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 #include <sys/time.h>
  26 #include <time.h>
  27
  28 #if   defined(__linux)
  29  #include <pty.h>
  30 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  31  #include <util.h>
  32 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  33  #include <libutil.h>
  34 #endif
  35
  36 #define USAGE \
  37         "st " VERSION " (c) 2010-2011 st engineers\n" \
  38         "usage: st [-t title] [-c class] [-w windowid] [-v] [-e command...]\n"
  39
  40 /* XEMBED messages */
  41 #define XEMBED_FOCUS_IN  4
  42 #define XEMBED_FOCUS_OUT 5
  43
  44 /* Arbitrary sizes */
  45 #define ESC_TITLE_SIZ 256
  46 #define ESC_BUF_SIZ   256
  47 #define ESC_ARG_SIZ   16
  48 #define DRAW_BUF_SIZ  1024
  49 #define UTF_SIZ       4
  50 #define XK_NO_MOD     UINT_MAX
  51 #define XK_ANY_MOD    0
  52
  53 #define SERRNO strerror(errno)
  54 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  55 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  56 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  57 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  58 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  59 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  60 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  61 #define IS_SET(flag) (term.mode & (flag))
  62 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  63 #define X2COL(x) (((x) - BORDER)/xw.cw)
  64 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
  65
  66 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
  67 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
  68 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
  69        CURSOR_SAVE, CURSOR_LOAD };
  70 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
  71 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
  72 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8,
  73        MODE_CRLF=16, MODE_MOUSEBTN=32, MODE_MOUSEMOTION=64, MODE_MOUSE=32|64, MODE_REVERSE=128 };
  74 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
  75 enum { WIN_VISIBLE=1, WIN_REDRAW=2, WIN_FOCUSED=4 };
  76
  77 #undef B0
  78 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
  79
  80 typedef struct {
  81         char c[UTF_SIZ];     /* character code */
  82         char mode;  /* attribute flags */
  83         int fg;     /* foreground      */
  84         int bg;     /* background      */
  85         char state; /* state flags     */
  86 } Glyph;
  87
  88 typedef Glyph* Line;
  89
  90 typedef struct {
  91         Glyph attr;      /* current char attributes */
  92         int x;
  93         int y;
  94         char state;
  95 } TCursor;
  96
  97 /* CSI Escape sequence structs */
  98 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
  99 typedef struct {
 100         char buf[ESC_BUF_SIZ]; /* raw string */
 101         int len;               /* raw string length */
 102         char priv;
 103         int arg[ESC_ARG_SIZ];
 104         int narg;              /* nb of args */
 105         char mode;
 106 } CSIEscape;
 107
 108 /* Internal representation of the screen */
 109 typedef struct {
 110         int row;        /* nb row */
 111         int col;        /* nb col */
 112         Line* line;     /* screen */
 113         Line* alt;      /* alternate screen */
 114         char* dirty; /* dirtyness of lines */
 115         TCursor c;      /* cursor */
 116         int top;        /* top    scroll limit */
 117         int bot;        /* bottom scroll limit */
 118         int mode;       /* terminal mode flags */
 119         int esc;        /* escape state flags */
 120         char title[ESC_TITLE_SIZ];
 121         int titlelen;
 122 } Term;
 123
 124 /* Purely graphic info */
 125 typedef struct {
 126         Display* dpy;
 127         Colormap cmap;
 128         Window win;
 129         Pixmap buf;
 130         Atom xembed;
 131         XIM xim;
 132         XIC xic;
 133         int scr;
 134         int w;  /* window width */
 135         int h;  /* window height */
 136         int bufw; /* pixmap width  */
 137         int bufh; /* pixmap height */
 138         int ch; /* char height */
 139         int cw; /* char width  */
 140         char state; /* focus, redraw, visible */
 141 } XWindow;
 142
 143 typedef struct {
 144         KeySym k;
 145         unsigned int mask;
 146         char s[ESC_BUF_SIZ];
 147 } Key;
 148
 149 /* Drawing Context */
 150 typedef struct {
 151         unsigned long col[256];
 152         GC gc;
 153         struct {
 154                 int ascent;
 155                 int descent;
 156                 short lbearing;
 157                 short rbearing;
 158                 XFontSet set;
 159         } font, bfont;
 160 } DC;
 161
 162 /* TODO: use better name for vars... */
 163 typedef struct {
 164         int mode;
 165         int bx, by;
 166         int ex, ey;
 167         struct {int x, y;} b, e;
 168         char *clip;
 169         Atom xtarget;
 170         struct timeval tclick1;
 171         struct timeval tclick2;
 172 } Selection;
 173
 174 #include "config.h"
 175
 176 static void die(const char*, ...);
 177 static void draw(void);
 178 static void drawregion(int, int, int, int);
 179 static void execsh(void);
 180 static void sigchld(int);
 181 static void run(void);
 182
 183 static void csidump(void);
 184 static void csihandle(void);
 185 static void csiparse(void);
 186 static void csireset(void);
 187
 188 static void tclearregion(int, int, int, int);
 189 static void tcursor(int);
 190 static void tdeletechar(int);
 191 static void tdeleteline(int);
 192 static void tinsertblank(int);
 193 static void tinsertblankline(int);
 194 static void tmoveto(int, int);
 195 static void tnew(int, int);
 196 static void tnewline(int);
 197 static void tputtab(void);
 198 static void tputc(char*);
 199 static void treset(void);
 200 static int tresize(int, int);
 201 static void tscrollup(int, int);
 202 static void tscrolldown(int, int);
 203 static void tsetattr(int*, int);
 204 static void tsetchar(char*);
 205 static void tsetscroll(int, int);
 206 static void tswapscreen(void);
 207 static void tfulldirt(void);
 208
 209 static void ttynew(void);
 210 static void ttyread(void);
 211 static void ttyresize(int, int);
 212 static void ttywrite(const char *, size_t);
 213
 214 static void xdraws(char *, Glyph, int, int, int, int);
 215 static void xhints(void);
 216 static void xclear(int, int, int, int);
 217 static void xdrawcursor(void);
 218 static void xinit(void);
 219 static void xloadcols(void);
 220 static void xseturgency(int);
 221 static void xsetsel(char*);
 222 static void xresize(int, int);
 223
 224 static void expose(XEvent *);
 225 static void visibility(XEvent *);
 226 static void unmap(XEvent *);
 227 static char* kmap(KeySym, unsigned int state);
 228 static void kpress(XEvent *);
 229 static void cmessage(XEvent *);
 230 static void resize(XEvent *);
 231 static void focus(XEvent *);
 232 static void brelease(XEvent *);
 233 static void bpress(XEvent *);
 234 static void bmotion(XEvent *);
 235 static void selnotify(XEvent *);
 236 static void selrequest(XEvent *);
 237
 238 static void selinit(void);
 239 static inline int selected(int, int);
 240 static void selcopy(void);
 241 static void selpaste();
 242 static void selscroll(int, int);
 243
 244 static int utf8decode(char *, long *);
 245 static int utf8encode(long *, char *);
 246 static int utf8size(char *);
 247 static int isfullutf8(char *, int);
 248
 249 static void (*handler[LASTEvent])(XEvent *) = {
 250         [KeyPress] = kpress,
 251         [ClientMessage] = cmessage,
 252         [ConfigureNotify] = resize,
 253         [VisibilityNotify] = visibility,
 254         [UnmapNotify] = unmap,
 255         [Expose] = expose,
 256         [FocusIn] = focus,
 257         [FocusOut] = focus,
 258         [MotionNotify] = bmotion,
 259         [ButtonPress] = bpress,
 260         [ButtonRelease] = brelease,
 261         [SelectionNotify] = selnotify,
 262         [SelectionRequest] = selrequest,
 263 };
 264
 265 /* Globals */
 266 static DC dc;
 267 static XWindow xw;
 268 static Term term;
 269 static CSIEscape escseq;
 270 static int cmdfd;
 271 static pid_t pid;
 272 static Selection sel;
 273 static char **opt_cmd  = NULL;
 274 static char *opt_title = NULL;
 275 static char *opt_embed = NULL;
 276 static char *opt_class = NULL;
 277
 278 int
 279 utf8decode(char *s, long *u) {
 280         unsigned char c;
 281         int i, n, rtn;
 282
 283         rtn = 1;
 284         c = *s;
 285         if(~c&B7) { /* 0xxxxxxx */
 286                 *u = c;
 287                 return rtn;
 288         } else if((c&(B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 289                 *u = c&(B4|B3|B2|B1|B0);
 290                 n = 1;
 291         } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 292                 *u = c&(B3|B2|B1|B0);
 293                 n = 2;
 294         } else if((c&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 295                 *u = c&(B2|B1|B0);
 296                 n = 3;
 297         } else
 298                 goto invalid;
 299         for(i=n,++s; i>0; --i,++rtn,++s) {
 300                 c = *s;
 301                 if((c&(B7|B6)) != B7) /* 10xxxxxx */
 302                         goto invalid;
 303                 *u <<= 6;
 304                 *u |= c&(B5|B4|B3|B2|B1|B0);
 305         }
 306         if((n == 1 && *u < 0x80) ||
 307            (n == 2 && *u < 0x800) ||
 308            (n == 3 && *u < 0x10000) ||
 309            (*u >= 0xD800 && *u <= 0xDFFF))
 310                 goto invalid;
 311         return rtn;
 312 invalid:
 313         *u = 0xFFFD;
 314         return rtn;
 315 }
 316
 317 int
 318 utf8encode(long *u, char *s) {
 319         unsigned char *sp;
 320         unsigned long uc;
 321         int i, n;
 322
 323         sp = (unsigned char*) s;
 324         uc = *u;
 325         if(uc < 0x80) {
 326                 *sp = uc; /* 0xxxxxxx */
 327                 return 1;
 328         } else if(*u < 0x800) {
 329                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 330                 n = 1;
 331         } else if(uc < 0x10000) {
 332                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 333                 n = 2;
 334         } else if(uc <= 0x10FFFF) {
 335                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 336                 n = 3;
 337         } else {
 338                 goto invalid;
 339         }
 340         for(i=n,++sp; i>0; --i,++sp)
 341                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 342         return n+1;
 343 invalid:
 344         /* U+FFFD */
 345         *s++ = '\xEF';
 346         *s++ = '\xBF';
 347         *s = '\xBD';
 348         return 3;
 349 }
 350
 351 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 352    UTF-8 otherwise return 0 */
 353 int
 354 isfullutf8(char *s, int b) {
 355         unsigned char *c1, *c2, *c3;
 356
 357         c1 = (unsigned char *) s;
 358         c2 = (unsigned char *) ++s;
 359         c3 = (unsigned char *) ++s;
 360         if(b < 1)
 361                 return 0;
 362         else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
 363                 return 0;
 364         else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 365             ((b == 1) ||
 366             ((b == 2) && (*c2&(B7|B6)) == B7)))
 367                 return 0;
 368         else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 369             ((b == 1) ||
 370             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 371             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
 372                 return 0;
 373         else
 374                 return 1;
 375 }
 376
 377 int
 378 utf8size(char *s) {
 379         unsigned char c = *s;
 380
 381         if(~c&B7)
 382                 return 1;
 383         else if((c&(B7|B6|B5)) == (B7|B6))
 384                 return 2;
 385         else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
 386                 return 3;
 387         else
 388                 return 4;
 389 }
 390
 391 void
 392 selinit(void) {
 393         sel.tclick1.tv_sec = 0;
 394         sel.tclick1.tv_usec = 0;
 395         sel.mode = 0;
 396         sel.bx = -1;
 397         sel.clip = NULL;
 398         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 399         if(sel.xtarget == None)
 400                 sel.xtarget = XA_STRING;
 401 }
 402
 403 static inline int
 404 selected(int x, int y) {
 405         if(sel.ey == y && sel.by == y) {
 406                 int bx = MIN(sel.bx, sel.ex);
 407                 int ex = MAX(sel.bx, sel.ex);
 408                 return BETWEEN(x, bx, ex);
 409         }
 410         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 411                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 412 }
 413
 414 void
 415 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 416         if(b)
 417                 *b = e->xbutton.button;
 418
 419         *x = X2COL(e->xbutton.x);
 420         *y = Y2ROW(e->xbutton.y);
 421         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 422         sel.b.y = MIN(sel.by, sel.ey);
 423         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 424         sel.e.y = MAX(sel.by, sel.ey);
 425 }
 426
 427 void
 428 mousereport(XEvent *e) {
 429         int x = X2COL(e->xbutton.x);
 430         int y = Y2ROW(e->xbutton.y);
 431         int button = e->xbutton.button;
 432         int state = e->xbutton.state;
 433         char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
 434         static int ob, ox, oy;
 435
 436         /* from urxvt */
 437         if(e->xbutton.type == MotionNotify) {
 438                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 439                         return;
 440                 button = ob + 32;
 441                 ox = x, oy = y;
 442         } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
 443                 button = 3;
 444         } else {
 445                 button -= Button1;
 446                 if(button >= 3)
 447                         button += 64 - 3;
 448                 if(e->xbutton.type == ButtonPress) {
 449                         ob = button;
 450                         ox = x, oy = y;
 451                 }
 452         }
 453
 454         buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
 455                 + (state & Mod4Mask    ? 8  : 0)
 456                 + (state & ControlMask ? 16 : 0);
 457
 458         ttywrite(buf, sizeof(buf));
 459 }
 460
 461 void
 462 bpress(XEvent *e) {
 463         if(IS_SET(MODE_MOUSE))
 464                 mousereport(e);
 465         else if(e->xbutton.button == Button1) {
 466                 if(sel.bx != -1)
 467                         for(int i=sel.b.y; i<=sel.e.y; i++)
 468                                 term.dirty[i] = 1;
 469                 sel.mode = 1;
 470                 sel.ex = sel.bx = X2COL(e->xbutton.x);
 471                 sel.ey = sel.by = Y2ROW(e->xbutton.y);
 472         }
 473 }
 474
 475 void
 476 selcopy(void) {
 477         char *str, *ptr;
 478         int x, y, sz, sl, ls = 0;
 479
 480         if(sel.bx == -1)
 481                 str = NULL;
 482         else {
 483                 sz = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 484                 ptr = str = malloc(sz);
 485                 for(y = 0; y < term.row; y++) {
 486                         for(x = 0; x < term.col; x++)
 487                                 if(term.line[y][x].state & GLYPH_SET && (ls = selected(x, y))) {
 488                                         sl = utf8size(term.line[y][x].c);
 489                                         memcpy(ptr, term.line[y][x].c, sl);
 490                                         ptr += sl;
 491                                 }
 492                         if(ls && y < sel.e.y)
 493                                 *ptr++ = '\n';
 494                 }
 495                 *ptr = 0;
 496         }
 497         xsetsel(str);
 498 }
 499
 500 void
 501 selnotify(XEvent *e) {
 502         unsigned long nitems, ofs, rem;
 503         int format;
 504         unsigned char *data;
 505         Atom type;
 506
 507         ofs = 0;
 508         do {
 509                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 510                                         False, AnyPropertyType, &type, &format,
 511                                         &nitems, &rem, &data)) {
 512                         fprintf(stderr, "Clipboard allocation failed\n");
 513                         return;
 514                 }
 515                 ttywrite((const char *) data, nitems * format / 8);
 516                 XFree(data);
 517                 /* number of 32-bit chunks returned */
 518                 ofs += nitems * format / 32;
 519         } while(rem > 0);
 520 }
 521
 522 void
 523 selpaste() {
 524         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
 525 }
 526
 527 void
 528 selrequest(XEvent *e) {
 529         XSelectionRequestEvent *xsre;
 530         XSelectionEvent xev;
 531         Atom xa_targets;
 532
 533         xsre = (XSelectionRequestEvent *) e;
 534         xev.type = SelectionNotify;
 535         xev.requestor = xsre->requestor;
 536         xev.selection = xsre->selection;
 537         xev.target = xsre->target;
 538         xev.time = xsre->time;
 539         /* reject */
 540         xev.property = None;
 541
 542         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 543         if(xsre->target == xa_targets) {
 544                 /* respond with the supported type */
 545                 Atom string = sel.xtarget;
 546                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 547                                 XA_ATOM, 32, PropModeReplace,
 548                                 (unsigned char *) &string, 1);
 549                 xev.property = xsre->property;
 550         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 551                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 552                                 xsre->target, 8, PropModeReplace,
 553                                 (unsigned char *) sel.clip, strlen(sel.clip));
 554                 xev.property = xsre->property;
 555         }
 556
 557         /* all done, send a notification to the listener */
 558         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 559                 fprintf(stderr, "Error sending SelectionNotify event\n");
 560 }
 561
 562 void
 563 xsetsel(char *str) {
 564         /* register the selection for both the clipboard and the primary */
 565         Atom clipboard;
 566
 567         free(sel.clip);
 568         sel.clip = str;
 569
 570         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 571
 572         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 573         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 574
 575         XFlush(xw.dpy);
 576 }
 577
 578 void
 579 brelease(XEvent *e) {
 580         if(IS_SET(MODE_MOUSE)) {
 581                 mousereport(e);
 582                 return;
 583         }
 584         if(e->xbutton.button == Button2)
 585                 selpaste();
 586         else if(e->xbutton.button == Button1) {
 587                 sel.mode = 0;
 588                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 589                 term.dirty[sel.ey] = 1;
 590                 if(sel.bx == sel.ex && sel.by == sel.ey) {
 591                         struct timeval now;
 592                         sel.bx = -1;
 593                         gettimeofday(&now, NULL);
 594
 595                         if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
 596                                 /* triple click on the line */
 597                                 sel.b.x = sel.bx = 0;
 598                                 sel.e.x = sel.ex = term.col;
 599                                 sel.b.y = sel.e.y = sel.ey;
 600                                 selcopy();
 601                         } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
 602                                 /* double click to select word */
 603                                 sel.bx = sel.ex;
 604                                 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
 605                                           term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
 606                                 sel.b.x = sel.bx;
 607                                 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
 608                                           term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
 609                                 sel.e.x = sel.ex;
 610                                 sel.b.y = sel.e.y = sel.ey;
 611                                 selcopy();
 612                         }
 613                 } else
 614                         selcopy();
 615         }
 616         memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
 617         gettimeofday(&sel.tclick1, NULL);
 618         draw();
 619 }
 620
 621 void
 622 bmotion(XEvent *e) {
 623         if(IS_SET(MODE_MOUSE)) {
 624                 mousereport(e);
 625                 return;
 626         }
 627         if(sel.mode) {
 628                 int oldey = sel.ey, oldex = sel.ex;
 629                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 630
 631                 if(oldey != sel.ey || oldex != sel.ex) {
 632                         int starty = MIN(oldey, sel.ey);
 633                         int endy = MAX(oldey, sel.ey);
 634                         for(int i=starty; i<=endy; i++)
 635                                 term.dirty[i] = 1;
 636                         draw();
 637                 }
 638         }
 639 }
 640
 641 void
 642 die(const char *errstr, ...) {
 643         va_list ap;
 644
 645         va_start(ap, errstr);
 646         vfprintf(stderr, errstr, ap);
 647         va_end(ap);
 648         exit(EXIT_FAILURE);
 649 }
 650
 651 void
 652 execsh(void) {
 653         char **args;
 654         char *envshell = getenv("SHELL");
 655
 656         DEFAULT(envshell, "sh");
 657         putenv("TERM="TNAME);
 658         args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
 659         execvp(args[0], args);
 660         exit(EXIT_FAILURE);
 661 }
 662
 663 void
 664 sigchld(int a) {
 665         int stat = 0;
 666         if(waitpid(pid, &stat, 0) < 0)
 667                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 668         if(WIFEXITED(stat))
 669                 exit(WEXITSTATUS(stat));
 670         else
 671                 exit(EXIT_FAILURE);
 672 }
 673
 674 void
 675 ttynew(void) {
 676         int m, s;
 677
 678         /* seems to work fine on linux, openbsd and freebsd */
 679         struct winsize w = {term.row, term.col, 0, 0};
 680         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 681                 die("openpty failed: %s\n", SERRNO);
 682
 683         switch(pid = fork()) {
 684         case -1:
 685                 die("fork failed\n");
 686                 break;
 687         case 0:
 688                 setsid(); /* create a new process group */
 689                 dup2(s, STDIN_FILENO);
 690                 dup2(s, STDOUT_FILENO);
 691                 dup2(s, STDERR_FILENO);
 692                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 693                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 694                 close(s);
 695                 close(m);
 696                 execsh();
 697                 break;
 698         default:
 699                 close(s);
 700                 cmdfd = m;
 701                 signal(SIGCHLD, sigchld);
 702         }
 703 }
 704
 705 void
 706 dump(char c) {
 707         static int col;
 708         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 709         if(++col % 10 == 0)
 710                 fprintf(stderr, "\n");
 711 }
 712
 713 void
 714 ttyread(void) {
 715         static char buf[BUFSIZ];
 716         static int buflen = 0;
 717         char *ptr;
 718         char s[UTF_SIZ];
 719         int charsize; /* size of utf8 char in bytes */
 720         long utf8c;
 721         int ret;
 722
 723         /* append read bytes to unprocessed bytes */
 724         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
 725                 die("Couldn't read from shell: %s\n", SERRNO);
 726
 727         /* process every complete utf8 char */
 728         buflen += ret;
 729         ptr = buf;
 730         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
 731                 charsize = utf8decode(ptr, &utf8c);
 732                 utf8encode(&utf8c, s);
 733                 tputc(s);
 734                 ptr    += charsize;
 735                 buflen -= charsize;
 736         }
 737
 738         /* keep any uncomplete utf8 char for the next call */
 739         memmove(buf, ptr, buflen);
 740 }
 741
 742 void
 743 ttywrite(const char *s, size_t n) {
 744         if(write(cmdfd, s, n) == -1)
 745                 die("write error on tty: %s\n", SERRNO);
 746 }
 747
 748 void
 749 ttyresize(int x, int y) {
 750         struct winsize w;
 751
 752         w.ws_row = term.row;
 753         w.ws_col = term.col;
 754         w.ws_xpixel = w.ws_ypixel = 0;
 755         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 756                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 757 }
 758
 759 void
 760 tfulldirt(void)
 761 {
 762         int i;
 763         for(i = 0; i < term.row; i++)
 764                 term.dirty[i] = 1;
 765 }
 766
 767 void
 768 tcursor(int mode) {
 769         static TCursor c;
 770
 771         if(mode == CURSOR_SAVE)
 772                 c = term.c;
 773         else if(mode == CURSOR_LOAD)
 774                 term.c = c, tmoveto(c.x, c.y);
 775 }
 776
 777 void
 778 treset(void) {
 779         term.c = (TCursor){{
 780                 .mode = ATTR_NULL,
 781                 .fg = DefaultFG,
 782                 .bg = DefaultBG
 783         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 784
 785         term.top = 0, term.bot = term.row - 1;
 786         term.mode = MODE_WRAP;
 787         tclearregion(0, 0, term.col-1, term.row-1);
 788 }
 789
 790 void
 791 tnew(int col, int row) {
 792         /* set screen size */
 793         term.row = row, term.col = col;
 794         term.line = malloc(term.row * sizeof(Line));
 795         term.alt  = malloc(term.row * sizeof(Line));
 796         term.dirty = malloc(term.row * sizeof(*term.dirty));
 797
 798         for(row = 0; row < term.row; row++) {
 799                 term.line[row] = malloc(term.col * sizeof(Glyph));
 800                 term.alt [row] = malloc(term.col * sizeof(Glyph));
 801                 term.dirty[row] = 0;
 802         }
 803         /* setup screen */
 804         treset();
 805 }
 806
 807 void
 808 tswapscreen(void) {
 809         Line* tmp = term.line;
 810         term.line = term.alt;
 811         term.alt = tmp;
 812         term.mode ^= MODE_ALTSCREEN;
 813         tfulldirt();
 814 }
 815
 816 void
 817 tscrolldown(int orig, int n) {
 818         int i;
 819         Line temp;
 820
 821         LIMIT(n, 0, term.bot-orig+1);
 822
 823         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 824
 825         for(i = term.bot; i >= orig+n; i--) {
 826                 temp = term.line[i];
 827                 term.line[i] = term.line[i-n];
 828                 term.line[i-n] = temp;
 829
 830                 term.dirty[i] = 1;
 831                 term.dirty[i-n] = 1;
 832         }
 833
 834         selscroll(orig, n);
 835 }
 836
 837 void
 838 tscrollup(int orig, int n) {
 839         int i;
 840         Line temp;
 841         LIMIT(n, 0, term.bot-orig+1);
 842
 843         tclearregion(0, orig, term.col-1, orig+n-1);
 844
 845         for(i = orig; i <= term.bot-n; i++) {
 846                  temp = term.line[i];
 847                  term.line[i] = term.line[i+n];
 848                  term.line[i+n] = temp;
 849
 850                  term.dirty[i] = 1;
 851                  term.dirty[i+n] = 1;
 852         }
 853
 854         selscroll(orig, -n);
 855 }
 856
 857 void
 858 selscroll(int orig, int n) {
 859         if(sel.bx == -1)
 860                 return;
 861
 862         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
 863                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
 864                         sel.bx = -1;
 865                         return;
 866                 }
 867                 if(sel.by < term.top) {
 868                         sel.by = term.top;
 869                         sel.bx = 0;
 870                 }
 871                 if(sel.ey > term.bot) {
 872                         sel.ey = term.bot;
 873                         sel.ex = term.col;
 874                 }
 875                 sel.b.y = sel.by, sel.b.x = sel.bx;
 876                 sel.e.y = sel.ey, sel.e.x = sel.ex;
 877         }
 878 }
 879
 880 void
 881 tnewline(int first_col) {
 882         int y = term.c.y;
 883         if(y == term.bot)
 884                 tscrollup(term.top, 1);
 885         else
 886                 y++;
 887         tmoveto(first_col ? 0 : term.c.x, y);
 888 }
 889
 890 void
 891 csiparse(void) {
 892         /* int noarg = 1; */
 893         char *p = escseq.buf;
 894
 895         escseq.narg = 0;
 896         if(*p == '?')
 897                 escseq.priv = 1, p++;
 898
 899         while(p < escseq.buf+escseq.len) {
 900                 while(isdigit(*p)) {
 901                         escseq.arg[escseq.narg] *= 10;
 902                         escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
 903                 }
 904                 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
 905                         escseq.narg++, p++;
 906                 else {
 907                         escseq.mode = *p;
 908                         escseq.narg++;
 909                         return;
 910                 }
 911         }
 912 }
 913
 914 void
 915 tmoveto(int x, int y) {
 916         LIMIT(x, 0, term.col-1);
 917         LIMIT(y, 0, term.row-1);
 918         term.c.state &= ~CURSOR_WRAPNEXT;
 919         term.c.x = x;
 920         term.c.y = y;
 921 }
 922
 923 void
 924 tsetchar(char *c) {
 925         term.dirty[term.c.y] = 1;
 926         term.line[term.c.y][term.c.x] = term.c.attr;
 927         memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
 928         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
 929 }
 930
 931 void
 932 tclearregion(int x1, int y1, int x2, int y2) {
 933         int x, y, temp;
 934
 935         if(x1 > x2)
 936                 temp = x1, x1 = x2, x2 = temp;
 937         if(y1 > y2)
 938                 temp = y1, y1 = y2, y2 = temp;
 939
 940         LIMIT(x1, 0, term.col-1);
 941         LIMIT(x2, 0, term.col-1);
 942         LIMIT(y1, 0, term.row-1);
 943         LIMIT(y2, 0, term.row-1);
 944
 945         for(y = y1; y <= y2; y++) {
 946                 term.dirty[y] = 1;
 947                 for(x = x1; x <= x2; x++)
 948                         term.line[y][x].state = 0;
 949         }
 950 }
 951
 952 void
 953 tdeletechar(int n) {
 954         int src = term.c.x + n;
 955         int dst = term.c.x;
 956         int size = term.col - src;
 957
 958         term.dirty[term.c.y] = 1;
 959
 960         if(src >= term.col) {
 961                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 962                 return;
 963         }
 964         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 965         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 966 }
 967
 968 void
 969 tinsertblank(int n) {
 970         int src = term.c.x;
 971         int dst = src + n;
 972         int size = term.col - dst;
 973
 974         term.dirty[term.c.y] = 1;
 975
 976         if(dst >= term.col) {
 977                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
 978                 return;
 979         }
 980         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
 981         tclearregion(src, term.c.y, dst - 1, term.c.y);
 982 }
 983
 984 void
 985 tinsertblankline(int n) {
 986         if(term.c.y < term.top || term.c.y > term.bot)
 987                 return;
 988
 989         tscrolldown(term.c.y, n);
 990 }
 991
 992 void
 993 tdeleteline(int n) {
 994         if(term.c.y < term.top || term.c.y > term.bot)
 995                 return;
 996
 997         tscrollup(term.c.y, n);
 998 }
 999
1000 void
1001 tsetattr(int *attr, int l) {
1002         int i;
1003
1004         for(i = 0; i < l; i++) {
1005                 switch(attr[i]) {
1006                 case 0:
1007                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
1008                         term.c.attr.fg = DefaultFG;
1009                         term.c.attr.bg = DefaultBG;
1010                         break;
1011                 case 1:
1012                         term.c.attr.mode |= ATTR_BOLD;
1013                         break;
1014                 case 4:
1015                         term.c.attr.mode |= ATTR_UNDERLINE;
1016                         break;
1017                 case 7:
1018                         term.c.attr.mode |= ATTR_REVERSE;
1019                         break;
1020                 case 22:
1021                         term.c.attr.mode &= ~ATTR_BOLD;
1022                         break;
1023                 case 24:
1024                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1025                         break;
1026                 case 27:
1027                         term.c.attr.mode &= ~ATTR_REVERSE;
1028                         break;
1029                 case 38:
1030                         if(i + 2 < l && attr[i + 1] == 5) {
1031                                 i += 2;
1032                                 if(BETWEEN(attr[i], 0, 255))
1033                                         term.c.attr.fg = attr[i];
1034                                 else
1035                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
1036                         }
1037                         else
1038                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
1039                         break;
1040                 case 39:
1041                         term.c.attr.fg = DefaultFG;
1042                         break;
1043                 case 48:
1044                         if(i + 2 < l && attr[i + 1] == 5) {
1045                                 i += 2;
1046                                 if(BETWEEN(attr[i], 0, 255))
1047                                         term.c.attr.bg = attr[i];
1048                                 else
1049                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
1050                         }
1051                         else
1052                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
1053                         break;
1054                 case 49:
1055                         term.c.attr.bg = DefaultBG;
1056                         break;
1057                 default:
1058                         if(BETWEEN(attr[i], 30, 37))
1059                                 term.c.attr.fg = attr[i] - 30;
1060                         else if(BETWEEN(attr[i], 40, 47))
1061                                 term.c.attr.bg = attr[i] - 40;
1062                         else if(BETWEEN(attr[i], 90, 97))
1063                                 term.c.attr.fg = attr[i] - 90 + 8;
1064                         else if(BETWEEN(attr[i], 100, 107))
1065                                 term.c.attr.fg = attr[i] - 100 + 8;
1066                         else
1067                                 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]), csidump();
1068
1069                         break;
1070                 }
1071         }
1072 }
1073
1074 void
1075 tsetscroll(int t, int b) {
1076         int temp;
1077
1078         LIMIT(t, 0, term.row-1);
1079         LIMIT(b, 0, term.row-1);
1080         if(t > b) {
1081                 temp = t;
1082                 t = b;
1083                 b = temp;
1084         }
1085         term.top = t;
1086         term.bot = b;
1087 }
1088
1089 void
1090 csihandle(void) {
1091         switch(escseq.mode) {
1092         default:
1093         unknown:
1094                 fprintf(stderr, "erresc: unknown csi ");
1095                 csidump();
1096                 /* die(""); */
1097                 break;
1098         case '@': /* ICH -- Insert <n> blank char */
1099                 DEFAULT(escseq.arg[0], 1);
1100                 tinsertblank(escseq.arg[0]);
1101                 break;
1102         case 'A': /* CUU -- Cursor <n> Up */
1103         case 'e':
1104                 DEFAULT(escseq.arg[0], 1);
1105                 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
1106                 break;
1107         case 'B': /* CUD -- Cursor <n> Down */
1108                 DEFAULT(escseq.arg[0], 1);
1109                 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
1110                 break;
1111         case 'C': /* CUF -- Cursor <n> Forward */
1112         case 'a':
1113                 DEFAULT(escseq.arg[0], 1);
1114                 tmoveto(term.c.x+escseq.arg[0], term.c.y);
1115                 break;
1116         case 'D': /* CUB -- Cursor <n> Backward */
1117                 DEFAULT(escseq.arg[0], 1);
1118                 tmoveto(term.c.x-escseq.arg[0], term.c.y);
1119                 break;
1120         case 'E': /* CNL -- Cursor <n> Down and first col */
1121                 DEFAULT(escseq.arg[0], 1);
1122                 tmoveto(0, term.c.y+escseq.arg[0]);
1123                 break;
1124         case 'F': /* CPL -- Cursor <n> Up and first col */
1125                 DEFAULT(escseq.arg[0], 1);
1126                 tmoveto(0, term.c.y-escseq.arg[0]);
1127                 break;
1128         case 'G': /* CHA -- Move to <col> */
1129         case '`': /* XXX: HPA -- same? */
1130                 DEFAULT(escseq.arg[0], 1);
1131                 tmoveto(escseq.arg[0]-1, term.c.y);
1132                 break;
1133         case 'H': /* CUP -- Move to <row> <col> */
1134         case 'f': /* XXX: HVP -- same? */
1135                 DEFAULT(escseq.arg[0], 1);
1136                 DEFAULT(escseq.arg[1], 1);
1137                 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
1138                 break;
1139         /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
1140         case 'J': /* ED -- Clear screen */
1141                 sel.bx = -1;
1142                 switch(escseq.arg[0]) {
1143                 case 0: /* below */
1144                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1145                         if(term.c.y < term.row-1)
1146                                 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1147                         break;
1148                 case 1: /* above */
1149                         if(term.c.y > 1)
1150                                 tclearregion(0, 0, term.col-1, term.c.y-1);
1151                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1152                         break;
1153                 case 2: /* all */
1154                         tclearregion(0, 0, term.col-1, term.row-1);
1155                         break;
1156                 default:
1157                         goto unknown;
1158                 }
1159                 break;
1160         case 'K': /* EL -- Clear line */
1161                 switch(escseq.arg[0]) {
1162                 case 0: /* right */
1163                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1164                         break;
1165                 case 1: /* left */
1166                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1167                         break;
1168                 case 2: /* all */
1169                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1170                         break;
1171                 }
1172                 break;
1173         case 'S': /* SU -- Scroll <n> line up */
1174                 DEFAULT(escseq.arg[0], 1);
1175                 tscrollup(term.top, escseq.arg[0]);
1176                 break;
1177         case 'T': /* SD -- Scroll <n> line down */
1178                 DEFAULT(escseq.arg[0], 1);
1179                 tscrolldown(term.top, escseq.arg[0]);
1180                 break;
1181         case 'L': /* IL -- Insert <n> blank lines */
1182                 DEFAULT(escseq.arg[0], 1);
1183                 tinsertblankline(escseq.arg[0]);
1184                 break;
1185         case 'l': /* RM -- Reset Mode */
1186                 if(escseq.priv) {
1187                         switch(escseq.arg[0]) {
1188                         case 1:
1189                                 term.mode &= ~MODE_APPKEYPAD;
1190                                 break;
1191                         case 5: /* DECSCNM -- Remove reverse video */
1192                                 if(IS_SET(MODE_REVERSE)) {
1193                                         term.mode &= ~MODE_REVERSE;
1194                                         draw();
1195                                 }
1196                                 break;
1197                         case 7:
1198                                 term.mode &= ~MODE_WRAP;
1199                                 break;
1200                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
1201                                 break;
1202                         case 20:
1203                                 term.mode &= ~MODE_CRLF;
1204                                 break;
1205                         case 25:
1206                                 term.c.state |= CURSOR_HIDE;
1207                                 break;
1208                         case 1000: /* disable X11 xterm mouse reporting */
1209                                 term.mode &= ~MODE_MOUSEBTN;
1210                                 break;
1211                         case 1002:
1212                                 term.mode &= ~MODE_MOUSEMOTION;
1213                                 break;
1214                         case 1049: /* = 1047 and 1048 */
1215                         case 47:
1216                         case 1047:
1217                                 if(IS_SET(MODE_ALTSCREEN)) {
1218                                         tclearregion(0, 0, term.col-1, term.row-1);
1219                                         tswapscreen();
1220                                 }
1221                                 if(escseq.arg[0] != 1049)
1222                                         break;
1223                         case 1048:
1224                                 tcursor(CURSOR_LOAD);
1225                                 break;
1226                         default:
1227                                 goto unknown;
1228                         }
1229                 } else {
1230                         switch(escseq.arg[0]) {
1231                         case 4:
1232                                 term.mode &= ~MODE_INSERT;
1233                                 break;
1234                         default:
1235                                 goto unknown;
1236                         }
1237                 }
1238                 break;
1239         case 'M': /* DL -- Delete <n> lines */
1240                 DEFAULT(escseq.arg[0], 1);
1241                 tdeleteline(escseq.arg[0]);
1242                 break;
1243         case 'X': /* ECH -- Erase <n> char */
1244                 DEFAULT(escseq.arg[0], 1);
1245                 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
1246                 break;
1247         case 'P': /* DCH -- Delete <n> char */
1248                 DEFAULT(escseq.arg[0], 1);
1249                 tdeletechar(escseq.arg[0]);
1250                 break;
1251         /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
1252         case 'd': /* VPA -- Move to <row> */
1253                 DEFAULT(escseq.arg[0], 1);
1254                 tmoveto(term.c.x, escseq.arg[0]-1);
1255                 break;
1256         case 'h': /* SM -- Set terminal mode */
1257                 if(escseq.priv) {
1258                         switch(escseq.arg[0]) {
1259                         case 1:
1260                                 term.mode |= MODE_APPKEYPAD;
1261                                 break;
1262                         case 5: /* DECSCNM -- Reverve video */
1263                                 if(!IS_SET(MODE_REVERSE)) {
1264                                         term.mode |= MODE_REVERSE;
1265                                         draw();
1266                                 }
1267                                 break;
1268                         case 7:
1269                                 term.mode |= MODE_WRAP;
1270                                 break;
1271                         case 20:
1272                                 term.mode |= MODE_CRLF;
1273                                 break;
1274                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1275                                  /* fallthrough for xterm cvvis = CSI [ ? 12 ; 25 h */
1276                                 if(escseq.narg > 1 && escseq.arg[1] != 25)
1277                                         break;
1278                         case 25:
1279                                 term.c.state &= ~CURSOR_HIDE;
1280                                 break;
1281                         case 1000: /* 1000,1002: enable xterm mouse report */
1282                                 term.mode |= MODE_MOUSEBTN;
1283                                 break;
1284                         case 1002:
1285                                 term.mode |= MODE_MOUSEMOTION;
1286                                 break;
1287                         case 1049: /* = 1047 and 1048 */
1288                         case 47:
1289                         case 1047:
1290                                 if(IS_SET(MODE_ALTSCREEN))
1291                                         tclearregion(0, 0, term.col-1, term.row-1);
1292                                 else
1293                                         tswapscreen();
1294                                 if(escseq.arg[0] != 1049)
1295                                         break;
1296                         case 1048:
1297                                 tcursor(CURSOR_SAVE);
1298                                 break;
1299                         default: goto unknown;
1300                         }
1301                 } else {
1302                         switch(escseq.arg[0]) {
1303                         case 4:
1304                                 term.mode |= MODE_INSERT;
1305                                 break;
1306                         default: goto unknown;
1307                         }
1308                 };
1309                 break;
1310         case 'm': /* SGR -- Terminal attribute (color) */
1311                 tsetattr(escseq.arg, escseq.narg);
1312                 break;
1313         case 'r': /* DECSTBM -- Set Scrolling Region */
1314                 if(escseq.priv)
1315                         goto unknown;
1316                 else {
1317                         DEFAULT(escseq.arg[0], 1);
1318                         DEFAULT(escseq.arg[1], term.row);
1319                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
1320                         tmoveto(0, 0);
1321                 }
1322                 break;
1323         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1324                 tcursor(CURSOR_SAVE);
1325                 break;
1326         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1327                 tcursor(CURSOR_LOAD);
1328                 break;
1329         }
1330 }
1331
1332 void
1333 csidump(void) {
1334         int i;
1335         printf("ESC [ %s", escseq.priv ? "? " : "");
1336         if(escseq.narg)
1337                 for(i = 0; i < escseq.narg; i++)
1338                         printf("%d ", escseq.arg[i]);
1339         if(escseq.mode)
1340                 putchar(escseq.mode);
1341         putchar('\n');
1342 }
1343
1344 void
1345 csireset(void) {
1346         memset(&escseq, 0, sizeof(escseq));
1347 }
1348
1349 void
1350 tputtab(void) {
1351         int space = TAB - term.c.x % TAB;
1352         tmoveto(term.c.x + space, term.c.y);
1353 }
1354
1355 void
1356 tputc(char *c) {
1357         char ascii = *c;
1358         if(term.esc & ESC_START) {
1359                 if(term.esc & ESC_CSI) {
1360                         escseq.buf[escseq.len++] = ascii;
1361                         if(BETWEEN(ascii, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
1362                                 term.esc = 0;
1363                                 csiparse(), csihandle();
1364                         }
1365                         /* TODO: handle other OSC */
1366                 } else if(term.esc & ESC_OSC) {
1367                         if(ascii == ';') {
1368                                 term.titlelen = 0;
1369                                 term.esc = ESC_START | ESC_TITLE;
1370                         }
1371                 } else if(term.esc & ESC_TITLE) {
1372                         if(ascii == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
1373                                 term.esc = 0;
1374                                 term.title[term.titlelen] = '\0';
1375                                 XStoreName(xw.dpy, xw.win, term.title);
1376                         } else {
1377                                 term.title[term.titlelen++] = ascii;
1378                         }
1379                 } else if(term.esc & ESC_ALTCHARSET) {
1380                         switch(ascii) {
1381                         case '0': /* Line drawing crap */
1382                                 term.c.attr.mode |= ATTR_GFX;
1383                                 break;
1384                         case 'B': /* Back to regular text */
1385                                 term.c.attr.mode &= ~ATTR_GFX;
1386                                 break;
1387                         default:
1388                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1389                         }
1390                         term.esc = 0;
1391                 } else {
1392                         switch(ascii) {
1393                         case '[':
1394                                 term.esc |= ESC_CSI;
1395                                 break;
1396                         case ']':
1397                                 term.esc |= ESC_OSC;
1398                                 break;
1399                         case '(':
1400                                 term.esc |= ESC_ALTCHARSET;
1401                                 break;
1402                         case 'D': /* IND -- Linefeed */
1403                                 if(term.c.y == term.bot)
1404                                         tscrollup(term.top, 1);
1405                                 else
1406                                         tmoveto(term.c.x, term.c.y+1);
1407                                 term.esc = 0;
1408                                 break;
1409                         case 'E': /* NEL -- Next line */
1410                                 tnewline(1); /* always go to first col */
1411                                 term.esc = 0;
1412                                 break;
1413                         case 'M': /* RI -- Reverse index */
1414                                 if(term.c.y == term.top)
1415                                         tscrolldown(term.top, 1);
1416                                 else
1417                                         tmoveto(term.c.x, term.c.y-1);
1418                                 term.esc = 0;
1419                                 break;
1420                         case 'c': /* RIS -- Reset to inital state */
1421                                 treset();
1422                                 term.esc = 0;
1423                                 break;
1424                         case '=': /* DECPAM -- Application keypad */
1425                                 term.mode |= MODE_APPKEYPAD;
1426                                 term.esc = 0;
1427                                 break;
1428                         case '>': /* DECPNM -- Normal keypad */
1429                                 term.mode &= ~MODE_APPKEYPAD;
1430                                 term.esc = 0;
1431                                 break;
1432                         case '7': /* DECSC -- Save Cursor */
1433                                 tcursor(CURSOR_SAVE);
1434                                 term.esc = 0;
1435                                 break;
1436                         case '8': /* DECRC -- Restore Cursor */
1437                                 tcursor(CURSOR_LOAD);
1438                                 term.esc = 0;
1439                                 break;
1440                         default:
1441                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1442                                     (unsigned char) ascii, isprint(ascii)?ascii:'.');
1443                                 term.esc = 0;
1444                         }
1445                 }
1446         } else {
1447                 if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
1448                         sel.bx = -1;
1449                 switch(ascii) {
1450                 case '\t':
1451                         tputtab();
1452                         break;
1453                 case '\b':
1454                         tmoveto(term.c.x-1, term.c.y);
1455                         break;
1456                 case '\r':
1457                         tmoveto(0, term.c.y);
1458                         break;
1459                 case '\f':
1460                 case '\v':
1461                 case '\n':
1462                         /* go to first col if the mode is set */
1463                         tnewline(IS_SET(MODE_CRLF));
1464                         break;
1465                 case '\a':
1466                         if(!(xw.state & WIN_FOCUSED))
1467                                 xseturgency(1);
1468                         break;
1469                 case '\033':
1470                         csireset();
1471                         term.esc = ESC_START;
1472                         break;
1473                 default:
1474                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1475                                 tnewline(1); /* always go to first col */
1476                         tsetchar(c);
1477                         if(term.c.x+1 < term.col)
1478                                 tmoveto(term.c.x+1, term.c.y);
1479                         else
1480                                 term.c.state |= CURSOR_WRAPNEXT;
1481                 }
1482         }
1483 }
1484
1485 int
1486 tresize(int col, int row) {
1487         int i, x;
1488         int minrow = MIN(row, term.row);
1489         int mincol = MIN(col, term.col);
1490         int slide = term.c.y - row + 1;
1491
1492         if(col < 1 || row < 1)
1493                 return 0;
1494
1495         /* free unneeded rows */
1496         i = 0;
1497         if(slide > 0) {
1498                 /* slide screen to keep cursor where we expect it -
1499                  * tscrollup would work here, but we can optimize to
1500                  * memmove because we're freeing the earlier lines */
1501                 for(/* i = 0 */; i < slide; i++) {
1502                         free(term.line[i]);
1503                         free(term.alt[i]);
1504                 }
1505                 memmove(term.line, term.line + slide, row * sizeof(Line));
1506                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1507         }
1508         for(i += row; i < term.row; i++) {
1509                 free(term.line[i]);
1510                 free(term.alt[i]);
1511         }
1512
1513         /* resize to new height */
1514         term.line = realloc(term.line, row * sizeof(Line));
1515         term.alt  = realloc(term.alt,  row * sizeof(Line));
1516         term.dirty = realloc(term.dirty, row * sizeof(*term.dirty));
1517
1518         /* resize each row to new width, zero-pad if needed */
1519         for(i = 0; i < minrow; i++) {
1520                 term.dirty[i] = 1;
1521                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1522                 term.alt[i]  = realloc(term.alt[i],  col * sizeof(Glyph));
1523                 for(x = mincol; x < col; x++) {
1524                         term.line[i][x].state = 0;
1525                         term.alt[i][x].state = 0;
1526                 }
1527         }
1528
1529         /* allocate any new rows */
1530         for(/* i == minrow */; i < row; i++) {
1531                 term.dirty[i] = 1;
1532                 term.line[i] = calloc(col, sizeof(Glyph));
1533                 term.alt [i] = calloc(col, sizeof(Glyph));
1534         }
1535
1536         /* update terminal size */
1537         term.col = col, term.row = row;
1538         /* make use of the LIMIT in tmoveto */
1539         tmoveto(term.c.x, term.c.y);
1540         /* reset scrolling region */
1541         tsetscroll(0, row-1);
1542
1543         return (slide > 0);
1544 }
1545
1546 void
1547 xresize(int col, int row) {
1548         Pixmap newbuf;
1549         int oldw, oldh;
1550
1551         oldw = xw.bufw;
1552         oldh = xw.bufh;
1553         xw.bufw = MAX(1, col * xw.cw);
1554         xw.bufh = MAX(1, row * xw.ch);
1555         newbuf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1556         XCopyArea(xw.dpy, xw.buf, newbuf, dc.gc, 0, 0, xw.bufw, xw.bufh, 0, 0);
1557         XFreePixmap(xw.dpy, xw.buf);
1558         XSetForeground(xw.dpy, dc.gc, dc.col[DefaultBG]);
1559         if(xw.bufw > oldw)
1560                 XFillRectangle(xw.dpy, newbuf, dc.gc, oldw, 0,
1561                                 xw.bufw-oldw, MIN(xw.bufh, oldh));
1562         else if(xw.bufw < oldw && (BORDER > 0 || xw.w > xw.bufw))
1563                 XClearArea(xw.dpy, xw.win, BORDER+xw.bufw, BORDER,
1564                                 xw.w-xw.bufh-BORDER, BORDER+MIN(xw.bufh, oldh),
1565                                 False);
1566         if(xw.bufh > oldh)
1567                 XFillRectangle(xw.dpy, newbuf, dc.gc, 0, oldh,
1568                                 xw.bufw, xw.bufh-oldh);
1569         else if(xw.bufh < oldh && (BORDER > 0 || xw.h > xw.bufh))
1570                 XClearArea(xw.dpy, xw.win, BORDER, BORDER+xw.bufh,
1571                                 xw.w-2*BORDER, xw.h-xw.bufh-BORDER,
1572                                 False);
1573         xw.buf = newbuf;
1574 }
1575
1576 void
1577 xloadcols(void) {
1578         int i, r, g, b;
1579         XColor color;
1580         unsigned long white = WhitePixel(xw.dpy, xw.scr);
1581
1582         for(i = 0; i < LEN(colorname); i++) {
1583                 if(!XAllocNamedColor(xw.dpy, xw.cmap, colorname[i], &color, &color)) {
1584                         dc.col[i] = white;
1585                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1586                 } else
1587                         dc.col[i] = color.pixel;
1588         }
1589
1590         /* same colors as xterm */
1591         for(r = 0; r < 6; r++)
1592                 for(g = 0; g < 6; g++)
1593                         for(b = 0; b < 6; b++) {
1594                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1595                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1596                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1597                                 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1598                                         dc.col[i] = white;
1599                                         fprintf(stderr, "Could not allocate color %d\n", i);
1600                                 } else
1601                                         dc.col[i] = color.pixel;
1602                                 i++;
1603                         }
1604
1605         for(r = 0; r < 24; r++, i++) {
1606                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1607                 if (!XAllocColor(xw.dpy, xw.cmap, &color)) {
1608                         dc.col[i] = white;
1609                         fprintf(stderr, "Could not allocate color %d\n", i);
1610                 } else
1611                         dc.col[i] = color.pixel;
1612         }
1613 }
1614
1615 void
1616 xclear(int x1, int y1, int x2, int y2) {
1617         XSetForeground(xw.dpy, dc.gc, dc.col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG]);
1618         XFillRectangle(xw.dpy, xw.buf, dc.gc,
1619                        x1 * xw.cw, y1 * xw.ch,
1620                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1621 }
1622
1623 void
1624 xhints(void) {
1625         XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
1626         XWMHints wm = {.flags = InputHint, .input = 1};
1627         XSizeHints size = {
1628                 .flags = PSize | PResizeInc | PBaseSize,
1629                 .height = xw.h,
1630                 .width = xw.w,
1631                 .height_inc = xw.ch,
1632                 .width_inc = xw.cw,
1633                 .base_height = 2*BORDER,
1634                 .base_width = 2*BORDER,
1635         };
1636         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1637 }
1638
1639 XFontSet
1640 xinitfont(char *fontstr) {
1641         XFontSet set;
1642         char *def, **missing;
1643         int n;
1644
1645         missing = NULL;
1646         set = XCreateFontSet(xw.dpy, fontstr, &missing, &n, &def);
1647         if(missing) {
1648                 while(n--)
1649                         fprintf(stderr, "st: missing fontset: %s\n", missing[n]);
1650                 XFreeStringList(missing);
1651         }
1652         return set;
1653 }
1654
1655 void
1656 xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rbearing) {
1657         XFontStruct **xfonts;
1658         char **font_names;
1659         int i, n;
1660
1661         *ascent = *descent = *lbearing = *rbearing = 0;
1662         n = XFontsOfFontSet(set, &xfonts, &font_names);
1663         for(i = 0; i < n; i++) {
1664                 *ascent = MAX(*ascent, (*xfonts)->ascent);
1665                 *descent = MAX(*descent, (*xfonts)->descent);
1666                 *lbearing = MAX(*lbearing, (*xfonts)->min_bounds.lbearing);
1667                 *rbearing = MAX(*rbearing, (*xfonts)->max_bounds.rbearing);
1668                 xfonts++;
1669         }
1670 }
1671
1672 void
1673 initfonts(char *fontstr, char *bfontstr) {
1674         if((dc.font.set = xinitfont(fontstr)) == NULL ||
1675            (dc.bfont.set = xinitfont(bfontstr)) == NULL)
1676                 die("Can't load font %s\n", dc.font.set ? BOLDFONT : FONT);
1677         xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1678             &dc.font.lbearing, &dc.font.rbearing);
1679         xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1680             &dc.bfont.lbearing, &dc.bfont.rbearing);
1681 }
1682
1683 void
1684 xinit(void) {
1685         XSetWindowAttributes attrs;
1686         Cursor cursor;
1687         Window parent;
1688
1689         if(!(xw.dpy = XOpenDisplay(NULL)))
1690                 die("Can't open display\n");
1691         xw.scr = XDefaultScreen(xw.dpy);
1692
1693         /* font */
1694         initfonts(FONT, BOLDFONT);
1695
1696         /* XXX: Assuming same size for bold font */
1697         xw.cw = dc.font.rbearing - dc.font.lbearing;
1698         xw.ch = dc.font.ascent + dc.font.descent;
1699
1700         /* colors */
1701         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1702         xloadcols();
1703
1704         /* window - default size */
1705         xw.bufh = term.row * xw.ch;
1706         xw.bufw = term.col * xw.cw;
1707         xw.h = xw.bufh + 2*BORDER;
1708         xw.w = xw.bufw + 2*BORDER;
1709
1710         attrs.background_pixel = dc.col[DefaultBG];
1711         attrs.border_pixel = dc.col[DefaultBG];
1712         attrs.bit_gravity = NorthWestGravity;
1713         attrs.event_mask = FocusChangeMask | KeyPressMask
1714                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1715                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask
1716                 | EnterWindowMask | LeaveWindowMask;
1717         attrs.colormap = xw.cmap;
1718
1719         parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
1720         xw.win = XCreateWindow(xw.dpy, parent, 0, 0,
1721                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
1722                         XDefaultVisual(xw.dpy, xw.scr),
1723                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1724                         | CWColormap,
1725                         &attrs);
1726         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1727
1728
1729         /* input methods */
1730         xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
1731         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1732                                            | XIMStatusNothing, XNClientWindow, xw.win,
1733                                            XNFocusWindow, xw.win, NULL);
1734         /* gc */
1735         dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
1736
1737         /* white cursor, black outline */
1738         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
1739         XDefineCursor(xw.dpy, xw.win, cursor);
1740         XRecolorCursor(xw.dpy, cursor,
1741                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
1742                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
1743
1744         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
1745
1746         XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
1747         XMapWindow(xw.dpy, xw.win);
1748         xhints();
1749         XSync(xw.dpy, 0);
1750 }
1751
1752 void
1753 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
1754         unsigned long xfg = dc.col[base.fg], xbg = dc.col[base.bg], temp;
1755         int winx = x*xw.cw, winy = y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
1756         int i;
1757
1758         /* only switch default fg/bg if term is in RV mode */
1759         if(IS_SET(MODE_REVERSE)) {
1760                 if(base.fg == DefaultFG)
1761                         xfg = dc.col[DefaultBG];
1762                 if(base.bg == DefaultBG)
1763                         xbg = dc.col[DefaultFG];
1764         }
1765
1766         if(base.mode & ATTR_REVERSE)
1767                 temp = xfg, xfg = xbg, xbg = temp;
1768
1769         XSetBackground(xw.dpy, dc.gc, xbg);
1770         XSetForeground(xw.dpy, dc.gc, xfg);
1771
1772         if(base.mode & ATTR_GFX) {
1773                 for(i = 0; i < bytelen; i++) {
1774                         char c = gfx[(unsigned int)s[i] % 256];
1775                         if(c)
1776                                 s[i] = c;
1777                         else if(s[i] > 0x5f)
1778                                 s[i] -= 0x5f;
1779                 }
1780         }
1781
1782         XmbDrawImageString(xw.dpy, xw.buf, base.mode & ATTR_BOLD ? dc.bfont.set : dc.font.set,
1783                 dc.gc, winx, winy, s, bytelen);
1784
1785         if(base.mode & ATTR_UNDERLINE)
1786                 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1787 }
1788
1789 void
1790 xdrawcursor(void) {
1791         static int oldx = 0;
1792         static int oldy = 0;
1793         int sl;
1794         Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
1795
1796         LIMIT(oldx, 0, term.col-1);
1797         LIMIT(oldy, 0, term.row-1);
1798
1799         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1800                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
1801
1802         /* remove the old cursor */
1803         if(term.line[oldy][oldx].state & GLYPH_SET) {
1804                 sl = utf8size(term.line[oldy][oldx].c);
1805                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
1806         } else
1807                 xclear(oldx, oldy, oldx, oldy);
1808
1809         /* draw the new one */
1810         if(!(term.c.state & CURSOR_HIDE) && (xw.state & WIN_FOCUSED)) {
1811                 sl = utf8size(g.c);
1812                 if(IS_SET(MODE_REVERSE))
1813                         g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
1814                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
1815                 oldx = term.c.x, oldy = term.c.y;
1816         }
1817 }
1818
1819 void
1820 draw() {
1821         drawregion(0, 0, term.col, term.row);
1822 }
1823
1824 void
1825 drawregion(int x1, int y1, int x2, int y2) {
1826         int ic, ib, x, y, ox, sl;
1827         Glyph base, new;
1828         char buf[DRAW_BUF_SIZ];
1829
1830         if(!(xw.state & WIN_VISIBLE))
1831                 return;
1832
1833         for(y = y1; y < y2; y++) {
1834                 if(!term.dirty[y])
1835                         continue;
1836                 xclear(0, y, term.col, y);
1837                 term.dirty[y] = 0;
1838                 base = term.line[y][0];
1839                 ic = ib = ox = 0;
1840                 for(x = x1; x < x2; x++) {
1841                         new = term.line[y][x];
1842                         if(sel.bx != -1 && *(new.c) && selected(x, y))
1843                                 new.mode ^= ATTR_REVERSE;
1844                         if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1845                                                   ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
1846                                 xdraws(buf, base, ox, y, ic, ib);
1847                                 ic = ib = 0;
1848                         }
1849                         if(new.state & GLYPH_SET) {
1850                                 if(ib == 0) {
1851                                         ox = x;
1852                                         base = new;
1853                                 }
1854                                 sl = utf8size(new.c);
1855                                 memcpy(buf+ib, new.c, sl);
1856                                 ib += sl;
1857                                 ++ic;
1858                         }
1859                 }
1860                 if(ib > 0)
1861                         xdraws(buf, base, ox, y, ic, ib);
1862         }
1863         xdrawcursor();
1864         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, x1*xw.cw, y1*xw.ch, x2*xw.cw, y2*xw.ch, BORDER, BORDER);
1865 }
1866
1867 void
1868 expose(XEvent *ev) {
1869         XExposeEvent *e = &ev->xexpose;
1870         if(xw.state & WIN_REDRAW) {
1871                 if(!e->count) {
1872                         xw.state &= ~WIN_REDRAW;
1873                         draw();
1874                 }
1875         } else
1876                 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, e->x-BORDER, e->y-BORDER,
1877                                 e->width, e->height, e->x, e->y);
1878 }
1879
1880 void
1881 visibility(XEvent *ev) {
1882         XVisibilityEvent *e = &ev->xvisibility;
1883         if(e->state == VisibilityFullyObscured)
1884                 xw.state &= ~WIN_VISIBLE;
1885         else if(!(xw.state & WIN_VISIBLE))
1886                 /* need a full redraw for next Expose, not just a buf copy */
1887                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
1888 }
1889
1890 void
1891 unmap(XEvent *ev) {
1892         xw.state &= ~WIN_VISIBLE;
1893 }
1894
1895 void
1896 xseturgency(int add) {
1897         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
1898         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1899         XSetWMHints(xw.dpy, xw.win, h);
1900         XFree(h);
1901 }
1902
1903 void
1904 focus(XEvent *ev) {
1905         if(ev->type == FocusIn) {
1906                 xw.state |= WIN_FOCUSED;
1907                 xseturgency(0);
1908         } else
1909                 xw.state &= ~WIN_FOCUSED;
1910         draw();
1911 }
1912
1913 char*
1914 kmap(KeySym k, unsigned int state) {
1915         int i;
1916         state &= ~Mod2Mask;
1917         for(i = 0; i < LEN(key); i++) {
1918                 unsigned int mask = key[i].mask;
1919                 if(key[i].k == k && ((state & mask) == mask || (mask == XK_NO_MOD && !state)))
1920                         return (char*)key[i].s;
1921         }
1922         return NULL;
1923 }
1924
1925 void
1926 kpress(XEvent *ev) {
1927         XKeyEvent *e = &ev->xkey;
1928         KeySym ksym;
1929         char buf[32];
1930         char *customkey;
1931         int len;
1932         int meta;
1933         int shift;
1934         Status status;
1935
1936         meta = e->state & Mod1Mask;
1937         shift = e->state & ShiftMask;
1938         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
1939
1940         /* 1. custom keys from config.h */
1941         if((customkey = kmap(ksym, e->state)))
1942                 ttywrite(customkey, strlen(customkey));
1943         /* 2. hardcoded (overrides X lookup) */
1944         else
1945                 switch(ksym) {
1946                 case XK_Up:
1947                 case XK_Down:
1948                 case XK_Left:
1949                 case XK_Right:
1950                         /* XXX: shift up/down doesn't work */
1951                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
1952                         ttywrite(buf, 3);
1953                         break;
1954                 case XK_Insert:
1955                         if(shift)
1956                                 selpaste();
1957                         break;
1958                 case XK_Return:
1959                         if(IS_SET(MODE_CRLF))
1960                                 ttywrite("\r\n", 2);
1961                         else
1962                                 ttywrite("\r", 1);
1963                         break;
1964                         /* 3. X lookup  */
1965                 default:
1966                         if(len > 0) {
1967                                 if(meta && len == 1)
1968                                         ttywrite("\033", 1);
1969                                 ttywrite(buf, len);
1970                         }
1971                         break;
1972                 }
1973 }
1974
1975 void
1976 cmessage(XEvent *e) {
1977         /* See xembed specs
1978            http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
1979         if (e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
1980                 if (e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
1981                         xw.state |= WIN_FOCUSED;
1982                         xseturgency(0);
1983                 } else if (e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
1984                         xw.state &= ~WIN_FOCUSED;
1985                 }
1986                 draw();
1987         }
1988 }
1989
1990 void
1991 resize(XEvent *e) {
1992         int col, row;
1993
1994         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1995                 return;
1996
1997         xw.w = e->xconfigure.width;
1998         xw.h = e->xconfigure.height;
1999         col = (xw.w - 2*BORDER) / xw.cw;
2000         row = (xw.h - 2*BORDER) / xw.ch;
2001         if(col == term.col && row == term.row)
2002                 return;
2003         if(tresize(col, row))
2004                 draw();
2005         ttyresize(col, row);
2006         xresize(col, row);
2007 }
2008
2009 void
2010 run(void) {
2011         XEvent ev;
2012         fd_set rfd;
2013         int xfd = XConnectionNumber(xw.dpy);
2014
2015         for(;;) {
2016                 FD_ZERO(&rfd);
2017                 FD_SET(cmdfd, &rfd);
2018                 FD_SET(xfd, &rfd);
2019                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
2020                         if(errno == EINTR)
2021                                 continue;
2022                         die("select failed: %s\n", SERRNO);
2023                 }
2024                 if(FD_ISSET(cmdfd, &rfd)) {
2025                         ttyread();
2026                         draw();
2027                 }
2028                 while(XPending(xw.dpy)) {
2029                         XNextEvent(xw.dpy, &ev);
2030                         if(XFilterEvent(&ev, xw.win))
2031                                 continue;
2032                         if(handler[ev.type])
2033                                 (handler[ev.type])(&ev);
2034                 }
2035         }
2036 }
2037
2038 int
2039 main(int argc, char *argv[]) {
2040         int i;
2041
2042         for(i = 1; i < argc; i++) {
2043                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
2044                 case 't':
2045                         if(++i < argc) opt_title = argv[i];
2046                         break;
2047                 case 'c':
2048                         if(++i < argc) opt_class = argv[i];
2049                         break;
2050                 case 'w':
2051                         if(++i < argc) opt_embed = argv[i];
2052                         break;
2053                 case 'e':
2054                         /* eat every remaining arguments */
2055                         if(++i < argc) opt_cmd = &argv[i];
2056                         goto run;
2057                 case 'v':
2058                 default:
2059                         die(USAGE);
2060                 }
2061         }
2062
2063  run:
2064         setlocale(LC_CTYPE, "");
2065         tnew(80, 24);
2066         ttynew();
2067         xinit();
2068         selinit();
2069         run();
2070         return 0;
2071 }