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 #include <X11/Xft/Xft.h>
  29 #define Glyph Glyph_
  30 #define Font Font_
  31
  32 #if   defined(__linux)
  33  #include <pty.h>
  34 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  35  #include <util.h>
  36 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  37  #include <libutil.h>
  38 #endif
  39
  40 #define USAGE \
  41         "st " VERSION " (c) 2010-2012 st engineers\n" \
  42         "usage: st [-t title] [-c class] [-g geometry]" \
  43         " [-w windowid] [-v] [-f file] [-e command...]\n"
  44
  45 /* XEMBED messages */
  46 #define XEMBED_FOCUS_IN  4
  47 #define XEMBED_FOCUS_OUT 5
  48
  49 /* Arbitrary sizes */
  50 #define ESC_BUF_SIZ   256
  51 #define ESC_ARG_SIZ   16
  52 #define STR_BUF_SIZ   256
  53 #define STR_ARG_SIZ   16
  54 #define DRAW_BUF_SIZ  20*1024
  55 #define UTF_SIZ       4
  56 #define XK_NO_MOD     UINT_MAX
  57 #define XK_ANY_MOD    0
  58
  59 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  60
  61 #define SERRNO strerror(errno)
  62 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  63 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  64 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  65 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  66 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  67 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  68 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  69 #define IS_SET(flag) (term.mode & (flag))
  70 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  71 #define X2COL(x) (((x) - BORDER)/xw.cw)
  72 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
  73
  74 enum glyph_attribute {
  75         ATTR_NULL      = 0,
  76         ATTR_REVERSE   = 1,
  77         ATTR_UNDERLINE = 2,
  78         ATTR_BOLD      = 4,
  79         ATTR_GFX       = 8,
  80         ATTR_ITALIC    = 16,
  81         ATTR_BLINK     = 32,
  82 };
  83
  84 enum cursor_movement {
  85         CURSOR_UP,
  86         CURSOR_DOWN,
  87         CURSOR_LEFT,
  88         CURSOR_RIGHT,
  89         CURSOR_SAVE,
  90         CURSOR_LOAD
  91 };
  92
  93 enum cursor_state {
  94         CURSOR_DEFAULT  = 0,
  95         CURSOR_HIDE     = 1,
  96         CURSOR_WRAPNEXT = 2
  97 };
  98
  99 enum glyph_state {
 100         GLYPH_SET   = 1,
 101         GLYPH_DIRTY = 2
 102 };
 103
 104 enum term_mode {
 105         MODE_WRAP       = 1,
 106         MODE_INSERT      = 2,
 107         MODE_APPKEYPAD   = 4,
 108         MODE_ALTSCREEN   = 8,
 109         MODE_CRLF       = 16,
 110         MODE_MOUSEBTN    = 32,
 111         MODE_MOUSEMOTION = 64,
 112         MODE_MOUSE       = 32|64,
 113         MODE_REVERSE     = 128,
 114         MODE_KBDLOCK     = 256
 115 };
 116
 117 enum escape_state {
 118         ESC_START      = 1,
 119         ESC_CSI = 2,
 120         ESC_STR = 4, /* DSC, OSC, PM, APC */
 121         ESC_ALTCHARSET = 8,
 122         ESC_STR_END    = 16, /* a final string was encountered */
 123 };
 124
 125 enum window_state {
 126         WIN_VISIBLE = 1,
 127         WIN_REDRAW  = 2,
 128         WIN_FOCUSED = 4
 129 };
 130
 131 /* bit macro */
 132 #undef B0
 133 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 134
 135 typedef unsigned char uchar;
 136 typedef unsigned int uint;
 137 typedef unsigned long ulong;
 138 typedef unsigned short ushort;
 139
 140 typedef struct {
 141         char c[UTF_SIZ];     /* character code */
 142         uchar mode;  /* attribute flags */
 143         ushort fg;   /* foreground  */
 144         ushort bg;   /* background  */
 145         uchar state; /* state flags    */
 146 } Glyph;
 147
 148 typedef Glyph* Line;
 149
 150 typedef struct {
 151         Glyph attr;      /* current char attributes */
 152         int x;
 153         int y;
 154         char state;
 155 } TCursor;
 156
 157 /* CSI Escape sequence structs */
 158 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 159 typedef struct {
 160         char buf[ESC_BUF_SIZ]; /* raw string */
 161         int len;               /* raw string length */
 162         char priv;
 163         int arg[ESC_ARG_SIZ];
 164         int narg;             /* nb of args */
 165         char mode;
 166 } CSIEscape;
 167
 168 /* STR Escape sequence structs */
 169 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 170 typedef struct {
 171         char type;           /* ESC type ... */
 172         char buf[STR_BUF_SIZ]; /* raw string */
 173         int len;               /* raw string length */
 174         char *args[STR_ARG_SIZ];
 175         int narg;             /* nb of args */
 176 } STREscape;
 177
 178 /* Internal representation of the screen */
 179 typedef struct {
 180         int row;        /* nb row */
 181         int col;        /* nb col */
 182         Line* line;     /* screen */
 183         Line* alt;      /* alternate screen */
 184         bool* dirty;    /* dirtyness of lines */
 185         TCursor c;      /* cursor */
 186         int top;        /* top    scroll limit */
 187         int bot;        /* bottom scroll limit */
 188         int mode;       /* terminal mode flags */
 189         int esc;        /* escape state flags */
 190         bool *tabs;
 191 } Term;
 192
 193 /* Purely graphic info */
 194 typedef struct {
 195         Display* dpy;
 196         Colormap cmap;
 197         Window win;
 198         XdbeBackBuffer buf;
 199         Atom xembed;
 200         XIM xim;
 201         XIC xic;
 202         XftDraw *xft_draw;
 203         Visual *vis;
 204         int scr;
 205         bool isfixed; /* is fixed geometry? */
 206         int fx, fy, fw, fh; /* fixed geometry */
 207         int tw, th; /* tty width and height */
 208         int w;  /* window width */
 209         int h;  /* window height */
 210         int ch; /* char height */
 211         int cw; /* char width  */
 212         char state; /* focus, redraw, visible */
 213 } XWindow;
 214
 215 typedef struct {
 216         KeySym k;
 217         uint mask;
 218         char s[ESC_BUF_SIZ];
 219 } Key;
 220
 221 /* TODO: use better name for vars... */
 222 typedef struct {
 223         int mode;
 224         int bx, by;
 225         int ex, ey;
 226         struct {int x, y;} b, e;
 227         char *clip;
 228         Atom xtarget;
 229         bool alt;
 230         struct timeval tclick1;
 231         struct timeval tclick2;
 232 } Selection;
 233
 234 #include "config.h"
 235
 236 /* Font structure */
 237 typedef struct {
 238         int ascent;
 239         int descent;
 240         short lbearing;
 241         short rbearing;
 242         XftFont* xft_set;
 243 } Font;
 244
 245 /* Drawing Context */
 246 typedef struct {
 247         XftColor xft_col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 248         GC gc;
 249         Font font, bfont, ifont, ibfont;
 250 } DC;
 251
 252 static void die(const char*, ...);
 253 static void draw(void);
 254 static void redraw(void);
 255 static void drawregion(int, int, int, int);
 256 static void execsh(void);
 257 static void sigchld(int);
 258 static void run(void);
 259
 260 static void csidump(void);
 261 static void csihandle(void);
 262 static void csiparse(void);
 263 static void csireset(void);
 264 static void strdump(void);
 265 static void strhandle(void);
 266 static void strparse(void);
 267 static void strreset(void);
 268
 269 static void tclearregion(int, int, int, int);
 270 static void tcursor(int);
 271 static void tdeletechar(int);
 272 static void tdeleteline(int);
 273 static void tinsertblank(int);
 274 static void tinsertblankline(int);
 275 static void tmoveto(int, int);
 276 static void tnew(int, int);
 277 static void tnewline(int);
 278 static void tputtab(bool);
 279 static void tputc(char*, int);
 280 static void treset(void);
 281 static int tresize(int, int);
 282 static void tscrollup(int, int);
 283 static void tscrolldown(int, int);
 284 static void tsetattr(int*, int);
 285 static void tsetchar(char*);
 286 static void tsetscroll(int, int);
 287 static void tswapscreen(void);
 288 static void tsetdirt(int, int);
 289 static void tsetmode(bool, bool, int *, int);
 290 static void tfulldirt(void);
 291
 292 static void ttynew(void);
 293 static void ttyread(void);
 294 static void ttyresize(void);
 295 static void ttywrite(const char *, size_t);
 296
 297 static void xdraws(char *, Glyph, int, int, int, int);
 298 static void xhints(void);
 299 static void xclear(int, int, int, int);
 300 static void xclearborders(void);
 301 static void xdrawcursor(void);
 302 static void xinit(void);
 303 static void xloadcols(void);
 304 static void xresettitle(void);
 305 static void xseturgency(int);
 306 static void xsetsel(char*);
 307 static void xtermclear(int, int, int, int);
 308 static void xresize(int, int);
 309
 310 static void expose(XEvent *);
 311 static void visibility(XEvent *);
 312 static void unmap(XEvent *);
 313 static char* kmap(KeySym, uint);
 314 static void kpress(XEvent *);
 315 static void cmessage(XEvent *);
 316 static void resize(XEvent *);
 317 static void focus(XEvent *);
 318 static void brelease(XEvent *);
 319 static void bpress(XEvent *);
 320 static void bmotion(XEvent *);
 321 static void selnotify(XEvent *);
 322 static void selclear(XEvent *);
 323 static void selrequest(XEvent *);
 324
 325 static void selinit(void);
 326 static inline bool selected(int, int);
 327 static void selcopy(void);
 328 static void selpaste(void);
 329 static void selscroll(int, int);
 330
 331 static int utf8decode(char *, long *);
 332 static int utf8encode(long *, char *);
 333 static int utf8size(char *);
 334 static int isfullutf8(char *, int);
 335
 336 static void *xmalloc(size_t);
 337 static void *xrealloc(void *, size_t);
 338 static void *xcalloc(size_t nmemb, size_t size);
 339 static char *smstrcat(char *, ...);
 340
 341 static void (*handler[LASTEvent])(XEvent *) = {
 342         [KeyPress] = kpress,
 343         [ClientMessage] = cmessage,
 344         [ConfigureNotify] = resize,
 345         [VisibilityNotify] = visibility,
 346         [UnmapNotify] = unmap,
 347         [Expose] = expose,
 348         [FocusIn] = focus,
 349         [FocusOut] = focus,
 350         [MotionNotify] = bmotion,
 351         [ButtonPress] = bpress,
 352         [ButtonRelease] = brelease,
 353         [SelectionClear] = selclear,
 354         [SelectionNotify] = selnotify,
 355         [SelectionRequest] = selrequest,
 356 };
 357
 358 /* Globals */
 359 static DC dc;
 360 static XWindow xw;
 361 static Term term;
 362 static CSIEscape csiescseq;
 363 static STREscape strescseq;
 364 static int cmdfd;
 365 static pid_t pid;
 366 static Selection sel;
 367 static int iofd = -1;
 368 static char **opt_cmd  = NULL;
 369 static char *opt_io    = NULL;
 370 static char *opt_title = NULL;
 371 static char *opt_embed = NULL;
 372 static char *opt_class = NULL;
 373
 374 void *
 375 xmalloc(size_t len) {
 376         void *p = malloc(len);
 377         if(!p)
 378                 die("Out of memory\n");
 379         return p;
 380 }
 381
 382 void *
 383 xrealloc(void *p, size_t len) {
 384         if((p = realloc(p, len)) == NULL)
 385                 die("Out of memory\n");
 386         return p;
 387 }
 388
 389 void *
 390 xcalloc(size_t nmemb, size_t size) {
 391         void *p = calloc(nmemb, size);
 392         if(!p)
 393                 die("Out of memory\n");
 394         return p;
 395 }
 396
 397 char *
 398 smstrcat(char *src, ...)
 399 {
 400         va_list fmtargs;
 401         char *ret, *p, *v;
 402         int len, slen, flen;
 403
 404         len = slen = strlen(src);
 405
 406         va_start(fmtargs, src);
 407         for(;;) {
 408                 v = va_arg(fmtargs, char *);
 409                 if(v == NULL)
 410                         break;
 411                 len += strlen(v);
 412         }
 413         va_end(fmtargs);
 414
 415         p = ret = xmalloc(len+1);
 416         memmove(p, src, slen);
 417         p += slen;
 418
 419         va_start(fmtargs, src);
 420         for(;;) {
 421                 v = va_arg(fmtargs, char *);
 422                 if(v == NULL)
 423                         break;
 424                 flen = strlen(v);
 425                 memmove(p, v, flen);
 426                 p += flen;
 427         }
 428         va_end(fmtargs);
 429
 430         ret[len] = '\0';
 431
 432         return ret;
 433 }
 434
 435 int
 436 utf8decode(char *s, long *u) {
 437         uchar c;
 438         int i, n, rtn;
 439
 440         rtn = 1;
 441         c = *s;
 442         if(~c & B7) { /* 0xxxxxxx */
 443                 *u = c;
 444                 return rtn;
 445         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 446                 *u = c&(B4|B3|B2|B1|B0);
 447                 n = 1;
 448         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 449                 *u = c&(B3|B2|B1|B0);
 450                 n = 2;
 451         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 452                 *u = c & (B2|B1|B0);
 453                 n = 3;
 454         } else
 455                 goto invalid;
 456         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 457                 c = *s;
 458                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 459                         goto invalid;
 460                 *u <<= 6;
 461                 *u |= c & (B5|B4|B3|B2|B1|B0);
 462         }
 463         if((n == 1 && *u < 0x80) ||
 464            (n == 2 && *u < 0x800) ||
 465            (n == 3 && *u < 0x10000) ||
 466            (*u >= 0xD800 && *u <= 0xDFFF))
 467                 goto invalid;
 468         return rtn;
 469 invalid:
 470         *u = 0xFFFD;
 471         return rtn;
 472 }
 473
 474 int
 475 utf8encode(long *u, char *s) {
 476         uchar *sp;
 477         ulong uc;
 478         int i, n;
 479
 480         sp = (uchar*) s;
 481         uc = *u;
 482         if(uc < 0x80) {
 483                 *sp = uc; /* 0xxxxxxx */
 484                 return 1;
 485         } else if(*u < 0x800) {
 486                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 487                 n = 1;
 488         } else if(uc < 0x10000) {
 489                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 490                 n = 2;
 491         } else if(uc <= 0x10FFFF) {
 492                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 493                 n = 3;
 494         } else {
 495                 goto invalid;
 496         }
 497         for(i=n,++sp; i>0; --i,++sp)
 498                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 499         return n+1;
 500 invalid:
 501         /* U+FFFD */
 502         *s++ = '\xEF';
 503         *s++ = '\xBF';
 504         *s = '\xBD';
 505         return 3;
 506 }
 507
 508 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 509    UTF-8 otherwise return 0 */
 510 int
 511 isfullutf8(char *s, int b) {
 512         uchar *c1, *c2, *c3;
 513
 514         c1 = (uchar *) s;
 515         c2 = (uchar *) ++s;
 516         c3 = (uchar *) ++s;
 517         if(b < 1)
 518                 return 0;
 519         else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
 520                 return 0;
 521         else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 522             ((b == 1) ||
 523             ((b == 2) && (*c2&(B7|B6)) == B7)))
 524                 return 0;
 525         else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 526             ((b == 1) ||
 527             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 528             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
 529                 return 0;
 530         else
 531                 return 1;
 532 }
 533
 534 int
 535 utf8size(char *s) {
 536         uchar c = *s;
 537
 538         if(~c&B7)
 539                 return 1;
 540         else if((c&(B7|B6|B5)) == (B7|B6))
 541                 return 2;
 542         else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
 543                 return 3;
 544         else
 545                 return 4;
 546 }
 547
 548 void
 549 selinit(void) {
 550         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 551         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 552         sel.mode = 0;
 553         sel.bx = -1;
 554         sel.clip = NULL;
 555         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 556         if(sel.xtarget == None)
 557                 sel.xtarget = XA_STRING;
 558 }
 559
 560 static inline bool
 561 selected(int x, int y) {
 562         if(sel.ey == y && sel.by == y) {
 563                 int bx = MIN(sel.bx, sel.ex);
 564                 int ex = MAX(sel.bx, sel.ex);
 565                 return BETWEEN(x, bx, ex);
 566         }
 567         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 568                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 569 }
 570
 571 void
 572 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 573         if(b)
 574                 *b = e->xbutton.button;
 575
 576         *x = X2COL(e->xbutton.x);
 577         *y = Y2ROW(e->xbutton.y);
 578         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 579         sel.b.y = MIN(sel.by, sel.ey);
 580         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 581         sel.e.y = MAX(sel.by, sel.ey);
 582 }
 583
 584 void
 585 mousereport(XEvent *e) {
 586         int x = X2COL(e->xbutton.x);
 587         int y = Y2ROW(e->xbutton.y);
 588         int button = e->xbutton.button;
 589         int state = e->xbutton.state;
 590         char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
 591         static int ob, ox, oy;
 592
 593         /* from urxvt */
 594         if(e->xbutton.type == MotionNotify) {
 595                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 596                         return;
 597                 button = ob + 32;
 598                 ox = x, oy = y;
 599         } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
 600                 button = 3;
 601         } else {
 602                 button -= Button1;
 603                 if(button >= 3)
 604                         button += 64 - 3;
 605                 if(e->xbutton.type == ButtonPress) {
 606                         ob = button;
 607                         ox = x, oy = y;
 608                 }
 609         }
 610
 611         buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
 612                 + (state & Mod4Mask    ? 8  : 0)
 613                 + (state & ControlMask ? 16 : 0);
 614
 615         ttywrite(buf, sizeof(buf));
 616 }
 617
 618 void
 619 bpress(XEvent *e) {
 620         if(IS_SET(MODE_MOUSE))
 621                 mousereport(e);
 622         else if(e->xbutton.button == Button1) {
 623                 if(sel.bx != -1) {
 624                         sel.bx = -1;
 625                         tsetdirt(sel.b.y, sel.e.y);
 626                         draw();
 627                 }
 628                 sel.mode = 1;
 629                 sel.ex = sel.bx = X2COL(e->xbutton.x);
 630                 sel.ey = sel.by = Y2ROW(e->xbutton.y);
 631         }
 632 }
 633
 634 void
 635 selcopy(void) {
 636         char *str, *ptr;
 637         int x, y, bufsize, is_selected = 0;
 638
 639         if(sel.bx == -1)
 640                 str = NULL;
 641
 642         else {
 643                 bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 644                 ptr = str = xmalloc(bufsize);
 645
 646                 /* append every set & selected glyph to the selection */
 647                 for(y = 0; y < term.row; y++) {
 648                         for(x = 0; x < term.col; x++) {
 649                                 int size;
 650                                 char *p;
 651                                 Glyph *gp = &term.line[y][x];
 652
 653                                 if(!(is_selected = selected(x, y)))
 654                                         continue;
 655                                 p = (gp->state & GLYPH_SET) ? gp->c : " ";
 656                                 size = utf8size(p);
 657                                 memcpy(ptr, p, size);
 658                                 ptr += size;
 659                         }
 660                         /* \n at the end of every selected line except for the last one */
 661                         if(is_selected && y < sel.e.y)
 662                                 *ptr++ = '\n';
 663                 }
 664                 *ptr = 0;
 665         }
 666         sel.alt = IS_SET(MODE_ALTSCREEN);
 667         xsetsel(str);
 668 }
 669
 670 void
 671 selnotify(XEvent *e) {
 672         ulong nitems, ofs, rem;
 673         int format;
 674         uchar *data;
 675         Atom type;
 676
 677         ofs = 0;
 678         do {
 679                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 680                                         False, AnyPropertyType, &type, &format,
 681                                         &nitems, &rem, &data)) {
 682                         fprintf(stderr, "Clipboard allocation failed\n");
 683                         return;
 684                 }
 685                 ttywrite((const char *) data, nitems * format / 8);
 686                 XFree(data);
 687                 /* number of 32-bit chunks returned */
 688                 ofs += nitems * format / 32;
 689         } while(rem > 0);
 690 }
 691
 692 void
 693 selpaste() {
 694         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
 695 }
 696
 697 void selclear(XEvent *e) {
 698         if(sel.bx == -1)
 699                 return;
 700         sel.bx = -1;
 701         tsetdirt(sel.b.y, sel.e.y);
 702 }
 703
 704 void
 705 selrequest(XEvent *e) {
 706         XSelectionRequestEvent *xsre;
 707         XSelectionEvent xev;
 708         Atom xa_targets;
 709
 710         xsre = (XSelectionRequestEvent *) e;
 711         xev.type = SelectionNotify;
 712         xev.requestor = xsre->requestor;
 713         xev.selection = xsre->selection;
 714         xev.target = xsre->target;
 715         xev.time = xsre->time;
 716         /* reject */
 717         xev.property = None;
 718
 719         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 720         if(xsre->target == xa_targets) {
 721                 /* respond with the supported type */
 722                 Atom string = sel.xtarget;
 723                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 724                                 XA_ATOM, 32, PropModeReplace,
 725                                 (uchar *) &string, 1);
 726                 xev.property = xsre->property;
 727         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 728                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 729                                 xsre->target, 8, PropModeReplace,
 730                                 (uchar *) sel.clip, strlen(sel.clip));
 731                 xev.property = xsre->property;
 732         }
 733
 734         /* all done, send a notification to the listener */
 735         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 736                 fprintf(stderr, "Error sending SelectionNotify event\n");
 737 }
 738
 739 void
 740 xsetsel(char *str) {
 741         /* register the selection for both the clipboard and the primary */
 742         Atom clipboard;
 743
 744         free(sel.clip);
 745         sel.clip = str;
 746
 747         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 748
 749         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 750         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 751 }
 752
 753 void
 754 brelease(XEvent *e) {
 755         if(IS_SET(MODE_MOUSE)) {
 756                 mousereport(e);
 757                 return;
 758         }
 759         if(e->xbutton.button == Button2)
 760                 selpaste();
 761         else if(e->xbutton.button == Button1) {
 762                 sel.mode = 0;
 763                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 764                 term.dirty[sel.ey] = 1;
 765                 if(sel.bx == sel.ex && sel.by == sel.ey) {
 766                         struct timeval now;
 767                         sel.bx = -1;
 768                         gettimeofday(&now, NULL);
 769
 770                         if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
 771                                 /* triple click on the line */
 772                                 sel.b.x = sel.bx = 0;
 773                                 sel.e.x = sel.ex = term.col;
 774                                 sel.b.y = sel.e.y = sel.ey;
 775                                 selcopy();
 776                         } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
 777                                 /* double click to select word */
 778                                 sel.bx = sel.ex;
 779                                 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
 780                                           term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
 781                                 sel.b.x = sel.bx;
 782                                 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
 783                                           term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
 784                                 sel.e.x = sel.ex;
 785                                 sel.b.y = sel.e.y = sel.ey;
 786                                 selcopy();
 787                         }
 788                 } else
 789                         selcopy();
 790         }
 791         memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
 792         gettimeofday(&sel.tclick1, NULL);
 793 }
 794
 795 void
 796 bmotion(XEvent *e) {
 797         if(IS_SET(MODE_MOUSE)) {
 798                 mousereport(e);
 799                 return;
 800         }
 801         if(sel.mode) {
 802                 int oldey = sel.ey, oldex = sel.ex;
 803                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 804
 805                 if(oldey != sel.ey || oldex != sel.ex) {
 806                         int starty = MIN(oldey, sel.ey);
 807                         int endy = MAX(oldey, sel.ey);
 808                         tsetdirt(starty, endy);
 809                 }
 810         }
 811 }
 812
 813 void
 814 die(const char *errstr, ...) {
 815         va_list ap;
 816
 817         va_start(ap, errstr);
 818         vfprintf(stderr, errstr, ap);
 819         va_end(ap);
 820         exit(EXIT_FAILURE);
 821 }
 822
 823 void
 824 execsh(void) {
 825         char **args;
 826         char *envshell = getenv("SHELL");
 827
 828         unsetenv("COLUMNS");
 829         unsetenv("LINES");
 830         unsetenv("TERMCAP");
 831
 832         signal(SIGCHLD, SIG_DFL);
 833         signal(SIGHUP, SIG_DFL);
 834         signal(SIGINT, SIG_DFL);
 835         signal(SIGQUIT, SIG_DFL);
 836         signal(SIGTERM, SIG_DFL);
 837         signal(SIGALRM, SIG_DFL);
 838
 839         DEFAULT(envshell, SHELL);
 840         putenv("TERM="TNAME);
 841         args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
 842         execvp(args[0], args);
 843         exit(EXIT_FAILURE);
 844 }
 845
 846 void
 847 sigchld(int a) {
 848         int stat = 0;
 849         if(waitpid(pid, &stat, 0) < 0)
 850                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 851         if(WIFEXITED(stat))
 852                 exit(WEXITSTATUS(stat));
 853         else
 854                 exit(EXIT_FAILURE);
 855 }
 856
 857 void
 858 ttynew(void) {
 859         int m, s;
 860
 861         /* seems to work fine on linux, openbsd and freebsd */
 862         struct winsize w = {term.row, term.col, 0, 0};
 863         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 864                 die("openpty failed: %s\n", SERRNO);
 865
 866         switch(pid = fork()) {
 867         case -1:
 868                 die("fork failed\n");
 869                 break;
 870         case 0:
 871                 setsid(); /* create a new process group */
 872                 dup2(s, STDIN_FILENO);
 873                 dup2(s, STDOUT_FILENO);
 874                 dup2(s, STDERR_FILENO);
 875                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 876                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 877                 close(s);
 878                 close(m);
 879                 execsh();
 880                 break;
 881         default:
 882                 close(s);
 883                 cmdfd = m;
 884                 signal(SIGCHLD, sigchld);
 885                 if(opt_io) {
 886                         if(!strcmp(opt_io, "-")) {
 887                                 iofd = STDOUT_FILENO;
 888                         } else {
 889                                 if((iofd = open(opt_io, O_WRONLY | O_CREAT, 0666)) < 0) {
 890                                         fprintf(stderr, "Error opening %s:%s\n",
 891                                                 opt_io, strerror(errno));
 892                                 }
 893                         }
 894                 }
 895         }
 896 }
 897
 898 void
 899 dump(char c) {
 900         static int col;
 901         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 902         if(++col % 10 == 0)
 903                 fprintf(stderr, "\n");
 904 }
 905
 906 void
 907 ttyread(void) {
 908         static char buf[BUFSIZ];
 909         static int buflen = 0;
 910         char *ptr;
 911         char s[UTF_SIZ];
 912         int charsize; /* size of utf8 char in bytes */
 913         long utf8c;
 914         int ret;
 915
 916         /* append read bytes to unprocessed bytes */
 917         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
 918                 die("Couldn't read from shell: %s\n", SERRNO);
 919
 920         /* process every complete utf8 char */
 921         buflen += ret;
 922         ptr = buf;
 923         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
 924                 charsize = utf8decode(ptr, &utf8c);
 925                 utf8encode(&utf8c, s);
 926                 tputc(s, charsize);
 927                 ptr    += charsize;
 928                 buflen -= charsize;
 929         }
 930
 931         /* keep any uncomplete utf8 char for the next call */
 932         memmove(buf, ptr, buflen);
 933 }
 934
 935 void
 936 ttywrite(const char *s, size_t n) {
 937         if(write(cmdfd, s, n) == -1)
 938                 die("write error on tty: %s\n", SERRNO);
 939 }
 940
 941 void
 942 ttyresize(void) {
 943         struct winsize w;
 944
 945         w.ws_row = term.row;
 946         w.ws_col = term.col;
 947         w.ws_xpixel = xw.tw;
 948         w.ws_ypixel = xw.th;
 949         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 950                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 951 }
 952
 953 void
 954 tsetdirt(int top, int bot)
 955 {
 956         int i;
 957
 958         LIMIT(top, 0, term.row-1);
 959         LIMIT(bot, 0, term.row-1);
 960
 961         for(i = top; i <= bot; i++)
 962                 term.dirty[i] = 1;
 963 }
 964
 965 void
 966 tfulldirt(void)
 967 {
 968         tsetdirt(0, term.row-1);
 969 }
 970
 971 void
 972 tcursor(int mode) {
 973         static TCursor c;
 974
 975         if(mode == CURSOR_SAVE)
 976                 c = term.c;
 977         else if(mode == CURSOR_LOAD)
 978                 term.c = c, tmoveto(c.x, c.y);
 979 }
 980
 981 void
 982 treset(void) {
 983         uint i;
 984         term.c = (TCursor){{
 985                 .mode = ATTR_NULL,
 986                 .fg = DefaultFG,
 987                 .bg = DefaultBG
 988         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 989
 990         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 991         for(i = TAB; i < term.col; i += TAB)
 992                 term.tabs[i] = 1;
 993         term.top = 0, term.bot = term.row - 1;
 994         term.mode = MODE_WRAP;
 995
 996         tclearregion(0, 0, term.col-1, term.row-1);
 997 }
 998
 999 void
1000 tnew(int col, int row) {
1001         /* set screen size */
1002         term.row = row, term.col = col;
1003         term.line = xmalloc(term.row * sizeof(Line));
1004         term.alt  = xmalloc(term.row * sizeof(Line));
1005         term.dirty = xmalloc(term.row * sizeof(*term.dirty));
1006         term.tabs = xmalloc(term.col * sizeof(*term.tabs));
1007
1008         for(row = 0; row < term.row; row++) {
1009                 term.line[row] = xmalloc(term.col * sizeof(Glyph));
1010                 term.alt [row] = xmalloc(term.col * sizeof(Glyph));
1011                 term.dirty[row] = 0;
1012         }
1013         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1014         /* setup screen */
1015         treset();
1016 }
1017
1018 void
1019 tswapscreen(void) {
1020         Line* tmp = term.line;
1021         term.line = term.alt;
1022         term.alt = tmp;
1023         term.mode ^= MODE_ALTSCREEN;
1024         tfulldirt();
1025 }
1026
1027 void
1028 tscrolldown(int orig, int n) {
1029         int i;
1030         Line temp;
1031
1032         LIMIT(n, 0, term.bot-orig+1);
1033
1034         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1035
1036         for(i = term.bot; i >= orig+n; i--) {
1037                 temp = term.line[i];
1038                 term.line[i] = term.line[i-n];
1039                 term.line[i-n] = temp;
1040
1041                 term.dirty[i] = 1;
1042                 term.dirty[i-n] = 1;
1043         }
1044
1045         selscroll(orig, n);
1046 }
1047
1048 void
1049 tscrollup(int orig, int n) {
1050         int i;
1051         Line temp;
1052         LIMIT(n, 0, term.bot-orig+1);
1053
1054         tclearregion(0, orig, term.col-1, orig+n-1);
1055
1056         for(i = orig; i <= term.bot-n; i++) {
1057                  temp = term.line[i];
1058                  term.line[i] = term.line[i+n];
1059                  term.line[i+n] = temp;
1060
1061                  term.dirty[i] = 1;
1062                  term.dirty[i+n] = 1;
1063         }
1064
1065         selscroll(orig, -n);
1066 }
1067
1068 void
1069 selscroll(int orig, int n) {
1070         if(sel.bx == -1)
1071                 return;
1072
1073         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
1074                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
1075                         sel.bx = -1;
1076                         return;
1077                 }
1078                 if(sel.by < term.top) {
1079                         sel.by = term.top;
1080                         sel.bx = 0;
1081                 }
1082                 if(sel.ey > term.bot) {
1083                         sel.ey = term.bot;
1084                         sel.ex = term.col;
1085                 }
1086                 sel.b.y = sel.by, sel.b.x = sel.bx;
1087                 sel.e.y = sel.ey, sel.e.x = sel.ex;
1088         }
1089 }
1090
1091 void
1092 tnewline(int first_col) {
1093         int y = term.c.y;
1094         if(y == term.bot)
1095                 tscrollup(term.top, 1);
1096         else
1097                 y++;
1098         tmoveto(first_col ? 0 : term.c.x, y);
1099 }
1100
1101 void
1102 csiparse(void) {
1103         /* int noarg = 1; */
1104         char *p = csiescseq.buf;
1105
1106         csiescseq.narg = 0;
1107         if(*p == '?')
1108                 csiescseq.priv = 1, p++;
1109
1110         while(p < csiescseq.buf+csiescseq.len) {
1111                 while(isdigit(*p)) {
1112                         csiescseq.arg[csiescseq.narg] *= 10;
1113                         csiescseq.arg[csiescseq.narg] += *p++ - '0'/*, noarg = 0 */;
1114                 }
1115                 if(*p == ';' && csiescseq.narg+1 < ESC_ARG_SIZ)
1116                         csiescseq.narg++, p++;
1117                 else {
1118                         csiescseq.mode = *p;
1119                         csiescseq.narg++;
1120                         return;
1121                 }
1122         }
1123 }
1124
1125 void
1126 tmoveto(int x, int y) {
1127         LIMIT(x, 0, term.col-1);
1128         LIMIT(y, 0, term.row-1);
1129         term.c.state &= ~CURSOR_WRAPNEXT;
1130         term.c.x = x;
1131         term.c.y = y;
1132 }
1133
1134 void
1135 tsetchar(char *c) {
1136         /*
1137          * The table is proudly stolen from rxvt.
1138          */
1139         if(term.c.attr.mode & ATTR_GFX) {
1140                 char *vt100_0[62] = { /* 0x41 - 0x7e */
1141                         "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1142                         0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1143                         0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1144                         0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1145                         "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1146                         "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1147                         "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1148                         "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1149                 };
1150
1151                 if(c[0] >= 0x41 && c[0] <= 0x7e
1152                                 && vt100_0[c[0] - 0x41]) {
1153                         c = vt100_0[c[0] - 0x41];
1154                 }
1155         }
1156
1157         term.dirty[term.c.y] = 1;
1158         term.line[term.c.y][term.c.x] = term.c.attr;
1159         memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
1160         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
1161 }
1162
1163 void
1164 tclearregion(int x1, int y1, int x2, int y2) {
1165         int x, y, temp;
1166
1167         if(x1 > x2)
1168                 temp = x1, x1 = x2, x2 = temp;
1169         if(y1 > y2)
1170                 temp = y1, y1 = y2, y2 = temp;
1171
1172         LIMIT(x1, 0, term.col-1);
1173         LIMIT(x2, 0, term.col-1);
1174         LIMIT(y1, 0, term.row-1);
1175         LIMIT(y2, 0, term.row-1);
1176
1177         for(y = y1; y <= y2; y++) {
1178                 term.dirty[y] = 1;
1179                 for(x = x1; x <= x2; x++)
1180                         term.line[y][x].state = 0;
1181         }
1182 }
1183
1184 void
1185 tdeletechar(int n) {
1186         int src = term.c.x + n;
1187         int dst = term.c.x;
1188         int size = term.col - src;
1189
1190         term.dirty[term.c.y] = 1;
1191
1192         if(src >= term.col) {
1193                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1194                 return;
1195         }
1196         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1197         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1198 }
1199
1200 void
1201 tinsertblank(int n) {
1202         int src = term.c.x;
1203         int dst = src + n;
1204         int size = term.col - dst;
1205
1206         term.dirty[term.c.y] = 1;
1207
1208         if(dst >= term.col) {
1209                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1210                 return;
1211         }
1212         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1213         tclearregion(src, term.c.y, dst - 1, term.c.y);
1214 }
1215
1216 void
1217 tinsertblankline(int n) {
1218         if(term.c.y < term.top || term.c.y > term.bot)
1219                 return;
1220
1221         tscrolldown(term.c.y, n);
1222 }
1223
1224 void
1225 tdeleteline(int n) {
1226         if(term.c.y < term.top || term.c.y > term.bot)
1227                 return;
1228
1229         tscrollup(term.c.y, n);
1230 }
1231
1232 void
1233 tsetattr(int *attr, int l) {
1234         int i;
1235
1236         for(i = 0; i < l; i++) {
1237                 switch(attr[i]) {
1238                 case 0:
1239                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD \
1240                                         | ATTR_ITALIC | ATTR_BLINK);
1241                         term.c.attr.fg = DefaultFG;
1242                         term.c.attr.bg = DefaultBG;
1243                         break;
1244                 case 1:
1245                         term.c.attr.mode |= ATTR_BOLD;
1246                         break;
1247                 case 3: /* enter standout (highlight) */
1248                         term.c.attr.mode |= ATTR_ITALIC;
1249                         break;
1250                 case 4:
1251                         term.c.attr.mode |= ATTR_UNDERLINE;
1252                         break;
1253                 case 5:
1254                         term.c.attr.mode |= ATTR_BLINK;
1255                         break;
1256                 case 7:
1257                         term.c.attr.mode |= ATTR_REVERSE;
1258                         break;
1259                 case 21:
1260                 case 22:
1261                         term.c.attr.mode &= ~ATTR_BOLD;
1262                         break;
1263                 case 23: /* leave standout (highlight) mode */
1264                         term.c.attr.mode &= ~ATTR_ITALIC;
1265                         break;
1266                 case 24:
1267                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1268                         break;
1269                 case 25:
1270                         term.c.attr.mode &= ~ATTR_BLINK;
1271                         break;
1272                 case 27:
1273                         term.c.attr.mode &= ~ATTR_REVERSE;
1274                         break;
1275                 case 38:
1276                         if(i + 2 < l && attr[i + 1] == 5) {
1277                                 i += 2;
1278                                 if(BETWEEN(attr[i], 0, 255))
1279                                         term.c.attr.fg = attr[i];
1280                                 else
1281                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
1282                         }
1283                         else
1284                                 fprintf(stderr, "erresc(38): gfx attr %d unknown\n", attr[i]);
1285                         break;
1286                 case 39:
1287                         term.c.attr.fg = DefaultFG;
1288                         break;
1289                 case 48:
1290                         if(i + 2 < l && attr[i + 1] == 5) {
1291                                 i += 2;
1292                                 if(BETWEEN(attr[i], 0, 255))
1293                                         term.c.attr.bg = attr[i];
1294                                 else
1295                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
1296                         }
1297                         else
1298                                 fprintf(stderr, "erresc(48): gfx attr %d unknown\n", attr[i]);
1299                         break;
1300                 case 49:
1301                         term.c.attr.bg = DefaultBG;
1302                         break;
1303                 default:
1304                         if(BETWEEN(attr[i], 30, 37))
1305                                 term.c.attr.fg = attr[i] - 30;
1306                         else if(BETWEEN(attr[i], 40, 47))
1307                                 term.c.attr.bg = attr[i] - 40;
1308                         else if(BETWEEN(attr[i], 90, 97))
1309                                 term.c.attr.fg = attr[i] - 90 + 8;
1310                         else if(BETWEEN(attr[i], 100, 107))
1311                                 term.c.attr.bg = attr[i] - 100 + 8;
1312                         else
1313                                 fprintf(stderr, "erresc(default): gfx attr %d unknown\n", attr[i]), csidump();
1314                         break;
1315                 }
1316         }
1317 }
1318
1319 void
1320 tsetscroll(int t, int b) {
1321         int temp;
1322
1323         LIMIT(t, 0, term.row-1);
1324         LIMIT(b, 0, term.row-1);
1325         if(t > b) {
1326                 temp = t;
1327                 t = b;
1328                 b = temp;
1329         }
1330         term.top = t;
1331         term.bot = b;
1332 }
1333
1334 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1335
1336 void
1337 tsetmode(bool priv, bool set, int *args, int narg) {
1338         int *lim, mode;
1339
1340         for(lim = args + narg; args < lim; ++args) {
1341                 if(priv) {
1342                         switch(*args) {
1343                                 break;
1344                         case 1: /* DECCKM -- Cursor key */
1345                                 MODBIT(term.mode, set, MODE_APPKEYPAD);
1346                                 break;
1347                         case 5: /* DECSCNM -- Reverve video */
1348                                 mode = term.mode;
1349                                 MODBIT(term.mode, set, MODE_REVERSE);
1350                                 if(mode != term.mode)
1351                                         redraw();
1352                                 break;
1353                         case 6: /* XXX: DECOM -- Origin */
1354                                 break;
1355                         case 7: /* DECAWM -- Auto wrap */
1356                                 MODBIT(term.mode, set, MODE_WRAP);
1357                                 break;
1358                         case 8: /* XXX: DECARM -- Auto repeat */
1359                                 break;
1360                         case 0:  /* Error (IGNORED) */
1361                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1362                                 break;
1363                         case 25:
1364                                 MODBIT(term.c.state, !set, CURSOR_HIDE);
1365                                 break;
1366                         case 1000: /* 1000,1002: enable xterm mouse report */
1367                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1368                                 break;
1369                         case 1002:
1370                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1371                                 break;
1372                         case 1049: /* = 1047 and 1048 */
1373                         case 47:
1374                         case 1047:
1375                                 if(IS_SET(MODE_ALTSCREEN))
1376                                         tclearregion(0, 0, term.col-1, term.row-1);
1377                                 if((set && !IS_SET(MODE_ALTSCREEN)) ||
1378                                     (!set && IS_SET(MODE_ALTSCREEN))) {
1379                                             tswapscreen();
1380                                 }
1381                                 if(*args != 1049)
1382                                         break;
1383                                 /* pass through */
1384                         case 1048:
1385                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1386                                 break;
1387                         default:
1388                         /* case 2:  DECANM -- ANSI/VT52 (NOT SUPPOURTED) */
1389                         /* case 3:  DECCOLM -- Column  (NOT SUPPORTED) */
1390                         /* case 4:  DECSCLM -- Scroll (NOT SUPPORTED) */
1391                         /* case 18: DECPFF -- Printer feed (NOT SUPPORTED) */
1392                         /* case 19: DECPEX -- Printer extent (NOT SUPPORTED) */
1393                         /* case 42: DECNRCM -- National characters (NOT SUPPORTED) */
1394                                 fprintf(stderr,
1395                                         "erresc: unknown private set/reset mode %d\n",
1396                                         *args);
1397                                 break;
1398                         }
1399                 } else {
1400                         switch(*args) {
1401                         case 0:  /* Error (IGNORED) */
1402                                 break;
1403                         case 2:  /* KAM -- keyboard action */
1404                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1405                                 break;
1406                         case 4:  /* IRM -- Insertion-replacement */
1407                                 MODBIT(term.mode, set, MODE_INSERT);
1408                                 break;
1409                         case 12: /* XXX: SRM -- Send/Receive */
1410                                 break;
1411                         case 20: /* LNM -- Linefeed/new line */
1412                                 MODBIT(term.mode, set, MODE_CRLF);
1413                                 break;
1414                         default:
1415                                 fprintf(stderr,
1416                                         "erresc: unknown set/reset mode %d\n",
1417                                         *args);
1418                                 break;
1419                         }
1420                 }
1421         }
1422 }
1423 #undef MODBIT
1424
1425
1426 void
1427 csihandle(void) {
1428         switch(csiescseq.mode) {
1429         default:
1430         unknown:
1431                 fprintf(stderr, "erresc: unknown csi ");
1432                 csidump();
1433                 /* die(""); */
1434                 break;
1435         case '@': /* ICH -- Insert <n> blank char */
1436                 DEFAULT(csiescseq.arg[0], 1);
1437                 tinsertblank(csiescseq.arg[0]);
1438                 break;
1439         case 'A': /* CUU -- Cursor <n> Up */
1440         case 'e':
1441                 DEFAULT(csiescseq.arg[0], 1);
1442                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1443                 break;
1444         case 'B': /* CUD -- Cursor <n> Down */
1445                 DEFAULT(csiescseq.arg[0], 1);
1446                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1447                 break;
1448         case 'C': /* CUF -- Cursor <n> Forward */
1449         case 'a':
1450                 DEFAULT(csiescseq.arg[0], 1);
1451                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1452                 break;
1453         case 'D': /* CUB -- Cursor <n> Backward */
1454                 DEFAULT(csiescseq.arg[0], 1);
1455                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1456                 break;
1457         case 'E': /* CNL -- Cursor <n> Down and first col */
1458                 DEFAULT(csiescseq.arg[0], 1);
1459                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1460                 break;
1461         case 'F': /* CPL -- Cursor <n> Up and first col */
1462                 DEFAULT(csiescseq.arg[0], 1);
1463                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1464                 break;
1465         case 'g': /* TBC -- Tabulation clear */
1466                 switch (csiescseq.arg[0]) {
1467                 case 0: /* clear current tab stop */
1468                         term.tabs[term.c.x] = 0;
1469                         break;
1470                 case 3: /* clear all the tabs */
1471                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1472                         break;
1473                 default:
1474                         goto unknown;
1475                 }
1476                 break;
1477         case 'G': /* CHA -- Move to <col> */
1478         case '`': /* HPA */
1479                 DEFAULT(csiescseq.arg[0], 1);
1480                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1481                 break;
1482         case 'H': /* CUP -- Move to <row> <col> */
1483         case 'f': /* HVP */
1484                 DEFAULT(csiescseq.arg[0], 1);
1485                 DEFAULT(csiescseq.arg[1], 1);
1486                 tmoveto(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1487                 break;
1488         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1489                 DEFAULT(csiescseq.arg[0], 1);
1490                 while(csiescseq.arg[0]--)
1491                         tputtab(1);
1492                 break;
1493         case 'J': /* ED -- Clear screen */
1494                 sel.bx = -1;
1495                 switch(csiescseq.arg[0]) {
1496                 case 0: /* below */
1497                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1498                         if(term.c.y < term.row-1)
1499                                 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1500                         break;
1501                 case 1: /* above */
1502                         if(term.c.y > 1)
1503                                 tclearregion(0, 0, term.col-1, term.c.y-1);
1504                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1505                         break;
1506                 case 2: /* all */
1507                         tclearregion(0, 0, term.col-1, term.row-1);
1508                         break;
1509                 default:
1510                         goto unknown;
1511                 }
1512                 break;
1513         case 'K': /* EL -- Clear line */
1514                 switch(csiescseq.arg[0]) {
1515                 case 0: /* right */
1516                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1517                         break;
1518                 case 1: /* left */
1519                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1520                         break;
1521                 case 2: /* all */
1522                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1523                         break;
1524                 }
1525                 break;
1526         case 'S': /* SU -- Scroll <n> line up */
1527                 DEFAULT(csiescseq.arg[0], 1);
1528                 tscrollup(term.top, csiescseq.arg[0]);
1529                 break;
1530         case 'T': /* SD -- Scroll <n> line down */
1531                 DEFAULT(csiescseq.arg[0], 1);
1532                 tscrolldown(term.top, csiescseq.arg[0]);
1533                 break;
1534         case 'L': /* IL -- Insert <n> blank lines */
1535                 DEFAULT(csiescseq.arg[0], 1);
1536                 tinsertblankline(csiescseq.arg[0]);
1537                 break;
1538         case 'l': /* RM -- Reset Mode */
1539                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1540                 break;
1541         case 'M': /* DL -- Delete <n> lines */
1542                 DEFAULT(csiescseq.arg[0], 1);
1543                 tdeleteline(csiescseq.arg[0]);
1544                 break;
1545         case 'X': /* ECH -- Erase <n> char */
1546                 DEFAULT(csiescseq.arg[0], 1);
1547                 tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0], term.c.y);
1548                 break;
1549         case 'P': /* DCH -- Delete <n> char */
1550                 DEFAULT(csiescseq.arg[0], 1);
1551                 tdeletechar(csiescseq.arg[0]);
1552                 break;
1553         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1554                 DEFAULT(csiescseq.arg[0], 1);
1555                 while(csiescseq.arg[0]--)
1556                         tputtab(0);
1557                 break;
1558         case 'd': /* VPA -- Move to <row> */
1559                 DEFAULT(csiescseq.arg[0], 1);
1560                 tmoveto(term.c.x, csiescseq.arg[0]-1);
1561                 break;
1562         case 'h': /* SM -- Set terminal mode */
1563                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1564                 break;
1565         case 'm': /* SGR -- Terminal attribute (color) */
1566                 tsetattr(csiescseq.arg, csiescseq.narg);
1567                 break;
1568         case 'r': /* DECSTBM -- Set Scrolling Region */
1569                 if(csiescseq.priv)
1570                         goto unknown;
1571                 else {
1572                         DEFAULT(csiescseq.arg[0], 1);
1573                         DEFAULT(csiescseq.arg[1], term.row);
1574                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1575                         tmoveto(0, 0);
1576                 }
1577                 break;
1578         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1579                 tcursor(CURSOR_SAVE);
1580                 break;
1581         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1582                 tcursor(CURSOR_LOAD);
1583                 break;
1584         }
1585 }
1586
1587 void
1588 csidump(void) {
1589         int i;
1590         printf("ESC[");
1591         for(i = 0; i < csiescseq.len; i++) {
1592                 uint c = csiescseq.buf[i] & 0xff;
1593                 if(isprint(c)) putchar(c);
1594                 else if(c == '\n') printf("(\\n)");
1595                 else if(c == '\r') printf("(\\r)");
1596                 else if(c == 0x1b) printf("(\\e)");
1597                 else printf("(%02x)", c);
1598         }
1599         putchar('\n');
1600 }
1601
1602 void
1603 csireset(void) {
1604         memset(&csiescseq, 0, sizeof(csiescseq));
1605 }
1606
1607 void
1608 strhandle(void) {
1609         char *p;
1610
1611         /*
1612          * TODO: make this being useful in case of color palette change.
1613          */
1614         strparse();
1615
1616         p = strescseq.buf;
1617
1618         switch(strescseq.type) {
1619         case ']': /* OSC -- Operating System Command */
1620                 switch(p[0]) {
1621                 case '0':
1622                 case '1':
1623                 case '2':
1624                         /*
1625                          * TODO: Handle special chars in string, like umlauts.
1626                          */
1627                         if(p[1] == ';') {
1628                                 XStoreName(xw.dpy, xw.win, strescseq.buf+2);
1629                         }
1630                         break;
1631                 case ';':
1632                         XStoreName(xw.dpy, xw.win, strescseq.buf+1);
1633                         break;
1634                 case '4': /* TODO: Set color (arg0) to "rgb:%hexr/$hexg/$hexb" (arg1) */
1635                         break;
1636                 default:
1637                         fprintf(stderr, "erresc: unknown str ");
1638                         strdump();
1639                         break;
1640                 }
1641                 break;
1642         case 'k': /* old title set compatibility */
1643                 XStoreName(xw.dpy, xw.win, strescseq.buf);
1644                 break;
1645         case 'P': /* DSC -- Device Control String */
1646         case '_': /* APC -- Application Program Command */
1647         case '^': /* PM -- Privacy Message */
1648         default:
1649                 fprintf(stderr, "erresc: unknown str ");
1650                 strdump();
1651                 /* die(""); */
1652                 break;
1653         }
1654 }
1655
1656 void
1657 strparse(void) {
1658         /*
1659          * TODO: Implement parsing like for CSI when required.
1660          * Format: ESC type cmd ';' arg0 [';' argn] ESC \
1661          */
1662         return;
1663 }
1664
1665 void
1666 strdump(void) {
1667         int i;
1668         printf("ESC%c", strescseq.type);
1669         for(i = 0; i < strescseq.len; i++) {
1670                 uint c = strescseq.buf[i] & 0xff;
1671                 if(isprint(c)) putchar(c);
1672                 else if(c == '\n') printf("(\\n)");
1673                 else if(c == '\r') printf("(\\r)");
1674                 else if(c == 0x1b) printf("(\\e)");
1675                 else printf("(%02x)", c);
1676         }
1677         printf("ESC\\\n");
1678 }
1679
1680 void
1681 strreset(void) {
1682         memset(&strescseq, 0, sizeof(strescseq));
1683 }
1684
1685 void
1686 tputtab(bool forward) {
1687         uint x = term.c.x;
1688
1689         if(forward) {
1690                 if(x == term.col)
1691                         return;
1692                 for(++x; x < term.col && !term.tabs[x]; ++x)
1693                         /* nothing */ ;
1694         } else {
1695                 if(x == 0)
1696                         return;
1697                 for(--x; x > 0 && !term.tabs[x]; --x)
1698                         /* nothing */ ;
1699         }
1700         tmoveto(x, term.c.y);
1701 }
1702
1703 void
1704 tputc(char *c, int len) {
1705         uchar ascii = *c;
1706
1707         if(iofd != -1)
1708                 write(iofd, c, len);
1709
1710         switch(ascii) {
1711         case '\t':
1712                 tputtab(1);
1713                 return;
1714         case '\b':
1715                 tmoveto(term.c.x-1, term.c.y);
1716                 return;
1717         case '\r':
1718                 tmoveto(0, term.c.y);
1719                 return;
1720         case '\f':
1721         case '\v':
1722         case '\n':
1723                 /* go to first col if the mode is set */
1724                 tnewline(IS_SET(MODE_CRLF));
1725                 return;
1726         case '\a':
1727                 if(term.esc & ESC_STR)
1728                         break;
1729
1730                 if(!(xw.state & WIN_FOCUSED))
1731                         xseturgency(1);
1732                 return;
1733         case '\033':
1734                 csireset();
1735                 term.esc = ESC_START;
1736                 return;
1737         }
1738
1739         if(term.esc & ESC_START) {
1740                 if(term.esc & ESC_CSI) {
1741                         csiescseq.buf[csiescseq.len++] = ascii;
1742                         if(BETWEEN(ascii, 0x40, 0x7E) || csiescseq.len >= ESC_BUF_SIZ) {
1743                                 term.esc = 0;
1744                                 csiparse(), csihandle();
1745                         }
1746                 } else if(term.esc & ESC_STR) {
1747                         switch(ascii) {
1748                         case '\033':
1749                                 term.esc = ESC_START | ESC_STR_END;
1750                                 break;
1751                         case '\a': /* backwards compatibility to xterm */
1752                                 term.esc = 0;
1753                                 strhandle();
1754                                 break;
1755                         default:
1756                                 strescseq.buf[strescseq.len++] = ascii;
1757                                 if(strescseq.len+1 >= STR_BUF_SIZ) {
1758                                         term.esc = 0;
1759                                         strhandle();
1760                                 }
1761                         }
1762                 } else if(term.esc & ESC_STR_END) {
1763                         term.esc = 0;
1764                         if(ascii == '\\')
1765                                 strhandle();
1766                 } else if(term.esc & ESC_ALTCHARSET) {
1767                         switch(ascii) {
1768                         case '0': /* Line drawing set */
1769                                 term.c.attr.mode |= ATTR_GFX;
1770                                 break;
1771                         case 'B': /* USASCII */
1772                                 term.c.attr.mode &= ~ATTR_GFX;
1773                                 break;
1774                         case 'A': /* UK (IGNORED) */
1775                         case '<': /* multinational charset (IGNORED) */
1776                         case '5': /* Finnish (IGNORED) */
1777                         case 'C': /* Finnish (IGNORED) */
1778                         case 'K': /* German (IGNORED) */
1779                                 break;
1780                         default:
1781                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1782                         }
1783                         term.esc = 0;
1784                 } else {
1785                         switch(ascii) {
1786                         case '[':
1787                                 term.esc |= ESC_CSI;
1788                                 break;
1789                         case 'P': /* DCS -- Device Control String */
1790                         case '_': /* APC -- Application Program Command */
1791                         case '^': /* PM -- Privacy Message */
1792                         case ']': /* OSC -- Operating System Command */
1793                         case 'k': /* old title set compatibility */
1794                                 strreset();
1795                                 strescseq.type = ascii;
1796                                 term.esc |= ESC_STR;
1797                                 break;
1798                         case '(': /* set primary charset G0 */
1799                                 term.esc |= ESC_ALTCHARSET;
1800                                 break;
1801                         case ')': /* set secondary charset G1 (IGNORED) */
1802                         case '*': /* set tertiary charset G2 (IGNORED) */
1803                         case '+': /* set quaternary charset G3 (IGNORED) */
1804                                 term.esc = 0;
1805                                 break;
1806                         case 'D': /* IND -- Linefeed */
1807                                 if(term.c.y == term.bot)
1808                                         tscrollup(term.top, 1);
1809                                 else
1810                                         tmoveto(term.c.x, term.c.y+1);
1811                                 term.esc = 0;
1812                                 break;
1813                         case 'E': /* NEL -- Next line */
1814                                 tnewline(1); /* always go to first col */
1815                                 term.esc = 0;
1816                                 break;
1817                         case 'H': /* HTS -- Horizontal tab stop */
1818                                 term.tabs[term.c.x] = 1;
1819                                 term.esc = 0;
1820                                 break;
1821                         case 'M': /* RI -- Reverse index */
1822                                 if(term.c.y == term.top)
1823                                         tscrolldown(term.top, 1);
1824                                 else
1825                                         tmoveto(term.c.x, term.c.y-1);
1826                                 term.esc = 0;
1827                                 break;
1828                         case 'c': /* RIS -- Reset to inital state */
1829                                 treset();
1830                                 term.esc = 0;
1831                                 xclearborders();
1832                                 xresettitle();
1833                                 break;
1834                         case '=': /* DECPAM -- Application keypad */
1835                                 term.mode |= MODE_APPKEYPAD;
1836                                 term.esc = 0;
1837                                 break;
1838                         case '>': /* DECPNM -- Normal keypad */
1839                                 term.mode &= ~MODE_APPKEYPAD;
1840                                 term.esc = 0;
1841                                 break;
1842                         case '7': /* DECSC -- Save Cursor */
1843                                 tcursor(CURSOR_SAVE);
1844                                 term.esc = 0;
1845                                 break;
1846                         case '8': /* DECRC -- Restore Cursor */
1847                                 tcursor(CURSOR_LOAD);
1848                                 term.esc = 0;
1849                                 break;
1850                         case '\\': /* ST -- Stop */
1851                                 term.esc = 0;
1852                                 break;
1853                         default:
1854                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1855                                     (uchar) ascii, isprint(ascii)?ascii:'.');
1856                                 term.esc = 0;
1857                         }
1858                 }
1859         } else {
1860                 if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
1861                         sel.bx = -1;
1862                 if(ascii >= '\020' || term.c.attr.mode & ATTR_GFX) {
1863                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1864                                 tnewline(1); /* always go to first col */
1865                         tsetchar(c);
1866                         if(term.c.x+1 < term.col)
1867                                 tmoveto(term.c.x+1, term.c.y);
1868                         else
1869                                 term.c.state |= CURSOR_WRAPNEXT;
1870                 }
1871         }
1872 }
1873
1874 int
1875 tresize(int col, int row) {
1876         int i, x;
1877         int minrow = MIN(row, term.row);
1878         int mincol = MIN(col, term.col);
1879         int slide = term.c.y - row + 1;
1880
1881         if(col < 1 || row < 1)
1882                 return 0;
1883
1884         /* free unneeded rows */
1885         i = 0;
1886         if(slide > 0) {
1887                 /* slide screen to keep cursor where we expect it -
1888                  * tscrollup would work here, but we can optimize to
1889                  * memmove because we're freeing the earlier lines */
1890                 for(/* i = 0 */; i < slide; i++) {
1891                         free(term.line[i]);
1892                         free(term.alt[i]);
1893                 }
1894                 memmove(term.line, term.line + slide, row * sizeof(Line));
1895                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1896         }
1897         for(i += row; i < term.row; i++) {
1898                 free(term.line[i]);
1899                 free(term.alt[i]);
1900         }
1901
1902         /* resize to new height */
1903         term.line = xrealloc(term.line, row * sizeof(Line));
1904         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
1905         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
1906         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
1907
1908         /* resize each row to new width, zero-pad if needed */
1909         for(i = 0; i < minrow; i++) {
1910                 term.dirty[i] = 1;
1911                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
1912                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
1913                 for(x = mincol; x < col; x++) {
1914                         term.line[i][x].state = 0;
1915                         term.alt[i][x].state = 0;
1916                 }
1917         }
1918
1919         /* allocate any new rows */
1920         for(/* i == minrow */; i < row; i++) {
1921                 term.dirty[i] = 1;
1922                 term.line[i] = xcalloc(col, sizeof(Glyph));
1923                 term.alt [i] = xcalloc(col, sizeof(Glyph));
1924         }
1925         if(col > term.col) {
1926                 bool *bp = term.tabs + term.col;
1927
1928                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
1929                 while(--bp > term.tabs && !*bp)
1930                         /* nothing */ ;
1931                 for(bp += TAB; bp < term.tabs + col; bp += TAB)
1932                         *bp = 1;
1933         }
1934         /* update terminal size */
1935         term.col = col, term.row = row;
1936         /* make use of the LIMIT in tmoveto */
1937         tmoveto(term.c.x, term.c.y);
1938         /* reset scrolling region */
1939         tsetscroll(0, row-1);
1940
1941         return (slide > 0);
1942 }
1943
1944 void
1945 xresize(int col, int row) {
1946         xw.tw = MAX(1, 2*BORDER + col * xw.cw);
1947         xw.th = MAX(1, 2*BORDER + row * xw.ch);
1948
1949         XftDrawChange(xw.xft_draw, xw.buf);
1950 }
1951
1952 void
1953 xloadcols(void) {
1954         int i, r, g, b;
1955         XRenderColor xft_color = { .alpha = 0 };
1956
1957         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
1958         for(i = 0; i < LEN(colorname); i++) {
1959                 if(!colorname[i])
1960                         continue;
1961                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.xft_col[i])) {
1962                         die("Could not allocate color '%s'\n", colorname[i]);
1963                 }
1964         }
1965
1966         /* load colors [16-255] ; same colors as xterm */
1967         for(i = 16, r = 0; r < 6; r++)
1968                 for(g = 0; g < 6; g++)
1969                         for(b = 0; b < 6; b++) {
1970                                 xft_color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1971                                 xft_color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1972                                 xft_color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1973                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &xft_color, &dc.xft_col[i])) {
1974                                         die("Could not allocate color %d\n", i);
1975                                 }
1976                                 i++;
1977                         }
1978
1979         for(r = 0; r < 24; r++, i++) {
1980                 xft_color.red = xft_color.green = xft_color.blue = 0x0808 + 0x0a0a * r;
1981                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &xft_color, &dc.xft_col[i])) {
1982                         dc.xft_col[i] = dc.xft_col[256];
1983                         fprintf(stderr, "Could not allocate color %d\n", i);
1984                 }
1985         }
1986 }
1987
1988 void
1989 xtermclear(int col1, int row1, int col2, int row2) {
1990         XftDrawRect(xw.xft_draw,
1991                         &dc.xft_col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG],
1992                         BORDER + col1 * xw.cw,
1993                         BORDER + row1 * xw.ch,
1994                         (col2-col1+1) * xw.cw,
1995                         (row2-row1+1) * xw.ch);
1996 }
1997
1998 /*
1999  * Absolute coordinates.
2000  */
2001 void
2002 xclear(int x1, int y1, int x2, int y2) {
2003         XftDrawRect(xw.xft_draw,
2004                         &dc.xft_col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG],
2005                         x1, y1, x2-x1, y2-y1);
2006 }
2007
2008 void
2009 xclearborders(void) {
2010         /* top and left border */
2011         xclear(0, 0, BORDER, xw.h);
2012         xclear(0, 0, xw.w, BORDER);
2013
2014         /* lower and right border */
2015         xclear(BORDER, xw.th - 1, xw.w, xw.h);
2016         /* Will just draw what hasn't been drawn by the previous call. */
2017         xclear(xw.tw - 1, BORDER, xw.w, xw.h - xw.th - 2);
2018 }
2019
2020 void
2021 xhints(void) {
2022         XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
2023         XWMHints wm = {.flags = InputHint, .input = 1};
2024         XSizeHints *sizeh = NULL;
2025
2026         sizeh = XAllocSizeHints();
2027         if(xw.isfixed == False) {
2028                 sizeh->flags = PSize | PResizeInc | PBaseSize;
2029                 sizeh->height = xw.h;
2030                 sizeh->width = xw.w;
2031                 sizeh->height_inc = xw.ch;
2032                 sizeh->width_inc = xw.cw;
2033                 sizeh->base_height = 2*BORDER;
2034                 sizeh->base_width = 2*BORDER;
2035         } else {
2036                 sizeh->flags = PMaxSize | PMinSize;
2037                 sizeh->min_width = sizeh->max_width = xw.fw;
2038                 sizeh->min_height = sizeh->max_height = xw.fh;
2039         }
2040
2041         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
2042         XFree(sizeh);
2043 }
2044
2045 void
2046 xinitfont(Font *f, char *fontstr) {
2047         f->xft_set = XftFontOpenName(xw.dpy, xw.scr, fontstr);
2048
2049         if(!f->xft_set)
2050                 die("st: can't open font %s.\n", fontstr);
2051
2052         f->ascent = f->xft_set->ascent;
2053         f->descent = f->xft_set->descent;
2054         f->lbearing = 0;
2055         f->rbearing = f->xft_set->max_advance_width;
2056 }
2057
2058 void
2059 initfonts(char *fontstr) {
2060         char *fstr;
2061
2062         xinitfont(&dc.font, fontstr);
2063
2064         fstr = smstrcat(fontstr, ":weight=bold", NULL);
2065         xinitfont(&dc.bfont, fstr);
2066         free(fstr);
2067
2068         fstr = smstrcat(fontstr, ":slant=italic,oblique", NULL);
2069         xinitfont(&dc.ifont, fstr);
2070         free(fstr);
2071
2072         fstr = smstrcat(fontstr, ":weight=bold:slant=italic,oblique", NULL);
2073         xinitfont(&dc.ibfont, fstr);
2074         free(fstr);
2075 }
2076
2077 void
2078 xinit(void) {
2079         XSetWindowAttributes attrs;
2080         Cursor cursor;
2081         Window parent;
2082         int sw, sh, major, minor;
2083
2084         if(!(xw.dpy = XOpenDisplay(NULL)))
2085                 die("Can't open display\n");
2086         xw.scr = XDefaultScreen(xw.dpy);
2087         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2088
2089         /* font */
2090         initfonts(FONT);
2091
2092         /* XXX: Assuming same size for bold font */
2093         xw.cw = dc.font.rbearing - dc.font.lbearing;
2094         xw.ch = dc.font.ascent + dc.font.descent;
2095
2096         /* colors */
2097         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
2098         xloadcols();
2099
2100         /* adjust fixed window geometry */
2101         if(xw.isfixed) {
2102                 sw = DisplayWidth(xw.dpy, xw.scr);
2103                 sh = DisplayHeight(xw.dpy, xw.scr);
2104                 if(xw.fx < 0)
2105                         xw.fx = sw + xw.fx - xw.fw - 1;
2106                 if(xw.fy < 0)
2107                         xw.fy = sh + xw.fy - xw.fh - 1;
2108
2109                 xw.h = xw.fh;
2110                 xw.w = xw.fw;
2111         } else {
2112                 /* window - default size */
2113                 xw.h = 2*BORDER + term.row * xw.ch;
2114                 xw.w = 2*BORDER + term.col * xw.cw;
2115                 xw.fx = 0;
2116                 xw.fy = 0;
2117         }
2118
2119         attrs.background_pixel = dc.xft_col[DefaultBG].pixel;
2120         attrs.border_pixel = dc.xft_col[DefaultBG].pixel;
2121         attrs.bit_gravity = NorthWestGravity;
2122         attrs.event_mask = FocusChangeMask | KeyPressMask
2123                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
2124                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
2125         attrs.colormap = xw.cmap;
2126
2127         parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
2128         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
2129                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
2130                         xw.vis,
2131                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
2132                         | CWColormap,
2133                         &attrs);
2134
2135         /* double buffering */
2136         if(!XdbeQueryExtension(xw.dpy, &major, &minor))
2137                 die("Xdbe extension is not present\n");
2138         xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win, XdbeCopied);
2139
2140         /* Xft rendering context */
2141         xw.xft_draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
2142
2143         /* input methods */
2144         xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
2145         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
2146                                            | XIMStatusNothing, XNClientWindow, xw.win,
2147                                            XNFocusWindow, xw.win, NULL);
2148         /* gc */
2149         dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
2150
2151         /* white cursor, black outline */
2152         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
2153         XDefineCursor(xw.dpy, xw.win, cursor);
2154         XRecolorCursor(xw.dpy, cursor,
2155                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
2156                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
2157
2158         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
2159
2160         xresettitle();
2161         XMapWindow(xw.dpy, xw.win);
2162         xhints();
2163         XSync(xw.dpy, 0);
2164 }
2165
2166 void
2167 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
2168         int fg = base.fg, bg = base.bg, temp;
2169         int winx = BORDER+x*xw.cw, winy = BORDER+y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
2170         Font *font = &dc.font;
2171         XGlyphInfo extents;
2172
2173         /* only switch default fg/bg if term is in RV mode */
2174         if(IS_SET(MODE_REVERSE)) {
2175                 if(fg == DefaultFG)
2176                         fg = DefaultBG;
2177                 if(bg == DefaultBG)
2178                         bg = DefaultFG;
2179         }
2180
2181         if(base.mode & ATTR_REVERSE)
2182                 temp = fg, fg = bg, bg = temp;
2183
2184         if(base.mode & ATTR_BOLD) {
2185                 fg += 8;
2186                 font = &dc.bfont;
2187         }
2188
2189         if(base.mode & ATTR_ITALIC)
2190                 font = &dc.ifont;
2191         if(base.mode & (ATTR_ITALIC|ATTR_ITALIC))
2192                 font = &dc.ibfont;
2193
2194         XftTextExtentsUtf8(xw.dpy, font->xft_set, (FcChar8 *)s, bytelen, &extents);
2195         width = extents.xOff;
2196         XftDrawRect(xw.xft_draw, &dc.xft_col[bg], winx, winy - font->ascent, width, xw.ch);
2197         XftDrawStringUtf8(xw.xft_draw, &dc.xft_col[fg], font->xft_set, winx, winy, (FcChar8 *)s, bytelen);
2198
2199         if(base.mode & ATTR_UNDERLINE) {
2200                 XftDrawRect(xw.xft_draw, &dc.xft_col[fg], winx, winy+1,
2201                                 width, 1);
2202         }
2203 }
2204
2205 void
2206 xdrawcursor(void) {
2207         static int oldx = 0;
2208         static int oldy = 0;
2209         int sl;
2210         Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
2211
2212         LIMIT(oldx, 0, term.col-1);
2213         LIMIT(oldy, 0, term.row-1);
2214
2215         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
2216                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
2217
2218         /* remove the old cursor */
2219         if(term.line[oldy][oldx].state & GLYPH_SET) {
2220                 sl = utf8size(term.line[oldy][oldx].c);
2221                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
2222         } else
2223                 xtermclear(oldx, oldy, oldx, oldy);
2224
2225         /* draw the new one */
2226         if(!(term.c.state & CURSOR_HIDE)) {
2227                 if(!(xw.state & WIN_FOCUSED))
2228                         g.bg = DefaultUCS;
2229
2230                 if(IS_SET(MODE_REVERSE))
2231                         g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
2232
2233                 sl = utf8size(g.c);
2234                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
2235                 oldx = term.c.x, oldy = term.c.y;
2236         }
2237 }
2238
2239 void
2240 xresettitle(void) {
2241         XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
2242 }
2243
2244 void
2245 redraw(void) {
2246         struct timespec tv = {0, REDRAW_TIMEOUT * 1000};
2247
2248         xclearborders();
2249         tfulldirt();
2250         draw();
2251         XSync(xw.dpy, False); /* necessary for a good tput flash */
2252         nanosleep(&tv, NULL);
2253 }
2254
2255 void
2256 draw(void) {
2257         XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
2258
2259         drawregion(0, 0, term.col, term.row);
2260         XdbeSwapBuffers(xw.dpy, swpinfo, 1);
2261 }
2262
2263 void
2264 drawregion(int x1, int y1, int x2, int y2) {
2265         int ic, ib, x, y, ox, sl;
2266         Glyph base, new;
2267         char buf[DRAW_BUF_SIZ];
2268         bool ena_sel = sel.bx != -1, alt = IS_SET(MODE_ALTSCREEN);
2269
2270         if((sel.alt && !alt) || (!sel.alt && alt))
2271                 ena_sel = 0;
2272         if(!(xw.state & WIN_VISIBLE))
2273                 return;
2274
2275         for(y = y1; y < y2; y++) {
2276                 if(!term.dirty[y])
2277                         continue;
2278                 xtermclear(0, y, term.col, y);
2279                 term.dirty[y] = 0;
2280                 base = term.line[y][0];
2281                 ic = ib = ox = 0;
2282                 for(x = x1; x < x2; x++) {
2283                         new = term.line[y][x];
2284                         if(ena_sel && *(new.c) && selected(x, y))
2285                                 new.mode ^= ATTR_REVERSE;
2286                         if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
2287                                                   ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
2288                                 xdraws(buf, base, ox, y, ic, ib);
2289                                 ic = ib = 0;
2290                         }
2291                         if(new.state & GLYPH_SET) {
2292                                 if(ib == 0) {
2293                                         ox = x;
2294                                         base = new;
2295                                 }
2296                                 sl = utf8size(new.c);
2297                                 memcpy(buf+ib, new.c, sl);
2298                                 ib += sl;
2299                                 ++ic;
2300                         }
2301                 }
2302                 if(ib > 0)
2303                         xdraws(buf, base, ox, y, ic, ib);
2304         }
2305         xdrawcursor();
2306 }
2307
2308 void
2309 expose(XEvent *ev) {
2310         XExposeEvent *e = &ev->xexpose;
2311         if(xw.state & WIN_REDRAW) {
2312                 if(!e->count)
2313                         xw.state &= ~WIN_REDRAW;
2314         }
2315 }
2316
2317 void
2318 visibility(XEvent *ev) {
2319         XVisibilityEvent *e = &ev->xvisibility;
2320         if(e->state == VisibilityFullyObscured)
2321                 xw.state &= ~WIN_VISIBLE;
2322         else if(!(xw.state & WIN_VISIBLE))
2323                 /* need a full redraw for next Expose, not just a buf copy */
2324                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
2325 }
2326
2327 void
2328 unmap(XEvent *ev) {
2329         xw.state &= ~WIN_VISIBLE;
2330 }
2331
2332 void
2333 xseturgency(int add) {
2334         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
2335         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
2336         XSetWMHints(xw.dpy, xw.win, h);
2337         XFree(h);
2338 }
2339
2340 void
2341 focus(XEvent *ev) {
2342         if(ev->type == FocusIn) {
2343                 xw.state |= WIN_FOCUSED;
2344                 xseturgency(0);
2345         } else
2346                 xw.state &= ~WIN_FOCUSED;
2347 }
2348
2349 char*
2350 kmap(KeySym k, uint state) {
2351         int i;
2352         state &= ~Mod2Mask;
2353         for(i = 0; i < LEN(key); i++) {
2354                 uint mask = key[i].mask;
2355                 if(key[i].k == k && ((state & mask) == mask || (mask == XK_NO_MOD && !state)))
2356                         return (char*)key[i].s;
2357         }
2358         return NULL;
2359 }
2360
2361 void
2362 kpress(XEvent *ev) {
2363         XKeyEvent *e = &ev->xkey;
2364         KeySym ksym;
2365         char buf[32];
2366         char *customkey;
2367         int len;
2368         int meta;
2369         int shift;
2370         Status status;
2371
2372         if (IS_SET(MODE_KBDLOCK))
2373                 return;
2374         meta = e->state & Mod1Mask;
2375         shift = e->state & ShiftMask;
2376         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
2377
2378         /* 1. custom keys from config.h */
2379         if((customkey = kmap(ksym, e->state)))
2380                 ttywrite(customkey, strlen(customkey));
2381         /* 2. hardcoded (overrides X lookup) */
2382         else
2383                 switch(ksym) {
2384                 case XK_Up:
2385                 case XK_Down:
2386                 case XK_Left:
2387                 case XK_Right:
2388                         /* XXX: shift up/down doesn't work */
2389                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
2390                         ttywrite(buf, 3);
2391                         break;
2392                 case XK_Insert:
2393                         if(shift)
2394                                 selpaste();
2395                         break;
2396                 case XK_Return:
2397                         if(IS_SET(MODE_CRLF))
2398                                 ttywrite("\r\n", 2);
2399                         else
2400                                 ttywrite("\r", 1);
2401                         break;
2402                         /* 3. X lookup  */
2403                 default:
2404                         if(len > 0) {
2405                                 if(meta && len == 1)
2406                                         ttywrite("\033", 1);
2407                                 ttywrite(buf, len);
2408                         }
2409                         break;
2410                 }
2411 }
2412
2413 void
2414 cmessage(XEvent *e) {
2415         /* See xembed specs
2416            http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
2417         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
2418                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
2419                         xw.state |= WIN_FOCUSED;
2420                         xseturgency(0);
2421                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
2422                         xw.state &= ~WIN_FOCUSED;
2423                 }
2424         }
2425 }
2426
2427 void
2428 resize(XEvent *e) {
2429         int col, row;
2430
2431         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
2432                 return;
2433
2434         xw.w = e->xconfigure.width;
2435         xw.h = e->xconfigure.height;
2436         col = (xw.w - 2*BORDER) / xw.cw;
2437         row = (xw.h - 2*BORDER) / xw.ch;
2438         if(col == term.col && row == term.row)
2439                 return;
2440
2441         tresize(col, row);
2442         xresize(col, row);
2443         xclearborders();
2444         ttyresize();
2445 }
2446
2447 void
2448 run(void) {
2449         XEvent ev;
2450         fd_set rfd;
2451         int xfd = XConnectionNumber(xw.dpy), i;
2452         struct timeval drawtimeout, *tv = NULL;
2453
2454         for(i = 0;; i++) {
2455                 FD_ZERO(&rfd);
2456                 FD_SET(cmdfd, &rfd);
2457                 FD_SET(xfd, &rfd);
2458                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
2459                         if(errno == EINTR)
2460                                 continue;
2461                         die("select failed: %s\n", SERRNO);
2462                 }
2463
2464                 /*
2465                  * Stop after a certain number of reads so the user does not
2466                  * feel like the system is stuttering.
2467                  */
2468                 if(i < 1000 && FD_ISSET(cmdfd, &rfd)) {
2469                         ttyread();
2470
2471                         /*
2472                          * Just wait a bit so it isn't disturbing the
2473                          * user and the system is able to write something.
2474                          */
2475                         drawtimeout.tv_sec = 0;
2476                         drawtimeout.tv_usec = 5;
2477                         tv = &drawtimeout;
2478                         continue;
2479                 }
2480                 i = 0;
2481                 tv = NULL;
2482
2483                 while(XPending(xw.dpy)) {
2484                         XNextEvent(xw.dpy, &ev);
2485                         if(XFilterEvent(&ev, xw.win))
2486                                 continue;
2487                         if(handler[ev.type])
2488                                 (handler[ev.type])(&ev);
2489                 }
2490
2491                 draw();
2492                 XFlush(xw.dpy);
2493         }
2494 }
2495
2496 int
2497 main(int argc, char *argv[]) {
2498         int i, bitm, xr, yr;
2499         uint wr, hr;
2500
2501         xw.fw = xw.fh = xw.fx = xw.fy = 0;
2502         xw.isfixed = False;
2503
2504         for(i = 1; i < argc; i++) {
2505                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
2506                 case 't':
2507                         if(++i < argc) opt_title = argv[i];
2508                         break;
2509                 case 'c':
2510                         if(++i < argc) opt_class = argv[i];
2511                         break;
2512                 case 'w':
2513                         if(++i < argc) opt_embed = argv[i];
2514                         break;
2515                 case 'f':
2516                         if(++i < argc) opt_io = argv[i];
2517                         break;
2518                 case 'e':
2519                         /* eat every remaining arguments */
2520                         if(++i < argc) opt_cmd = &argv[i];
2521                         goto run;
2522                 case 'g':
2523                         if(++i >= argc)
2524                                 break;
2525
2526                         bitm = XParseGeometry(argv[i], &xr, &yr, &wr, &hr);
2527                         if(bitm & XValue)
2528                                 xw.fx = xr;
2529                         if(bitm & YValue)
2530                                 xw.fy = yr;
2531                         if(bitm & WidthValue)
2532                                 xw.fw = (int)wr;
2533                         if(bitm & HeightValue)
2534                                 xw.fh = (int)hr;
2535                         if(bitm & XNegative && xw.fx == 0)
2536                                 xw.fx = -1;
2537                         if(bitm & XNegative && xw.fy == 0)
2538                                 xw.fy = -1;
2539
2540                         if(xw.fh != 0 && xw.fw != 0)
2541                                 xw.isfixed = True;
2542                         break;
2543                 case 'v':
2544                 default:
2545                         die(USAGE);
2546                 }
2547         }
2548
2549  run:
2550         setlocale(LC_CTYPE, "");
2551         tnew(80, 24);
2552         ttynew();
2553         xinit();
2554         selinit();
2555         run();
2556         return 0;
2557 }
2558