1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)options.c 8.2 (Berkeley) 5/4/95"; 36 #endif 37 #endif /* not lint */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <signal.h> 42 #include <unistd.h> 43 #include <stdlib.h> 44 45 #include "shell.h" 46 #define DEFINE_OPTIONS 47 #include "options.h" 48 #undef DEFINE_OPTIONS 49 #include "nodes.h" /* for other header files */ 50 #include "eval.h" 51 #include "jobs.h" 52 #include "input.h" 53 #include "output.h" 54 #include "trap.h" 55 #include "var.h" 56 #include "memalloc.h" 57 #include "error.h" 58 #include "mystring.h" 59 #ifndef NO_HISTORY 60 #include "myhistedit.h" 61 #endif 62 63 char *arg0; /* value of $0 */ 64 struct shparam shellparam; /* current positional parameters */ 65 char **argptr; /* argument list for builtin commands */ 66 char *shoptarg; /* set by nextopt (like getopt) */ 67 char *optptr; /* used by nextopt */ 68 69 char *minusc; /* argument to -c option */ 70 71 72 STATIC void options(int); 73 STATIC void minus_o(char *, int); 74 STATIC void setoption(int, int); 75 STATIC int getopts(char *, char *, char **, char ***, char **); 76 77 78 /* 79 * Process the shell command line arguments. 80 */ 81 82 void 83 procargs(int argc, char **argv) 84 { 85 int i; 86 87 argptr = argv; 88 if (argc > 0) 89 argptr++; 90 for (i = 0; i < NOPTS; i++) 91 optlist[i].val = 2; 92 privileged = (getuid() != geteuid() || getgid() != getegid()); 93 options(1); 94 if (*argptr == NULL && minusc == NULL) 95 sflag = 1; 96 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1)) 97 iflag = 1; 98 if (mflag == 2) 99 mflag = iflag; 100 for (i = 0; i < NOPTS; i++) 101 if (optlist[i].val == 2) 102 optlist[i].val = 0; 103 arg0 = argv[0]; 104 if (sflag == 0 && minusc == NULL) { 105 commandname = arg0 = *argptr++; 106 setinputfile(commandname, 0); 107 } 108 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */ 109 if (argptr && minusc && *argptr) 110 arg0 = *argptr++; 111 112 shellparam.p = argptr; 113 shellparam.reset = 1; 114 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ 115 while (*argptr) { 116 shellparam.nparam++; 117 argptr++; 118 } 119 optschanged(); 120 } 121 122 123 void 124 optschanged(void) 125 { 126 setinteractive(iflag); 127 #ifndef NO_HISTORY 128 histedit(); 129 #endif 130 setjobctl(mflag); 131 } 132 133 /* 134 * Process shell options. The global variable argptr contains a pointer 135 * to the argument list; we advance it past the options. 136 */ 137 138 STATIC void 139 options(int cmdline) 140 { 141 char *p; 142 int val; 143 int c; 144 145 if (cmdline) 146 minusc = NULL; 147 while ((p = *argptr) != NULL) { 148 argptr++; 149 if ((c = *p++) == '-') { 150 val = 1; 151 /* A "-" or "--" terminates options */ 152 if (p[0] == '\0') 153 goto end_options1; 154 if (p[0] == '-' && p[1] == '\0') 155 goto end_options2; 156 } else if (c == '+') { 157 val = 0; 158 } else { 159 argptr--; 160 break; 161 } 162 while ((c = *p++) != '\0') { 163 if (c == 'c' && cmdline) { 164 char *q; 165 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */ 166 if (*p == '\0') 167 #endif 168 q = *argptr++; 169 if (q == NULL || minusc != NULL) 170 error("Bad -c option"); 171 minusc = q; 172 #ifdef NOHACK 173 break; 174 #endif 175 } else if (c == 'o') { 176 minus_o(*argptr, val); 177 if (*argptr) 178 argptr++; 179 } else { 180 if (c == 'p' && !val && privileged) { 181 (void) setuid(getuid()); 182 (void) setgid(getgid()); 183 } 184 setoption(c, val); 185 } 186 } 187 } 188 return; 189 190 /* When processing `set', a single "-" means turn off -x and -v */ 191 end_options1: 192 if (!cmdline) { 193 xflag = vflag = 0; 194 return; 195 } 196 197 /* 198 * When processing `set', a "--" means the remaining arguments 199 * replace the positional parameters in the active shell. If 200 * there are no remaining options, then all the positional 201 * parameters are cleared (equivalent to doing ``shift $#''). 202 */ 203 end_options2: 204 if (!cmdline) { 205 if (*argptr == NULL) 206 setparam(argptr); 207 return; 208 } 209 210 /* 211 * At this point we are processing options given to 'sh' on a command 212 * line. If an end-of-options marker ("-" or "--") is followed by an 213 * arg of "#", then skip over all remaining arguments. Some scripting 214 * languages (e.g.: perl) document that /bin/sh will implement this 215 * behavior, and they recommend that users take advantage of it to 216 * solve certain issues that can come up when writing a perl script. 217 * Yes, this feature is in /bin/sh to help users write perl scripts. 218 */ 219 p = *argptr; 220 if (p != NULL && p[0] == '#' && p[1] == '\0') { 221 while (*argptr != NULL) 222 argptr++; 223 /* We need to keep the final argument */ 224 argptr--; 225 } 226 } 227 228 STATIC void 229 minus_o(char *name, int val) 230 { 231 int doneset, i; 232 233 if (name == NULL) { 234 if (val) { 235 /* "Pretty" output. */ 236 out1str("Current option settings\n"); 237 for (i = 0; i < NOPTS; i++) 238 out1fmt("%-16s%s\n", optlist[i].name, 239 optlist[i].val ? "on" : "off"); 240 } else { 241 /* Output suitable for re-input to shell. */ 242 for (doneset = i = 0; i < NOPTS; i++) 243 if (optlist[i].val) { 244 if (!doneset) { 245 out1str("set"); 246 doneset = 1; 247 } 248 out1fmt(" -o %s", optlist[i].name); 249 } 250 if (doneset) 251 out1c('\n'); 252 } 253 } else { 254 for (i = 0; i < NOPTS; i++) 255 if (equal(name, optlist[i].name)) { 256 if (!val && privileged && equal(name, "privileged")) { 257 (void) setuid(getuid()); 258 (void) setgid(getgid()); 259 } 260 setoption(optlist[i].letter, val); 261 return; 262 } 263 error("Illegal option -o %s", name); 264 } 265 } 266 267 268 STATIC void 269 setoption(int flag, int val) 270 { 271 int i; 272 273 for (i = 0; i < NOPTS; i++) 274 if (optlist[i].letter == flag) { 275 optlist[i].val = val; 276 if (val) { 277 /* #%$ hack for ksh semantics */ 278 if (flag == 'V') 279 Eflag = 0; 280 else if (flag == 'E') 281 Vflag = 0; 282 } 283 return; 284 } 285 error("Illegal option -%c", flag); 286 } 287 288 289 290 #ifdef mkinit 291 INCLUDE "options.h" 292 293 SHELLPROC { 294 int i; 295 296 for (i = 0; i < NOPTS; i++) 297 optlist[i].val = 0; 298 optschanged(); 299 300 } 301 #endif 302 303 304 /* 305 * Set the shell parameters. 306 */ 307 308 void 309 setparam(char **argv) 310 { 311 char **newparam; 312 char **ap; 313 int nparam; 314 315 for (nparam = 0 ; argv[nparam] ; nparam++); 316 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap); 317 while (*argv) { 318 *ap++ = savestr(*argv++); 319 } 320 *ap = NULL; 321 freeparam(&shellparam); 322 shellparam.malloc = 1; 323 shellparam.nparam = nparam; 324 shellparam.p = newparam; 325 shellparam.optnext = NULL; 326 } 327 328 329 /* 330 * Free the list of positional parameters. 331 */ 332 333 void 334 freeparam(struct shparam *param) 335 { 336 char **ap; 337 338 if (param->malloc) { 339 for (ap = param->p ; *ap ; ap++) 340 ckfree(*ap); 341 ckfree(param->p); 342 } 343 } 344 345 346 347 /* 348 * The shift builtin command. 349 */ 350 351 int 352 shiftcmd(int argc, char **argv) 353 { 354 int n; 355 char **ap1, **ap2; 356 357 n = 1; 358 if (argc > 1) 359 n = number(argv[1]); 360 if (n > shellparam.nparam) 361 error("can't shift that many"); 362 INTOFF; 363 shellparam.nparam -= n; 364 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) { 365 if (shellparam.malloc) 366 ckfree(*ap1); 367 } 368 ap2 = shellparam.p; 369 while ((*ap2++ = *ap1++) != NULL); 370 shellparam.optnext = NULL; 371 INTON; 372 return 0; 373 } 374 375 376 377 /* 378 * The set command builtin. 379 */ 380 381 int 382 setcmd(int argc, char **argv) 383 { 384 if (argc == 1) 385 return showvarscmd(argc, argv); 386 INTOFF; 387 options(0); 388 optschanged(); 389 if (*argptr != NULL) { 390 setparam(argptr); 391 } 392 INTON; 393 return 0; 394 } 395 396 397 void 398 getoptsreset(const char *value) 399 { 400 if (number(value) == 1) { 401 shellparam.optnext = NULL; 402 shellparam.reset = 1; 403 } 404 } 405 406 /* 407 * The getopts builtin. Shellparam.optnext points to the next argument 408 * to be processed. Shellparam.optptr points to the next character to 409 * be processed in the current argument. If shellparam.optnext is NULL, 410 * then it's the first time getopts has been called. 411 */ 412 413 int 414 getoptscmd(int argc, char **argv) 415 { 416 char **optbase = NULL; 417 418 if (argc < 3) 419 error("usage: getopts optstring var [arg]"); 420 else if (argc == 3) 421 optbase = shellparam.p; 422 else 423 optbase = &argv[3]; 424 425 if (shellparam.reset == 1) { 426 shellparam.optnext = optbase; 427 shellparam.optptr = NULL; 428 shellparam.reset = 0; 429 } 430 431 return getopts(argv[1], argv[2], optbase, &shellparam.optnext, 432 &shellparam.optptr); 433 } 434 435 STATIC int 436 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, 437 char **optptr) 438 { 439 char *p, *q; 440 char c = '?'; 441 int done = 0; 442 int ind = 0; 443 int err = 0; 444 char s[10]; 445 446 if ((p = *optptr) == NULL || *p == '\0') { 447 /* Current word is done, advance */ 448 if (*optnext == NULL) 449 return 1; 450 p = **optnext; 451 if (p == NULL || *p != '-' || *++p == '\0') { 452 atend: 453 ind = *optnext - optfirst + 1; 454 *optnext = NULL; 455 p = NULL; 456 done = 1; 457 goto out; 458 } 459 (*optnext)++; 460 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 461 goto atend; 462 } 463 464 c = *p++; 465 for (q = optstr; *q != c; ) { 466 if (*q == '\0') { 467 if (optstr[0] == ':') { 468 s[0] = c; 469 s[1] = '\0'; 470 err |= setvarsafe("OPTARG", s, 0); 471 } 472 else { 473 out1fmt("Illegal option -%c\n", c); 474 (void) unsetvar("OPTARG"); 475 } 476 c = '?'; 477 goto bad; 478 } 479 if (*++q == ':') 480 q++; 481 } 482 483 if (*++q == ':') { 484 if (*p == '\0' && (p = **optnext) == NULL) { 485 if (optstr[0] == ':') { 486 s[0] = c; 487 s[1] = '\0'; 488 err |= setvarsafe("OPTARG", s, 0); 489 c = ':'; 490 } 491 else { 492 out1fmt("No arg for -%c option\n", c); 493 (void) unsetvar("OPTARG"); 494 c = '?'; 495 } 496 goto bad; 497 } 498 499 if (p == **optnext) 500 (*optnext)++; 501 setvarsafe("OPTARG", p, 0); 502 p = NULL; 503 } 504 else 505 setvarsafe("OPTARG", "", 0); 506 ind = *optnext - optfirst + 1; 507 goto out; 508 509 bad: 510 ind = 1; 511 *optnext = NULL; 512 p = NULL; 513 out: 514 *optptr = p; 515 fmtstr(s, sizeof(s), "%d", ind); 516 err |= setvarsafe("OPTIND", s, VNOFUNC); 517 s[0] = c; 518 s[1] = '\0'; 519 err |= setvarsafe(optvar, s, 0); 520 if (err) { 521 *optnext = NULL; 522 *optptr = NULL; 523 flushall(); 524 exraise(EXERROR); 525 } 526 return done; 527 } 528 529 /* 530 * XXX - should get rid of. have all builtins use getopt(3). the 531 * library getopt must have the BSD extension static variable "optreset" 532 * otherwise it can't be used within the shell safely. 533 * 534 * Standard option processing (a la getopt) for builtin routines. The 535 * only argument that is passed to nextopt is the option string; the 536 * other arguments are unnecessary. It return the character, or '\0' on 537 * end of input. 538 */ 539 540 int 541 nextopt(char *optstring) 542 { 543 char *p, *q; 544 char c; 545 546 if ((p = optptr) == NULL || *p == '\0') { 547 p = *argptr; 548 if (p == NULL || *p != '-' || *++p == '\0') 549 return '\0'; 550 argptr++; 551 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 552 return '\0'; 553 } 554 c = *p++; 555 for (q = optstring ; *q != c ; ) { 556 if (*q == '\0') 557 error("Illegal option -%c", c); 558 if (*++q == ':') 559 q++; 560 } 561 if (*++q == ':') { 562 if (*p == '\0' && (p = *argptr++) == NULL) 563 error("No arg for -%c option", c); 564 shoptarg = p; 565 p = NULL; 566 } 567 optptr = p; 568 return c; 569 } 570