1256         for(lim = args + narg; args < lim; ++args) {
1257                 if(priv) {
1258                         switch(*args) {
1259                         case 1:
1260                                 MODBIT(term.mode, set, MODE_APPKEYPAD);
1261                                 break;
1262                         case 5: /* DECSCNM -- Reverve video */
1263                                 mode = term.mode;
1264                                 MODBIT(term.mode,set, MODE_REVERSE);
1265                                 if(mode != term.mode)
1266                                         redraw();
1267                                 break;
1268                         case 7:
1269                                 MODBIT(term.mode, set, MODE_WRAP);
1270                                 break;
1271                         case 20:
1272                                 MODBIT(term.mode, set, MODE_CRLF);
1273                                 break;
1274                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1275                                 break;
1276                         case 25:
1277                                 MODBIT(term.c.state, !set, CURSOR_HIDE);
1278                                 break;
1279                         case 1000: /* 1000,1002: enable xterm mouse report */
1280                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1281                                 break;
1282                         case 1002:
1283                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1284                                 break;
1285                         case 1049: /* = 1047 and 1048 */
1286                         case 47:
1287                         case 1047:
1288                                 if(IS_SET(MODE_ALTSCREEN))
1289                                         tclearregion(0, 0, term.col-1, term.row-1);
1290                                 if((set && !IS_SET(MODE_ALTSCREEN)) ||
1291                                     (!set && IS_SET(MODE_ALTSCREEN))) {
1292                                             tswapscreen();
1293                                 }
1294                                 if(*args != 1049)
1295                                         break;
1296                                 /* pass through */
1297                         case 1048:
1298                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1299                                 break;
1300                         default:
1301                                 fprintf(stderr,
1302                                         "erresc: unknown private set/reset mode %d\n",
1303                                         *args);
1304                                 break;
1305                         }
1306                 } else {
1307                         switch(*args) {
1308                         case 4:
1309                                 MODBIT(term.mode, set, MODE_INSERT);
1310                                 break;
1311                         default:
1312                                 fprintf(stderr,
1313                                         "erresc: unknown set/reset mode %d\n",
1314                                         *args);
1315                                 break;
1316                         }
1317                 }
1318         }
1319 }
1320 #undef MODBIT
1321
1322
1323 void
1324 csihandle(void) {
1325         switch(csiescseq.mode) {
1326         default:
1327         unknown:
1328                 fprintf(stderr, "erresc: unknown csi ");
1329                 csidump();
1330                 /* die(""); */
1331                 break;
1332         case '@': /* ICH -- Insert <n> blank char */
1333                 DEFAULT(csiescseq.arg[0], 1);
1334                 tinsertblank(csiescseq.arg[0]);
1335                 break;
1336         case 'A': /* CUU -- Cursor <n> Up */
1337         case 'e':
1338                 DEFAULT(csiescseq.arg[0], 1);
1339                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1340                 break;
1341         case 'B': /* CUD -- Cursor <n> Down */
1342                 DEFAULT(csiescseq.arg[0], 1);
1343                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1344                 break;
1345         case 'C': /* CUF -- Cursor <n> Forward */
1346         case 'a':
1347                 DEFAULT(csiescseq.arg[0], 1);
1348                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1349                 break;
1350         case 'D': /* CUB -- Cursor <n> Backward */
1351                 DEFAULT(csiescseq.arg[0], 1);
1352                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1353                 break;
1354         case 'E': /* CNL -- Cursor <n> Down and first col */
1355                 DEFAULT(csiescseq.arg[0], 1);
1356                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1357                 break;
1358         case 'F': /* CPL -- Cursor <n> Up and first col */
1359                 DEFAULT(csiescseq.arg[0], 1);
1360                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1361                 break;
1362         case 'g': /* TBC -- Tabulation clear */
1363                 switch (csiescseq.arg[0]) {
1364                 case 0: /* clear current tab stop */
1365                         term.tabs[term.c.x] = 0;
1366                         break;
1367                 case 3: /* clear all the tabs */
1368                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1369                         break;
1370                 default:
1371                         goto unknown;
1372                 }
1373                 break;
1374         case 'G': /* CHA -- Move to <col> */
1375         case '`': /* HPA */
1376                 DEFAULT(csiescseq.arg[0], 1);
1377                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1378                 break;
1379         case 'H': /* CUP -- Move to <row> <col> */
1380         case 'f': /* HVP */
1381                 DEFAULT(csiescseq.arg[0], 1);
1382                 DEFAULT(csiescseq.arg[1], 1);
1383                 tmoveto(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1384                 break;
1385         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1386                 DEFAULT(csiescseq.arg[0], 1);
1387                 while(csiescseq.arg[0]--)
1388                         tputtab(1);
1389                 break;
1390         case 'J': /* ED -- Clear screen */
1391                 sel.bx = -1;
1392                 switch(csiescseq.arg[0]) {
1393                 case 0: /* below */
1394                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1395                         if(term.c.y < term.row-1)
1396                                 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1397                         break;
1398                 case 1: /* above */
1399                         if(term.c.y > 1)
1400                                 tclearregion(0, 0, term.col-1, term.c.y-1);
1401                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1402                         break;
1403                 case 2: /* all */
1404                         tclearregion(0, 0, term.col-1, term.row-1);
1405                         break;
1406                 default:
1407                         goto unknown;
1408                 }
1409                 break;
1410         case 'K': /* EL -- Clear line */
1411                 switch(csiescseq.arg[0]) {
1412                 case 0: /* right */
1413                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1414                         break;
1415                 case 1: /* left */
1416                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1417                         break;
1418                 case 2: /* all */
1419                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1420                         break;
1421                 }
1422                 break;
1423         case 'S': /* SU -- Scroll <n> line up */
1424                 DEFAULT(csiescseq.arg[0], 1);
1425                 tscrollup(term.top, csiescseq.arg[0]);
1426                 break;
1427         case 'T': /* SD -- Scroll <n> line down */
1428                 DEFAULT(csiescseq.arg[0], 1);
1429                 tscrolldown(term.top, csiescseq.arg[0]);
1430                 break;
1431         case 'L': /* IL -- Insert <n> blank lines */
1432                 DEFAULT(csiescseq.arg[0], 1);
1433                 tinsertblankline(csiescseq.arg[0]);
1434                 break;
1435         case 'l': /* RM -- Reset Mode */
1436                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1437                 break;
1438         case 'M': /* DL -- Delete <n> lines */
1439                 DEFAULT(csiescseq.arg[0], 1);
1440                 tdeleteline(csiescseq.arg[0]);
1441                 break;
1442         case 'X': /* ECH -- Erase <n> char */
1443                 DEFAULT(csiescseq.arg[0], 1);
1444                 tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0], term.c.y);
1445                 break;
1446         case 'P': /* DCH -- Delete <n> char */
1447                 DEFAULT(csiescseq.arg[0], 1);
1448                 tdeletechar(csiescseq.arg[0]);
1449                 break;
1450         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1451                 DEFAULT(csiescseq.arg[0], 1);
1452                 while(csiescseq.arg[0]--)
1453                         tputtab(0);
1454                 break;
1455         case 'd': /* VPA -- Move to <row> */
1456                 DEFAULT(csiescseq.arg[0], 1);
1457                 tmoveto(term.c.x, csiescseq.arg[0]-1);
1458                 break;
1459         case 'h': /* SM -- Set terminal mode */
1460                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1461                 break;
1462         case 'm': /* SGR -- Terminal attribute (color) */
1463                 tsetattr(csiescseq.arg, csiescseq.narg);
1464                 break;
1465         case 'r': /* DECSTBM -- Set Scrolling Region */
1466                 if(csiescseq.priv)
1467                         goto unknown;
1468                 else {
1469                         DEFAULT(csiescseq.arg[0], 1);
1470                         DEFAULT(csiescseq.arg[1], term.row);
1471                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1472                         tmoveto(0, 0);
1473                 }
1474                 break;
1475         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1476                 tcursor(CURSOR_SAVE);
1477                 break;
1478         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1479                 tcursor(CURSOR_LOAD);
1480                 break;
1481         }
1482 }
1483
1484 void
1485 csidump(void) {
1486         int i;
1487         printf("ESC[");
1488         for(i = 0; i < csiescseq.len; i++) {
1489                 uint c = csiescseq.buf[i] & 0xff;
1490                 if(isprint(c)) putchar(c);
1491                 else if(c == '\n') printf("(\\n)");
1492                 else if(c == '\r') printf("(\\r)");
1493                 else if(c == 0x1b) printf("(\\e)");
1494                 else printf("(%02x)", c);
1495         }
1496         putchar('\n');
1497 }
1498
1499 void
1500 csireset(void) {
1501         memset(&csiescseq, 0, sizeof(csiescseq));
1502 }
1503
1504 void
1505 strhandle(void) {
1506         char *p;
1507
1508         /*
1509          * TODO: make this being useful in case of color palette change.
1510          */
1511         strparse();
1512
1513         p = strescseq.buf;
1514
1515         switch(strescseq.type) {
1516         case ']': /* OSC -- Operating System Command */
1517                 switch(p[0]) {
1518                 case '0':
1519                 case '1':
1520                 case '2':
1521                         /*
1522                          * TODO: Handle special chars in string, like umlauts.
1523                          */
1524                         if(p[1] == ';') {
1525                                 XStoreName(xw.dpy, xw.win, strescseq.buf+2);
1526                         }
1527                         break;
1528                 case ';':
1529                         XStoreName(xw.dpy, xw.win, strescseq.buf+1);
1530                         break;
1531                 case '4': /* TODO: Set color (arg0) to "rgb:%hexr/$hexg/$hexb" (arg1) */
1532                         break;
1533                 default:
1534                         fprintf(stderr, "erresc: unknown str ");
1535                         strdump();
1536                         break;
1537                 }
1538                 break;
1539         case 'k': /* old title set compatibility */
1540                 XStoreName(xw.dpy, xw.win, strescseq.buf);
1541                 break;
1542         case 'P': /* DSC -- Device Control String */
1543         case '_': /* APC -- Application Program Command */
1544         case '^': /* PM -- Privacy Message */
1545         default:
1546                 fprintf(stderr, "erresc: unknown str ");
1547                 strdump();
1548                 /* die(""); */
1549                 break;
1550         }
1551 }
1552
1553 void
1554 strparse(void) {
1555         /*
1556          * TODO: Implement parsing like for CSI when required.
1557          * Format: ESC type cmd ';' arg0 [';' argn] ESC \
1558          */
1559         return;
1560 }
1561
1562 void
1563 strdump(void) {
1564         int i;
1565         printf("ESC%c", strescseq.type);
1566         for(i = 0; i < strescseq.len; i++) {
1567                 uint c = strescseq.buf[i] & 0xff;
1568                 if(isprint(c)) putchar(c);
1569                 else if(c == '\n') printf("(\\n)");
1570                 else if(c == '\r') printf("(\\r)");
1571                 else if(c == 0x1b) printf("(\\e)");
1572                 else printf("(%02x)", c);
1573         }
1574         printf("ESC\\\n");
1575 }
1576
1577 void
1578 strreset(void) {
1579         memset(&strescseq, 0, sizeof(strescseq));
1580 }
1581
1582 void
1583 tputtab(bool forward) {
1584         unsigned x = term.c.x;
1585
1586         if(forward) {
1587                 if(x == term.col)
1588                         return;
1589                 for(++x; x < term.col && !term.tabs[x]; ++x)
1590                         /* nothing */ ;
1591         } else {
1592                 if(x == 0)
1593                         return;
1594                 for(--x; x > 0 && !term.tabs[x]; --x)
1595                         /* nothing */ ;
1596         }
1597         tmoveto(x, term.c.y);
1598 }
1599
1600 void
1601 tputc(char *c) {
1602         char ascii = *c;
1603
1604         if(iofd != -1)
1605                 write(iofd, c, 1);
1606
1607         if(term.esc & ESC_START) {
1608                 if(term.esc & ESC_CSI) {
1609                         csiescseq.buf[csiescseq.len++] = ascii;
1610                         if(BETWEEN(ascii, 0x40, 0x7E) || csiescseq.len >= ESC_BUF_SIZ) {
1611                                 term.esc = 0;
1612                                 csiparse(), csihandle();
1613                         }
1614                 } else if(term.esc & ESC_STR) {
1615                         switch(ascii) {
1616                         case '\033':
1617                                 term.esc = ESC_START | ESC_STR_END;
1618                                 break;
1619                         case '\a': /* backwards compatibility to xterm */
1620                                 term.esc = 0;
1621                                 strhandle();
1622                                 break;
1623                         default:
1624                                 strescseq.buf[strescseq.len++] = ascii;
1625                                 if(strescseq.len+1 >= STR_BUF_SIZ) {
1626                                         term.esc = 0;
1627                                         strhandle();
1628                                 }
1629                         }
1630                 } else if(term.esc & ESC_STR_END) {
1631                         term.esc = 0;
1632                         if(ascii == '\\')
1633                                 strhandle();
1634                 } else if(term.esc & ESC_ALTCHARSET) {
1635                         switch(ascii) {
1636                         case '0': /* Line drawing crap */
1637                                 term.c.attr.mode |= ATTR_GFX;
1638                                 break;
1639                         case 'B': /* Back to regular text */
1640                                 term.c.attr.mode &= ~ATTR_GFX;
1641                                 break;
1642                         default:
1643                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1644                         }
1645                         term.esc = 0;
1646                 } else {
1647                         switch(ascii) {
1648                         case '[':
1649                                 term.esc |= ESC_CSI;
1650                                 break;
1651                         case 'P': /* DCS -- Device Control String */
1652                         case '_': /* APC -- Application Program Command */
1653                         case '^': /* PM -- Privacy Message */
1654                         case ']': /* OSC -- Operating System Command */
1655                         case 'k': /* old title set compatibility */
1656                                 strreset();
1657                                 strescseq.type = ascii;
1658                                 term.esc |= ESC_STR;
1659                                 break;
1660                         case '(':
1661                                 term.esc |= ESC_ALTCHARSET;
1662                                 break;
1663                         case 'D': /* IND -- Linefeed */
1664                                 if(term.c.y == term.bot)
1665                                         tscrollup(term.top, 1);
1666                                 else
1667                                         tmoveto(term.c.x, term.c.y+1);
1668                                 term.esc = 0;
1669                                 break;
1670                         case 'E': /* NEL -- Next line */
1671                                 tnewline(1); /* always go to first col */
1672                                 term.esc = 0;
1673                                 break;
1674                         case 'H': /* HTS -- Horizontal tab stop */
1675                                 term.tabs[term.c.x] = 1;
1676                                 term.esc = 0;
1677                                 break;
1678                         case 'M': /* RI -- Reverse index */
1679                                 if(term.c.y == term.top)
1680                                         tscrolldown(term.top, 1);
1681                                 else
1682                                         tmoveto(term.c.x, term.c.y-1);
1683                                 term.esc = 0;
1684                                 break;
1685                         case 'c': /* RIS -- Reset to inital state */
1686                                 treset();
1687                                 term.esc = 0;
1688                                 xresettitle();
1689                                 break;
1690                         case '=': /* DECPAM -- Application keypad */
1691                                 term.mode |= MODE_APPKEYPAD;
1692                                 term.esc = 0;
1693                                 break;
1694                         case '>': /* DECPNM -- Normal keypad */
1695                                 term.mode &= ~MODE_APPKEYPAD;
1696                                 term.esc = 0;
1697                                 break;
1698                         case '7': /* DECSC -- Save Cursor */
1699                                 tcursor(CURSOR_SAVE);
1700                                 term.esc = 0;
1701                                 break;
1702                         case '8': /* DECRC -- Restore Cursor */
1703                                 tcursor(CURSOR_LOAD);
1704                                 term.esc = 0;
1705                                 break;
1706                         case '\\': /* ST -- Stop */
1707                                 term.esc = 0;
1708                                 break;
1709                         default:
1710                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1711                                     (uchar) ascii, isprint(ascii)?ascii:'.');
1712                                 term.esc = 0;
1713                         }
1714                 }
1715         } else {
1716                 if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
1717                         sel.bx = -1;
1718                 switch(ascii) {
1719                 case '\t':
1720                         tputtab(1);
1721                         break;
1722                 case '\b':
1723                         tmoveto(term.c.x-1, term.c.y);
1724                         break;
1725                 case '\r':
1726                         tmoveto(0, term.c.y);
1727                         break;
1728                 case '\f':
1729                 case '\v':
1730                 case '\n':
1731                         /* go to first col if the mode is set */
1732                         tnewline(IS_SET(MODE_CRLF));
1733                         break;
1734                 case '\a':
1735                         if(!(xw.state & WIN_FOCUSED))
1736                                 xseturgency(1);
1737                         break;
1738                 case '\033':
1739                         csireset();
1740                         term.esc = ESC_START;
1741                         break;
1742                 default:
1743                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1744                                 tnewline(1); /* always go to first col */
1745                         tsetchar(c);
1746                         if(term.c.x+1 < term.col)
1747                                 tmoveto(term.c.x+1, term.c.y);
1748                         else
1749                                 term.c.state |= CURSOR_WRAPNEXT;
1750                 }
1751         }
1752 }
1753
1754 int
1755 tresize(int col, int row) {
1756         int i, x;
1757         int minrow = MIN(row, term.row);
1758         int mincol = MIN(col, term.col);
1759         int slide = term.c.y - row + 1;
1760
1761         if(col < 1 || row < 1)
1762                 return 0;
1763
1764         /* free unneeded rows */
1765         i = 0;
1766         if(slide > 0) {
1767                 /* slide screen to keep cursor where we expect it -
1768                  * tscrollup would work here, but we can optimize to
1769                  * memmove because we're freeing the earlier lines */
1770                 for(/* i = 0 */; i < slide; i++) {
1771                         free(term.line[i]);
1772                         free(term.alt[i]);
1773                 }
1774                 memmove(term.line, term.line + slide, row * sizeof(Line));
1775                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1776         }
1777         for(i += row; i < term.row; i++) {
1778                 free(term.line[i]);
1779                 free(term.alt[i]);
1780         }
1781
1782         /* resize to new height */
1783         term.line = xrealloc(term.line, row * sizeof(Line));
1784         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
1785         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
1786         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
1787
1788         /* resize each row to new width, zero-pad if needed */
1789         for(i = 0; i < minrow; i++) {
1790                 term.dirty[i] = 1;
1791                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
1792                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
1793                 for(x = mincol; x < col; x++) {
1794                         term.line[i][x].state = 0;
1795                         term.alt[i][x].state = 0;
1796                 }
1797         }
1798
1799         /* allocate any new rows */
1800         for(/* i == minrow */; i < row; i++) {
1801                 term.dirty[i] = 1;
1802                 term.line[i] = calloc(col, sizeof(Glyph));
1803                 term.alt [i] = calloc(col, sizeof(Glyph));
1804         }
1805         if(col > term.col) {
1806                 bool *bp = term.tabs + term.col;
1807
1808                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
1809                 while(--bp > term.tabs && !*bp)
1810                         /* nothing */ ;
1811                 for(bp += TAB; bp < term.tabs + col; bp += TAB)
1812                         *bp = 1;
1813         }
1814         /* update terminal size */
1815         term.col = col, term.row = row;
1816         /* make use of the LIMIT in tmoveto */
1817         tmoveto(term.c.x, term.c.y);
1818         /* reset scrolling region */
1819         tsetscroll(0, row-1);
1820
1821         return (slide > 0);
1822 }
1823
1824 void
1825 xresize(int col, int row) {
1826         xw.w = MAX(1, 2*BORDER + col * xw.cw);
1827         xw.h = MAX(1, 2*BORDER + row * xw.ch);
1828 }
1829
1830 void
1831 xloadcols(void) {
1832         int i, r, g, b;
1833         XColor color;
1834         ulong white = WhitePixel(xw.dpy, xw.scr);
1835
1836         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
1837         for(i = 0; i < LEN(colorname); i++) {
1838                 if(!colorname[i])
1839                         continue;
1840                 if(!XAllocNamedColor(xw.dpy, xw.cmap, colorname[i], &color, &color)) {
1841                         dc.col[i] = white;
1842                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1843                 } else
1844                         dc.col[i] = color.pixel;
1845         }
1846
1847         /* load colors [16-255] ; same colors as xterm */
1848         for(i = 16, r = 0; r < 6; r++)
1849                 for(g = 0; g < 6; g++)
1850                         for(b = 0; b < 6; b++) {
1851                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1852                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1853                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1854                                 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1855                                         dc.col[i] = white;
1856                                         fprintf(stderr, "Could not allocate color %d\n", i);
1857                                 } else
1858                                         dc.col[i] = color.pixel;
1859                                 i++;
1860                         }
1861
1862         for(r = 0; r < 24; r++, i++) {
1863                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1864                 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1865                         dc.col[i] = white;
1866                         fprintf(stderr, "Could not allocate color %d\n", i);
1867                 } else
1868                         dc.col[i] = color.pixel;
1869         }
1870 }
1871
1872 void
1873 xclear(int x1, int y1, int x2, int y2) {
1874         XSetForeground(xw.dpy, dc.gc, dc.col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG]);
1875         XFillRectangle(xw.dpy, xw.buf, dc.gc,
1876                        BORDER + x1 * xw.cw, BORDER + y1 * xw.ch,
1877                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1878 }
1879
1880 void
1881 xhints(void) {
1882         XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
1883         XWMHints wm = {.flags = InputHint, .input = 1};
1884         XSizeHints *sizeh = NULL;
1885
1886         sizeh = XAllocSizeHints();
1887         if(xw.isfixed == False) {
1888                 sizeh->flags = PSize | PResizeInc | PBaseSize;
1889                 sizeh->height = xw.h;
1890                 sizeh->width = xw.w;
1891                 sizeh->height_inc = xw.ch;
1892                 sizeh->width_inc = xw.cw;
1893                 sizeh->base_height = 2*BORDER;
1894                 sizeh->base_width = 2*BORDER;
1895         } else {
1896                 sizeh->flags = PMaxSize | PMinSize;
1897                 sizeh->min_width = sizeh->max_width = xw.fw;
1898                 sizeh->min_height = sizeh->max_height = xw.fh;
1899         }
1900
1901         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
1902         XFree(sizeh);
1903 }
1904
1905 XFontSet
1906 xinitfont(char *fontstr) {
1907         XFontSet set;
1908         char *def, **missing;
1909         int n;
1910
1911         missing = NULL;
1912         set = XCreateFontSet(xw.dpy, fontstr, &missing, &n, &def);
1913         if(missing) {
1914                 while(n--)
1915                         fprintf(stderr, "st: missing fontset: %s\n", missing[n]);
1916                 XFreeStringList(missing);
1917         }
1918         return set;
1919 }
1920
1921 void
1922 xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rbearing) {
1923         XFontStruct **xfonts;
1924         char **font_names;
1925         int i, n;
1926
1927         *ascent = *descent = *lbearing = *rbearing = 0;
1928         n = XFontsOfFontSet(set, &xfonts, &font_names);
1929         for(i = 0; i < n; i++) {
1930                 *ascent = MAX(*ascent, (*xfonts)->ascent);
1931                 *descent = MAX(*descent, (*xfonts)->descent);
1932                 *lbearing = MAX(*lbearing, (*xfonts)->min_bounds.lbearing);
1933                 *rbearing = MAX(*rbearing, (*xfonts)->max_bounds.rbearing);
1934                 xfonts++;
1935         }
1936 }
1937
1938 void
1939 initfonts(char *fontstr, char *bfontstr, char *ifontstr) {
1940         if((dc.font.set = xinitfont(fontstr)) == NULL)
1941                 die("Can't load font %s\n", fontstr);
1942         if((dc.bfont.set = xinitfont(bfontstr)) == NULL)
1943                 die("Can't load bfont %s\n", bfontstr);
1944         if((dc.ifont.set = xinitfont(ifontstr)) == NULL)
1945                 die("Can't load ifont %s\n", ifontstr);
1946
1947         xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1948             &dc.font.lbearing, &dc.font.rbearing);
1949         xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1950             &dc.bfont.lbearing, &dc.bfont.rbearing);
1951         xgetfontinfo(dc.ifont.set, &dc.ifont.ascent, &dc.ifont.descent,
1952             &dc.ifont.lbearing, &dc.ifont.rbearing);
1953 }
1954
1955 void
1956 xinit(void) {
1957         XSetWindowAttributes attrs;
1958         Cursor cursor;
1959         Window parent;
1960         int sw, sh;
1961
1962         if(!(xw.dpy = XOpenDisplay(NULL)))
1963                 die("Can't open display\n");
1964         xw.scr = XDefaultScreen(xw.dpy);
1965
1966         /* font */
1967         initfonts(FONT, BOLDFONT, ITALICFONT);
1968
1969         /* XXX: Assuming same size for bold font */
1970         xw.cw = dc.font.rbearing - dc.font.lbearing;
1971         xw.ch = dc.font.ascent + dc.font.descent;
1972
1973         /* colors */
1974         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1975         xloadcols();
1976
1977         /* adjust fixed window geometry */
1978         if(xw.isfixed) {
1979                 sw = DisplayWidth(xw.dpy, xw.scr);
1980                 sh = DisplayHeight(xw.dpy, xw.scr);
1981                 if(xw.fx < 0)
1982                         xw.fx = sw + xw.fx - xw.fw - 1;
1983                 if(xw.fy < 0)
1984                         xw.fy = sh + xw.fy - xw.fh - 1;
1985
1986                 xw.h = xw.fh;
1987                 xw.w = xw.fw;
1988         } else {
1989                 /* window - default size */
1990                 xw.h = 2*BORDER + term.row * xw.ch;
1991                 xw.w = 2*BORDER + term.col * xw.cw;
1992                 xw.fx = 0;
1993                 xw.fy = 0;
1994         }
1995
1996         attrs.background_pixel = dc.col[DefaultBG];
1997         attrs.border_pixel = dc.col[DefaultBG];
1998         attrs.bit_gravity = NorthWestGravity;
1999         attrs.event_mask = FocusChangeMask | KeyPressMask
2000                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
2001                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
2002         attrs.colormap = xw.cmap;
2003
2004         parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
2005         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
2006                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
2007                         XDefaultVisual(xw.dpy, xw.scr),
2008                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
2009                         | CWColormap,
2010                         &attrs);
2011         xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win, XdbeCopied);
2012
2013
2014         /* input methods */
2015         xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
2016         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
2017                                            | XIMStatusNothing, XNClientWindow, xw.win,
2018                                            XNFocusWindow, xw.win, NULL);
2019         /* gc */
2020         dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
2021
2022         /* white cursor, black outline */
2023         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
2024         XDefineCursor(xw.dpy, xw.win, cursor);
2025         XRecolorCursor(xw.dpy, cursor,
2026                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
2027                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
2028
2029         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
2030
2031         xresettitle();
2032         XMapWindow(xw.dpy, xw.win);
2033         xhints();
2034         XSync(xw.dpy, 0);
2035 }
2036
2037 void
2038 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
2039         int fg = base.fg, bg = base.bg, temp;
2040         int winx = BORDER+x*xw.cw, winy = BORDER+y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
2041         XFontSet fontset = dc.font.set;
2042         int i;
2043
2044         /* only switch default fg/bg if term is in RV mode */
2045         if(IS_SET(MODE_REVERSE)) {
2046                 if(fg == DefaultFG)
2047                         fg = DefaultBG;
2048                 if(bg == DefaultBG)
2049                         bg = DefaultFG;
2050         }
2051
2052         if(base.mode & ATTR_REVERSE)
2053                 temp = fg, fg = bg, bg = temp;
2054
2055         if(base.mode & ATTR_BOLD) {
2056                 fg += 8;
2057                 fontset = dc.bfont.set;
2058         }
2059
2060         if(base.mode & ATTR_ITALIC)
2061                 fontset = dc.ifont.set;
2062
2063         XSetBackground(xw.dpy, dc.gc, dc.col[bg]);
2064         XSetForeground(xw.dpy, dc.gc, dc.col[fg]);
2065
2066         if(base.mode & ATTR_GFX) {
2067                 for(i = 0; i < bytelen; i++) {
2068                         char c = gfx[(uint)s[i] % 256];
2069                         if(c)
2070                                 s[i] = c;
2071                         else if(s[i] > 0x5f)
2072                                 s[i] -= 0x5f;
2073                 }
2074         }
2075
2076         XmbDrawImageString(xw.dpy, xw.buf, fontset, dc.gc, winx, winy, s, bytelen);
2077
2078         if(base.mode & ATTR_UNDERLINE)
2079                 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
2080 }
2081
2082 /* copy buffer pixmap to screen pixmap */
2083 void
2084 xcopy() {
2085         XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
2086         XdbeSwapBuffers(xw.dpy, swpinfo, 1);
2087 }
2088
2089 void
2090 xdrawcursor(void) {
2091         static int oldx = 0;
2092         static int oldy = 0;
2093         int sl;
2094         Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
2095
2096         LIMIT(oldx, 0, term.col-1);
2097         LIMIT(oldy, 0, term.row-1);
2098
2099         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
2100                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
2101
2102         /* remove the old cursor */
2103         if(term.line[oldy][oldx].state & GLYPH_SET) {
2104                 sl = utf8size(term.line[oldy][oldx].c);
2105                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
2106         } else
2107                 xclear(oldx, oldy, oldx, oldy);
2108
2109         xcopy();
2110
2111         /* draw the new one */
2112         if(!(term.c.state & CURSOR_HIDE)) {
2113                 if(!(xw.state & WIN_FOCUSED))
2114                         g.bg = DefaultUCS;
2115
2116                 if(IS_SET(MODE_REVERSE))
2117                         g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
2118
2119                 sl = utf8size(g.c);
2120                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
2121                 oldx = term.c.x, oldy = term.c.y;
2122         }
2123
2124         xcopy();
2125 }
2126
2127 void
2128 xresettitle(void) {
2129         XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
2130 }
2131
2132 void
2133 redraw(void) {
2134         struct timespec tv = {0, REDRAW_TIMEOUT * 1000};
2135         tfulldirt();
2136         draw();
2137         nanosleep(&tv, NULL);
2138 }
2139
2140 void
2141 draw() {
2142         drawregion(0, 0, term.col, term.row);
2143         xcopy();
2144         gettimeofday(&xw.lastdraw, NULL);
2145 }
2146
2147 void
2148 drawregion(int x1, int y1, int x2, int y2) {
2149         int ic, ib, x, y, ox, sl;
2150         Glyph base, new;
2151         char buf[DRAW_BUF_SIZ];
2152         bool ena_sel = sel.bx != -1, alt = IS_SET(MODE_ALTSCREEN);
2153
2154         if((sel.alt && !alt) || (!sel.alt && alt))
2155                 ena_sel = 0;
2156         if(!(xw.state & WIN_VISIBLE))
2157                 return;
2158
2159         for(y = y1; y < y2; y++) {
2160                 if(!term.dirty[y])
2161                         continue;
2162                 xclear(0, y, term.col, y);
2163                 term.dirty[y] = 0;
2164                 base = term.line[y][0];
2165                 ic = ib = ox = 0;
2166                 for(x = x1; x < x2; x++) {
2167                         new = term.line[y][x];
2168                         if(ena_sel && *(new.c) && selected(x, y))
2169                                 new.mode ^= ATTR_REVERSE;
2170                         if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
2171                                                   ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
2172                                 xdraws(buf, base, ox, y, ic, ib);
2173                                 ic = ib = 0;
2174                         }
2175                         if(new.state & GLYPH_SET) {
2176                                 if(ib == 0) {
2177                                         ox = x;
2178                                         base = new;
2179                                 }
2180                                 sl = utf8size(new.c);
2181                                 memcpy(buf+ib, new.c, sl);
2182                                 ib += sl;
2183                                 ++ic;
2184                         }
2185                 }
2186                 if(ib > 0)
2187                         xdraws(buf, base, ox, y, ic, ib);
2188         }
2189         xdrawcursor();
2190 }
2191
2192 void
2193 expose(XEvent *ev) {
2194         XExposeEvent *e = &ev->xexpose;
2195         if(xw.state & WIN_REDRAW) {
2196                 if(!e->count)
2197                         xw.state &= ~WIN_REDRAW;
2198         }
2199         xcopy();
2200 }
2201
2202 void
2203 visibility(XEvent *ev) {
2204         XVisibilityEvent *e = &ev->xvisibility;
2205         if(e->state == VisibilityFullyObscured)
2206                 xw.state &= ~WIN_VISIBLE;
2207         else if(!(xw.state & WIN_VISIBLE))
2208                 /* need a full redraw for next Expose, not just a buf copy */
2209                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
2210 }
2211
2212 void
2213 unmap(XEvent *ev) {
2214         xw.state &= ~WIN_VISIBLE;
2215 }
2216
2217 void
2218 xseturgency(int add) {
2219         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
2220         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
2221         XSetWMHints(xw.dpy, xw.win, h);
2222         XFree(h);
2223 }
2224
2225 void
2226 focus(XEvent *ev) {
2227         if(ev->type == FocusIn) {
2228                 xw.state |= WIN_FOCUSED;
2229                 xseturgency(0);
2230         } else
2231                 xw.state &= ~WIN_FOCUSED;
2232         draw();
2233 }
2234
2235 char*
2236 kmap(KeySym k, uint state) {
2237         int i;
2238         state &= ~Mod2Mask;
2239         for(i = 0; i < LEN(key); i++) {
2240                 uint mask = key[i].mask;
2241                 if(key[i].k == k && ((state & mask) == mask || (mask == XK_NO_MOD && !state)))
2242                         return (char*)key[i].s;
2243         }
2244         return NULL;
2245 }
2246
2247 void
2248 kpress(XEvent *ev) {
2249         XKeyEvent *e = &ev->xkey;
2250         KeySym ksym;
2251         char buf[32];
2252         char *customkey;
2253         int len;
2254         int meta;
2255         int shift;
2256         Status status;
2257
2258         meta = e->state & Mod1Mask;
2259         shift = e->state & ShiftMask;
2260         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
2261
2262         /* 1. custom keys from config.h */
2263         if((customkey = kmap(ksym, e->state)))
2264                 ttywrite(customkey, strlen(customkey));
2265         /* 2. hardcoded (overrides X lookup) */
2266         else
2267                 switch(ksym) {
2268                 case XK_Up:
2269                 case XK_Down:
2270                 case XK_Left:
2271                 case XK_Right:
2272                         /* XXX: shift up/down doesn't work */
2273                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
2274                         ttywrite(buf, 3);
2275                         break;
2276                 case XK_Insert:
2277                         if(shift)
2278                                 selpaste();
2279                         break;
2280                 case XK_Return:
2281                         if(IS_SET(MODE_CRLF))
2282                                 ttywrite("\r\n", 2);
2283                         else
2284                                 ttywrite("\r", 1);
2285                         break;
2286                         /* 3. X lookup  */
2287                 default:
2288                         if(len > 0) {
2289                                 if(meta && len == 1)
2290                                         ttywrite("\033", 1);
2291                                 ttywrite(buf, len);
2292                         }
2293                         break;
2294                 }
2295 }
2296
2297 void
2298 cmessage(XEvent *e) {
2299         /* See xembed specs
2300            http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
2301         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
2302                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
2303                         xw.state |= WIN_FOCUSED;
2304                         xseturgency(0);
2305                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
2306                         xw.state &= ~WIN_FOCUSED;
2307                 }
2308                 draw();
2309         }
2310 }
2311
2312 void
2313 resize(XEvent *e) {
2314         int col, row;
2315
2316         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
2317                 return;
2318
2319         xw.w = e->xconfigure.width;
2320         xw.h = e->xconfigure.height;
2321         col = (xw.w - 2*BORDER) / xw.cw;
2322         row = (xw.h - 2*BORDER) / xw.ch;
2323         if(col == term.col && row == term.row)
2324                 return;
2325         if(tresize(col, row))
2326                 draw();
2327         xresize(col, row);
2328         ttyresize(col, row);
2329 }
2330
2331 bool
2332 last_draw_too_old(void) {
2333         struct timeval now;
2334         gettimeofday(&now, NULL);
2335         return TIMEDIFF(now, xw.lastdraw) >= DRAW_TIMEOUT/1000;
2336 }
2337
2338 void
2339 run(void) {
2340         XEvent ev;
2341         fd_set rfd;
2342         int xfd = XConnectionNumber(xw.dpy);
2343         struct timeval timeout = {0};
2344         bool stuff_to_print = 0;
2345
2346         for(;;) {
2347                 FD_ZERO(&rfd);
2348                 FD_SET(cmdfd, &rfd);
2349                 FD_SET(xfd, &rfd);
2350                 timeout.tv_sec  = 0;
2351                 timeout.tv_usec = SELECT_TIMEOUT;
2352                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, &timeout) < 0) {
2353                         if(errno == EINTR)
2354                                 continue;
2355                         die("select failed: %s\n", SERRNO);
2356                 }
2357                 if(FD_ISSET(cmdfd, &rfd)) {
2358                         ttyread();
2359                         stuff_to_print = 1;
2360                 }
2361
2362                 if(stuff_to_print && last_draw_too_old()) {
2363                         stuff_to_print = 0;
2364                         draw();
2365                 }
2366
2367                 while(XPending(xw.dpy)) {
2368                         XNextEvent(xw.dpy, &ev);
2369                         if(XFilterEvent(&ev, xw.win))
2370                                 continue;
2371                         if(handler[ev.type])
2372                                 (handler[ev.type])(&ev);
2373                 }
2374         }
2375 }
2376
2377 int
2378 main(int argc, char *argv[]) {
2379         int i, bitm, xr, yr;
2380         unsigned int wr, hr;
2381
2382         xw.fw = xw.fh = xw.fx = xw.fy = 0;
2383         xw.isfixed = False;
2384
2385         for(i = 1; i < argc; i++) {
2386                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
2387                 case 't':
2388                         if(++i < argc) opt_title = argv[i];
2389                         break;
2390                 case 'c':
2391                         if(++i < argc) opt_class = argv[i];
2392                         break;
2393                 case 'w':
2394                         if(++i < argc) opt_embed = argv[i];
2395                         break;
2396                 case 'f':
2397                         if(++i < argc) opt_io = argv[i];
2398                         break;
2399                 case 'e':
2400                         /* eat every remaining arguments */
2401                         if(++i < argc) opt_cmd = &argv[i];
2402                         goto run;
2403                 case 'g':
2404                         if(++i >= argc)
2405                                 break;
2406
2407                         bitm = XParseGeometry(argv[i], &xr, &yr, &wr, &hr);
2408                         if(bitm & XValue)
2409                                 xw.fx = xr;
2410                         if(bitm & YValue)
2411                                 xw.fy = yr;
2412                         if(bitm & WidthValue)
2413                                 xw.fw = (int)wr;
2414                         if(bitm & HeightValue)
2415                                 xw.fh = (int)hr;
2416                         if(bitm & XNegative && xw.fx == 0)
2417                                 xw.fx = -1;
2418                         if(bitm & XNegative && xw.fy == 0)
2419                                 xw.fy = -1;
2420
2421                         if(xw.fh != 0 && xw.fw != 0)
2422                                 xw.isfixed = True;
2423                         break;
2424                 case 'v':
2425                 default:
2426                         die(USAGE);
2427                 }
2428         }
2429
2430  run:
2431         setlocale(LC_CTYPE, "");
2432         tnew(80, 24);
2433         ttynew();
2434         xinit();
2435         selinit();
2436         run();
2437         return 0;
2438 }
2439