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 <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <signal.h>
  13 #include <sys/ioctl.h>
  14 #include <sys/select.h>
  15 #include <sys/stat.h>
  16 #include <sys/types.h>
  17 #include <sys/wait.h>
  18 #include <unistd.h>
  19 #include <X11/Xatom.h>
  20 #include <X11/Xlib.h>
  21 #include <X11/Xutil.h>
  22 #include <X11/cursorfont.h>
  23 #include <X11/keysym.h>
  24
  25 #if   defined(__linux)
  26  #include <pty.h>
  27 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  28  #include <util.h>
  29 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  30  #include <libutil.h>
  31 #endif
  32
  33 #define USAGE \
  34         "st-" VERSION ", (c) 2010 st engineers\n" \
  35         "usage: st [-t title] [-c class] [-v] [-e cmd]\n"
  36
  37 /* Arbitrary sizes */
  38 #define ESC_TITLE_SIZ 256
  39 #define ESC_BUF_SIZ   256
  40 #define ESC_ARG_SIZ   16
  41 #define DRAW_BUF_SIZ  1024
  42 #define UTF_SIZ       4
  43
  44 #define SERRNO strerror(errno)
  45 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  46 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  47 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  48 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  49 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  50 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  51 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  52 #define IS_SET(flag) (term.mode & (flag))
  53
  54 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
  55 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
  56 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
  57        CURSOR_SAVE, CURSOR_LOAD };
  58 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
  59 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
  60 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8,
  61        MODE_CRLF=16 };
  62 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
  63 enum { SCREEN_UPDATE, SCREEN_REDRAW };
  64 enum { WIN_VISIBLE=1, WIN_REDRAW=2, WIN_FOCUSED=4 };
  65
  66 #undef B0
  67 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
  68
  69 typedef struct {
  70         char c[UTF_SIZ];     /* character code */
  71         char mode;  /* attribute flags */
  72         int fg;     /* foreground      */
  73         int bg;     /* background      */
  74         char state; /* state flags     */
  75 } Glyph;
  76
  77 typedef Glyph* Line;
  78
  79 typedef struct {
  80         Glyph attr;      /* current char attributes */
  81         int x;
  82         int y;
  83         char state;
  84 } TCursor;
  85
  86 /* CSI Escape sequence structs */
  87 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
  88 typedef struct {
  89         char buf[ESC_BUF_SIZ]; /* raw string */
  90         int len;                           /* raw string length */
  91         char priv;
  92         int arg[ESC_ARG_SIZ];
  93         int narg;                          /* nb of args */
  94         char mode;
  95 } CSIEscape;
  96
  97 /* Internal representation of the screen */
  98 typedef struct {
  99         int row;        /* nb row */
 100         int col;        /* nb col */
 101         Line* line;     /* screen */
 102         Line* alt;      /* alternate screen */
 103         TCursor c;      /* cursor */
 104         int top;        /* top    scroll limit */
 105         int bot;        /* bottom scroll limit */
 106         int mode;       /* terminal mode flags */
 107         int esc;        /* escape state flags */
 108         char title[ESC_TITLE_SIZ];
 109         int titlelen;
 110 } Term;
 111
 112 /* Purely graphic info */
 113 typedef struct {
 114         Display* dpy;
 115         Colormap cmap;
 116         Window win;
 117         Pixmap buf;
 118         XIM xim;
 119         XIC xic;
 120         int scr;
 121         int w;  /* window width  */
 122         int h;  /* window height */
 123         int bufw; /* pixmap width  */
 124         int bufh; /* pixmap height */
 125         int ch; /* char height */
 126         int cw; /* char width  */
 127         char state; /* focus, redraw, visible */
 128 } XWindow;
 129
 130 typedef struct {
 131         KeySym k;
 132         char s[ESC_BUF_SIZ];
 133 } Key;
 134
 135 /* Drawing Context */
 136 typedef struct {
 137         unsigned long col[256];
 138         GC gc;
 139         struct {
 140                 int ascent;
 141                 int descent;
 142                 short lbearing;
 143                 short rbearing;
 144                 XFontSet set;
 145         } font, bfont;
 146 } DC;
 147
 148 /* TODO: use better name for vars... */
 149 typedef struct {
 150         int mode;
 151         int bx, by;
 152         int ex, ey;
 153         struct {int x, y;}  b, e;
 154         char *clip;
 155         Atom xtarget;
 156 } Selection;
 157
 158 #include "config.h"
 159
 160 static void die(const char *errstr, ...);
 161 static void draw(int);
 162 static void execsh(void);
 163 static void sigchld(int);
 164 static void run(void);
 165
 166 static void csidump(void);
 167 static void csihandle(void);
 168 static void csiparse(void);
 169 static void csireset(void);
 170
 171 static void tclearregion(int, int, int, int);
 172 static void tcursor(int);
 173 static void tdeletechar(int);
 174 static void tdeleteline(int);
 175 static void tinsertblank(int);
 176 static void tinsertblankline(int);
 177 static void tmoveto(int, int);
 178 static void tnew(int, int);
 179 static void tnewline(int);
 180 static void tputtab(void);
 181 static void tputc(char*);
 182 static void treset(void);
 183 static int tresize(int, int);
 184 static void tscrollup(int, int);
 185 static void tscrolldown(int, int);
 186 static void tsetattr(int*, int);
 187 static void tsetchar(char*);
 188 static void tsetscroll(int, int);
 189 static void tswapscreen(void);
 190
 191 static void ttynew(void);
 192 static void ttyread(void);
 193 static void ttyresize(int, int);
 194 static void ttywrite(const char *, size_t);
 195
 196 static void xdraws(char *, Glyph, int, int, int, int);
 197 static void xhints(void);
 198 static void xclear(int, int, int, int);
 199 static void xdrawcursor(void);
 200 static void xinit(void);
 201 static void xloadcols(void);
 202 static void xseturgency(int);
 203 static void xsetsel(char*);
 204 static void xresize(int, int);
 205
 206 static void expose(XEvent *);
 207 static void visibility(XEvent *);
 208 static void unmap(XEvent *);
 209 static char* kmap(KeySym);
 210 static void kpress(XEvent *);
 211 static void resize(XEvent *);
 212 static void focus(XEvent *);
 213 static void brelease(XEvent *);
 214 static void bpress(XEvent *);
 215 static void bmotion(XEvent *);
 216 static void selnotify(XEvent *);
 217 static void selrequest(XEvent *);
 218
 219 static void selinit(void);
 220 static inline int selected(int, int);
 221 static void selcopy(void);
 222 static void selpaste(void);
 223
 224 static int utf8decode(char *, long *);
 225 static int utf8encode(long *, char *);
 226 static int utf8size(char *);
 227 static int isfullutf8(char *, int);
 228
 229 static void (*handler[LASTEvent])(XEvent *) = {
 230         [KeyPress] = kpress,
 231         [ConfigureNotify] = resize,
 232         [VisibilityNotify] = visibility,
 233         [UnmapNotify] = unmap,
 234         [Expose] = expose,
 235         [FocusIn] = focus,
 236         [FocusOut] = focus,
 237         [MotionNotify] = bmotion,
 238         [ButtonPress] = bpress,
 239         [ButtonRelease] = brelease,
 240         [SelectionNotify] = selnotify,
 241         [SelectionRequest] = selrequest,
 242 };
 243
 244 /* Globals */
 245 static DC dc;
 246 static XWindow xw;
 247 static Term term;
 248 static CSIEscape escseq;
 249 static int cmdfd;
 250 static pid_t pid;
 251 static Selection sel;
 252 static char **opt_cmd  = NULL;
 253 static char *opt_title = NULL;
 254 static char *opt_class = NULL;
 255
 256 int
 257 utf8decode(char *s, long *u) {
 258         unsigned char c;
 259         int i, n, rtn;
 260
 261         rtn = 1;
 262         c = *s;
 263         if(~c&B7) { /* 0xxxxxxx */
 264                 *u = c;
 265                 return rtn;
 266         } else if((c&(B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 267                 *u = c&(B4|B3|B2|B1|B0);
 268                 n = 1;
 269         } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 270                 *u = c&(B3|B2|B1|B0);
 271                 n = 2;
 272         } else if((c&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 273                 *u = c&(B2|B1|B0);
 274                 n = 3;
 275         } else
 276                 goto invalid;
 277         for(i=n,++s; i>0; --i,++rtn,++s) {
 278                 c = *s;
 279                 if((c&(B7|B6)) != B7) /* 10xxxxxx */
 280                         goto invalid;
 281                 *u <<= 6;
 282                 *u |= c&(B5|B4|B3|B2|B1|B0);
 283         }
 284         if((n == 1 && *u < 0x80) ||
 285            (n == 2 && *u < 0x800) ||
 286            (n == 3 && *u < 0x10000) ||
 287            (*u >= 0xD800 && *u <= 0xDFFF))
 288                 goto invalid;
 289         return rtn;
 290 invalid:
 291         *u = 0xFFFD;
 292         return rtn;
 293 }
 294
 295 int
 296 utf8encode(long *u, char *s) {
 297         unsigned char *sp;
 298         unsigned long uc;
 299         int i, n;
 300
 301         sp = (unsigned char*) s;
 302         uc = *u;
 303         if(uc < 0x80) {
 304                 *sp = uc; /* 0xxxxxxx */
 305                 return 1;
 306         } else if(*u < 0x800) {
 307                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 308                 n = 1;
 309         } else if(uc < 0x10000) {
 310                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 311                 n = 2;
 312         } else if(uc <= 0x10FFFF) {
 313                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 314                 n = 3;
 315         } else {
 316                 goto invalid;
 317         }
 318         for(i=n,++sp; i>0; --i,++sp)
 319                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 320         return n+1;
 321 invalid:
 322         /* U+FFFD */
 323         *s++ = '\xEF';
 324         *s++ = '\xBF';
 325         *s = '\xBD';
 326         return 3;
 327 }
 328
 329 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 330    UTF-8 otherwise return 0 */
 331 int
 332 isfullutf8(char *s, int b) {
 333         unsigned char *c1, *c2, *c3;
 334
 335         c1 = (unsigned char *) s;
 336         c2 = (unsigned char *) ++s;
 337         c3 = (unsigned char *) ++s;
 338         if(b < 1)
 339                 return 0;
 340         else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
 341                 return 0;
 342         else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 343             ((b == 1) ||
 344             ((b == 2) && (*c2&(B7|B6)) == B7)))
 345                 return 0;
 346         else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 347             ((b == 1) ||
 348             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 349             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
 350                 return 0;
 351         else
 352                 return 1;
 353 }
 354
 355 int
 356 utf8size(char *s) {
 357         unsigned char c = *s;
 358
 359         if (~c&B7)
 360                 return 1;
 361         else if ((c&(B7|B6|B5)) == (B7|B6))
 362                 return 2;
 363         else if ((c&(B7|B6|B5|B4)) == (B7|B6|B5))
 364                 return 3;
 365         else
 366                 return 4;
 367 }
 368
 369 void
 370 selinit(void) {
 371         sel.mode = 0;
 372         sel.bx = -1;
 373         sel.clip = NULL;
 374         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 375         if(sel.xtarget == None)
 376                 sel.xtarget = XA_STRING;
 377 }
 378
 379 static inline int
 380 selected(int x, int y) {
 381         if(sel.ey == y && sel.by == y) {
 382                 int bx = MIN(sel.bx, sel.ex);
 383                 int ex = MAX(sel.bx, sel.ex);
 384                 return BETWEEN(x, bx, ex);
 385         }
 386         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 387                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 388 }
 389
 390 void
 391 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 392         if(b)
 393                 *b = e->xbutton.button;
 394
 395         *x = (e->xbutton.x - BORDER)/xw.cw;
 396         *y = (e->xbutton.y - BORDER)/xw.ch;
 397         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 398         sel.b.y = MIN(sel.by, sel.ey);
 399         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 400         sel.e.y = MAX(sel.by, sel.ey);
 401 }
 402
 403 void
 404 bpress(XEvent *e) {
 405         sel.mode = 1;
 406         sel.ex = sel.bx = (e->xbutton.x - BORDER)/xw.cw;
 407         sel.ey = sel.by = (e->xbutton.y - BORDER)/xw.ch;
 408 }
 409
 410 void
 411 selcopy(void) {
 412         char *str, *ptr;
 413         int x, y, sz, sl, ls = 0;
 414
 415         if(sel.bx == -1)
 416                 str = NULL;
 417         else {
 418                 sz = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 419                 ptr = str = malloc(sz);
 420                 for(y = 0; y < term.row; y++) {
 421                         for(x = 0; x < term.col; x++)
 422                                 if(term.line[y][x].state & GLYPH_SET && (ls = selected(x, y))) {
 423                                         sl = utf8size(term.line[y][x].c);
 424                                         memcpy(ptr, term.line[y][x].c, sl);
 425                                         ptr += sl;
 426                                 }
 427                         if(ls && y < sel.e.y)
 428                                 *ptr++ = '\n';
 429                 }
 430                 *ptr = 0;
 431         }
 432         xsetsel(str);
 433 }
 434
 435 void
 436 selnotify(XEvent *e) {
 437         unsigned long nitems;
 438         unsigned long ofs, rem;
 439         int format;
 440         unsigned char *data;
 441         Atom type;
 442
 443         ofs = 0;
 444         do {
 445                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 446                                         False, AnyPropertyType, &type, &format,
 447                                         &nitems, &rem, &data)) {
 448                         fprintf(stderr, "Clipboard allocation failed\n");
 449                         return;
 450                 }
 451                 ttywrite((const char *) data, nitems * format / 8);
 452                 XFree(data);
 453                 /* number of 32-bit chunks returned */
 454                 ofs += nitems * format / 32;
 455         } while(rem > 0);
 456 }
 457
 458 void
 459 selpaste() {
 460         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
 461 }
 462
 463 void
 464 selrequest(XEvent *e) {
 465         XSelectionRequestEvent *xsre;
 466         XSelectionEvent xev;
 467         Atom xa_targets;
 468
 469         xsre = (XSelectionRequestEvent *) e;
 470         xev.type = SelectionNotify;
 471         xev.requestor = xsre->requestor;
 472         xev.selection = xsre->selection;
 473         xev.target = xsre->target;
 474         xev.time = xsre->time;
 475         /* reject */
 476         xev.property = None;
 477
 478         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 479         if(xsre->target == xa_targets) {
 480                 /* respond with the supported type */
 481                 Atom string = sel.xtarget;
 482                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 483                                 XA_ATOM, 32, PropModeReplace,
 484                                 (unsigned char *) &string, 1);
 485                 xev.property = xsre->property;
 486         } else if(xsre->target == sel.xtarget) {
 487                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 488                                 xsre->target, 8, PropModeReplace,
 489                                 (unsigned char *) sel.clip, strlen(sel.clip));
 490                 xev.property = xsre->property;
 491         }
 492
 493         /* all done, send a notification to the listener */
 494         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 495                 fprintf(stderr, "Error sending SelectionNotify event\n");
 496 }
 497
 498 void
 499 xsetsel(char *str) {
 500         /* register the selection for both the clipboard and the primary */
 501         Atom clipboard;
 502
 503         free(sel.clip);
 504         sel.clip = str;
 505
 506         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 507
 508         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 509         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 510
 511         XFlush(xw.dpy);
 512 }
 513
 514 /* TODO: doubleclick to select word */
 515 void
 516 brelease(XEvent *e) {
 517         int b;
 518         sel.mode = 0;
 519         getbuttoninfo(e, &b, &sel.ex, &sel.ey);
 520         if(sel.bx==sel.ex && sel.by==sel.ey) {
 521                 sel.bx = -1;
 522                 if(b==2)
 523                         selpaste();
 524         } else {
 525                 if(b==1)
 526                         selcopy();
 527         }
 528         draw(1);
 529 }
 530
 531 void
 532 bmotion(XEvent *e) {
 533         if (sel.mode) {
 534                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 535                 /* XXX: draw() can't keep up, disabled for now.
 536                    selection is visible on button release.
 537                    draw(1); */
 538         }
 539 }
 540
 541 void
 542 die(const char *errstr, ...) {
 543         va_list ap;
 544
 545         va_start(ap, errstr);
 546         vfprintf(stderr, errstr, ap);
 547         va_end(ap);
 548         exit(EXIT_FAILURE);
 549 }
 550
 551 void
 552 execsh(void) {
 553         char **args;
 554         char *envshell = getenv("SHELL");
 555
 556         DEFAULT(envshell, "sh");
 557         putenv("TERM="TNAME);
 558         args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
 559         execvp(args[0], args);
 560         exit(EXIT_FAILURE);
 561 }
 562
 563 void
 564 sigchld(int a) {
 565         int stat = 0;
 566         if(waitpid(pid, &stat, 0) < 0)
 567                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 568         if(WIFEXITED(stat))
 569                 exit(WEXITSTATUS(stat));
 570         else
 571                 exit(EXIT_FAILURE);
 572 }
 573
 574 void
 575 ttynew(void) {
 576         int m, s;
 577
 578         /* seems to work fine on linux, openbsd and freebsd */
 579         struct winsize w = {term.row, term.col, 0, 0};
 580         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 581                 die("openpty failed: %s\n", SERRNO);
 582
 583         switch(pid = fork()) {
 584         case -1:
 585                 die("fork failed\n");
 586                 break;
 587         case 0:
 588                 setsid(); /* create a new process group */
 589                 dup2(s, STDIN_FILENO);
 590                 dup2(s, STDOUT_FILENO);
 591                 dup2(s, STDERR_FILENO);
 592                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 593                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 594                 close(s);
 595                 close(m);
 596                 execsh();
 597                 break;
 598         default:
 599                 close(s);
 600                 cmdfd = m;
 601                 signal(SIGCHLD, sigchld);
 602         }
 603 }
 604
 605 void
 606 dump(char c) {
 607         static int col;
 608         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 609         if(++col % 10 == 0)
 610                 fprintf(stderr, "\n");
 611 }
 612
 613 void
 614 ttyread(void) {
 615         static char buf[BUFSIZ];
 616         static int buflen = 0;
 617         char *ptr;
 618         char s[UTF_SIZ];
 619         int charsize; /* size of utf8 char in bytes */
 620         long utf8c;
 621         int ret;
 622
 623         /* append read bytes to unprocessed bytes */
 624         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
 625                 die("Couldn't read from shell: %s\n", SERRNO);
 626
 627         /* process every complete utf8 char */
 628         buflen += ret;
 629         ptr = buf;
 630         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
 631                 charsize = utf8decode(ptr, &utf8c);
 632                 utf8encode(&utf8c, s);
 633                 tputc(s);
 634                 ptr    += charsize;
 635                 buflen -= charsize;
 636         }
 637
 638         /* keep any uncomplete utf8 char for the next call */
 639         memmove(buf, ptr, buflen);
 640 }
 641
 642 void
 643 ttywrite(const char *s, size_t n) {
 644         if(write(cmdfd, s, n) == -1)
 645                 die("write error on tty: %s\n", SERRNO);
 646 }
 647
 648 void
 649 ttyresize(int x, int y) {
 650         struct winsize w;
 651
 652         w.ws_row = term.row;
 653         w.ws_col = term.col;
 654         w.ws_xpixel = w.ws_ypixel = 0;
 655         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 656                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 657 }
 658
 659 void
 660 tcursor(int mode) {
 661         static TCursor c;
 662
 663         if(mode == CURSOR_SAVE)
 664                 c = term.c;
 665         else if(mode == CURSOR_LOAD)
 666                 term.c = c, tmoveto(c.x, c.y);
 667 }
 668
 669 void
 670 treset(void) {
 671         term.c = (TCursor){{
 672                 .mode = ATTR_NULL,
 673                 .fg = DefaultFG,
 674                 .bg = DefaultBG
 675         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 676
 677         term.top = 0, term.bot = term.row - 1;
 678         term.mode = MODE_WRAP;
 679         tclearregion(0, 0, term.col-1, term.row-1);
 680 }
 681
 682 void
 683 tnew(int col, int row) {
 684         /* set screen size */
 685         term.row = row, term.col = col;
 686         term.line = malloc(term.row * sizeof(Line));
 687         term.alt  = malloc(term.row * sizeof(Line));
 688         for(row = 0 ; row < term.row; row++) {
 689                 term.line[row] = malloc(term.col * sizeof(Glyph));
 690                 term.alt [row] = malloc(term.col * sizeof(Glyph));
 691         }
 692         /* setup screen */
 693         treset();
 694 }
 695
 696 void
 697 tswapscreen(void) {
 698         Line* tmp = term.line;
 699         term.line = term.alt;
 700         term.alt = tmp;
 701         term.mode ^= MODE_ALTSCREEN;
 702 }
 703
 704 void
 705 tscrolldown(int orig, int n) {
 706         int i;
 707         Line temp;
 708
 709         LIMIT(n, 0, term.bot-orig+1);
 710
 711         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 712
 713         for(i = term.bot; i >= orig+n; i--) {
 714                 temp = term.line[i];
 715                 term.line[i] = term.line[i-n];
 716                 term.line[i-n] = temp;
 717         }
 718 }
 719
 720 void
 721 tscrollup(int orig, int n) {
 722         int i;
 723         Line temp;
 724         LIMIT(n, 0, term.bot-orig+1);
 725
 726         tclearregion(0, orig, term.col-1, orig+n-1);
 727
 728         for(i = orig; i <= term.bot-n; i++) {
 729                  temp = term.line[i];
 730                  term.line[i] = term.line[i+n];
 731                  term.line[i+n] = temp;
 732         }
 733 }
 734
 735 void
 736 tnewline(int first_col) {
 737         int y = term.c.y;
 738         if(y == term.bot)
 739                 tscrollup(term.top, 1);
 740         else
 741                 y++;
 742         tmoveto(first_col ? 0 : term.c.x, y);
 743 }
 744
 745 void
 746 csiparse(void) {
 747         /* int noarg = 1; */
 748         char *p = escseq.buf;
 749
 750         escseq.narg = 0;
 751         if(*p == '?')
 752                 escseq.priv = 1, p++;
 753
 754         while(p < escseq.buf+escseq.len) {
 755                 while(isdigit(*p)) {
 756                         escseq.arg[escseq.narg] *= 10;
 757                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 758                 }
 759                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 760                         escseq.narg++, p++;
 761                 else {
 762                         escseq.mode = *p;
 763                         escseq.narg++;
 764                         return;
 765                 }
 766         }
 767 }
 768
 769 void
 770 tmoveto(int x, int y) {
 771         LIMIT(x, 0, term.col-1);
 772         LIMIT(y, 0, term.row-1);
 773         term.c.state &= ~CURSOR_WRAPNEXT;
 774         term.c.x = x;
 775         term.c.y = y;
 776 }
 777
 778 void
 779 tsetchar(char *c) {
 780         term.line[term.c.y][term.c.x] = term.c.attr;
 781         memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
 782         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
 783 }
 784
 785 void
 786 tclearregion(int x1, int y1, int x2, int y2) {
 787         int x, y, temp;
 788
 789         if(x1 > x2)
 790                 temp = x1, x1 = x2, x2 = temp;
 791         if(y1 > y2)
 792                 temp = y1, y1 = y2, y2 = temp;
 793
 794         LIMIT(x1, 0, term.col-1);
 795         LIMIT(x2, 0, term.col-1);
 796         LIMIT(y1, 0, term.row-1);
 797         LIMIT(y2, 0, term.row-1);
 798
 799         for(y = y1; y <= y2; y++)
 800                 for(x = x1; x <= x2; x++)
 801                         term.line[y][x].state = 0;
 802 }
 803
 804 void
 805 tdeletechar(int n) {
 806         int src = term.c.x + n;
 807         int dst = term.c.x;
 808         int size = term.col - src;
 809
 810         if(src >= term.col) {
 811                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 812                 return;
 813         }
 814         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 815         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 816 }
 817
 818 void
 819 tinsertblank(int n) {
 820         int src = term.c.x;
 821         int dst = src + n;
 822         int size = term.col - dst;
 823
 824         if(dst >= term.col) {
 825                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 826                 return;
 827         }
 828         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 829         tclearregion(src, term.c.y, dst - 1, term.c.y);
 830 }
 831
 832 void
 833 tinsertblankline(int n) {
 834         if(term.c.y < term.top || term.c.y > term.bot)
 835                 return;
 836
 837         tscrolldown(term.c.y, n);
 838 }
 839
 840 void
 841 tdeleteline(int n) {
 842         if(term.c.y < term.top || term.c.y > term.bot)
 843                 return;
 844
 845         tscrollup(term.c.y, n);
 846 }
 847
 848 void
 849 tsetattr(int *attr, int l) {
 850         int i;
 851
 852         for(i = 0; i < l; i++) {
 853                 switch(attr[i]) {
 854                 case 0:
 855                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
 856                         term.c.attr.fg = DefaultFG;
 857                         term.c.attr.bg = DefaultBG;
 858                         break;
 859                 case 1:
 860                         term.c.attr.mode |= ATTR_BOLD;
 861                         break;
 862                 case 4:
 863                         term.c.attr.mode |= ATTR_UNDERLINE;
 864                         break;
 865                 case 7:
 866                         term.c.attr.mode |= ATTR_REVERSE;
 867                         break;
 868                 case 22:
 869                         term.c.attr.mode &= ~ATTR_BOLD;
 870                         break;
 871                 case 24:
 872                         term.c.attr.mode &= ~ATTR_UNDERLINE;
 873                         break;
 874                 case 27:
 875                         term.c.attr.mode &= ~ATTR_REVERSE;
 876                         break;
 877                 case 38:
 878                         if (i + 2 < l && attr[i + 1] == 5) {
 879                                 i += 2;
 880                                 if (BETWEEN(attr[i], 0, 255))
 881                                         term.c.attr.fg = attr[i];
 882                                 else
 883                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
 884                         }
 885                         else
 886                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 887                         break;
 888                 case 39:
 889                         term.c.attr.fg = DefaultFG;
 890                         break;
 891                 case 48:
 892                         if (i + 2 < l && attr[i + 1] == 5) {
 893                                 i += 2;
 894                                 if (BETWEEN(attr[i], 0, 255))
 895                                         term.c.attr.bg = attr[i];
 896                                 else
 897                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
 898                         }
 899                         else
 900                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
 901                         break;
 902                 case 49:
 903                         term.c.attr.bg = DefaultBG;
 904                         break;
 905                 default:
 906                         if(BETWEEN(attr[i], 30, 37))
 907                                 term.c.attr.fg = attr[i] - 30;
 908                         else if(BETWEEN(attr[i], 40, 47))
 909                                 term.c.attr.bg = attr[i] - 40;
 910                         else if(BETWEEN(attr[i], 90, 97))
 911                                 term.c.attr.fg = attr[i] - 90 + 8;
 912                         else if(BETWEEN(attr[i], 100, 107))
 913                                 term.c.attr.fg = attr[i] - 100 + 8;
 914                         else
 915                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]), csidump();
 916
 917                         break;
 918                 }
 919         }
 920 }
 921
 922 void
 923 tsetscroll(int t, int b) {
 924         int temp;
 925
 926         LIMIT(t, 0, term.row-1);
 927         LIMIT(b, 0, term.row-1);
 928         if(t > b) {
 929                 temp = t;
 930                 t = b;
 931                 b = temp;
 932         }
 933         term.top = t;
 934         term.bot = b;
 935 }
 936
 937 void
 938 csihandle(void) {
 939         switch(escseq.mode) {
 940         default:
 941         unknown:
 942                 fprintf(stderr, "erresc: unknown csi ");
 943                 csidump();
 944                 /* die(""); */
 945                 break;
 946         case '@': /* ICH -- Insert <n> blank char */
 947                 DEFAULT(escseq.arg[0], 1);
 948                 tinsertblank(escseq.arg[0]);
 949                 break;
 950         case 'A': /* CUU -- Cursor <n> Up */
 951         case 'e':
 952                 DEFAULT(escseq.arg[0], 1);
 953                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
 954                 break;
 955         case 'B': /* CUD -- Cursor <n> Down */
 956                 DEFAULT(escseq.arg[0], 1);
 957                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
 958                 break;
 959         case 'C': /* CUF -- Cursor <n> Forward */
 960         case 'a':
 961                 DEFAULT(escseq.arg[0], 1);
 962                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
 963                 break;
 964         case 'D': /* CUB -- Cursor <n> Backward */
 965                 DEFAULT(escseq.arg[0], 1);
 966                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
 967                 break;
 968         case 'E': /* CNL -- Cursor <n> Down and first col */
 969                 DEFAULT(escseq.arg[0], 1);
 970                 tmoveto(0, term.c.y+escseq.arg[0]);
 971                 break;
 972         case 'F': /* CPL -- Cursor <n> Up and first col */
 973                 DEFAULT(escseq.arg[0], 1);
 974                 tmoveto(0, term.c.y-escseq.arg[0]);
 975                 break;
 976         case 'G': /* CHA -- Move to <col> */
 977         case '`': /* XXX: HPA -- same? */
 978                 DEFAULT(escseq.arg[0], 1);
 979                 tmoveto(escseq.arg[0]-1, term.c.y);
 980                 break;
 981         case 'H': /* CUP -- Move to <row> <col> */
 982         case 'f': /* XXX: HVP -- same? */
 983                 DEFAULT(escseq.arg[0], 1);
 984                 DEFAULT(escseq.arg[1], 1);
 985                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
 986                 break;
 987         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
 988         case 'J': /* ED -- Clear screen */
 989                 switch(escseq.arg[0]) {
 990                 case 0: /* below */
 991                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 992                         if(term.c.y < term.row-1)
 993                                 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
 994                         break;
 995                 case 1: /* above */
 996                         if(term.c.y > 1)
 997                                 tclearregion(0, 0, term.col-1, term.c.y-1);
 998                         tclearregion(0, term.c.y, term.c.x, term.c.y);
 999                         break;
1000                 case 2: /* all */
1001                         tclearregion(0, 0, term.col-1, term.row-1);
1002                         break;
1003                 default:
1004                         goto unknown;
1005                 }
1006                 break;
1007         case 'K': /* EL -- Clear line */
1008                 switch(escseq.arg[0]) {
1009                 case 0: /* right */
1010                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1011                         break;
1012                 case 1: /* left */
1013                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1014                         break;
1015                 case 2: /* all */
1016                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1017                         break;
1018                 }
1019                 break;
1020         case 'S': /* SU -- Scroll <n> line up */
1021                 DEFAULT(escseq.arg[0], 1);
1022                 tscrollup(term.top, escseq.arg[0]);
1023                 break;
1024         case 'T': /* SD -- Scroll <n> line down */
1025                 DEFAULT(escseq.arg[0], 1);
1026                 tscrolldown(term.top, escseq.arg[0]);
1027                 break;
1028         case 'L': /* IL -- Insert <n> blank lines */
1029                 DEFAULT(escseq.arg[0], 1);
1030                 tinsertblankline(escseq.arg[0]);
1031                 break;
1032         case 'l': /* RM -- Reset Mode */
1033                 if(escseq.priv) {
1034                         switch(escseq.arg[0]) {
1035                         case 1:
1036                                 term.mode &= ~MODE_APPKEYPAD;
1037                                 break;
1038                         case 5: /* TODO: DECSCNM -- Remove reverse video */
1039                                 break;
1040                         case 7:
1041                                 term.mode &= ~MODE_WRAP;
1042                                 break;
1043                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
1044                                 break;
1045                         case 20:
1046                                 term.mode &= ~MODE_CRLF;
1047                                 break;
1048                         case 25:
1049                                 term.c.state |= CURSOR_HIDE;
1050                                 break;
1051                         case 1049: /* = 1047 and 1048 */
1052                         case 1047:
1053                                 if(IS_SET(MODE_ALTSCREEN)) {
1054                                         tclearregion(0, 0, term.col-1, term.row-1);
1055                                         tswapscreen();
1056                                 }
1057                                 if(escseq.arg[0] == 1047)
1058                                         break;
1059                         case 1048:
1060                                 tcursor(CURSOR_LOAD);
1061                                 break;
1062                         default:
1063                                 goto unknown;
1064                         }
1065                 } else {
1066                         switch(escseq.arg[0]) {
1067                         case 4:
1068                                 term.mode &= ~MODE_INSERT;
1069                                 break;
1070                         default:
1071                                 goto unknown;
1072                         }
1073                 }
1074                 break;
1075         case 'M': /* DL -- Delete <n> lines */
1076                 DEFAULT(escseq.arg[0], 1);
1077                 tdeleteline(escseq.arg[0]);
1078                 break;
1079         case 'X': /* ECH -- Erase <n> char */
1080                 DEFAULT(escseq.arg[0], 1);
1081                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
1082                 break;
1083         case 'P': /* DCH -- Delete <n> char */
1084                 DEFAULT(escseq.arg[0], 1);
1085                 tdeletechar(escseq.arg[0]);
1086                 break;
1087         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
1088         case 'd': /* VPA -- Move to <row> */
1089                 DEFAULT(escseq.arg[0], 1);
1090                 tmoveto(term.c.x, escseq.arg[0]-1);
1091                 break;
1092         case 'h': /* SM -- Set terminal mode */
1093                 if(escseq.priv) {
1094                         switch(escseq.arg[0]) {
1095                         case 1:
1096                                 term.mode |= MODE_APPKEYPAD;
1097                                 break;
1098                         case 5: /* DECSCNM -- Reverve video */
1099                                 /* TODO: set REVERSE on the whole screen (f) */
1100                                 break;
1101                         case 7:
1102                                 term.mode |= MODE_WRAP;
1103                                 break;
1104                         case 20:
1105                                 term.mode |= MODE_CRLF;
1106                                 break;
1107                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1108                                  /* fallthrough for xterm cvvis = CSI [ ? 12 ; 25 h */
1109                                 if(escseq.narg > 1 && escseq.arg[1] != 25)
1110                                         break;
1111                         case 25:
1112                                 term.c.state &= ~CURSOR_HIDE;
1113                                 break;
1114                         case 1049: /* = 1047 and 1048 */
1115                         case 1047:
1116                                 if(IS_SET(MODE_ALTSCREEN))
1117                                         tclearregion(0, 0, term.col-1, term.row-1);
1118                                 else
1119                                         tswapscreen();
1120                                 if(escseq.arg[0] == 1047)
1121                                         break;
1122                         case 1048:
1123                                 tcursor(CURSOR_SAVE);
1124                                 break;
1125                         default: goto unknown;
1126                         }
1127                 } else {
1128                         switch(escseq.arg[0]) {
1129                         case 4:
1130                                 term.mode |= MODE_INSERT;
1131                                 break;
1132                         default: goto unknown;
1133                         }
1134                 };
1135                 break;
1136         case 'm': /* SGR -- Terminal attribute (color) */
1137                 tsetattr(escseq.arg, escseq.narg);
1138                 break;
1139         case 'r': /* DECSTBM -- Set Scrolling Region */
1140                 if(escseq.priv)
1141                         goto unknown;
1142                 else {
1143                         DEFAULT(escseq.arg[0], 1);
1144                         DEFAULT(escseq.arg[1], term.row);
1145                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
1146                         tmoveto(0, 0);
1147                 }
1148                 break;
1149         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1150                 tcursor(CURSOR_SAVE);
1151                 break;
1152         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1153                 tcursor(CURSOR_LOAD);
1154                 break;
1155         }
1156 }
1157
1158 void
1159 csidump(void) {
1160         int i;
1161         printf("ESC [ %s", escseq.priv ? "? " : "");
1162         if(escseq.narg)
1163                 for(i = 0; i < escseq.narg; i++)
1164                         printf("%d ", escseq.arg[i]);
1165         if(escseq.mode)
1166                 putchar(escseq.mode);
1167         putchar('\n');
1168 }
1169
1170 void
1171 csireset(void) {
1172         memset(&escseq, 0, sizeof(escseq));
1173 }
1174
1175 void
1176 tputtab(void) {
1177         int space = TAB - term.c.x % TAB;
1178         tmoveto(term.c.x + space, term.c.y);
1179 }
1180
1181 void
1182 tputc(char *c) {
1183         char ascii = *c;
1184         if(term.esc & ESC_START) {
1185                 if(term.esc & ESC_CSI) {
1186                         escseq.buf[escseq.len++] = ascii;
1187                         if(BETWEEN(ascii, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
1188                                 term.esc = 0;
1189                                 csiparse(), csihandle();
1190                         }
1191                         /* TODO: handle other OSC */
1192                 } else if(term.esc & ESC_OSC) {
1193                         if(ascii == ';') {
1194                                 term.titlelen = 0;
1195                                 term.esc = ESC_START | ESC_TITLE;
1196                         }
1197                 } else if(term.esc & ESC_TITLE) {
1198                         if(ascii == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
1199                                 term.esc = 0;
1200                                 term.title[term.titlelen] = '\0';
1201                                 XStoreName(xw.dpy, xw.win, term.title);
1202                         } else {
1203                                 term.title[term.titlelen++] = ascii;
1204                         }
1205                 } else if(term.esc & ESC_ALTCHARSET) {
1206                         switch(ascii) {
1207                         case '0': /* Line drawing crap */
1208                                 term.c.attr.mode |= ATTR_GFX;
1209                                 break;
1210                         case 'B': /* Back to regular text */
1211                                 term.c.attr.mode &= ~ATTR_GFX;
1212                                 break;
1213                         default:
1214                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1215                         }
1216                         term.esc = 0;
1217                 } else {
1218                         switch(ascii) {
1219                         case '[':
1220                                 term.esc |= ESC_CSI;
1221                                 break;
1222                         case ']':
1223                                 term.esc |= ESC_OSC;
1224                                 break;
1225                         case '(':
1226                                 term.esc |= ESC_ALTCHARSET;
1227                                 break;
1228                         case 'D': /* IND -- Linefeed */
1229                                 if(term.c.y == term.bot)
1230                                         tscrollup(term.top, 1);
1231                                 else
1232                                         tmoveto(term.c.x, term.c.y+1);
1233                                 term.esc = 0;
1234                                 break;
1235                         case 'E': /* NEL -- Next line */
1236                                 tnewline(1); /* always go to first col */
1237                                 term.esc = 0;
1238                                 break;
1239                         case 'M': /* RI -- Reverse index */
1240                                 if(term.c.y == term.top)
1241                                         tscrolldown(term.top, 1);
1242                                 else
1243                                         tmoveto(term.c.x, term.c.y-1);
1244                                 term.esc = 0;
1245                                 break;
1246                         case 'c': /* RIS -- Reset to inital state */
1247                                 treset();
1248                                 term.esc = 0;
1249                                 break;
1250                         case '=': /* DECPAM -- Application keypad */
1251                                 term.mode |= MODE_APPKEYPAD;
1252                                 term.esc = 0;
1253                                 break;
1254                         case '>': /* DECPNM -- Normal keypad */
1255                                 term.mode &= ~MODE_APPKEYPAD;
1256                                 term.esc = 0;
1257                                 break;
1258                         case '7': /* DECSC -- Save Cursor */
1259                                 tcursor(CURSOR_SAVE);
1260                                 term.esc = 0;
1261                                 break;
1262                         case '8': /* DECRC -- Restore Cursor */
1263                                 tcursor(CURSOR_LOAD);
1264                                 term.esc = 0;
1265                                 break;
1266                         default:
1267                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1268                                     (unsigned char) ascii, isprint(ascii)?ascii:'.');
1269                                 term.esc = 0;
1270                         }
1271                 }
1272         } else {
1273                 switch(ascii) {
1274                 case '\t':
1275                         tputtab();
1276                         break;
1277                 case '\b':
1278                         tmoveto(term.c.x-1, term.c.y);
1279                         break;
1280                 case '\r':
1281                         tmoveto(0, term.c.y);
1282                         break;
1283                 case '\f':
1284                 case '\v':
1285                 case '\n':
1286                         /* go to first col if the mode is set */
1287                         tnewline(IS_SET(MODE_CRLF));
1288                         break;
1289                 case '\a':
1290                         if(!(xw.state & WIN_FOCUSED))
1291                                 xseturgency(1);
1292                         break;
1293                 case '\033':
1294                         csireset();
1295                         term.esc = ESC_START;
1296                         break;
1297                 default:
1298                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1299                                 tnewline(1); /* always go to first col */
1300                         tsetchar(c);
1301                         if(term.c.x+1 < term.col)
1302                                 tmoveto(term.c.x+1, term.c.y);
1303                         else
1304                                 term.c.state |= CURSOR_WRAPNEXT;
1305                         break;
1306                 }
1307         }
1308 }
1309
1310 int
1311 tresize(int col, int row) {
1312         int i, x;
1313         int minrow = MIN(row, term.row);
1314         int mincol = MIN(col, term.col);
1315         int slide = term.c.y - row + 1;
1316
1317         if(col < 1 || row < 1)
1318                 return 0;
1319
1320         /* free unneeded rows */
1321         i = 0;
1322         if(slide > 0) {
1323                 /* slide screen to keep cursor where we expect it -
1324                  * tscrollup would work here, but we can optimize to
1325                  * memmove because we're freeing the earlier lines */
1326                 for(/* i = 0 */; i < slide; i++) {
1327                         free(term.line[i]);
1328                         free(term.alt[i]);
1329                 }
1330                 memmove(term.line, term.line + slide, row * sizeof(Line));
1331                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1332         }
1333         for(i += row; i < term.row; i++) {
1334                 free(term.line[i]);
1335                 free(term.alt[i]);
1336         }
1337
1338         /* resize to new height */
1339         term.line = realloc(term.line, row * sizeof(Line));
1340         term.alt  = realloc(term.alt,  row * sizeof(Line));
1341
1342         /* resize each row to new width, zero-pad if needed */
1343         for(i = 0; i < minrow; i++) {
1344                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1345                 term.alt[i]  = realloc(term.alt[i],  col * sizeof(Glyph));
1346                 for(x = mincol; x < col; x++) {
1347                         term.line[i][x].state = 0;
1348                         term.alt[i][x].state = 0;
1349                 }
1350         }
1351
1352         /* allocate any new rows */
1353         for(/* i == minrow */; i < row; i++) {
1354                 term.line[i] = calloc(col, sizeof(Glyph));
1355                 term.alt [i] = calloc(col, sizeof(Glyph));
1356         }
1357
1358         /* update terminal size */
1359         term.col = col, term.row = row;
1360         /* make use of the LIMIT in tmoveto */
1361         tmoveto(term.c.x, term.c.y);
1362         /* reset scrolling region */
1363         tsetscroll(0, row-1);
1364         return (slide > 0);
1365 }
1366
1367 void
1368 xresize(int col, int row) {
1369         Pixmap newbuf;
1370         int oldw, oldh;
1371
1372         oldw = xw.bufw;
1373         oldh = xw.bufh;
1374         xw.bufw = MAX(1, col * xw.cw);
1375         xw.bufh = MAX(1, row * xw.ch);
1376         newbuf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1377         XCopyArea(xw.dpy, xw.buf, newbuf, dc.gc, 0, 0, xw.bufw, xw.bufh, 0, 0);
1378         XFreePixmap(xw.dpy, xw.buf);
1379         XSetForeground(xw.dpy, dc.gc, dc.col[DefaultBG]);
1380         if(xw.bufw > oldw)
1381                 XFillRectangle(xw.dpy, newbuf, dc.gc, oldw, 0,
1382                                 xw.bufw-oldw, MIN(xw.bufh, oldh));
1383         else if(xw.bufw < oldw && (BORDER > 0 || xw.w > xw.bufw))
1384                 XClearArea(xw.dpy, xw.win, BORDER+xw.bufw, BORDER,
1385                                 xw.w-xw.bufh-BORDER, BORDER+MIN(xw.bufh, oldh),
1386                                 False);
1387         if(xw.bufh > oldh)
1388                 XFillRectangle(xw.dpy, newbuf, dc.gc, 0, oldh,
1389                                 xw.bufw, xw.bufh-oldh);
1390         else if(xw.bufh < oldh && (BORDER > 0 || xw.h > xw.bufh))
1391                 XClearArea(xw.dpy, xw.win, BORDER, BORDER+xw.bufh,
1392                                 xw.w-2*BORDER, xw.h-xw.bufh-BORDER,
1393                                 False);
1394         xw.buf = newbuf;
1395 }
1396
1397 void
1398 xloadcols(void) {
1399         int i, r, g, b;
1400         XColor color;
1401         unsigned long white = WhitePixel(xw.dpy, xw.scr);
1402
1403         for(i = 0; i < 16; i++) {
1404                 if (!XAllocNamedColor(xw.dpy, xw.cmap, colorname[i], &color, &color)) {
1405                         dc.col[i] = white;
1406                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1407                 } else
1408                         dc.col[i] = color.pixel;
1409         }
1410
1411         /* same colors as xterm */
1412         for(r = 0; r < 6; r++)
1413                 for(g = 0; g < 6; g++)
1414                         for(b = 0; b < 6; b++) {
1415                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1416                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1417                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1418                                 if (!XAllocColor(xw.dpy, xw.cmap, &color)) {
1419                                         dc.col[i] = white;
1420                                         fprintf(stderr, "Could not allocate color %d\n", i);
1421                                 } else
1422                                         dc.col[i] = color.pixel;
1423                                 i++;
1424                         }
1425
1426         for(r = 0; r < 24; r++, i++) {
1427                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1428                 if (!XAllocColor(xw.dpy, xw.cmap, &color)) {
1429                         dc.col[i] = white;
1430                         fprintf(stderr, "Could not allocate color %d\n", i);
1431                 } else
1432                         dc.col[i] = color.pixel;
1433         }
1434 }
1435
1436 void
1437 xclear(int x1, int y1, int x2, int y2) {
1438         XSetForeground(xw.dpy, dc.gc, dc.col[DefaultBG]);
1439         XFillRectangle(xw.dpy, xw.buf, dc.gc,
1440                        x1 * xw.cw, y1 * xw.ch,
1441                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1442 }
1443
1444 void
1445 xhints(void)
1446 {
1447         XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
1448         XWMHints wm = {.flags = InputHint, .input = 1};
1449         XSizeHints size = {
1450                 .flags = PSize | PResizeInc | PBaseSize,
1451                 .height = xw.h,
1452                 .width = xw.w,
1453                 .height_inc = xw.ch,
1454                 .width_inc = xw.cw,
1455                 .base_height = 2*BORDER,
1456                 .base_width = 2*BORDER,
1457         };
1458         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1459 }
1460
1461 XFontSet
1462 xinitfont(char *fontstr)
1463 {
1464         XFontSet set;
1465         char *def, **missing;
1466         int n;
1467
1468         missing = NULL;
1469         set = XCreateFontSet(xw.dpy, fontstr, &missing, &n, &def);
1470         if(missing) {
1471                 while(n--)
1472                         fprintf(stderr, "st: missing fontset: %s\n", missing[n]);
1473                 XFreeStringList(missing);
1474         }
1475         return set;
1476 }
1477
1478 void
1479 xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rbearing)
1480 {
1481         XFontStruct **xfonts;
1482         char **font_names;
1483         int i, n;
1484
1485         *ascent = *descent = *lbearing = *rbearing = 0;
1486         n = XFontsOfFontSet(set, &xfonts, &font_names);
1487         for(i = 0; i < n; i++) {
1488                 *ascent = MAX(*ascent, (*xfonts)->ascent);
1489                 *descent = MAX(*descent, (*xfonts)->descent);
1490                 *lbearing = MAX(*lbearing, (*xfonts)->min_bounds.lbearing);
1491                 *rbearing = MAX(*rbearing, (*xfonts)->max_bounds.rbearing);
1492                 xfonts++;
1493         }
1494 }
1495
1496 void
1497 initfonts(char *fontstr, char *bfontstr)
1498 {
1499         if((dc.font.set = xinitfont(fontstr)) == NULL ||
1500            (dc.bfont.set = xinitfont(bfontstr)) == NULL)
1501                 die("Can't load font %s\n", dc.font.set ? BOLDFONT : FONT);
1502         xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1503             &dc.font.lbearing, &dc.font.rbearing);
1504         xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1505             &dc.bfont.lbearing, &dc.bfont.rbearing);
1506 }
1507
1508 void
1509 xinit(void) {
1510         XSetWindowAttributes attrs;
1511         Cursor cursor;
1512
1513         if(!(xw.dpy = XOpenDisplay(NULL)))
1514                 die("Can't open display\n");
1515         xw.scr = XDefaultScreen(xw.dpy);
1516
1517         /* font */
1518         initfonts(FONT, BOLDFONT);
1519
1520         /* XXX: Assuming same size for bold font */
1521         xw.cw = dc.font.rbearing - dc.font.lbearing;
1522         xw.ch = dc.font.ascent + dc.font.descent;
1523
1524         /* colors */
1525         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1526         xloadcols();
1527
1528         /* window - default size */
1529         xw.bufh = 24 * xw.ch;
1530         xw.bufw = 80 * xw.cw;
1531         xw.h = xw.bufh + 2*BORDER;
1532         xw.w = xw.bufw + 2*BORDER;
1533
1534         attrs.background_pixel = dc.col[DefaultBG];
1535         attrs.border_pixel = dc.col[DefaultBG];
1536         attrs.bit_gravity = NorthWestGravity;
1537         attrs.event_mask = FocusChangeMask | KeyPressMask
1538                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1539                 | PointerMotionMask | ButtonPressMask | ButtonReleaseMask;
1540         attrs.colormap = xw.cmap;
1541
1542         xw.win = XCreateWindow(xw.dpy, XRootWindow(xw.dpy, xw.scr), 0, 0,
1543                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
1544                         XDefaultVisual(xw.dpy, xw.scr),
1545                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1546                         | CWColormap,
1547                         &attrs);
1548         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1549
1550
1551         /* input methods */
1552         xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
1553         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1554                                            | XIMStatusNothing, XNClientWindow, xw.win,
1555                                            XNFocusWindow, xw.win, NULL);
1556         /* gc */
1557         dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
1558
1559         /* white cursor, black outline */
1560         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
1561         XDefineCursor(xw.dpy, xw.win, cursor);
1562         XRecolorCursor(xw.dpy, cursor,
1563                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
1564                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
1565
1566         XMapWindow(xw.dpy, xw.win);
1567         xhints();
1568         XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
1569         XSync(xw.dpy, 0);
1570 }
1571
1572 void
1573 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
1574         unsigned long xfg, xbg;
1575         int winx = x*xw.cw, winy = y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
1576         int i;
1577
1578         if(base.mode & ATTR_REVERSE)
1579                 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1580         else
1581                 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1582
1583         XSetBackground(xw.dpy, dc.gc, xbg);
1584         XSetForeground(xw.dpy, dc.gc, xfg);
1585
1586         if(base.mode & ATTR_GFX) {
1587                 for(i = 0; i < bytelen; i++) {
1588                         char c = gfx[(unsigned int)s[i] % 256];
1589                         if(c)
1590                                 s[i] = c;
1591                         else if(s[i] > 0x5f)
1592                                 s[i] -= 0x5f;
1593                 }
1594         }
1595
1596         XmbDrawImageString(xw.dpy, xw.buf, base.mode & ATTR_BOLD ? dc.bfont.set : dc.font.set,
1597             dc.gc, winx, winy, s, bytelen);
1598
1599         if(base.mode & ATTR_UNDERLINE)
1600                 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1601 }
1602
1603 void
1604 xdrawcursor(void) {
1605         static int oldx = 0;
1606         static int oldy = 0;
1607         int sl;
1608         Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
1609
1610         LIMIT(oldx, 0, term.col-1);
1611         LIMIT(oldy, 0, term.row-1);
1612
1613         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1614                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
1615
1616         /* remove the old cursor */
1617         if(term.line[oldy][oldx].state & GLYPH_SET) {
1618                 sl = utf8size(term.line[oldy][oldx].c);
1619                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
1620         } else
1621                 xclear(oldx, oldy, oldx, oldy);
1622
1623         /* draw the new one */
1624         if(!(term.c.state & CURSOR_HIDE) && (xw.state & WIN_FOCUSED)) {
1625                 sl = utf8size(g.c);
1626                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
1627                 oldx = term.c.x, oldy = term.c.y;
1628         }
1629 }
1630
1631 #ifdef DEBUG
1632 /* basic drawing routines */
1633 void
1634 xdrawc(int x, int y, Glyph g) {
1635         int sl = utf8size(g.c);
1636         XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1637         XSetBackground(xw.dpy, dc.gc, dc.col[g.bg]);
1638         XSetForeground(xw.dpy, dc.gc, dc.col[g.fg]);
1639         XmbDrawImageString(xw.dpy, xw.buf, g.mode&ATTR_BOLD?dc.bfont.fs:dc.font.fs,
1640             dc.gc, r.x, r.y+dc.font.ascent, g.c, sl);
1641 }
1642
1643 void
1644 draw(int dummy) {
1645         int x, y;
1646
1647         xclear(0, 0, term.col-1, term.row-1);
1648         for(y = 0; y < term.row; y++)
1649                 for(x = 0; x < term.col; x++)
1650                         if(term.line[y][x].state & GLYPH_SET)
1651                                 xdrawc(x, y, term.line[y][x]);
1652
1653         xdrawcursor();
1654         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1655         XFlush(xw.dpy);
1656 }
1657
1658 #else
1659 /* optimized drawing routine */
1660 void
1661 draw(int redraw_all) {
1662         int ic, ib, x, y, ox, sl;
1663         Glyph base, new;
1664         char buf[DRAW_BUF_SIZ];
1665
1666         if(!(xw.state & WIN_VISIBLE))
1667                 return;
1668
1669         xclear(0, 0, term.col-1, term.row-1);
1670         for(y = 0; y < term.row; y++) {
1671                 base = term.line[y][0];
1672                 ic = ib = ox = 0;
1673                 for(x = 0; x < term.col; x++) {
1674                         new = term.line[y][x];
1675                         if(sel.bx!=-1 && *(new.c) && selected(x, y))
1676                                 new.mode ^= ATTR_REVERSE;
1677                         if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1678                                         ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
1679                                 xdraws(buf, base, ox, y, ic, ib);
1680                                 ic = ib = 0;
1681                         }
1682                         if(new.state & GLYPH_SET) {
1683                                 if(ib == 0) {
1684                                         ox = x;
1685                                         base = new;
1686                                 }
1687                                 sl = utf8size(new.c);
1688                                 memcpy(buf+ib, new.c, sl);
1689                                 ib += sl;
1690                                 ++ic;
1691                         }
1692                 }
1693                 if(ib > 0)
1694                         xdraws(buf, base, ox, y, ic, ib);
1695         }
1696         xdrawcursor();
1697         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1698 }
1699
1700 #endif
1701
1702 void
1703 expose(XEvent *ev) {
1704         XExposeEvent *e = &ev->xexpose;
1705         if(xw.state & WIN_REDRAW) {
1706                 if(!e->count) {
1707                         xw.state &= ~WIN_REDRAW;
1708                         draw(SCREEN_REDRAW);
1709                 }
1710         } else
1711                 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, e->x-BORDER, e->y-BORDER,
1712                                 e->width, e->height, e->x, e->y);
1713 }
1714
1715 void
1716 visibility(XEvent *ev) {
1717         XVisibilityEvent *e = &ev->xvisibility;
1718         if(e->state == VisibilityFullyObscured)
1719                 xw.state &= ~WIN_VISIBLE;
1720         else if(!(xw.state & WIN_VISIBLE))
1721                 /* need a full redraw for next Expose, not just a buf copy */
1722                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
1723 }
1724
1725 void
1726 unmap(XEvent *ev) {
1727         xw.state &= ~WIN_VISIBLE;
1728 }
1729
1730 void
1731 xseturgency(int add) {
1732         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
1733         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1734         XSetWMHints(xw.dpy, xw.win, h);
1735         XFree(h);
1736 }
1737
1738 void
1739 focus(XEvent *ev) {
1740         if(ev->type == FocusIn) {
1741                 xw.state |= WIN_FOCUSED;
1742                 xseturgency(0);
1743         } else
1744                 xw.state &= ~WIN_FOCUSED;
1745         draw(SCREEN_UPDATE);
1746 }
1747
1748 char*
1749 kmap(KeySym k) {
1750         int i;
1751         for(i = 0; i < LEN(key); i++)
1752                 if(key[i].k == k)
1753                         return (char*)key[i].s;
1754         return NULL;
1755 }
1756
1757 void
1758 kpress(XEvent *ev) {
1759         XKeyEvent *e = &ev->xkey;
1760         KeySym ksym;
1761         char buf[32];
1762         char *customkey;
1763         int len;
1764         int meta;
1765         int shift;
1766         Status status;
1767
1768         meta = e->state & Mod1Mask;
1769         shift = e->state & ShiftMask;
1770         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
1771
1772         /* 1. custom keys from config.h */
1773         if((customkey = kmap(ksym)))
1774                 ttywrite(customkey, strlen(customkey));
1775         /* 2. hardcoded (overrides X lookup) */
1776         else
1777                 switch(ksym) {
1778                 case XK_Up:
1779                 case XK_Down:
1780                 case XK_Left:
1781                 case XK_Right:
1782                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1783                         ttywrite(buf, 3);
1784                         break;
1785                 case XK_Insert:
1786                         if(shift)
1787                                 selpaste();
1788                         break;
1789                 case XK_Return:
1790                         if(IS_SET(MODE_CRLF))
1791                                 ttywrite("\r\n", 2);
1792                         else
1793                                 ttywrite("\r", 1);
1794                         break;
1795                         /* 3. X lookup  */
1796                 default:
1797                         if(len > 0) {
1798                                 if(meta && len == 1)
1799                                         ttywrite("\033", 1);
1800                                 ttywrite(buf, len);
1801                         }
1802                         break;
1803                 }
1804 }
1805
1806 void
1807 resize(XEvent *e) {
1808         int col, row;
1809
1810         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1811                 return;
1812
1813         xw.w = e->xconfigure.width;
1814         xw.h = e->xconfigure.height;
1815         col = (xw.w - 2*BORDER) / xw.cw;
1816         row = (xw.h - 2*BORDER) / xw.ch;
1817         if(col == term.col && row == term.row)
1818                 return;
1819         if(tresize(col, row))
1820                 draw(SCREEN_REDRAW);
1821         ttyresize(col, row);
1822         xresize(col, row);
1823 }
1824
1825 void
1826 run(void) {
1827         XEvent ev;
1828         fd_set rfd;
1829         int xfd = XConnectionNumber(xw.dpy);
1830
1831         for(;;) {
1832                 FD_ZERO(&rfd);
1833                 FD_SET(cmdfd, &rfd);
1834                 FD_SET(xfd, &rfd);
1835                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1836                         if(errno == EINTR)
1837                                 continue;
1838                         die("select failed: %s\n", SERRNO);
1839                 }
1840                 if(FD_ISSET(cmdfd, &rfd)) {
1841                         ttyread();
1842                         draw(SCREEN_UPDATE);
1843                 }
1844                 while(XPending(xw.dpy)) {
1845                         XNextEvent(xw.dpy, &ev);
1846                         if (XFilterEvent(&ev, xw.win))
1847                                 continue;
1848                         if(handler[ev.type])
1849                                 (handler[ev.type])(&ev);
1850                 }
1851         }
1852 }
1853
1854 int
1855 main(int argc, char *argv[]) {
1856         int i;
1857
1858         for(i = 1; i < argc; i++) {
1859                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
1860                 case 't':
1861                         if(++i < argc) opt_title = argv[i];
1862                         break;
1863                 case 'c':
1864                         if(++i < argc) opt_class = argv[i];
1865                         break;
1866                 case 'e':
1867                         if(++i < argc) opt_cmd = &argv[i];
1868                         break;
1869                 case 'v':
1870                 default:
1871                         die(USAGE);
1872                 }
1873                 /* -e eats every remaining arguments */
1874                 if(opt_cmd)
1875                         break;
1876         }
1877         setlocale(LC_CTYPE, "");
1878         tnew(80, 24);
1879         ttynew();
1880         xinit();
1881         selinit();
1882         run();
1883         return 0;
1884 }