st.c

   1 /* See LICENSE for licence details. */
   2 #define _XOPEN_SOURCE 600
   3 #include <ctype.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <limits.h>
   7 #include <locale.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <sys/ioctl.h>
  15 #include <sys/select.h>
  16 #include <sys/stat.h>
  17 #include <sys/time.h>
  18 #include <sys/types.h>
  19 #include <sys/wait.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22 #include <X11/Xatom.h>
  23 #include <X11/Xlib.h>
  24 #include <X11/Xutil.h>
  25 #include <X11/cursorfont.h>
  26 #include <X11/keysym.h>
  27 #include <X11/extensions/Xdbe.h>
  28
  29 #if   defined(__linux)
  30  #include <pty.h>
  31 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  32  #include <util.h>
  33 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  34  #include <libutil.h>
  35 #endif
  36
  37 #define USAGE \
  38         "st " VERSION " (c) 2010-2012 st engineers\n" \
  39         "usage: st [-t title] [-c class] [-g geometry]" \
  40         " [-w windowid] [-v] [-f file] [-e command...]\n"
  41
  42 /* XEMBED messages */
  43 #define XEMBED_FOCUS_IN  4
  44 #define XEMBED_FOCUS_OUT 5
  45
  46 /* Arbitrary sizes */
  47 #define ESC_BUF_SIZ   256
  48 #define ESC_ARG_SIZ   16
  49 #define STR_BUF_SIZ   256
  50 #define STR_ARG_SIZ   16
  51 #define DRAW_BUF_SIZ  1024
  52 #define UTF_SIZ       4
  53 #define XK_NO_MOD     UINT_MAX
  54 #define XK_ANY_MOD    0
  55
  56 #define SELECT_TIMEOUT (20*1000) /* 20 ms */
  57 #define DRAW_TIMEOUT  (20*1000) /* 20 ms */
  58 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  59
  60 #define SERRNO strerror(errno)
  61 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  62 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  63 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  64 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  65 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  66 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  67 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  68 #define IS_SET(flag) (term.mode & (flag))
  69 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  70 #define X2COL(x) (((x) - BORDER)/xw.cw)
  71 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
  72
  73 enum glyph_attribute {
  74         ATTR_NULL      = 0,
  75         ATTR_REVERSE   = 1,
  76         ATTR_UNDERLINE = 2,
  77         ATTR_BOLD      = 4,
  78         ATTR_GFX       = 8,
  79 };
  80
  81 enum cursor_movement {
  82         CURSOR_UP,
  83         CURSOR_DOWN,
  84         CURSOR_LEFT,
  85         CURSOR_RIGHT,
  86         CURSOR_SAVE,
  87         CURSOR_LOAD
  88 };
  89
  90 enum cursor_state {
  91         CURSOR_DEFAULT  = 0,
  92         CURSOR_HIDE     = 1,
  93         CURSOR_WRAPNEXT = 2
  94 };
  95
  96 enum glyph_state {
  97         GLYPH_SET   = 1,
  98         GLYPH_DIRTY = 2
  99 };
 100
 101 enum term_mode {
 102         MODE_WRAP       = 1,
 103         MODE_INSERT      = 2,
 104         MODE_APPKEYPAD   = 4,
 105         MODE_ALTSCREEN   = 8,
 106         MODE_CRLF       = 16,
 107         MODE_MOUSEBTN    = 32,
 108         MODE_MOUSEMOTION = 64,
 109         MODE_MOUSE       = 32|64,
 110         MODE_REVERSE     = 128
 111 };
 112
 113 enum escape_state {
 114         ESC_START      = 1,
 115         ESC_CSI = 2,
 116         ESC_STR = 4, /* DSC, OSC, PM, APC */
 117         ESC_ALTCHARSET = 8,
 118         ESC_STR_END    = 16, /* a final string was encountered */
 119 };
 120
 121 enum window_state {
 122         WIN_VISIBLE = 1,
 123         WIN_REDRAW  = 2,
 124         WIN_FOCUSED = 4
 125 };
 126
 127 /* bit macro */
 128 #undef B0
 129 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 130
 131 typedef unsigned char uchar;
 132 typedef unsigned int uint;
 133 typedef unsigned long ulong;
 134 typedef unsigned short ushort;
 135
 136 typedef struct {
 137         char c[UTF_SIZ];     /* character code */
 138         uchar mode;  /* attribute flags */
 139         ushort fg;   /* foreground  */
 140         ushort bg;   /* background  */
 141         uchar state; /* state flags    */
 142 } Glyph;
 143
 144 typedef Glyph* Line;
 145
 146 typedef struct {
 147         Glyph attr;      /* current char attributes */
 148         int x;
 149         int y;
 150         char state;
 151 } TCursor;
 152
 153 /* CSI Escape sequence structs */
 154 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 155 typedef struct {
 156         char buf[ESC_BUF_SIZ]; /* raw string */
 157         int len;               /* raw string length */
 158         char priv;
 159         int arg[ESC_ARG_SIZ];
 160         int narg;             /* nb of args */
 161         char mode;
 162 } CSIEscape;
 163
 164 /* STR Escape sequence structs */
 165 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 166 typedef struct {
 167         char type;           /* ESC type ... */
 168         char buf[STR_BUF_SIZ]; /* raw string */
 169         int len;               /* raw string length */
 170         char *args[STR_ARG_SIZ];
 171         int narg;             /* nb of args */
 172 } STREscape;
 173
 174 /* Internal representation of the screen */
 175 typedef struct {
 176         int row;        /* nb row */
 177         int col;        /* nb col */
 178         Line* line;     /* screen */
 179         Line* alt;      /* alternate screen */
 180         bool* dirty;    /* dirtyness of lines */
 181         TCursor c;      /* cursor */
 182         int top;        /* top    scroll limit */
 183         int bot;        /* bottom scroll limit */
 184         int mode;       /* terminal mode flags */
 185         int esc;        /* escape state flags */
 186         bool *tabs;
 187 } Term;
 188
 189 /* Purely graphic info */
 190 typedef struct {
 191         Display* dpy;
 192         Colormap cmap;
 193         Window win;
 194         XdbeBackBuffer buf;
 195         Atom xembed;
 196         XIM xim;
 197         XIC xic;
 198         int scr;
 199         Bool isfixed; /* is fixed geometry? */
 200         int fx, fy, fw, fh; /* fixed geometry */
 201         int w;  /* window width */
 202         int h;  /* window height */
 203         int ch; /* char height */
 204         int cw; /* char width  */
 205         char state; /* focus, redraw, visible */
 206         struct timeval lastdraw;
 207 } XWindow;
 208
 209 typedef struct {
 210         KeySym k;
 211         uint mask;
 212         char s[ESC_BUF_SIZ];
 213 } Key;
 214
 215
 216 /* TODO: use better name for vars... */
 217 typedef struct {
 218         int mode;
 219         int bx, by;
 220         int ex, ey;
 221         struct {int x, y;} b, e;
 222         char *clip;
 223         Atom xtarget;
 224         bool alt;
 225         struct timeval tclick1;
 226         struct timeval tclick2;
 227 } Selection;
 228
 229 #include "config.h"
 230
 231 /* Drawing Context */
 232 typedef struct {
 233         ulong col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 234         GC gc;
 235         struct {
 236                 int ascent;
 237                 int descent;
 238                 short lbearing;
 239                 short rbearing;
 240                 XFontSet set;
 241         } font, bfont;
 242 } DC;
 243
 244 static void die(const char*, ...);
 245 static void draw(void);
 246 static void redraw(void);
 247 static void drawregion(int, int, int, int);
 248 static void execsh(void);
 249 static void sigchld(int);
 250 static void run(void);
 251 static bool last_draw_too_old(void);
 252
 253 static void csidump(void);
 254 static void csihandle(void);
 255 static void csiparse(void);
 256 static void csireset(void);
 257 static void strdump(void);
 258 static void strhandle(void);
 259 static void strparse(void);
 260 static void strreset(void);
 261
 262 static void tclearregion(int, int, int, int);
 263 static void tcursor(int);
 264 static void tdeletechar(int);
 265 static void tdeleteline(int);
 266 static void tinsertblank(int);
 267 static void tinsertblankline(int);
 268 static void tmoveto(int, int);
 269 static void tnew(int, int);
 270 static void tnewline(int);
 271 static void tputtab(bool);
 272 static void tputc(char*);
 273 static void treset(void);
 274 static int tresize(int, int);
 275 static void tscrollup(int, int);
 276 static void tscrolldown(int, int);
 277 static void tsetattr(int*, int);
 278 static void tsetchar(char*);
 279 static void tsetscroll(int, int);
 280 static void tswapscreen(void);
 281 static void tsetdirt(int, int);
 282 static void tsetmode(bool, bool, int *, int);
 283 static void tfulldirt(void);
 284
 285 static void ttynew(void);
 286 static void ttyread(void);
 287 static void ttyresize(int, int);
 288 static void ttywrite(const char *, size_t);
 289
 290 static void xdraws(char *, Glyph, int, int, int, int);
 291 static void xhints(void);
 292 static void xclear(int, int, int, int);
 293 static void xcopy();
 294 static void xdrawcursor(void);
 295 static void xinit(void);
 296 static void xloadcols(void);
 297 static void xseturgency(int);
 298 static void xsetsel(char*);
 299 static void xresize(int, int);
 300
 301 static void expose(XEvent *);
 302 static void visibility(XEvent *);
 303 static void unmap(XEvent *);
 304 static char* kmap(KeySym, uint);
 305 static void kpress(XEvent *);
 306 static void cmessage(XEvent *);
 307 static void resize(XEvent *);
 308 static void focus(XEvent *);
 309 static void brelease(XEvent *);
 310 static void bpress(XEvent *);
 311 static void bmotion(XEvent *);
 312 static void selnotify(XEvent *);
 313 static void selrequest(XEvent *);
 314
 315 static void selinit(void);
 316 static inline bool selected(int, int);
 317 static void selcopy(void);
 318 static void selpaste();
 319 static void selscroll(int, int);
 320
 321 static int utf8decode(char *, long *);
 322 static int utf8encode(long *, char *);
 323 static int utf8size(char *);
 324 static int isfullutf8(char *, int);
 325
 326 static void (*handler[LASTEvent])(XEvent *) = {
 327         [KeyPress] = kpress,
 328         [ClientMessage] = cmessage,
 329         [ConfigureNotify] = resize,
 330         [VisibilityNotify] = visibility,
 331         [UnmapNotify] = unmap,
 332         [Expose] = expose,
 333         [FocusIn] = focus,
 334         [FocusOut] = focus,
 335         [MotionNotify] = bmotion,
 336         [ButtonPress] = bpress,
 337         [ButtonRelease] = brelease,
 338         [SelectionNotify] = selnotify,
 339         [SelectionRequest] = selrequest,
 340 };
 341
 342 /* Globals */
 343 static DC dc;
 344 static XWindow xw;
 345 static Term term;
 346 static CSIEscape csiescseq;
 347 static STREscape strescseq;
 348 static int cmdfd;
 349 static pid_t pid;
 350 static Selection sel;
 351 static FILE *fileio;
 352 static char **opt_cmd  = NULL;
 353 static char *opt_io    = NULL;
 354 static char *opt_title = NULL;
 355 static char *opt_embed = NULL;
 356 static char *opt_class = NULL;
 357
 358 int
 359 utf8decode(char *s, long *u) {
 360         uchar c;
 361         int i, n, rtn;
 362
 363         rtn = 1;
 364         c = *s;
 365         if(~c & B7) { /* 0xxxxxxx */
 366                 *u = c;
 367                 return rtn;
 368         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 369                 *u = c&(B4|B3|B2|B1|B0);
 370                 n = 1;
 371         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 372                 *u = c&(B3|B2|B1|B0);
 373                 n = 2;
 374         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 375                 *u = c & (B2|B1|B0);
 376                 n = 3;
 377         } else
 378                 goto invalid;
 379         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 380                 c = *s;
 381                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 382                         goto invalid;
 383                 *u <<= 6;
 384                 *u |= c & (B5|B4|B3|B2|B1|B0);
 385         }
 386         if((n == 1 && *u < 0x80) ||
 387            (n == 2 && *u < 0x800) ||
 388            (n == 3 && *u < 0x10000) ||
 389            (*u >= 0xD800 && *u <= 0xDFFF))
 390                 goto invalid;
 391         return rtn;
 392 invalid:
 393         *u = 0xFFFD;
 394         return rtn;
 395 }
 396
 397 int
 398 utf8encode(long *u, char *s) {
 399         uchar *sp;
 400         ulong uc;
 401         int i, n;
 402
 403         sp = (uchar*) s;
 404         uc = *u;
 405         if(uc < 0x80) {
 406                 *sp = uc; /* 0xxxxxxx */
 407                 return 1;
 408         } else if(*u < 0x800) {
 409                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 410                 n = 1;
 411         } else if(uc < 0x10000) {
 412                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 413                 n = 2;
 414         } else if(uc <= 0x10FFFF) {
 415                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 416                 n = 3;
 417         } else {
 418                 goto invalid;
 419         }
 420         for(i=n,++sp; i>0; --i,++sp)
 421                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 422         return n+1;
 423 invalid:
 424         /* U+FFFD */
 425         *s++ = '\xEF';
 426         *s++ = '\xBF';
 427         *s = '\xBD';
 428         return 3;
 429 }
 430
 431 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 432    UTF-8 otherwise return 0 */
 433 int
 434 isfullutf8(char *s, int b) {
 435         uchar *c1, *c2, *c3;
 436
 437         c1 = (uchar *) s;
 438         c2 = (uchar *) ++s;
 439         c3 = (uchar *) ++s;
 440         if(b < 1)
 441                 return 0;
 442         else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
 443                 return 0;
 444         else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 445             ((b == 1) ||
 446             ((b == 2) && (*c2&(B7|B6)) == B7)))
 447                 return 0;
 448         else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 449             ((b == 1) ||
 450             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 451             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
 452                 return 0;
 453         else
 454                 return 1;
 455 }
 456
 457 int
 458 utf8size(char *s) {
 459         uchar c = *s;
 460
 461         if(~c&B7)
 462                 return 1;
 463         else if((c&(B7|B6|B5)) == (B7|B6))
 464                 return 2;
 465         else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
 466                 return 3;
 467         else
 468                 return 4;
 469 }
 470
 471 void
 472 selinit(void) {
 473         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 474         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 475         sel.mode = 0;
 476         sel.bx = -1;
 477         sel.clip = NULL;
 478         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 479         if(sel.xtarget == None)
 480                 sel.xtarget = XA_STRING;
 481 }
 482
 483 static inline bool
 484 selected(int x, int y) {
 485         if(sel.ey == y && sel.by == y) {
 486                 int bx = MIN(sel.bx, sel.ex);
 487                 int ex = MAX(sel.bx, sel.ex);
 488                 return BETWEEN(x, bx, ex);
 489         }
 490         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 491                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 492 }
 493
 494 void
 495 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 496         if(b)
 497                 *b = e->xbutton.button;
 498
 499         *x = X2COL(e->xbutton.x);
 500         *y = Y2ROW(e->xbutton.y);
 501         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 502         sel.b.y = MIN(sel.by, sel.ey);
 503         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 504         sel.e.y = MAX(sel.by, sel.ey);
 505 }
 506
 507 void
 508 mousereport(XEvent *e) {
 509         int x = X2COL(e->xbutton.x);
 510         int y = Y2ROW(e->xbutton.y);
 511         int button = e->xbutton.button;
 512         int state = e->xbutton.state;
 513         char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
 514         static int ob, ox, oy;
 515
 516         /* from urxvt */
 517         if(e->xbutton.type == MotionNotify) {
 518                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 519                         return;
 520                 button = ob + 32;
 521                 ox = x, oy = y;
 522         } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
 523                 button = 3;
 524         } else {
 525                 button -= Button1;
 526                 if(button >= 3)
 527                         button += 64 - 3;
 528                 if(e->xbutton.type == ButtonPress) {
 529                         ob = button;
 530                         ox = x, oy = y;
 531                 }
 532         }
 533
 534         buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
 535                 + (state & Mod4Mask    ? 8  : 0)
 536                 + (state & ControlMask ? 16 : 0);
 537
 538         ttywrite(buf, sizeof(buf));
 539 }
 540
 541 void
 542 bpress(XEvent *e) {
 543         if(IS_SET(MODE_MOUSE))
 544                 mousereport(e);
 545         else if(e->xbutton.button == Button1) {
 546                 if(sel.bx != -1)
 547                         tsetdirt(sel.b.y, sel.e.y);
 548                 sel.mode = 1;
 549                 sel.ex = sel.bx = X2COL(e->xbutton.x);
 550                 sel.ey = sel.by = Y2ROW(e->xbutton.y);
 551         }
 552 }
 553
 554 void
 555 selcopy(void) {
 556         char *str, *ptr;
 557         int x, y, bufsize, is_selected = 0;
 558
 559         if(sel.bx == -1)
 560                 str = NULL;
 561
 562         else {
 563                 bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 564                 ptr = str = malloc(bufsize);
 565
 566                 /* append every set & selected glyph to the selection */
 567                 for(y = 0; y < term.row; y++) {
 568                         for(x = 0; x < term.col; x++) {
 569                                 is_selected = selected(x, y);
 570                                 if((term.line[y][x].state & GLYPH_SET) && is_selected) {
 571                                         int size = utf8size(term.line[y][x].c);
 572                                         memcpy(ptr, term.line[y][x].c, size);
 573                                         ptr += size;
 574                                 }
 575                         }
 576
 577                         /* \n at the end of every selected line except for the last one */
 578                         if(is_selected && y < sel.e.y)
 579                                 *ptr++ = '\n';
 580                 }
 581                 *ptr = 0;
 582         }
 583         sel.alt = IS_SET(MODE_ALTSCREEN);
 584         xsetsel(str);
 585 }
 586
 587 void
 588 selnotify(XEvent *e) {
 589         ulong nitems, ofs, rem;
 590         int format;
 591         uchar *data;
 592         Atom type;
 593
 594         ofs = 0;
 595         do {
 596                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 597                                         False, AnyPropertyType, &type, &format,
 598                                         &nitems, &rem, &data)) {
 599                         fprintf(stderr, "Clipboard allocation failed\n");
 600                         return;
 601                 }
 602                 ttywrite((const char *) data, nitems * format / 8);
 603                 XFree(data);
 604                 /* number of 32-bit chunks returned */
 605                 ofs += nitems * format / 32;
 606         } while(rem > 0);
 607 }
 608
 609 void
 610 selpaste() {
 611         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
 612 }
 613
 614 void
 615 selrequest(XEvent *e) {
 616         XSelectionRequestEvent *xsre;
 617         XSelectionEvent xev;
 618         Atom xa_targets;
 619
 620         xsre = (XSelectionRequestEvent *) e;
 621         xev.type = SelectionNotify;
 622         xev.requestor = xsre->requestor;
 623         xev.selection = xsre->selection;
 624         xev.target = xsre->target;
 625         xev.time = xsre->time;
 626         /* reject */
 627         xev.property = None;
 628
 629         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 630         if(xsre->target == xa_targets) {
 631                 /* respond with the supported type */
 632                 Atom string = sel.xtarget;
 633                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 634                                 XA_ATOM, 32, PropModeReplace,
 635                                 (uchar *) &string, 1);
 636                 xev.property = xsre->property;
 637         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 638                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 639                                 xsre->target, 8, PropModeReplace,
 640                                 (uchar *) sel.clip, strlen(sel.clip));
 641                 xev.property = xsre->property;
 642         }
 643
 644         /* all done, send a notification to the listener */
 645         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 646                 fprintf(stderr, "Error sending SelectionNotify event\n");
 647 }
 648
 649 void
 650 xsetsel(char *str) {
 651         /* register the selection for both the clipboard and the primary */
 652         Atom clipboard;
 653
 654         free(sel.clip);
 655         sel.clip = str;
 656
 657         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 658
 659         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 660         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 661
 662         XFlush(xw.dpy);
 663 }
 664
 665 void
 666 brelease(XEvent *e) {
 667         if(IS_SET(MODE_MOUSE)) {
 668                 mousereport(e);
 669                 return;
 670         }
 671         if(e->xbutton.button == Button2)
 672                 selpaste();
 673         else if(e->xbutton.button == Button1) {
 674                 sel.mode = 0;
 675                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 676                 term.dirty[sel.ey] = 1;
 677                 if(sel.bx == sel.ex && sel.by == sel.ey) {
 678                         struct timeval now;
 679                         sel.bx = -1;
 680                         gettimeofday(&now, NULL);
 681
 682                         if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
 683                                 /* triple click on the line */
 684                                 sel.b.x = sel.bx = 0;
 685                                 sel.e.x = sel.ex = term.col;
 686                                 sel.b.y = sel.e.y = sel.ey;
 687                                 selcopy();
 688                         } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
 689                                 /* double click to select word */
 690                                 sel.bx = sel.ex;
 691                                 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
 692                                           term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
 693                                 sel.b.x = sel.bx;
 694                                 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
 695                                           term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
 696                                 sel.e.x = sel.ex;
 697                                 sel.b.y = sel.e.y = sel.ey;
 698                                 selcopy();
 699                         }
 700                 } else
 701                         selcopy();
 702         }
 703         memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
 704         gettimeofday(&sel.tclick1, NULL);
 705         draw();
 706 }
 707
 708 void
 709 bmotion(XEvent *e) {
 710         if(IS_SET(MODE_MOUSE)) {
 711                 mousereport(e);
 712                 return;
 713         }
 714         if(sel.mode) {
 715                 int oldey = sel.ey, oldex = sel.ex;
 716                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 717
 718                 if(oldey != sel.ey || oldex != sel.ex) {
 719                         int starty = MIN(oldey, sel.ey);
 720                         int endy = MAX(oldey, sel.ey);
 721                         tsetdirt(starty, endy);
 722                         draw();
 723                 }
 724         }
 725 }
 726
 727 void
 728 die(const char *errstr, ...) {
 729         va_list ap;
 730
 731         va_start(ap, errstr);
 732         vfprintf(stderr, errstr, ap);
 733         va_end(ap);
 734         exit(EXIT_FAILURE);
 735 }
 736
 737 void
 738 execsh(void) {
 739         char **args;
 740         char *envshell = getenv("SHELL");
 741
 742         DEFAULT(envshell, SHELL);
 743         putenv("TERM="TNAME);
 744         args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
 745         execvp(args[0], args);
 746         exit(EXIT_FAILURE);
 747 }
 748
 749 void
 750 sigchld(int a) {
 751         int stat = 0;
 752         if(waitpid(pid, &stat, 0) < 0)
 753                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 754         if(WIFEXITED(stat))
 755                 exit(WEXITSTATUS(stat));
 756         else
 757                 exit(EXIT_FAILURE);
 758 }
 759
 760 void
 761 ttynew(void) {
 762         int m, s;
 763
 764         /* seems to work fine on linux, openbsd and freebsd */
 765         struct winsize w = {term.row, term.col, 0, 0};
 766         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 767                 die("openpty failed: %s\n", SERRNO);
 768
 769         switch(pid = fork()) {
 770         case -1:
 771                 die("fork failed\n");
 772                 break;
 773         case 0:
 774                 setsid(); /* create a new process group */
 775                 dup2(s, STDIN_FILENO);
 776                 dup2(s, STDOUT_FILENO);
 777                 dup2(s, STDERR_FILENO);
 778                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 779                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 780                 close(s);
 781                 close(m);
 782                 execsh();
 783                 break;
 784         default:
 785                 close(s);
 786                 cmdfd = m;
 787                 signal(SIGCHLD, sigchld);
 788                 if(opt_io && !(fileio = fopen(opt_io, "w"))) {
 789                         fprintf(stderr, "Error opening %s:%s\n",
 790                                 opt_io, strerror(errno));
 791                 }
 792         }
 793 }
 794
 795 void
 796 dump(char c) {
 797         static int col;
 798         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 799         if(++col % 10 == 0)
 800                 fprintf(stderr, "\n");
 801 }
 802
 803 void
 804 ttyread(void) {
 805         static char buf[BUFSIZ];
 806         static int buflen = 0;
 807         char *ptr;
 808         char s[UTF_SIZ];
 809         int charsize; /* size of utf8 char in bytes */
 810         long utf8c;
 811         int ret;
 812
 813         /* append read bytes to unprocessed bytes */
 814         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
 815                 die("Couldn't read from shell: %s\n", SERRNO);
 816
 817         /* process every complete utf8 char */
 818         buflen += ret;
 819         ptr = buf;
 820         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
 821                 charsize = utf8decode(ptr, &utf8c);
 822                 utf8encode(&utf8c, s);
 823                 tputc(s);
 824                 ptr    += charsize;
 825                 buflen -= charsize;
 826         }
 827
 828         /* keep any uncomplete utf8 char for the next call */
 829         memmove(buf, ptr, buflen);
 830 }
 831
 832 void
 833 ttywrite(const char *s, size_t n) {
 834         if(write(cmdfd, s, n) == -1)
 835                 die("write error on tty: %s\n", SERRNO);
 836 }
 837
 838 void
 839 ttyresize(int x, int y) {
 840         struct winsize w;
 841
 842         w.ws_row = term.row;
 843         w.ws_col = term.col;
 844         w.ws_xpixel = xw.w;
 845         w.ws_ypixel = xw.h;
 846         w.ws_xpixel = w.ws_ypixel = 0;
 847         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 848                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 849 }
 850
 851 void
 852 tsetdirt(int top, int bot)
 853 {
 854         int i;
 855
 856         LIMIT(top, 0, term.row-1);
 857         LIMIT(bot, 0, term.row-1);
 858
 859         for(i = top; i <= bot; i++)
 860                 term.dirty[i] = 1;
 861 }
 862
 863 void
 864 tfulldirt(void)
 865 {
 866         tsetdirt(0, term.row-1);
 867 }
 868
 869 void
 870 tcursor(int mode) {
 871         static TCursor c;
 872
 873         if(mode == CURSOR_SAVE)
 874                 c = term.c;
 875         else if(mode == CURSOR_LOAD)
 876                 term.c = c, tmoveto(c.x, c.y);
 877 }
 878
 879 void
 880 treset(void) {
 881         unsigned i;
 882         term.c = (TCursor){{
 883                 .mode = ATTR_NULL,
 884                 .fg = DefaultFG,
 885                 .bg = DefaultBG
 886         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 887
 888         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 889         for(i = TAB; i < term.col; i += TAB)
 890                 term.tabs[i] = 1;
 891         term.top = 0, term.bot = term.row - 1;
 892         term.mode = MODE_WRAP;
 893         tclearregion(0, 0, term.col-1, term.row-1);
 894 }
 895
 896 void
 897 tnew(int col, int row) {
 898         /* set screen size */
 899         term.row = row, term.col = col;
 900         term.line = malloc(term.row * sizeof(Line));
 901         term.alt  = malloc(term.row * sizeof(Line));
 902         term.dirty = malloc(term.row * sizeof(*term.dirty));
 903         term.tabs = malloc(term.col * sizeof(*term.tabs));
 904
 905         for(row = 0; row < term.row; row++) {
 906                 term.line[row] = malloc(term.col * sizeof(Glyph));
 907                 term.alt [row] = malloc(term.col * sizeof(Glyph));
 908                 term.dirty[row] = 0;
 909         }
 910         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 911         /* setup screen */
 912         treset();
 913 }
 914
 915 void
 916 tswapscreen(void) {
 917         Line* tmp = term.line;
 918         term.line = term.alt;
 919         term.alt = tmp;
 920         term.mode ^= MODE_ALTSCREEN;
 921         tfulldirt();
 922 }
 923
 924 void
 925 tscrolldown(int orig, int n) {
 926         int i;
 927         Line temp;
 928
 929         LIMIT(n, 0, term.bot-orig+1);
 930
 931         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 932
 933         for(i = term.bot; i >= orig+n; i--) {
 934                 temp = term.line[i];
 935                 term.line[i] = term.line[i-n];
 936                 term.line[i-n] = temp;
 937
 938                 term.dirty[i] = 1;
 939                 term.dirty[i-n] = 1;
 940         }
 941
 942         selscroll(orig, n);
 943 }
 944
 945 void
 946 tscrollup(int orig, int n) {
 947         int i;
 948         Line temp;
 949         LIMIT(n, 0, term.bot-orig+1);
 950
 951         tclearregion(0, orig, term.col-1, orig+n-1);
 952
 953         for(i = orig; i <= term.bot-n; i++) {
 954                  temp = term.line[i];
 955                  term.line[i] = term.line[i+n];
 956                  term.line[i+n] = temp;
 957
 958                  term.dirty[i] = 1;
 959                  term.dirty[i+n] = 1;
 960         }
 961
 962         selscroll(orig, -n);
 963 }
 964
 965 void
 966 selscroll(int orig, int n) {
 967         if(sel.bx == -1)
 968                 return;
 969
 970         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
 971                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
 972                         sel.bx = -1;
 973                         return;
 974                 }
 975                 if(sel.by < term.top) {
 976                         sel.by = term.top;
 977                         sel.bx = 0;
 978                 }
 979                 if(sel.ey > term.bot) {
 980                         sel.ey = term.bot;
 981                         sel.ex = term.col;
 982                 }
 983                 sel.b.y = sel.by, sel.b.x = sel.bx;
 984                 sel.e.y = sel.ey, sel.e.x = sel.ex;
 985         }
 986 }
 987
 988 void
 989 tnewline(int first_col) {
 990         int y = term.c.y;
 991         if(y == term.bot)
 992                 tscrollup(term.top, 1);
 993         else
 994                 y++;
 995         tmoveto(first_col ? 0 : term.c.x, y);
 996 }
 997
 998 void
 999 csiparse(void) {
1000         /* int noarg = 1; */
1001         char *p = csiescseq.buf;
1002
1003         csiescseq.narg = 0;
1004         if(*p == '?')
1005                 csiescseq.priv = 1, p++;
1006
1007         while(p < csiescseq.buf+csiescseq.len) {
1008                 while(isdigit(*p)) {
1009                         csiescseq.arg[csiescseq.narg] *= 10;
1010                         csiescseq.arg[csiescseq.narg] += *p++ - '0'/*, noarg = 0 */;
1011                 }
1012                 if(*p == ';' && csiescseq.narg+1 < ESC_ARG_SIZ)
1013                         csiescseq.narg++, p++;
1014                 else {
1015                         csiescseq.mode = *p;
1016                         csiescseq.narg++;
1017                         return;
1018                 }
1019         }
1020 }
1021
1022 void
1023 tmoveto(int x, int y) {
1024         LIMIT(x, 0, term.col-1);
1025         LIMIT(y, 0, term.row-1);
1026         term.c.state &= ~CURSOR_WRAPNEXT;
1027         term.c.x = x;
1028         term.c.y = y;
1029 }
1030
1031 void
1032 tsetchar(char *c) {
1033         term.dirty[term.c.y] = 1;
1034         term.line[term.c.y][term.c.x] = term.c.attr;
1035         memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
1036         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
1037 }
1038
1039 void
1040 tclearregion(int x1, int y1, int x2, int y2) {
1041         int x, y, temp;
1042
1043         if(x1 > x2)
1044                 temp = x1, x1 = x2, x2 = temp;
1045         if(y1 > y2)
1046                 temp = y1, y1 = y2, y2 = temp;
1047
1048         LIMIT(x1, 0, term.col-1);
1049         LIMIT(x2, 0, term.col-1);
1050         LIMIT(y1, 0, term.row-1);
1051         LIMIT(y2, 0, term.row-1);
1052
1053         for(y = y1; y <= y2; y++) {
1054                 term.dirty[y] = 1;
1055                 for(x = x1; x <= x2; x++)
1056                         term.line[y][x].state = 0;
1057         }
1058 }
1059
1060 void
1061 tdeletechar(int n) {
1062         int src = term.c.x + n;
1063         int dst = term.c.x;
1064         int size = term.col - src;
1065
1066         term.dirty[term.c.y] = 1;
1067
1068         if(src >= term.col) {
1069                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1070                 return;
1071         }
1072         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1073         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1074 }
1075
1076 void
1077 tinsertblank(int n) {
1078         int src = term.c.x;
1079         int dst = src + n;
1080         int size = term.col - dst;
1081
1082         term.dirty[term.c.y] = 1;
1083
1084         if(dst >= term.col) {
1085                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1086                 return;
1087         }
1088         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1089         tclearregion(src, term.c.y, dst - 1, term.c.y);
1090 }
1091
1092 void
1093 tinsertblankline(int n) {
1094         if(term.c.y < term.top || term.c.y > term.bot)
1095                 return;
1096
1097         tscrolldown(term.c.y, n);
1098 }
1099
1100 void
1101 tdeleteline(int n) {
1102         if(term.c.y < term.top || term.c.y > term.bot)
1103                 return;
1104
1105         tscrollup(term.c.y, n);
1106 }
1107
1108 void
1109 tsetattr(int *attr, int l) {
1110         int i;
1111
1112         for(i = 0; i < l; i++) {
1113                 switch(attr[i]) {
1114                 case 0:
1115                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
1116                         term.c.attr.fg = DefaultFG;
1117                         term.c.attr.bg = DefaultBG;
1118                         break;
1119                 case 1:
1120                         term.c.attr.mode |= ATTR_BOLD;
1121                         break;
1122                 case 3: /* enter standout (highlight) mode TODO: make it italic */
1123                         term.c.attr.mode |= ATTR_REVERSE;
1124                         break;
1125                 case 4:
1126                         term.c.attr.mode |= ATTR_UNDERLINE;
1127                         break;
1128                 case 7:
1129                         term.c.attr.mode |= ATTR_REVERSE;
1130                         break;
1131                 case 22:
1132                         term.c.attr.mode &= ~ATTR_BOLD;
1133                         break;
1134                 case 23: /* leave standout (highlight) mode TODO: make it italic */
1135                         term.c.attr.mode &= ~ATTR_REVERSE;
1136                         break;
1137                 case 24:
1138                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1139                         break;
1140                 case 27:
1141                         term.c.attr.mode &= ~ATTR_REVERSE;
1142                         break;
1143                 case 38:
1144                         if(i + 2 < l && attr[i + 1] == 5) {
1145                                 i += 2;
1146                                 if(BETWEEN(attr[i], 0, 255))
1147                                         term.c.attr.fg = attr[i];
1148                                 else
1149                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
1150                         }
1151                         else
1152                                 fprintf(stderr, "erresc(38): gfx attr %d unknown\n", attr[i]);
1153                         break;
1154                 case 39:
1155                         term.c.attr.fg = DefaultFG;
1156                         break;
1157                 case 48:
1158                         if(i + 2 < l && attr[i + 1] == 5) {
1159                                 i += 2;
1160                                 if(BETWEEN(attr[i], 0, 255))
1161                                         term.c.attr.bg = attr[i];
1162                                 else
1163                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
1164                         }
1165                         else
1166                                 fprintf(stderr, "erresc(48): gfx attr %d unknown\n", attr[i]);
1167                         break;
1168                 case 49:
1169                         term.c.attr.bg = DefaultBG;
1170                         break;
1171                 default:
1172                         if(BETWEEN(attr[i], 30, 37))
1173                                 term.c.attr.fg = attr[i] - 30;
1174                         else if(BETWEEN(attr[i], 40, 47))
1175                                 term.c.attr.bg = attr[i] - 40;
1176                         else if(BETWEEN(attr[i], 90, 97))
1177                                 term.c.attr.fg = attr[i] - 90 + 8;
1178                         else if(BETWEEN(attr[i], 100, 107))
1179                                 term.c.attr.fg = attr[i] - 100 + 8;
1180                         else
1181                                 fprintf(stderr, "erresc(default): gfx attr %d unknown\n", attr[i]), csidump();
1182                         break;
1183                 }
1184         }
1185 }
1186
1187 void
1188 tsetscroll(int t, int b) {
1189         int temp;
1190
1191         LIMIT(t, 0, term.row-1);
1192         LIMIT(b, 0, term.row-1);
1193         if(t > b) {
1194                 temp = t;
1195                 t = b;
1196                 b = temp;
1197         }
1198         term.top = t;
1199         term.bot = b;
1200 }
1201
1202 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1203
1204 void
1205 tsetmode(bool priv, bool set, int *args, int narg) {
1206         int *lim, mode;
1207
1208         for(lim = args + narg; args < lim; ++args) {
1209                 if(priv) {
1210                         switch(*args) {
1211                         case 1:
1212                                 MODBIT(term.mode, set, MODE_APPKEYPAD);
1213                                 break;
1214                         case 5: /* DECSCNM -- Reverve video */
1215                                 mode = term.mode;
1216                                 MODBIT(term.mode,set, MODE_REVERSE);
1217                                 if(mode != term.mode)
1218                                         redraw();
1219                                 break;
1220                         case 7:
1221                                 MODBIT(term.mode, set, MODE_WRAP);
1222                                 break;
1223                         case 20:
1224                                 MODBIT(term.mode, set, MODE_CRLF);
1225                                 break;
1226                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1227                                 break;
1228                         case 25:
1229                                 MODBIT(term.c.state, !set, CURSOR_HIDE);
1230                                 break;
1231                         case 1000: /* 1000,1002: enable xterm mouse report */
1232                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1233                                 break;
1234                         case 1002:
1235                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1236                                 break;
1237                         case 1049: /* = 1047 and 1048 */
1238                         case 47:
1239                         case 1047:
1240                                 if(IS_SET(MODE_ALTSCREEN))
1241                                         tclearregion(0, 0, term.col-1, term.row-1);
1242                                 if((set && !IS_SET(MODE_ALTSCREEN)) ||
1243                                     (!set && IS_SET(MODE_ALTSCREEN))) {
1244                                             tswapscreen();
1245                                 }
1246                                 if(*args != 1049)
1247                                         break;
1248                                 /* pass through */
1249                         case 1048:
1250                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1251                                 break;
1252                         default:
1253                                 fprintf(stderr,
1254                                         "erresc: unknown private set/reset mode %d\n",
1255                                         *args);
1256                                 break;
1257                         }
1258                 } else {
1259                         switch(*args) {
1260                         case 4:
1261                                 MODBIT(term.mode, set, MODE_INSERT);
1262                                 break;
1263                         default:
1264                                 fprintf(stderr,
1265                                         "erresc: unknown set/reset mode %d\n",
1266                                         *args);
1267                                 break;
1268                         }
1269                 }
1270         }
1271 }
1272 #undef MODBIT
1273
1274
1275 void
1276 csihandle(void) {
1277         switch(csiescseq.mode) {
1278         default:
1279         unknown:
1280                 fprintf(stderr, "erresc: unknown csi ");
1281                 csidump();
1282                 /* die(""); */
1283                 break;
1284         case '@': /* ICH -- Insert <n> blank char */
1285                 DEFAULT(csiescseq.arg[0], 1);
1286                 tinsertblank(csiescseq.arg[0]);
1287                 break;
1288         case 'A': /* CUU -- Cursor <n> Up */
1289         case 'e':
1290                 DEFAULT(csiescseq.arg[0], 1);
1291                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1292                 break;
1293         case 'B': /* CUD -- Cursor <n> Down */
1294                 DEFAULT(csiescseq.arg[0], 1);
1295                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1296                 break;
1297         case 'C': /* CUF -- Cursor <n> Forward */
1298         case 'a':
1299                 DEFAULT(csiescseq.arg[0], 1);
1300                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1301                 break;
1302         case 'D': /* CUB -- Cursor <n> Backward */
1303                 DEFAULT(csiescseq.arg[0], 1);
1304                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1305                 break;
1306         case 'E': /* CNL -- Cursor <n> Down and first col */
1307                 DEFAULT(csiescseq.arg[0], 1);
1308                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1309                 break;
1310         case 'F': /* CPL -- Cursor <n> Up and first col */
1311                 DEFAULT(csiescseq.arg[0], 1);
1312                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1313                 break;
1314         case 'g': /* TBC -- Tabulation clear */
1315                 switch (csiescseq.arg[0]) {
1316                 case 0: /* clear current tab stop */
1317                         term.tabs[term.c.x] = 0;
1318                         break;
1319                 case 3: /* clear all the tabs */
1320                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1321                         break;
1322                 default:
1323                         goto unknown;
1324                 }
1325                 break;
1326         case 'G': /* CHA -- Move to <col> */
1327         case '`': /* HPA */
1328                 DEFAULT(csiescseq.arg[0], 1);
1329                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1330                 break;
1331         case 'H': /* CUP -- Move to <row> <col> */
1332         case 'f': /* HVP */
1333                 DEFAULT(csiescseq.arg[0], 1);
1334                 DEFAULT(csiescseq.arg[1], 1);
1335                 tmoveto(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1336                 break;
1337         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1338                 DEFAULT(csiescseq.arg[0], 1);
1339                 while(csiescseq.arg[0]--)
1340                         tputtab(1);
1341                 break;
1342         case 'J': /* ED -- Clear screen */
1343                 sel.bx = -1;
1344                 switch(csiescseq.arg[0]) {
1345                 case 0: /* below */
1346                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1347                         if(term.c.y < term.row-1)
1348                                 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1349                         break;
1350                 case 1: /* above */
1351                         if(term.c.y > 1)
1352                                 tclearregion(0, 0, term.col-1, term.c.y-1);
1353                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1354                         break;
1355                 case 2: /* all */
1356                         tclearregion(0, 0, term.col-1, term.row-1);
1357                         break;
1358                 default:
1359                         goto unknown;
1360                 }
1361                 break;
1362         case 'K': /* EL -- Clear line */
1363                 switch(csiescseq.arg[0]) {
1364                 case 0: /* right */
1365                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1366                         break;
1367                 case 1: /* left */
1368                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1369                         break;
1370                 case 2: /* all */
1371                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1372                         break;
1373                 }
1374                 break;
1375         case 'S': /* SU -- Scroll <n> line up */
1376                 DEFAULT(csiescseq.arg[0], 1);
1377                 tscrollup(term.top, csiescseq.arg[0]);
1378                 break;
1379         case 'T': /* SD -- Scroll <n> line down */
1380                 DEFAULT(csiescseq.arg[0], 1);
1381                 tscrolldown(term.top, csiescseq.arg[0]);
1382                 break;
1383         case 'L': /* IL -- Insert <n> blank lines */
1384                 DEFAULT(csiescseq.arg[0], 1);
1385                 tinsertblankline(csiescseq.arg[0]);
1386                 break;
1387         case 'l': /* RM -- Reset Mode */
1388                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1389                 break;
1390         case 'M': /* DL -- Delete <n> lines */
1391                 DEFAULT(csiescseq.arg[0], 1);
1392                 tdeleteline(csiescseq.arg[0]);
1393                 break;
1394         case 'X': /* ECH -- Erase <n> char */
1395                 DEFAULT(csiescseq.arg[0], 1);
1396                 tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0], term.c.y);
1397                 break;
1398         case 'P': /* DCH -- Delete <n> char */
1399                 DEFAULT(csiescseq.arg[0], 1);
1400                 tdeletechar(csiescseq.arg[0]);
1401                 break;
1402         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1403                 DEFAULT(csiescseq.arg[0], 1);
1404                 while(csiescseq.arg[0]--)
1405                         tputtab(0);
1406                 break;
1407         case 'd': /* VPA -- Move to <row> */
1408                 DEFAULT(csiescseq.arg[0], 1);
1409                 tmoveto(term.c.x, csiescseq.arg[0]-1);
1410                 break;
1411         case 'h': /* SM -- Set terminal mode */
1412                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1413                 break;
1414         case 'm': /* SGR -- Terminal attribute (color) */
1415                 tsetattr(csiescseq.arg, csiescseq.narg);
1416                 break;
1417         case 'r': /* DECSTBM -- Set Scrolling Region */
1418                 if(csiescseq.priv)
1419                         goto unknown;
1420                 else {
1421                         DEFAULT(csiescseq.arg[0], 1);
1422                         DEFAULT(csiescseq.arg[1], term.row);
1423                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1424                         tmoveto(0, 0);
1425                 }
1426                 break;
1427         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1428                 tcursor(CURSOR_SAVE);
1429                 break;
1430         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1431                 tcursor(CURSOR_LOAD);
1432                 break;
1433         }
1434 }
1435
1436 void
1437 csidump(void) {
1438         int i;
1439         printf("ESC[");
1440         for(i = 0; i < csiescseq.len; i++) {
1441                 uint c = csiescseq.buf[i] & 0xff;
1442                 if(isprint(c)) putchar(c);
1443                 else if(c == '\n') printf("(\\n)");
1444                 else if(c == '\r') printf("(\\r)");
1445                 else if(c == 0x1b) printf("(\\e)");
1446                 else printf("(%02x)", c);
1447         }
1448         putchar('\n');
1449 }
1450
1451 void
1452 csireset(void) {
1453         memset(&csiescseq, 0, sizeof(csiescseq));
1454 }
1455
1456 void
1457 strhandle(void) {
1458         char *p;
1459
1460         /*
1461          * TODO: make this being useful in case of color palette change.
1462          */
1463         strparse();
1464
1465         p = strescseq.buf;
1466
1467         switch(strescseq.type) {
1468         case ']': /* OSC -- Operating System Command */
1469                 switch(p[0]) {
1470                 case '0':
1471                 case '1':
1472                 case '2':
1473                         /*
1474                          * TODO: Handle special chars in string, like umlauts.
1475                          */
1476                         if(p[1] == ';') {
1477                                 XStoreName(xw.dpy, xw.win, strescseq.buf+2);
1478                         }
1479                         break;
1480                 case ';':
1481                         XStoreName(xw.dpy, xw.win, strescseq.buf+1);
1482                         break;
1483                 case '4': /* TODO: Set color (arg0) to "rgb:%hexr/$hexg/$hexb" (arg1) */
1484                         break;
1485                 default:
1486                         fprintf(stderr, "erresc: unknown str ");
1487                         strdump();
1488                         break;
1489                 }
1490                 break;
1491         case 'P': /* DSC -- Device Control String */
1492         case '_': /* APC -- Application Program Command */
1493         case '^': /* PM -- Privacy Message */
1494         default:
1495                 fprintf(stderr, "erresc: unknown str ");
1496                 strdump();
1497                 /* die(""); */
1498                 break;
1499         }
1500 }
1501
1502 void
1503 strparse(void) {
1504         /*
1505          * TODO: Implement parsing like for CSI when required.
1506          * Format: ESC type cmd ';' arg0 [';' argn] ESC \
1507          */
1508         return;
1509 }
1510
1511 void
1512 strdump(void) {
1513         int i;
1514         printf("ESC%c", strescseq.type);
1515         for(i = 0; i < strescseq.len; i++) {
1516                 uint c = strescseq.buf[i] & 0xff;
1517                 if(isprint(c)) putchar(c);
1518                 else if(c == '\n') printf("(\\n)");
1519                 else if(c == '\r') printf("(\\r)");
1520                 else if(c == 0x1b) printf("(\\e)");
1521                 else printf("(%02x)", c);
1522         }
1523         printf("ESC\\\n");
1524 }
1525
1526 void
1527 strreset(void) {
1528         memset(&strescseq, 0, sizeof(strescseq));
1529 }
1530
1531 void
1532 tputtab(bool forward) {
1533         unsigned x = term.c.x;
1534
1535         if(forward) {
1536                 if(x == term.col)
1537                         return;
1538                 for(++x; x < term.col && !term.tabs[x]; ++x)
1539                         /* nothing */ ;
1540         } else {
1541                 if(x == 0)
1542                         return;
1543                 for(--x; x > 0 && !term.tabs[x]; --x)
1544                         /* nothing */ ;
1545         }
1546         tmoveto(x, term.c.y);
1547 }
1548
1549 void
1550 tputc(char *c) {
1551         char ascii = *c;
1552
1553         if(fileio)
1554                 putc(ascii, fileio);
1555
1556         if(term.esc & ESC_START) {
1557                 if(term.esc & ESC_CSI) {
1558                         csiescseq.buf[csiescseq.len++] = ascii;
1559                         if(BETWEEN(ascii, 0x40, 0x7E) || csiescseq.len >= ESC_BUF_SIZ) {
1560                                 term.esc = 0;
1561                                 csiparse(), csihandle();
1562                         }
1563                 } else if(term.esc & ESC_STR) {
1564                         switch(ascii) {
1565                         case '\033':
1566                                 term.esc = ESC_START | ESC_STR_END;
1567                                 break;
1568                         case '\a': /* backwards compatibility to xterm */
1569                                 term.esc = 0;
1570                                 strhandle();
1571                                 break;
1572                         default:
1573                                 strescseq.buf[strescseq.len++] = ascii;
1574                                 if(strescseq.len+1 >= STR_BUF_SIZ) {
1575                                         term.esc = 0;
1576                                         strhandle();
1577                                 }
1578                         }
1579                 } else if(term.esc & ESC_STR_END) {
1580                         term.esc = 0;
1581                         if(ascii == '\\')
1582                                 strhandle();
1583                 } else if(term.esc & ESC_ALTCHARSET) {
1584                         switch(ascii) {
1585                         case '0': /* Line drawing crap */
1586                                 term.c.attr.mode |= ATTR_GFX;
1587                                 break;
1588                         case 'B': /* Back to regular text */
1589                                 term.c.attr.mode &= ~ATTR_GFX;
1590                                 break;
1591                         default:
1592                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1593                         }
1594                         term.esc = 0;
1595                 } else {
1596                         switch(ascii) {
1597                         case '[':
1598                                 term.esc |= ESC_CSI;
1599                                 break;
1600                         case 'P': /* DCS -- Device Control String */
1601                         case '_': /* APC -- Application Program Command */
1602                         case '^': /* PM -- Privacy Message */
1603                         case ']': /* OSC -- Operating System Command */
1604                                 strreset();
1605                                 strescseq.type = ascii;
1606                                 term.esc |= ESC_STR;
1607                                 break;
1608                         case '(':
1609                                 term.esc |= ESC_ALTCHARSET;
1610                                 break;
1611                         case 'D': /* IND -- Linefeed */
1612                                 if(term.c.y == term.bot)
1613                                         tscrollup(term.top, 1);
1614                                 else
1615                                         tmoveto(term.c.x, term.c.y+1);
1616                                 term.esc = 0;
1617                                 break;
1618                         case 'E': /* NEL -- Next line */
1619                                 tnewline(1); /* always go to first col */
1620                                 term.esc = 0;
1621                                 break;
1622                         case 'H': /* HTS -- Horizontal tab stop */
1623                                 term.tabs[term.c.x] = 1;
1624                                 term.esc = 0;
1625                                 break;
1626                         case 'M': /* RI -- Reverse index */
1627                                 if(term.c.y == term.top)
1628                                         tscrolldown(term.top, 1);
1629                                 else
1630                                         tmoveto(term.c.x, term.c.y-1);
1631                                 term.esc = 0;
1632                                 break;
1633                         case 'c': /* RIS -- Reset to inital state */
1634                                 treset();
1635                                 term.esc = 0;
1636                                 break;
1637                         case '=': /* DECPAM -- Application keypad */
1638                                 term.mode |= MODE_APPKEYPAD;
1639                                 term.esc = 0;
1640                                 break;
1641                         case '>': /* DECPNM -- Normal keypad */
1642                                 term.mode &= ~MODE_APPKEYPAD;
1643                                 term.esc = 0;
1644                                 break;
1645                         case '7': /* DECSC -- Save Cursor */
1646                                 tcursor(CURSOR_SAVE);
1647                                 term.esc = 0;
1648                                 break;
1649                         case '8': /* DECRC -- Restore Cursor */
1650                                 tcursor(CURSOR_LOAD);
1651                                 term.esc = 0;
1652                                 break;
1653                         case '\\': /* ST -- Stop */
1654                                 term.esc = 0;
1655                                 break;
1656                         default:
1657                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1658                                     (uchar) ascii, isprint(ascii)?ascii:'.');
1659                                 term.esc = 0;
1660                         }
1661                 }
1662         } else {
1663                 if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
1664                         sel.bx = -1;
1665                 switch(ascii) {
1666                 case '\t':
1667                         tputtab(1);
1668                         break;
1669                 case '\b':
1670                         tmoveto(term.c.x-1, term.c.y);
1671                         break;
1672                 case '\r':
1673                         tmoveto(0, term.c.y);
1674                         break;
1675                 case '\f':
1676                 case '\v':
1677                 case '\n':
1678                         /* go to first col if the mode is set */
1679                         tnewline(IS_SET(MODE_CRLF));
1680                         break;
1681                 case '\a':
1682                         if(!(xw.state & WIN_FOCUSED))
1683                                 xseturgency(1);
1684                         break;
1685                 case '\033':
1686                         csireset();
1687                         term.esc = ESC_START;
1688                         break;
1689                 default:
1690                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1691                                 tnewline(1); /* always go to first col */
1692                         tsetchar(c);
1693                         if(term.c.x+1 < term.col)
1694                                 tmoveto(term.c.x+1, term.c.y);
1695                         else
1696                                 term.c.state |= CURSOR_WRAPNEXT;
1697                 }
1698         }
1699 }
1700
1701 int
1702 tresize(int col, int row) {
1703         int i, x;
1704         int minrow = MIN(row, term.row);
1705         int mincol = MIN(col, term.col);
1706         int slide = term.c.y - row + 1;
1707
1708         if(col < 1 || row < 1)
1709                 return 0;
1710
1711         /* free unneeded rows */
1712         i = 0;
1713         if(slide > 0) {
1714                 /* slide screen to keep cursor where we expect it -
1715                  * tscrollup would work here, but we can optimize to
1716                  * memmove because we're freeing the earlier lines */
1717                 for(/* i = 0 */; i < slide; i++) {
1718                         free(term.line[i]);
1719                         free(term.alt[i]);
1720                 }
1721                 memmove(term.line, term.line + slide, row * sizeof(Line));
1722                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1723         }
1724         for(i += row; i < term.row; i++) {
1725                 free(term.line[i]);
1726                 free(term.alt[i]);
1727         }
1728
1729         /* resize to new height */
1730         term.line = realloc(term.line, row * sizeof(Line));
1731         term.alt  = realloc(term.alt,  row * sizeof(Line));
1732         term.dirty = realloc(term.dirty, row * sizeof(*term.dirty));
1733         term.tabs = realloc(term.tabs, col * sizeof(*term.tabs));
1734
1735         /* resize each row to new width, zero-pad if needed */
1736         for(i = 0; i < minrow; i++) {
1737                 term.dirty[i] = 1;
1738                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1739                 term.alt[i]  = realloc(term.alt[i],  col * sizeof(Glyph));
1740                 for(x = mincol; x < col; x++) {
1741                         term.line[i][x].state = 0;
1742                         term.alt[i][x].state = 0;
1743                 }
1744         }
1745
1746         /* allocate any new rows */
1747         for(/* i == minrow */; i < row; i++) {
1748                 term.dirty[i] = 1;
1749                 term.line[i] = calloc(col, sizeof(Glyph));
1750                 term.alt [i] = calloc(col, sizeof(Glyph));
1751         }
1752         if(col > term.col) {
1753                 bool *bp = term.tabs + term.col;
1754
1755                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
1756                 while(--bp > term.tabs && !*bp)
1757                         /* nothing */ ;
1758                 for(bp += TAB; bp < term.tabs + col; bp += TAB)
1759                         *bp = 1;
1760         }
1761         /* update terminal size */
1762         term.col = col, term.row = row;
1763         /* make use of the LIMIT in tmoveto */
1764         tmoveto(term.c.x, term.c.y);
1765         /* reset scrolling region */
1766         tsetscroll(0, row-1);
1767
1768         return (slide > 0);
1769 }
1770
1771 void
1772 xresize(int col, int row) {
1773         xw.w = MAX(1, 2*BORDER + col * xw.cw);
1774         xw.h = MAX(1, 2*BORDER + row * xw.ch);
1775 }
1776
1777 void
1778 xloadcols(void) {
1779         int i, r, g, b;
1780         XColor color;
1781         ulong white = WhitePixel(xw.dpy, xw.scr);
1782
1783         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
1784         for(i = 0; i < LEN(colorname); i++) {
1785                 if(!colorname[i])
1786                         continue;
1787                 if(!XAllocNamedColor(xw.dpy, xw.cmap, colorname[i], &color, &color)) {
1788                         dc.col[i] = white;
1789                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1790                 } else
1791                         dc.col[i] = color.pixel;
1792         }
1793
1794         /* load colors [16-255] ; same colors as xterm */
1795         for(i = 16, r = 0; r < 6; r++)
1796                 for(g = 0; g < 6; g++)
1797                         for(b = 0; b < 6; b++) {
1798                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1799                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1800                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1801                                 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1802                                         dc.col[i] = white;
1803                                         fprintf(stderr, "Could not allocate color %d\n", i);
1804                                 } else
1805                                         dc.col[i] = color.pixel;
1806                                 i++;
1807                         }
1808
1809         for(r = 0; r < 24; r++, i++) {
1810                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1811                 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1812                         dc.col[i] = white;
1813                         fprintf(stderr, "Could not allocate color %d\n", i);
1814                 } else
1815                         dc.col[i] = color.pixel;
1816         }
1817 }
1818
1819 void
1820 xclear(int x1, int y1, int x2, int y2) {
1821         XSetForeground(xw.dpy, dc.gc, dc.col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG]);
1822         XFillRectangle(xw.dpy, xw.buf, dc.gc,
1823                        BORDER + x1 * xw.cw, BORDER + y1 * xw.ch,
1824                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1825 }
1826
1827 void
1828 xhints(void) {
1829         XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
1830         XWMHints wm = {.flags = InputHint, .input = 1};
1831         XSizeHints *sizeh = NULL;
1832
1833         sizeh = XAllocSizeHints();
1834         if(xw.isfixed == False) {
1835                 sizeh->flags = PSize | PResizeInc | PBaseSize;
1836                 sizeh->height = xw.h;
1837                 sizeh->width = xw.w;
1838                 sizeh->height_inc = xw.ch;
1839                 sizeh->width_inc = xw.cw;
1840                 sizeh->base_height = 2*BORDER;
1841                 sizeh->base_width = 2*BORDER;
1842         } else {
1843                 sizeh->flags = PMaxSize | PMinSize;
1844                 sizeh->min_width = sizeh->max_width = xw.fw;
1845                 sizeh->min_height = sizeh->max_height = xw.fh;
1846         }
1847
1848         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
1849         XFree(sizeh);
1850 }
1851
1852 XFontSet
1853 xinitfont(char *fontstr) {
1854         XFontSet set;
1855         char *def, **missing;
1856         int n;
1857
1858         missing = NULL;
1859         set = XCreateFontSet(xw.dpy, fontstr, &missing, &n, &def);
1860         if(missing) {
1861                 while(n--)
1862                         fprintf(stderr, "st: missing fontset: %s\n", missing[n]);
1863                 XFreeStringList(missing);
1864         }
1865         return set;
1866 }
1867
1868 void
1869 xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rbearing) {
1870         XFontStruct **xfonts;
1871         char **font_names;
1872         int i, n;
1873
1874         *ascent = *descent = *lbearing = *rbearing = 0;
1875         n = XFontsOfFontSet(set, &xfonts, &font_names);
1876         for(i = 0; i < n; i++) {
1877                 *ascent = MAX(*ascent, (*xfonts)->ascent);
1878                 *descent = MAX(*descent, (*xfonts)->descent);
1879                 *lbearing = MAX(*lbearing, (*xfonts)->min_bounds.lbearing);
1880                 *rbearing = MAX(*rbearing, (*xfonts)->max_bounds.rbearing);
1881                 xfonts++;
1882         }
1883 }
1884
1885 void
1886 initfonts(char *fontstr, char *bfontstr) {
1887         if((dc.font.set = xinitfont(fontstr)) == NULL ||
1888            (dc.bfont.set = xinitfont(bfontstr)) == NULL)
1889                 die("Can't load font %s\n", dc.font.set ? BOLDFONT : FONT);
1890         xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1891             &dc.font.lbearing, &dc.font.rbearing);
1892         xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1893             &dc.bfont.lbearing, &dc.bfont.rbearing);
1894 }
1895
1896 void
1897 xinit(void) {
1898         XSetWindowAttributes attrs;
1899         Cursor cursor;
1900         Window parent;
1901         int sw, sh;
1902
1903         if(!(xw.dpy = XOpenDisplay(NULL)))
1904                 die("Can't open display\n");
1905         xw.scr = XDefaultScreen(xw.dpy);
1906
1907         /* adjust fixed window geometry */
1908         if(xw.isfixed) {
1909                 sw = DisplayWidth(xw.dpy, xw.scr);
1910                 sh = DisplayHeight(xw.dpy, xw.scr);
1911                 if(xw.fx < 0)
1912                         xw.fx = sw + xw.fx - xw.fw - 1;
1913                 if(xw.fy < 0)
1914                         xw.fy = sh + xw.fy - xw.fh - 1;
1915
1916                 xw.h = xw.fh;
1917                 xw.w = xw.fw;
1918         } else {
1919                 /* window - default size */
1920                 xw.h = 2*BORDER + term.row * xw.ch;
1921                 xw.w = 2*BORDER + term.col * xw.cw;
1922                 xw.fx = 0;
1923                 xw.fy = 0;
1924         }
1925
1926         /* font */
1927         initfonts(FONT, BOLDFONT);
1928
1929         /* XXX: Assuming same size for bold font */
1930         xw.cw = dc.font.rbearing - dc.font.lbearing;
1931         xw.ch = dc.font.ascent + dc.font.descent;
1932
1933         /* colors */
1934         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1935         xloadcols();
1936
1937         attrs.background_pixel = dc.col[DefaultBG];
1938         attrs.border_pixel = dc.col[DefaultBG];
1939         attrs.bit_gravity = NorthWestGravity;
1940         attrs.event_mask = FocusChangeMask | KeyPressMask
1941                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1942                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask
1943                 | EnterWindowMask | LeaveWindowMask;
1944         attrs.colormap = xw.cmap;
1945
1946         parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
1947         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
1948                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
1949                         XDefaultVisual(xw.dpy, xw.scr),
1950                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1951                         | CWColormap,
1952                         &attrs);
1953         xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win, XdbeCopied);
1954
1955
1956         /* input methods */
1957         xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
1958         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1959                                            | XIMStatusNothing, XNClientWindow, xw.win,
1960                                            XNFocusWindow, xw.win, NULL);
1961         /* gc */
1962         dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
1963
1964         /* white cursor, black outline */
1965         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
1966         XDefineCursor(xw.dpy, xw.win, cursor);
1967         XRecolorCursor(xw.dpy, cursor,
1968                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
1969                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
1970
1971         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
1972
1973         XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
1974         XMapWindow(xw.dpy, xw.win);
1975         xhints();
1976         XSync(xw.dpy, 0);
1977 }
1978
1979 void
1980 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
1981         int fg = base.fg, bg = base.bg, temp;
1982         int winx = BORDER+x*xw.cw, winy = BORDER+y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
1983         XFontSet fontset = dc.font.set;
1984         int i;
1985
1986         /* only switch default fg/bg if term is in RV mode */
1987         if(IS_SET(MODE_REVERSE)) {
1988                 if(fg == DefaultFG)
1989                         fg = DefaultBG;
1990                 if(bg == DefaultBG)
1991                         bg = DefaultFG;
1992         }
1993
1994         if(base.mode & ATTR_REVERSE)
1995                 temp = fg, fg = bg, bg = temp;
1996
1997         if(base.mode & ATTR_BOLD) {
1998                 fg += 8;
1999                 fontset = dc.bfont.set;
2000         }
2001
2002         XSetBackground(xw.dpy, dc.gc, dc.col[bg]);
2003         XSetForeground(xw.dpy, dc.gc, dc.col[fg]);
2004
2005         if(base.mode & ATTR_GFX) {
2006                 for(i = 0; i < bytelen; i++) {
2007                         char c = gfx[(uint)s[i] % 256];
2008                         if(c)
2009                                 s[i] = c;
2010                         else if(s[i] > 0x5f)
2011                                 s[i] -= 0x5f;
2012                 }
2013         }
2014
2015         XmbDrawImageString(xw.dpy, xw.buf, fontset, dc.gc, winx, winy, s, bytelen);
2016
2017         if(base.mode & ATTR_UNDERLINE)
2018                 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
2019 }
2020
2021 /* copy buffer pixmap to screen pixmap */
2022 void
2023 xcopy() {
2024         XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
2025         XdbeSwapBuffers(xw.dpy, swpinfo, 1);
2026
2027 }
2028
2029 void
2030 xdrawcursor(void) {
2031         static int oldx = 0;
2032         static int oldy = 0;
2033         int sl;
2034         Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
2035
2036         LIMIT(oldx, 0, term.col-1);
2037         LIMIT(oldy, 0, term.row-1);
2038
2039         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
2040                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
2041
2042         /* remove the old cursor */
2043         if(term.line[oldy][oldx].state & GLYPH_SET) {
2044                 sl = utf8size(term.line[oldy][oldx].c);
2045                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
2046         } else
2047                 xclear(oldx, oldy, oldx, oldy);
2048
2049         xcopy(oldx, oldy, 1, 1);
2050
2051         /* draw the new one */
2052         if(!(term.c.state & CURSOR_HIDE)) {
2053                 if(!(xw.state & WIN_FOCUSED))
2054                         g.bg = DefaultUCS;
2055
2056                 if(IS_SET(MODE_REVERSE))
2057                         g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
2058
2059                 sl = utf8size(g.c);
2060                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
2061                 oldx = term.c.x, oldy = term.c.y;
2062         }
2063
2064         xcopy(term.c.x, term.c.y, 1, 1);
2065 }
2066
2067 void
2068 redraw(void) {
2069         struct timespec tv = {0, REDRAW_TIMEOUT * 1000};
2070         tfulldirt();
2071         draw();
2072         nanosleep(&tv, NULL);
2073 }
2074
2075 void
2076 draw() {
2077         drawregion(0, 0, term.col, term.row);
2078         xcopy();
2079         gettimeofday(&xw.lastdraw, NULL);
2080 }
2081
2082 void
2083 drawregion(int x1, int y1, int x2, int y2) {
2084         int ic, ib, x, y, ox, sl;
2085         Glyph base, new;
2086         char buf[DRAW_BUF_SIZ];
2087         bool ena_sel = sel.bx != -1, alt = IS_SET(MODE_ALTSCREEN);
2088
2089         if((sel.alt && !alt) || (!sel.alt && alt))
2090                 ena_sel = 0;
2091         if(!(xw.state & WIN_VISIBLE))
2092                 return;
2093
2094         for(y = y1; y < y2; y++) {
2095                 if(!term.dirty[y])
2096                         continue;
2097                 xclear(0, y, term.col, y);
2098                 term.dirty[y] = 0;
2099                 base = term.line[y][0];
2100                 ic = ib = ox = 0;
2101                 for(x = x1; x < x2; x++) {
2102                         new = term.line[y][x];
2103                         if(ena_sel && *(new.c) && selected(x, y))
2104                                 new.mode ^= ATTR_REVERSE;
2105                         if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
2106                                                   ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
2107                                 xdraws(buf, base, ox, y, ic, ib);
2108                                 ic = ib = 0;
2109                         }
2110                         if(new.state & GLYPH_SET) {
2111                                 if(ib == 0) {
2112                                         ox = x;
2113                                         base = new;
2114                                 }
2115                                 sl = utf8size(new.c);
2116                                 memcpy(buf+ib, new.c, sl);
2117                                 ib += sl;
2118                                 ++ic;
2119                         }
2120                 }
2121                 if(ib > 0)
2122                         xdraws(buf, base, ox, y, ic, ib);
2123         }
2124         xdrawcursor();
2125 }
2126
2127 void
2128 expose(XEvent *ev) {
2129         XExposeEvent *e = &ev->xexpose;
2130         if(xw.state & WIN_REDRAW) {
2131                 if(!e->count)
2132                         xw.state &= ~WIN_REDRAW;
2133         }
2134         xcopy();
2135 }
2136
2137 void
2138 visibility(XEvent *ev) {
2139         XVisibilityEvent *e = &ev->xvisibility;
2140         if(e->state == VisibilityFullyObscured)
2141                 xw.state &= ~WIN_VISIBLE;
2142         else if(!(xw.state & WIN_VISIBLE))
2143                 /* need a full redraw for next Expose, not just a buf copy */
2144                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
2145 }
2146
2147 void
2148 unmap(XEvent *ev) {
2149         xw.state &= ~WIN_VISIBLE;
2150 }
2151
2152 void
2153 xseturgency(int add) {
2154         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
2155         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
2156         XSetWMHints(xw.dpy, xw.win, h);
2157         XFree(h);
2158 }
2159
2160 void
2161 focus(XEvent *ev) {
2162         if(ev->type == FocusIn) {
2163                 xw.state |= WIN_FOCUSED;
2164                 xseturgency(0);
2165         } else
2166                 xw.state &= ~WIN_FOCUSED;
2167         draw();
2168 }
2169
2170 char*
2171 kmap(KeySym k, uint state) {
2172         int i;
2173         state &= ~Mod2Mask;
2174         for(i = 0; i < LEN(key); i++) {
2175                 uint mask = key[i].mask;
2176                 if(key[i].k == k && ((state & mask) == mask || (mask == XK_NO_MOD && !state)))
2177                         return (char*)key[i].s;
2178         }
2179         return NULL;
2180 }
2181
2182 void
2183 kpress(XEvent *ev) {
2184         XKeyEvent *e = &ev->xkey;
2185         KeySym ksym;
2186         char buf[32];
2187         char *customkey;
2188         int len;
2189         int meta;
2190         int shift;
2191         Status status;
2192
2193         meta = e->state & Mod1Mask;
2194         shift = e->state & ShiftMask;
2195         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
2196
2197         /* 1. custom keys from config.h */
2198         if((customkey = kmap(ksym, e->state)))
2199                 ttywrite(customkey, strlen(customkey));
2200         /* 2. hardcoded (overrides X lookup) */
2201         else
2202                 switch(ksym) {
2203                 case XK_Up:
2204                 case XK_Down:
2205                 case XK_Left:
2206                 case XK_Right:
2207                         /* XXX: shift up/down doesn't work */
2208                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
2209                         ttywrite(buf, 3);
2210                         break;
2211                 case XK_Insert:
2212                         if(shift)
2213                                 selpaste();
2214                         break;
2215                 case XK_Return:
2216                         if(IS_SET(MODE_CRLF))
2217                                 ttywrite("\r\n", 2);
2218                         else
2219                                 ttywrite("\r", 1);
2220                         break;
2221                         /* 3. X lookup  */
2222                 default:
2223                         if(len > 0) {
2224                                 if(meta && len == 1)
2225                                         ttywrite("\033", 1);
2226                                 ttywrite(buf, len);
2227                         }
2228                         break;
2229                 }
2230 }
2231
2232 void
2233 cmessage(XEvent *e) {
2234         /* See xembed specs
2235            http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
2236         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
2237                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
2238                         xw.state |= WIN_FOCUSED;
2239                         xseturgency(0);
2240                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
2241                         xw.state &= ~WIN_FOCUSED;
2242                 }
2243                 draw();
2244         }
2245 }
2246
2247 void
2248 resize(XEvent *e) {
2249         int col, row;
2250
2251         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
2252                 return;
2253
2254         xw.w = e->xconfigure.width;
2255         xw.h = e->xconfigure.height;
2256         col = (xw.w - 2*BORDER) / xw.cw;
2257         row = (xw.h - 2*BORDER) / xw.ch;
2258         if(col == term.col && row == term.row)
2259                 return;
2260         if(tresize(col, row))
2261                 draw();
2262         xresize(col, row);
2263         ttyresize(col, row);
2264 }
2265
2266 bool
2267 last_draw_too_old(void) {
2268         struct timeval now;
2269         gettimeofday(&now, NULL);
2270         return TIMEDIFF(now, xw.lastdraw) >= DRAW_TIMEOUT/1000;
2271 }
2272
2273 void
2274 run(void) {
2275         XEvent ev;
2276         fd_set rfd;
2277         int xfd = XConnectionNumber(xw.dpy);
2278         struct timeval timeout = {0};
2279         bool stuff_to_print = 0;
2280
2281         for(;;) {
2282                 FD_ZERO(&rfd);
2283                 FD_SET(cmdfd, &rfd);
2284                 FD_SET(xfd, &rfd);
2285                 timeout.tv_sec  = 0;
2286                 timeout.tv_usec = SELECT_TIMEOUT;
2287                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, &timeout) < 0) {
2288                         if(errno == EINTR)
2289                                 continue;
2290                         die("select failed: %s\n", SERRNO);
2291                 }
2292                 if(FD_ISSET(cmdfd, &rfd)) {
2293                         ttyread();
2294                         stuff_to_print = 1;
2295                 }
2296
2297                 if(stuff_to_print && last_draw_too_old()) {
2298                         stuff_to_print = 0;
2299                         draw();
2300                 }
2301
2302                 while(XPending(xw.dpy)) {
2303                         XNextEvent(xw.dpy, &ev);
2304                         if(XFilterEvent(&ev, xw.win))
2305                                 continue;
2306                         if(handler[ev.type])
2307                                 (handler[ev.type])(&ev);
2308                 }
2309         }
2310 }
2311
2312 int
2313 main(int argc, char *argv[]) {
2314         int i, bitm, xr, yr;
2315         unsigned int wr, hr;
2316
2317         xw.fw = xw.fh = xw.fx = xw.fy = 0;
2318         xw.isfixed = False;
2319
2320         for(i = 1; i < argc; i++) {
2321                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
2322                 case 't':
2323                         if(++i < argc) opt_title = argv[i];
2324                         break;
2325                 case 'c':
2326                         if(++i < argc) opt_class = argv[i];
2327                         break;
2328                 case 'w':
2329                         if(++i < argc) opt_embed = argv[i];
2330                         break;
2331                 case 'f':
2332                         if(++i < argc) opt_io = argv[i];
2333                         break;
2334                 case 'e':
2335                         /* eat every remaining arguments */
2336                         if(++i < argc) opt_cmd = &argv[i];
2337                         goto run;
2338                 case 'g':
2339                         if(++i >= argc)
2340                                 break;
2341
2342                         bitm = XParseGeometry(argv[i], &xr, &yr, &wr, &hr);
2343                         if(bitm & XValue)
2344                                 xw.fx = xr;
2345                         if(bitm & YValue)
2346                                 xw.fy = yr;
2347                         if(bitm & WidthValue)
2348                                 xw.fw = (int)wr;
2349                         if(bitm & HeightValue)
2350                                 xw.fh = (int)hr;
2351                         if(bitm & XNegative && xw.fx == 0)
2352                                 xw.fx = -1;
2353                         if(bitm & XNegative && xw.fy == 0)
2354                                 xw.fy = -1;
2355
2356                         if(xw.fh != 0 && xw.fw != 0)
2357                                 xw.isfixed = True;
2358                         break;
2359                 case 'v':
2360                 default:
2361                         die(USAGE);
2362                 }
2363         }
2364
2365  run:
2366         setlocale(LC_CTYPE, "");
2367         tnew(80, 24);
2368         ttynew();
2369         xinit();
2370         selinit();
2371         run();
2372         return 0;
2373 }
2374