1 /* $NetBSD: options.c,v 1.41 2009/01/18 00:30:54 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)options.c 8.2 (Berkeley) 5/4/95"; 39 #else 40 __RCSID("$NetBSD: options.c,v 1.41 2009/01/18 00:30:54 lukem Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 #include <signal.h> 45 #include <unistd.h> 46 #include <stdlib.h> 47 48 #include "shell.h" 49 #define DEFINE_OPTIONS 50 #include "options.h" 51 #undef DEFINE_OPTIONS 52 #include "nodes.h" /* for other header files */ 53 #include "eval.h" 54 #include "jobs.h" 55 #include "input.h" 56 #include "output.h" 57 #include "trap.h" 58 #include "var.h" 59 #include "memalloc.h" 60 #include "error.h" 61 #include "mystring.h" 62 #ifndef SMALL 63 #include "myhistedit.h" 64 #endif 65 #include "show.h" 66 67 char *arg0; /* value of $0 */ 68 struct shparam shellparam; /* current positional parameters */ 69 char **argptr; /* argument list for builtin commands */ 70 char *optionarg; /* set by nextopt (like getopt) */ 71 char *optptr; /* used by nextopt */ 72 73 char *minusc; /* argument to -c option */ 74 75 76 STATIC void options(int); 77 STATIC void minus_o(char *, int); 78 STATIC void setoption(int, int); 79 STATIC int getopts(char *, char *, char **, char ***, char **); 80 81 82 /* 83 * Process the shell command line arguments. 84 */ 85 86 void 87 procargs(int argc, char **argv) 88 { 89 size_t i; 90 91 argptr = argv; 92 if (argc > 0) 93 argptr++; 94 for (i = 0; i < NOPTS; i++) 95 optlist[i].val = 2; 96 options(1); 97 if (*argptr == NULL && minusc == NULL) 98 sflag = 1; 99 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1)) 100 iflag = 1; 101 if (iflag == 1 && sflag == 2) 102 iflag = 2; 103 if (mflag == 2) 104 mflag = iflag; 105 for (i = 0; i < NOPTS; i++) 106 if (optlist[i].val == 2) 107 optlist[i].val = 0; 108 #if DEBUG == 2 109 debug = 1; 110 #endif 111 arg0 = argv[0]; 112 if (sflag == 0 && minusc == NULL) { 113 commandname = argv[0]; 114 arg0 = *argptr++; 115 setinputfile(arg0, 0); 116 commandname = arg0; 117 } 118 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */ 119 if (minusc != NULL) { 120 if (argptr == NULL || *argptr == NULL) 121 error("Bad -c option"); 122 minusc = *argptr++; 123 if (*argptr != 0) 124 arg0 = *argptr++; 125 } 126 127 shellparam.p = argptr; 128 shellparam.reset = 1; 129 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ 130 while (*argptr) { 131 shellparam.nparam++; 132 argptr++; 133 } 134 optschanged(); 135 } 136 137 138 void 139 optschanged(void) 140 { 141 setinteractive(iflag); 142 #ifndef SMALL 143 histedit(); 144 #endif 145 setjobctl(mflag); 146 } 147 148 /* 149 * Process shell options. The global variable argptr contains a pointer 150 * to the argument list; we advance it past the options. 151 */ 152 153 STATIC void 154 options(int cmdline) 155 { 156 static char empty[] = ""; 157 char *p; 158 int val; 159 int c; 160 161 if (cmdline) 162 minusc = NULL; 163 while ((p = *argptr) != NULL) { 164 argptr++; 165 if ((c = *p++) == '-') { 166 val = 1; 167 if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) { 168 if (!cmdline) { 169 /* "-" means turn off -x and -v */ 170 if (p[0] == '\0') 171 xflag = vflag = 0; 172 /* "--" means reset params */ 173 else if (*argptr == NULL) 174 setparam(argptr); 175 } 176 break; /* "-" or "--" terminates options */ 177 } 178 } else if (c == '+') { 179 val = 0; 180 } else { 181 argptr--; 182 break; 183 } 184 while ((c = *p++) != '\0') { 185 if (c == 'c' && cmdline) { 186 /* command is after shell args*/ 187 minusc = empty; 188 } else if (c == 'o') { 189 minus_o(*argptr, val); 190 if (*argptr) 191 argptr++; 192 } else { 193 setoption(c, val); 194 } 195 } 196 } 197 } 198 199 static void 200 set_opt_val(size_t i, int val) 201 { 202 size_t j; 203 int flag; 204 205 if (val && (flag = optlist[i].opt_set)) { 206 /* some options (eg vi/emacs) are mutually exclusive */ 207 for (j = 0; j < NOPTS; j++) 208 if (optlist[j].opt_set == flag) 209 optlist[j].val = 0; 210 } 211 optlist[i].val = val; 212 #ifdef DEBUG 213 if (&optlist[i].val == &debug) 214 opentrace(); 215 #endif 216 } 217 218 STATIC void 219 minus_o(char *name, int val) 220 { 221 size_t i; 222 223 if (name == NULL) { 224 if (val) { 225 out1str("Current option settings\n"); 226 for (i = 0; i < NOPTS; i++) { 227 out1fmt("%-16s%s\n", optlist[i].name, 228 optlist[i].val ? "on" : "off"); 229 } 230 } else { 231 out1str("set"); 232 for (i = 0; i < NOPTS; i++) { 233 out1fmt(" %co %s", 234 "+-"[optlist[i].val], optlist[i].name); 235 } 236 out1str("\n"); 237 } 238 } else { 239 for (i = 0; i < NOPTS; i++) 240 if (equal(name, optlist[i].name)) { 241 set_opt_val(i, val); 242 return; 243 } 244 error("Illegal option -o %s", name); 245 } 246 } 247 248 249 STATIC void 250 setoption(int flag, int val) 251 { 252 size_t i; 253 254 for (i = 0; i < NOPTS; i++) 255 if (optlist[i].letter == flag) { 256 set_opt_val( i, val ); 257 return; 258 } 259 error("Illegal option -%c", flag); 260 /* NOTREACHED */ 261 } 262 263 264 265 #ifdef mkinit 266 INCLUDE "options.h" 267 268 SHELLPROC { 269 int i; 270 271 for (i = 0; optlist[i].name; i++) 272 optlist[i].val = 0; 273 optschanged(); 274 275 } 276 #endif 277 278 279 /* 280 * Set the shell parameters. 281 */ 282 283 void 284 setparam(char **argv) 285 { 286 char **newparam; 287 char **ap; 288 int nparam; 289 290 for (nparam = 0 ; argv[nparam] ; nparam++) 291 continue; 292 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap); 293 while (*argv) { 294 *ap++ = savestr(*argv++); 295 } 296 *ap = NULL; 297 freeparam(&shellparam); 298 shellparam.malloc = 1; 299 shellparam.nparam = nparam; 300 shellparam.p = newparam; 301 shellparam.optnext = NULL; 302 } 303 304 305 /* 306 * Free the list of positional parameters. 307 */ 308 309 void 310 freeparam(volatile struct shparam *param) 311 { 312 char **ap; 313 314 if (param->malloc) { 315 for (ap = param->p ; *ap ; ap++) 316 ckfree(*ap); 317 ckfree(param->p); 318 } 319 } 320 321 322 323 /* 324 * The shift builtin command. 325 */ 326 327 int 328 shiftcmd(int argc, char **argv) 329 { 330 int n; 331 char **ap1, **ap2; 332 333 n = 1; 334 if (argc > 1) 335 n = number(argv[1]); 336 if (n > shellparam.nparam) 337 error("can't shift that many"); 338 INTOFF; 339 shellparam.nparam -= n; 340 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) { 341 if (shellparam.malloc) 342 ckfree(*ap1); 343 } 344 ap2 = shellparam.p; 345 while ((*ap2++ = *ap1++) != NULL); 346 shellparam.optnext = NULL; 347 INTON; 348 return 0; 349 } 350 351 352 353 /* 354 * The set command builtin. 355 */ 356 357 int 358 setcmd(int argc, char **argv) 359 { 360 if (argc == 1) 361 return showvars(0, 0, 1); 362 INTOFF; 363 options(0); 364 optschanged(); 365 if (*argptr != NULL) { 366 setparam(argptr); 367 } 368 INTON; 369 return 0; 370 } 371 372 373 void 374 getoptsreset(value) 375 const char *value; 376 { 377 if (number(value) == 1) { 378 shellparam.optnext = NULL; 379 shellparam.reset = 1; 380 } 381 } 382 383 /* 384 * The getopts builtin. Shellparam.optnext points to the next argument 385 * to be processed. Shellparam.optptr points to the next character to 386 * be processed in the current argument. If shellparam.optnext is NULL, 387 * then it's the first time getopts has been called. 388 */ 389 390 int 391 getoptscmd(int argc, char **argv) 392 { 393 char **optbase; 394 395 if (argc < 3) 396 error("usage: getopts optstring var [arg]"); 397 else if (argc == 3) 398 optbase = shellparam.p; 399 else 400 optbase = &argv[3]; 401 402 if (shellparam.reset == 1) { 403 shellparam.optnext = optbase; 404 shellparam.optptr = NULL; 405 shellparam.reset = 0; 406 } 407 408 return getopts(argv[1], argv[2], optbase, &shellparam.optnext, 409 &shellparam.optptr); 410 } 411 412 STATIC int 413 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, char **optpptr) 414 { 415 char *p, *q; 416 char c = '?'; 417 int done = 0; 418 int ind = 0; 419 int err = 0; 420 char s[12]; 421 422 if ((p = *optpptr) == NULL || *p == '\0') { 423 /* Current word is done, advance */ 424 if (*optnext == NULL) 425 return 1; 426 p = **optnext; 427 if (p == NULL || *p != '-' || *++p == '\0') { 428 atend: 429 ind = *optnext - optfirst + 1; 430 *optnext = NULL; 431 p = NULL; 432 done = 1; 433 goto out; 434 } 435 (*optnext)++; 436 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 437 goto atend; 438 } 439 440 c = *p++; 441 for (q = optstr; *q != c; ) { 442 if (*q == '\0') { 443 if (optstr[0] == ':') { 444 s[0] = c; 445 s[1] = '\0'; 446 err |= setvarsafe("OPTARG", s, 0); 447 } else { 448 outfmt(&errout, "Illegal option -%c\n", c); 449 (void) unsetvar("OPTARG", 0); 450 } 451 c = '?'; 452 goto bad; 453 } 454 if (*++q == ':') 455 q++; 456 } 457 458 if (*++q == ':') { 459 if (*p == '\0' && (p = **optnext) == NULL) { 460 if (optstr[0] == ':') { 461 s[0] = c; 462 s[1] = '\0'; 463 err |= setvarsafe("OPTARG", s, 0); 464 c = ':'; 465 } else { 466 outfmt(&errout, "No arg for -%c option\n", c); 467 (void) unsetvar("OPTARG", 0); 468 c = '?'; 469 } 470 goto bad; 471 } 472 473 if (p == **optnext) 474 (*optnext)++; 475 err |= setvarsafe("OPTARG", p, 0); 476 p = NULL; 477 } else 478 err |= setvarsafe("OPTARG", "", 0); 479 ind = *optnext - optfirst + 1; 480 goto out; 481 482 bad: 483 ind = 1; 484 *optnext = NULL; 485 p = NULL; 486 out: 487 *optpptr = p; 488 fmtstr(s, sizeof(s), "%d", ind); 489 err |= setvarsafe("OPTIND", s, VNOFUNC); 490 s[0] = c; 491 s[1] = '\0'; 492 err |= setvarsafe(optvar, s, 0); 493 if (err) { 494 *optnext = NULL; 495 *optpptr = NULL; 496 flushall(); 497 exraise(EXERROR); 498 } 499 return done; 500 } 501 502 /* 503 * XXX - should get rid of. have all builtins use getopt(3). the 504 * library getopt must have the BSD extension static variable "optreset" 505 * otherwise it can't be used within the shell safely. 506 * 507 * Standard option processing (a la getopt) for builtin routines. The 508 * only argument that is passed to nextopt is the option string; the 509 * other arguments are unnecessary. It return the character, or '\0' on 510 * end of input. 511 */ 512 513 int 514 nextopt(const char *optstring) 515 { 516 char *p; 517 const char *q; 518 char c; 519 520 if ((p = optptr) == NULL || *p == '\0') { 521 p = *argptr; 522 if (p == NULL || *p != '-' || *++p == '\0') 523 return '\0'; 524 argptr++; 525 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 526 return '\0'; 527 } 528 c = *p++; 529 for (q = optstring ; *q != c ; ) { 530 if (*q == '\0') 531 error("Illegal option -%c", c); 532 if (*++q == ':') 533 q++; 534 } 535 if (*++q == ':') { 536 if (*p == '\0' && (p = *argptr++) == NULL) 537 error("No arg for -%c option", c); 538 optionarg = p; 539 p = NULL; 540 } 541 optptr = p; 542 return c; 543 } 544