resize.c revision 8f44fb3b
1/* $XTermId: resize.c,v 1.145 2021/03/21 20:03:17 tom Exp $ */ 2 3/* 4 * Copyright 2003-2020,2021 by Thomas E. Dickey 5 * 6 * All Rights Reserved 7 * 8 * Permission is hereby granted, free of charge, to any person obtaining a 9 * copy of this software and associated documentation files (the 10 * "Software"), to deal in the Software without restriction, including 11 * without limitation the rights to use, copy, modify, merge, publish, 12 * distribute, sublicense, and/or sell copies of the Software, and to 13 * permit persons to whom the Software is furnished to do so, subject to 14 * the following conditions: 15 * 16 * The above copyright notice and this permission notice shall be included 17 * in all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 22 * IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY 23 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 26 * 27 * Except as contained in this notice, the name(s) of the above copyright 28 * holders shall not be used in advertising or otherwise to promote the 29 * sale, use or other dealings in this Software without prior written 30 * authorization. 31 * 32 * 33 * Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts. 34 * 35 * All Rights Reserved 36 * 37 * Permission to use, copy, modify, and distribute this software and its 38 * documentation for any purpose and without fee is hereby granted, 39 * provided that the above copyright notice appear in all copies and that 40 * both that copyright notice and this permission notice appear in 41 * supporting documentation, and that the name of Digital Equipment 42 * Corporation not be used in advertising or publicity pertaining to 43 * distribution of the software without specific, written prior permission. 44 * 45 * 46 * DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING 47 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL 48 * DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR 49 * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, 50 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 51 * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 52 * SOFTWARE. 53 */ 54 55/* resize.c */ 56 57#include <stdio.h> 58#include <ctype.h> 59 60#ifdef RESIZE_ONLY 61#include "resize.h" 62#else 63#include <xterm.h> 64#include <version.h> 65#include <xstrings.h> 66#include <xtermcap.h> 67#include <xterm_io.h> 68#endif 69 70#ifndef USE_TERMINFO /* avoid conflict with configure script */ 71#if defined(__QNX__) || defined(__SCO__) || defined(linux) || defined(__OpenBSD__) || defined(__UNIXWARE__) 72#define USE_TERMINFO 73#endif 74#endif 75 76#if defined(__QNX__) 77#include <unix.h> 78#endif 79 80/* 81 * Some OS's may want to use both, like SCO for example. We catch here anyone 82 * who hasn't decided what they want. 83 */ 84#if !defined(USE_TERMCAP) && !defined(USE_TERMINFO) 85#define USE_TERMINFO 86#endif 87 88#include <signal.h> 89#include <pwd.h> 90 91#ifdef USE_IGNORE_RC 92int ignore_unused; 93#endif 94 95#ifdef __MVS__ 96#define ESCAPE(string) "\047" string 97#else 98#define ESCAPE(string) "\033" string 99#endif 100 101#define EMULATIONS 2 102#define SUN 1 103#define VT100 0 104 105#define TIMEOUT 10 106 107#define SHELL_UNKNOWN 0 108#define SHELL_C 1 109#define SHELL_BOURNE 2 110/* *INDENT-OFF* */ 111static struct { 112 const char *name; 113 int type; 114} shell_list[] = { 115 { "csh", SHELL_C }, /* vanilla cshell */ 116 { "jcsh", SHELL_C }, 117 { "tcsh", SHELL_C }, 118 { "sh", SHELL_BOURNE }, /* vanilla Bourne shell */ 119 { "ash", SHELL_BOURNE }, 120 { "bash", SHELL_BOURNE }, /* GNU Bourne again shell */ 121 { "dash", SHELL_BOURNE }, 122 { "jsh", SHELL_BOURNE }, 123 { "ksh", SHELL_BOURNE }, /* Korn shell (from AT&T toolchest) */ 124 { "ksh-i", SHELL_BOURNE }, /* another name for Korn shell */ 125 { "ksh93", SHELL_BOURNE }, /* Korn shell */ 126 { "mksh", SHELL_BOURNE }, 127 { "pdksh", SHELL_BOURNE }, 128 { "zsh", SHELL_BOURNE }, 129 { NULL, SHELL_BOURNE } /* default (same as xterm's) */ 130}; 131/* *INDENT-ON* */ 132 133static const char *const emuname[EMULATIONS] = 134{ 135 "VT100", 136 "Sun", 137}; 138static char *myname; 139static int shell_type = SHELL_UNKNOWN; 140static const char *const getsize[EMULATIONS] = 141{ 142 ESCAPE("7") ESCAPE("[r") ESCAPE("[9999;9999H") ESCAPE("[6n"), 143 ESCAPE("[18t"), 144}; 145#if defined(USE_STRUCT_WINSIZE) 146static const char *const getwsize[EMULATIONS] = 147{ /* size in pixels */ 148 0, 149 ESCAPE("[14t"), 150}; 151#endif /* USE_STRUCT_WINSIZE */ 152static const char *const restore[EMULATIONS] = 153{ 154 ESCAPE("8"), 155 0, 156}; 157static const char *const setsize[EMULATIONS] = 158{ 159 0, 160 ESCAPE("[8;%s;%st"), 161}; 162 163#ifdef USE_ANY_SYSV_TERMIO 164static struct termio tioorig; 165#elif defined(USE_TERMIOS) 166static struct termios tioorig; 167#else 168static struct sgttyb sgorig; 169#endif /* USE_ANY_SYSV_TERMIO/USE_TERMIOS */ 170 171static const char *const size[EMULATIONS] = 172{ 173 ESCAPE("[%d;%dR"), 174 ESCAPE("[8;%d;%dt"), 175}; 176static const char sunname[] = "sunsize"; 177static int tty; 178static FILE *ttyfp; 179 180#if defined(USE_STRUCT_WINSIZE) 181static const char *wsize[EMULATIONS] = 182{ 183 0, 184 ESCAPE("[4;%hd;%hdt"), 185}; 186#endif /* USE_STRUCT_WINSIZE */ 187 188static GCC_NORETURN void failed(const char *); 189static GCC_NORETURN void onintr(int); 190static GCC_NORETURN void resize_timeout(int); 191static GCC_NORETURN void Usage(void); 192 193static void 194failed(const char *s) 195{ 196 int save = errno; 197 IGNORE_RC(write(2, myname, strlen(myname))); 198 IGNORE_RC(write(2, ": ", (size_t) 2)); 199 errno = save; 200 perror(s); 201 exit(EXIT_FAILURE); 202} 203 204/* ARGSUSED */ 205static void 206onintr(int sig GCC_UNUSED) 207{ 208#ifdef USE_ANY_SYSV_TERMIO 209 (void) ioctl(tty, TCSETAW, &tioorig); 210#elif defined(USE_TERMIOS) 211 (void) tcsetattr(tty, TCSADRAIN, &tioorig); 212#else /* not USE_TERMIOS */ 213 (void) ioctl(tty, TIOCSETP, &sgorig); 214#endif /* USE_ANY_SYSV_TERMIO/USE_TERMIOS */ 215 exit(EXIT_FAILURE); 216} 217 218static void 219resize_timeout(int sig) 220{ 221 fprintf(stderr, "\n%s: Time out occurred\r\n", myname); 222 onintr(sig); 223} 224 225static void 226Usage(void) 227{ 228 fprintf(stderr, strcmp(myname, sunname) == 0 ? 229 "Usage: %s [rows cols]\n" : 230 "Usage: %s [-v] [-u] [-c] [-s [rows cols]]\n", myname); 231 exit(EXIT_FAILURE); 232} 233 234#ifdef USE_TERMCAP 235static void 236print_termcap(const char *termcap) 237{ 238 int ch; 239 240 putchar('\''); 241 while ((ch = *termcap++) != '\0') { 242 switch (ch & 0xff) { 243 case 127: /* undo bug in GNU termcap */ 244 printf("^?"); 245 break; 246 case '\'': /* must escape anyway (unlikely) */ 247 /* FALLTHRU */ 248 case '!': /* must escape for SunOS csh */ 249 putchar('\\'); 250 /* FALLTHRU */ 251 default: 252 putchar(ch); 253 break; 254 } 255 } 256 putchar('\''); 257} 258#endif /* USE_TERMCAP */ 259 260static int 261checkdigits(char *str) 262{ 263 while (*str) { 264 if (!isdigit(CharOf(*str))) 265 return (0); 266 str++; 267 } 268 return (1); 269} 270 271static void 272readstring(FILE *fp, char *buf, const char *str) 273{ 274 int last, c; 275#if !defined(USG) && !defined(__minix) 276 /* What is the advantage of setitimer() over alarm()? */ 277 struct itimerval it; 278#endif 279 280 signal(SIGALRM, resize_timeout); 281#if defined(USG) || defined(__minix) 282 alarm(TIMEOUT); 283#else 284 memset((char *) &it, 0, sizeof(struct itimerval)); 285 it.it_value.tv_sec = TIMEOUT; 286 setitimer(ITIMER_REAL, &it, (struct itimerval *) NULL); 287#endif 288 if ((c = getc(fp)) == 0233) { /* meta-escape, CSI */ 289 c = ESCAPE("")[0]; 290 *buf++ = (char) c; 291 *buf++ = '['; 292 } else { 293 *buf++ = (char) c; 294 } 295 if (c != *str) { 296 fprintf(stderr, "%s: unknown character, exiting.\r\n", myname); 297 onintr(0); 298 } 299 last = str[strlen(str) - 1]; 300 while ((*buf++ = (char) getc(fp)) != last) { 301 ; 302 } 303#if defined(USG) || defined(__minix) 304 alarm(0); 305#else 306 memset((char *) &it, 0, sizeof(struct itimerval)); 307 setitimer(ITIMER_REAL, &it, (struct itimerval *) NULL); 308#endif 309 *buf = 0; 310} 311 312/* 313 resets termcap string to reflect current screen size 314 */ 315int 316main(int argc, char **argv ENVP_ARG) 317{ 318#ifdef USE_TERMCAP 319 char *env; 320#endif 321 char *ptr; 322 int emu = VT100; 323 char *shell; 324 int i; 325 int rc; 326 int rows, cols; 327#ifdef USE_ANY_SYSV_TERMIO 328 struct termio tio; 329#elif defined(USE_TERMIOS) 330 struct termios tio; 331#else 332 struct sgttyb sg; 333#endif /* USE_ANY_SYSV_TERMIO/USE_TERMIOS */ 334#ifdef USE_TERMCAP 335 int ok_tcap = 1; 336 char termcap[TERMCAP_SIZE]; 337 char newtc[TERMCAP_SIZE]; 338#endif /* USE_TERMCAP */ 339 char buf[BUFSIZ]; 340#ifdef TTYSIZE_STRUCT 341 TTYSIZE_STRUCT ts; 342#endif 343 char *name_of_tty; 344#ifdef CANT_OPEN_DEV_TTY 345 extern char *ttyname(); 346#endif 347 const char *setname = ""; 348 349 myname = x_basename(argv[0]); 350 if (strcmp(myname, sunname) == 0) 351 emu = SUN; 352 for (argv++, argc--; argc > 0 && **argv == '-'; argv++, argc--) { 353 switch ((*argv)[1]) { 354 case 's': /* Sun emulation */ 355 if (emu == SUN) 356 Usage(); /* Never returns */ 357 emu = SUN; 358 break; 359 case 'u': /* Bourne (Unix) shell */ 360 shell_type = SHELL_BOURNE; 361 break; 362 case 'c': /* C shell */ 363 shell_type = SHELL_C; 364 break; 365 case 'v': 366 printf("%s\n", xtermVersion()); 367 exit(EXIT_SUCCESS); 368 default: 369 Usage(); /* Never returns */ 370 } 371 } 372 373 if (SHELL_UNKNOWN == shell_type) { 374 /* Find out what kind of shell this user is running. 375 * This is the same algorithm that xterm uses. 376 */ 377 if ((ptr = x_getenv("SHELL")) == NULL) { 378 uid_t uid = getuid(); 379 struct passwd pw; 380 381 if (x_getpwuid(uid, &pw)) { 382 (void) x_getlogin(uid, &pw); 383 } 384 if (!OkPasswd(&pw) 385 || *(ptr = pw.pw_shell) == 0) { 386 /* this is the same default that xterm uses */ 387 ptr = x_strdup("/bin/sh"); 388 } 389 } 390 391 shell = x_basename(ptr); 392 393 /* now that we know, what kind is it? */ 394 for (i = 0; shell_list[i].name; i++) { 395 if (!strcmp(shell_list[i].name, shell)) { 396 break; 397 } 398 } 399 shell_type = shell_list[i].type; 400 } 401 402 if (argc == 2) { 403 if (!setsize[emu]) { 404 fprintf(stderr, 405 "%s: Can't set window size under %s emulation\n", 406 myname, emuname[emu]); 407 exit(EXIT_FAILURE); 408 } 409 if (!checkdigits(argv[0]) || !checkdigits(argv[1])) { 410 Usage(); /* Never returns */ 411 } 412 } else if (argc != 0) { 413 Usage(); /* Never returns */ 414 } 415#ifdef CANT_OPEN_DEV_TTY 416 if ((name_of_tty = ttyname(fileno(stderr))) == NULL) 417#endif 418 name_of_tty = x_strdup("/dev/tty"); 419 420 if ((ttyfp = fopen(name_of_tty, "r+")) == NULL) { 421 fprintf(stderr, "%s: can't open terminal %s\n", 422 myname, name_of_tty); 423 exit(EXIT_FAILURE); 424 } 425 tty = fileno(ttyfp); 426#ifdef USE_TERMCAP 427 if ((env = x_getenv("TERM")) == 0) { 428 env = x_strdup(DFT_TERMTYPE); 429 if (SHELL_BOURNE == shell_type) { 430 setname = "TERM=" DFT_TERMTYPE ";\nexport TERM;\n"; 431 } else { 432 setname = "setenv TERM " DFT_TERMTYPE ";\n"; 433 } 434 } 435 termcap[0] = 0; /* ...just in case we've accidentally gotten terminfo */ 436 if (tgetent(termcap, env) <= 0 || termcap[0] == 0) { 437 ok_tcap = 0; 438 } 439#endif /* USE_TERMCAP */ 440#ifdef USE_TERMINFO 441 if (x_getenv("TERM") == 0) { 442 if (SHELL_BOURNE == shell_type) { 443 setname = "TERM=" DFT_TERMTYPE ";\nexport TERM;\n"; 444 } else { 445 setname = "setenv TERM " DFT_TERMTYPE ";\n"; 446 } 447 } 448#endif /* USE_TERMINFO */ 449 450#ifdef USE_ANY_SYSV_TERMIO 451 rc = ioctl(tty, TCGETA, &tioorig); 452 tio = tioorig; 453 UIntClr(tio.c_iflag, (ICRNL | IUCLC)); 454 UIntClr(tio.c_lflag, (ICANON | ECHO)); 455 tio.c_cflag |= CS8; 456 tio.c_cc[VMIN] = 6; 457 tio.c_cc[VTIME] = 1; 458#elif defined(USE_TERMIOS) 459 rc = tcgetattr(tty, &tioorig); 460 tio = tioorig; 461 UIntClr(tio.c_iflag, ICRNL); 462 UIntClr(tio.c_lflag, (ICANON | ECHO)); 463 tio.c_cflag |= CS8; 464 tio.c_cc[VMIN] = 6; 465 tio.c_cc[VTIME] = 1; 466#else /* not USE_TERMIOS */ 467 rc = ioctl(tty, TIOCGETP, &sgorig); 468 sg = sgorig; 469 sg.sg_flags |= RAW; 470 UIntClr(sg.sg_flags, ECHO); 471#endif /* USE_ANY_SYSV_TERMIO/USE_TERMIOS */ 472 if (rc != 0) 473 failed("get tty settings"); 474 475 signal(SIGINT, onintr); 476 signal(SIGQUIT, onintr); 477 signal(SIGTERM, onintr); 478 479#ifdef USE_ANY_SYSV_TERMIO 480 rc = ioctl(tty, TCSETAW, &tio); 481#elif defined(USE_TERMIOS) 482 rc = tcsetattr(tty, TCSADRAIN, &tio); 483#else /* not USE_TERMIOS */ 484 rc = ioctl(tty, TIOCSETP, &sg); 485#endif /* USE_ANY_SYSV_TERMIO/USE_TERMIOS */ 486 if (rc != 0) 487 failed("set tty settings"); 488 489 if (argc == 2) { /* look for optional parameters of "-s" */ 490 char *tmpbuf = TypeMallocN(char, 491 strlen(setsize[emu]) + 492 strlen(argv[0]) + 493 strlen(argv[1]) + 494 1); 495 if (tmpbuf == 0) { 496 fprintf(stderr, "%s: Cannot query size\n", myname); 497 onintr(0); 498 } else { 499 sprintf(tmpbuf, setsize[emu], argv[0], argv[1]); 500 IGNORE_RC(write(tty, tmpbuf, strlen(tmpbuf))); 501 free(tmpbuf); 502 } 503 } 504 IGNORE_RC(write(tty, getsize[emu], strlen(getsize[emu]))); 505 readstring(ttyfp, buf, size[emu]); 506 if (sscanf(buf, size[emu], &rows, &cols) != 2) { 507 fprintf(stderr, "%s: Can't get rows and columns\r\n", myname); 508 onintr(0); 509 } 510 if (restore[emu]) 511 IGNORE_RC(write(tty, restore[emu], strlen(restore[emu]))); 512#if defined(USE_STRUCT_WINSIZE) 513 /* finally, set the tty's window size */ 514 if (getwsize[emu]) { 515 /* get the window size in pixels */ 516 IGNORE_RC(write(tty, getwsize[emu], strlen(getwsize[emu]))); 517 readstring(ttyfp, buf, wsize[emu]); 518 if (sscanf(buf, wsize[emu], &ts.ws_xpixel, &ts.ws_ypixel) != 2) { 519 fprintf(stderr, "%s: Can't get window size\r\n", myname); 520 onintr(0); 521 } 522 setup_winsize(ts, rows, cols, 0, 0); 523 SET_TTYSIZE(tty, ts); 524 } else if (ioctl(tty, TIOCGWINSZ, &ts) != -1) { 525 /* we don't have any way of directly finding out 526 the current height & width of the window in pixels. We try 527 our best by computing the font height and width from the "old" 528 window-size values, and multiplying by these ratios... */ 529#define scaled(old,new,len) (old)?((unsigned)(new)*(len)/(old)):(len) 530 setup_winsize(ts, rows, cols, 531 scaled(TTYSIZE_ROWS(ts), rows, ts.ws_ypixel), 532 scaled(TTYSIZE_COLS(ts), cols, ts.ws_xpixel)); 533 SET_TTYSIZE(tty, ts); 534 } 535#endif /* USE_STRUCT_WINSIZE */ 536 537#ifdef USE_ANY_SYSV_TERMIO 538 rc = ioctl(tty, TCSETAW, &tioorig); 539#elif defined(USE_TERMIOS) 540 rc = tcsetattr(tty, TCSADRAIN, &tioorig); 541#else /* not USE_TERMIOS */ 542 rc = ioctl(tty, TIOCSETP, &sgorig); 543#endif /* USE_ANY_SYSV_TERMIO/USE_TERMIOS */ 544 if (rc != 0) 545 failed("set tty settings"); 546 547 signal(SIGINT, SIG_DFL); 548 signal(SIGQUIT, SIG_DFL); 549 signal(SIGTERM, SIG_DFL); 550 551#ifdef USE_TERMCAP 552 if (ok_tcap) { 553 /* update termcap string */ 554 /* first do columns */ 555 if ((ptr = x_strindex(termcap, "co#")) == NULL) { 556 fprintf(stderr, "%s: No `co#'\n", myname); 557 exit(EXIT_FAILURE); 558 } 559 560 i = (int) (ptr - termcap) + 3; 561 strncpy(newtc, termcap, (size_t) i); 562 sprintf(newtc + i, "%d", cols); 563 if ((ptr = strchr(ptr, ':')) != 0) 564 strcat(newtc, ptr); 565 566 /* now do lines */ 567 if ((ptr = x_strindex(newtc, "li#")) == NULL) { 568 fprintf(stderr, "%s: No `li#'\n", myname); 569 exit(EXIT_FAILURE); 570 } 571 572 i = (int) (ptr - newtc) + 3; 573 strncpy(termcap, newtc, (size_t) i); 574 sprintf(termcap + i, "%d", rows); 575 if ((ptr = strchr(ptr, ':')) != 0) 576 strcat(termcap, ptr); 577 } 578#endif /* USE_TERMCAP */ 579 580 if (SHELL_BOURNE == shell_type) { 581 582#ifdef USE_TERMCAP 583 if (ok_tcap) { 584 printf("%sTERMCAP=", setname); 585 print_termcap(termcap); 586 printf(";\nexport TERMCAP;\n"); 587 } 588#endif /* USE_TERMCAP */ 589#ifdef USE_TERMINFO 590 printf("%sCOLUMNS=%d;\nLINES=%d;\nexport COLUMNS LINES;\n", 591 setname, cols, rows); 592#endif /* USE_TERMINFO */ 593 594 } else { /* not Bourne shell */ 595 596#ifdef USE_TERMCAP 597 if (ok_tcap) { 598 printf("set noglob;\n%ssetenv TERMCAP ", setname); 599 print_termcap(termcap); 600 printf(";\nunset noglob;\n"); 601 } 602#endif /* USE_TERMCAP */ 603#ifdef USE_TERMINFO 604 printf("set noglob;\n%ssetenv COLUMNS '%d';\nsetenv LINES '%d';\nunset noglob;\n", 605 setname, cols, rows); 606#endif /* USE_TERMINFO */ 607 } 608 exit(EXIT_SUCCESS); 609} 610