1 /* $OpenBSD: cl_main.c,v 1.19 2008/03/28 17:58:20 jasper Exp $ */ 2 3 /*- 4 * Copyright (c) 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * Copyright (c) 1993, 1994, 1995, 1996 7 * Keith Bostic. All rights reserved. 8 * 9 * See the LICENSE file for redistribution information. 10 */ 11 12 #include "config.h" 13 14 #ifndef lint 15 static const char sccsid[] = "@(#)cl_main.c 10.36 (Berkeley) 10/14/96"; 16 #endif /* not lint */ 17 18 #include <sys/types.h> 19 #include <sys/queue.h> 20 21 #include <bitstring.h> 22 #include <curses.h> 23 #include <errno.h> 24 #include <fcntl.h> 25 #include <signal.h> 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <term.h> 30 #include <termios.h> 31 #include <unistd.h> 32 33 #include "../common/common.h" 34 #ifdef RUNNING_IP 35 #include "../ip/ip.h" 36 #endif 37 #include "cl.h" 38 #include "pathnames.h" 39 40 GS *__global_list; /* GLOBAL: List of screens. */ 41 sigset_t __sigblockset; /* GLOBAL: Blocked signals. */ 42 43 static void cl_func_std(GS *); 44 static CL_PRIVATE *cl_init(GS *); 45 static GS *gs_init(char *); 46 static void perr(char *, char *); 47 static int setsig(int, struct sigaction *, void (*)(int)); 48 static void sig_end(GS *); 49 static void term_init(char *, char *); 50 51 /* 52 * main -- 53 * This is the main loop for the standalone curses editor. 54 */ 55 int 56 main(int argc, char *argv[]) 57 { 58 static int reenter; 59 CL_PRIVATE *clp; 60 GS *gp; 61 size_t rows, cols; 62 int rval; 63 char *ttype; 64 #ifdef RUNNING_IP 65 char *ip_arg; 66 char **p_av, **t_av; 67 #endif 68 69 /* If loaded at 0 and jumping through a NULL pointer, stop. */ 70 if (reenter++) 71 abort(); 72 73 /* Create and initialize the global structure. */ 74 __global_list = gp = gs_init(argv[0]); 75 76 /* 77 * Strip out any arguments that vi isn't going to understand. There's 78 * no way to portably call getopt twice, so arguments parsed here must 79 * be removed from the argument list. 80 */ 81 #ifdef RUNNING_IP 82 ip_arg = NULL; 83 for (p_av = t_av = argv;;) { 84 if (*t_av == NULL) { 85 *p_av = NULL; 86 break; 87 } 88 if (!strcmp(*t_av, "--")) { 89 while ((*p_av++ = *t_av++) != NULL); 90 break; 91 } 92 if (!memcmp(*t_av, "-I", sizeof("-I") - 1)) { 93 if (t_av[0][2] != '\0') { 94 ip_arg = t_av[0] + 2; 95 ++t_av; 96 --argc; 97 continue; 98 } 99 if (t_av[1] != NULL) { 100 ip_arg = t_av[1]; 101 t_av += 2; 102 argc -= 2; 103 continue; 104 } 105 } 106 *p_av++ = *t_av++; 107 } 108 109 /* 110 * If we're being called as an editor library, we're done here, we 111 * get loaded with the curses screen, we don't share much code. 112 */ 113 if (ip_arg != NULL) 114 exit (ip_main(argc, argv, gp, ip_arg)); 115 #endif 116 117 /* Create and initialize the CL_PRIVATE structure. */ 118 clp = cl_init(gp); 119 120 /* 121 * Initialize the terminal information. 122 * 123 * We have to know what terminal it is from the start, since we may 124 * have to use termcap/terminfo to find out how big the screen is. 125 */ 126 if ((ttype = getenv("TERM")) == NULL) 127 ttype = "unknown"; 128 term_init(gp->progname, ttype); 129 130 /* Add the terminal type to the global structure. */ 131 if ((OG_D_STR(gp, GO_TERM) = 132 OG_STR(gp, GO_TERM) = strdup(ttype)) == NULL) 133 perr(gp->progname, NULL); 134 135 /* Figure out how big the screen is. */ 136 if (cl_ssize(NULL, 0, &rows, &cols, NULL)) 137 exit (1); 138 139 /* Add the rows and columns to the global structure. */ 140 OG_VAL(gp, GO_LINES) = OG_D_VAL(gp, GO_LINES) = rows; 141 OG_VAL(gp, GO_COLUMNS) = OG_D_VAL(gp, GO_COLUMNS) = cols; 142 143 /* Ex wants stdout to be buffered. */ 144 (void)setvbuf(stdout, NULL, _IOFBF, 0); 145 146 /* Start catching signals. */ 147 if (sig_init(gp, NULL)) 148 exit (1); 149 150 /* Run ex/vi. */ 151 rval = editor(gp, argc, argv); 152 153 /* Clean up signals. */ 154 sig_end(gp); 155 156 /* Clean up the terminal. */ 157 (void)cl_quit(gp); 158 159 /* 160 * XXX 161 * Reset the O_MESG option. 162 */ 163 if (clp->tgw != TGW_UNKNOWN) 164 (void)cl_omesg(NULL, clp, clp->tgw == TGW_SET); 165 166 /* 167 * XXX 168 * Reset the X11 xterm icon/window name. 169 */ 170 if (F_ISSET(clp, CL_RENAME)) { 171 (void)printf(XTERM_RENAME, ttype); 172 (void)fflush(stdout); 173 } 174 175 /* If a killer signal arrived, pretend we just got it. */ 176 if (clp->killersig) { 177 (void)signal(clp->killersig, SIG_DFL); 178 (void)kill(getpid(), clp->killersig); 179 /* NOTREACHED */ 180 } 181 182 /* Free the global and CL private areas. */ 183 #if defined(DEBUG) || defined(PURIFY) || defined(LIBRARY) 184 free(clp); 185 free(gp); 186 #endif 187 188 exit (rval); 189 } 190 191 /* 192 * gs_init -- 193 * Create and partially initialize the GS structure. 194 */ 195 static GS * 196 gs_init(name) 197 char *name; 198 { 199 GS *gp; 200 char *p; 201 202 /* Figure out what our name is. */ 203 if ((p = strrchr(name, '/')) != NULL) 204 name = p + 1; 205 206 /* Allocate the global structure. */ 207 CALLOC_NOMSG(NULL, gp, GS *, 1, sizeof(GS)); 208 if (gp == NULL) 209 perr(name, NULL); 210 211 212 gp->progname = name; 213 return (gp); 214 } 215 216 /* 217 * cl_init -- 218 * Create and partially initialize the CL structure. 219 */ 220 static CL_PRIVATE * 221 cl_init(gp) 222 GS *gp; 223 { 224 CL_PRIVATE *clp; 225 int fd; 226 227 /* Allocate the CL private structure. */ 228 CALLOC_NOMSG(NULL, clp, CL_PRIVATE *, 1, sizeof(CL_PRIVATE)); 229 if (clp == NULL) 230 perr(gp->progname, NULL); 231 gp->cl_private = clp; 232 233 /* 234 * Set the CL_STDIN_TTY flag. It's purpose is to avoid setting 235 * and resetting the tty if the input isn't from there. We also 236 * use the same test to determine if we're running a script or 237 * not. 238 */ 239 if (isatty(STDIN_FILENO)) 240 F_SET(clp, CL_STDIN_TTY); 241 else 242 F_SET(gp, G_SCRIPTED); 243 244 /* 245 * We expect that if we've lost our controlling terminal that the 246 * open() (but not the tcgetattr()) will fail. 247 */ 248 if (F_ISSET(clp, CL_STDIN_TTY)) { 249 if (tcgetattr(STDIN_FILENO, &clp->orig) == -1) 250 goto tcfail; 251 } else if ((fd = open(_PATH_TTY, O_RDONLY, 0)) != -1) { 252 if (tcgetattr(fd, &clp->orig) == -1) { 253 tcfail: perr(gp->progname, "tcgetattr"); 254 exit (1); 255 } 256 (void)close(fd); 257 } 258 259 /* Initialize the list of curses functions. */ 260 cl_func_std(gp); 261 262 return (clp); 263 } 264 265 /* 266 * term_init -- 267 * Initialize terminal information. 268 */ 269 static void 270 term_init(name, ttype) 271 char *name, *ttype; 272 { 273 int err; 274 275 /* Set up the terminal database information. */ 276 setupterm(ttype, STDOUT_FILENO, &err); 277 switch (err) { 278 case -1: 279 (void)fprintf(stderr, 280 "%s: No terminal database found\n", name); 281 exit (1); 282 case 0: 283 (void)fprintf(stderr, 284 "%s: %s: unknown terminal type\n", name, ttype); 285 exit (1); 286 } 287 } 288 289 #define GLOBAL_CLP \ 290 CL_PRIVATE *clp = GCLP(__global_list); 291 static void 292 h_hup(signo) 293 int signo; 294 { 295 GLOBAL_CLP; 296 297 F_SET(clp, CL_SIGHUP); 298 clp->killersig = SIGHUP; 299 } 300 301 static void 302 h_int(signo) 303 int signo; 304 { 305 GLOBAL_CLP; 306 307 F_SET(clp, CL_SIGINT); 308 } 309 310 static void 311 h_term(signo) 312 int signo; 313 { 314 GLOBAL_CLP; 315 316 F_SET(clp, CL_SIGTERM); 317 clp->killersig = SIGTERM; 318 } 319 320 static void 321 h_winch(signo) 322 int signo; 323 { 324 GLOBAL_CLP; 325 326 F_SET(clp, CL_SIGWINCH); 327 } 328 #undef GLOBAL_CLP 329 330 /* 331 * sig_init -- 332 * Initialize signals. 333 * 334 * PUBLIC: int sig_init(GS *, SCR *); 335 */ 336 int 337 sig_init(gp, sp) 338 GS *gp; 339 SCR *sp; 340 { 341 CL_PRIVATE *clp; 342 343 clp = GCLP(gp); 344 345 if (sp == NULL) { 346 (void)sigemptyset(&__sigblockset); 347 if (sigaddset(&__sigblockset, SIGHUP) || 348 setsig(SIGHUP, &clp->oact[INDX_HUP], h_hup) || 349 sigaddset(&__sigblockset, SIGINT) || 350 setsig(SIGINT, &clp->oact[INDX_INT], h_int) || 351 sigaddset(&__sigblockset, SIGTERM) || 352 setsig(SIGTERM, &clp->oact[INDX_TERM], h_term) 353 #ifdef SIGWINCH 354 || 355 sigaddset(&__sigblockset, SIGWINCH) || 356 setsig(SIGWINCH, &clp->oact[INDX_WINCH], h_winch) 357 #endif 358 ) { 359 perr(gp->progname, NULL); 360 return (1); 361 } 362 } else 363 if (setsig(SIGHUP, NULL, h_hup) || 364 setsig(SIGINT, NULL, h_int) || 365 setsig(SIGTERM, NULL, h_term) 366 #ifdef SIGWINCH 367 || 368 setsig(SIGWINCH, NULL, h_winch) 369 #endif 370 ) { 371 msgq(sp, M_SYSERR, "signal-reset"); 372 } 373 return (0); 374 } 375 376 /* 377 * setsig -- 378 * Set a signal handler. 379 */ 380 static int 381 setsig(signo, oactp, handler) 382 int signo; 383 struct sigaction *oactp; 384 void (*handler)(int); 385 { 386 struct sigaction act; 387 388 /* 389 * Use sigaction(2), not signal(3), since we don't always want to 390 * restart system calls. The example is when waiting for a command 391 * mode keystroke and SIGWINCH arrives. Besides, you can't portably 392 * restart system calls (thanks, POSIX!). On the other hand, you 393 * can't portably NOT restart system calls (thanks, Sun!). SunOS 394 * used SA_INTERRUPT as their extension to NOT restart read calls. 395 * We sure hope nobody else used it for anything else. Mom told me 396 * there'd be days like this. She just never told me that there'd 397 * be so many. 398 */ 399 act.sa_handler = handler; 400 sigemptyset(&act.sa_mask); 401 402 #ifdef SA_INTERRUPT 403 act.sa_flags = SA_INTERRUPT; 404 #else 405 act.sa_flags = 0; 406 #endif 407 return (sigaction(signo, &act, oactp)); 408 } 409 410 /* 411 * sig_end -- 412 * End signal setup. 413 */ 414 static void 415 sig_end(gp) 416 GS *gp; 417 { 418 CL_PRIVATE *clp; 419 420 clp = GCLP(gp); 421 (void)sigaction(SIGHUP, NULL, &clp->oact[INDX_HUP]); 422 (void)sigaction(SIGINT, NULL, &clp->oact[INDX_INT]); 423 (void)sigaction(SIGTERM, NULL, &clp->oact[INDX_TERM]); 424 #ifdef SIGWINCH 425 (void)sigaction(SIGWINCH, NULL, &clp->oact[INDX_WINCH]); 426 #endif 427 } 428 429 /* 430 * cl_func_std -- 431 * Initialize the standard curses functions. 432 */ 433 static void 434 cl_func_std(gp) 435 GS *gp; 436 { 437 gp->scr_addstr = cl_addstr; 438 gp->scr_attr = cl_attr; 439 gp->scr_baud = cl_baud; 440 gp->scr_bell = cl_bell; 441 gp->scr_busy = NULL; 442 gp->scr_clrtoeol = cl_clrtoeol; 443 gp->scr_cursor = cl_cursor; 444 gp->scr_deleteln = cl_deleteln; 445 gp->scr_event = cl_event; 446 gp->scr_ex_adjust = cl_ex_adjust; 447 gp->scr_fmap = cl_fmap; 448 gp->scr_insertln = cl_insertln; 449 gp->scr_keyval = cl_keyval; 450 gp->scr_move = cl_move; 451 gp->scr_msg = NULL; 452 gp->scr_optchange = cl_optchange; 453 gp->scr_refresh = cl_refresh; 454 gp->scr_rename = cl_rename; 455 gp->scr_screen = cl_screen; 456 gp->scr_suspend = cl_suspend; 457 gp->scr_usage = cl_usage; 458 } 459 460 /* 461 * perr -- 462 * Print system error. 463 */ 464 static void 465 perr(name, msg) 466 char *name, *msg; 467 { 468 (void)fprintf(stderr, "%s:", name); 469 if (msg != NULL) 470 (void)fprintf(stderr, "%s:", msg); 471 (void)fprintf(stderr, "%s\n", strerror(errno)); 472 exit(1); 473 } 474