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 *nextopt_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 != 0 && sflag == 1 && isatty(0) && isatty(1)) { 97 iflag = 1; 98 if (Eflag == 2) 99 Eflag = 1; 100 } 101 if (mflag == 2) 102 mflag = iflag; 103 for (i = 0; i < NOPTS; i++) 104 if (optlist[i].val == 2) 105 optlist[i].val = 0; 106 arg0 = argv[0]; 107 if (sflag == 0 && minusc == NULL) { 108 commandname = arg0 = *argptr++; 109 setinputfile(commandname, 0); 110 } 111 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */ 112 if (argptr && minusc && *argptr) 113 arg0 = *argptr++; 114 115 shellparam.p = argptr; 116 shellparam.reset = 1; 117 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ 118 while (*argptr) { 119 shellparam.nparam++; 120 argptr++; 121 } 122 optschanged(); 123 } 124 125 126 void 127 optschanged(void) 128 { 129 setinteractive(iflag); 130 #ifndef NO_HISTORY 131 histedit(); 132 #endif 133 setjobctl(mflag); 134 } 135 136 /* 137 * Process shell options. The global variable argptr contains a pointer 138 * to the argument list; we advance it past the options. 139 */ 140 141 static void 142 options(int cmdline) 143 { 144 char *kp, *p; 145 int val; 146 int c; 147 148 if (cmdline) 149 minusc = NULL; 150 while ((p = *argptr) != NULL) { 151 argptr++; 152 if ((c = *p++) == '-') { 153 val = 1; 154 /* A "-" or "--" terminates options */ 155 if (p[0] == '\0') 156 goto end_options1; 157 if (p[0] == '-' && p[1] == '\0') 158 goto end_options2; 159 /** 160 * For the benefit of `#!' lines in shell scripts, 161 * treat a string of '-- *#.*' the same as '--'. 162 * This is needed so that a script starting with: 163 * #!/bin/sh -- # -*- perl -*- 164 * will continue to work after a change is made to 165 * kern/imgact_shell.c to NOT token-ize the options 166 * specified on a '#!' line. A bit of a kludge, 167 * but that trick is recommended in documentation 168 * for some scripting languages, and we might as 169 * well continue to support it. 170 */ 171 if (p[0] == '-') { 172 kp = p + 1; 173 while (*kp == ' ' || *kp == '\t') 174 kp++; 175 if (*kp == '#' || *kp == '\0') 176 goto end_options2; 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 char *q; 187 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */ 188 if (*p == '\0') 189 #endif 190 q = *argptr++; 191 if (q == NULL || minusc != NULL) 192 error("Bad -c option"); 193 minusc = q; 194 #ifdef NOHACK 195 break; 196 #endif 197 } else if (c == 'o') { 198 minus_o(*argptr, val); 199 if (*argptr) 200 argptr++; 201 } else { 202 if (c == 'p' && !val && privileged) { 203 (void) setuid(getuid()); 204 (void) setgid(getgid()); 205 } 206 setoption(c, val); 207 } 208 } 209 } 210 return; 211 212 /* When processing `set', a single "-" means turn off -x and -v */ 213 end_options1: 214 if (!cmdline) { 215 xflag = vflag = 0; 216 return; 217 } 218 219 /* 220 * When processing `set', a "--" means the remaining arguments 221 * replace the positional parameters in the active shell. If 222 * there are no remaining options, then all the positional 223 * parameters are cleared (equivalent to doing ``shift $#''). 224 */ 225 end_options2: 226 if (!cmdline) { 227 if (*argptr == NULL) 228 setparam(argptr); 229 return; 230 } 231 232 /* 233 * At this point we are processing options given to 'sh' on a command 234 * line. If an end-of-options marker ("-" or "--") is followed by an 235 * arg of "#", then skip over all remaining arguments. Some scripting 236 * languages (e.g.: perl) document that /bin/sh will implement this 237 * behavior, and they recommend that users take advantage of it to 238 * solve certain issues that can come up when writing a perl script. 239 * Yes, this feature is in /bin/sh to help users write perl scripts. 240 */ 241 p = *argptr; 242 if (p != NULL && p[0] == '#' && p[1] == '\0') { 243 while (*argptr != NULL) 244 argptr++; 245 /* We need to keep the final argument */ 246 argptr--; 247 } 248 } 249 250 static void 251 minus_o(char *name, int val) 252 { 253 int i; 254 255 if (name == NULL) { 256 if (val) { 257 /* "Pretty" output. */ 258 out1str("Current option settings\n"); 259 for (i = 0; i < NOPTS; i++) 260 out1fmt("%-16s%s\n", optlist[i].name, 261 optlist[i].val ? "on" : "off"); 262 } else { 263 /* Output suitable for re-input to shell. */ 264 for (i = 0; i < NOPTS; i++) 265 out1fmt("%s %co %s%s", 266 i % 6 == 0 ? "set" : "", 267 optlist[i].val ? '-' : '+', 268 optlist[i].name, 269 i % 6 == 5 || i == NOPTS - 1 ? "\n" : ""); 270 } 271 } else { 272 for (i = 0; i < NOPTS; i++) 273 if (equal(name, optlist[i].name)) { 274 if (!val && privileged && equal(name, "privileged")) { 275 (void) setuid(getuid()); 276 (void) setgid(getgid()); 277 } 278 setoption(optlist[i].letter, val); 279 return; 280 } 281 error("Illegal option -o %s", name); 282 } 283 } 284 285 286 static void 287 setoption(int flag, int val) 288 { 289 int i; 290 291 for (i = 0; i < NOPTS; i++) 292 if (optlist[i].letter == flag) { 293 optlist[i].val = val; 294 if (val) { 295 /* #%$ hack for ksh semantics */ 296 if (flag == 'V') 297 Eflag = 0; 298 else if (flag == 'E') 299 Vflag = 0; 300 } 301 return; 302 } 303 error("Illegal option -%c", flag); 304 } 305 306 307 308 #ifdef mkinit 309 INCLUDE "options.h" 310 311 SHELLPROC { 312 int i; 313 314 for (i = 0; i < NOPTS; i++) 315 optlist[i].val = 0; 316 optschanged(); 317 318 } 319 #endif 320 321 322 /* 323 * Set the shell parameters. 324 */ 325 326 void 327 setparam(char **argv) 328 { 329 char **newparam; 330 char **ap; 331 int nparam; 332 333 for (nparam = 0 ; argv[nparam] ; nparam++); 334 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap); 335 while (*argv) { 336 *ap++ = savestr(*argv++); 337 } 338 *ap = NULL; 339 freeparam(&shellparam); 340 shellparam.malloc = 1; 341 shellparam.nparam = nparam; 342 shellparam.p = newparam; 343 shellparam.reset = 1; 344 shellparam.optnext = NULL; 345 } 346 347 348 /* 349 * Free the list of positional parameters. 350 */ 351 352 void 353 freeparam(struct shparam *param) 354 { 355 char **ap; 356 357 if (param->malloc) { 358 for (ap = param->p ; *ap ; ap++) 359 ckfree(*ap); 360 ckfree(param->p); 361 } 362 } 363 364 365 366 /* 367 * The shift builtin command. 368 */ 369 370 int 371 shiftcmd(int argc, char **argv) 372 { 373 int n; 374 char **ap1, **ap2; 375 376 n = 1; 377 if (argc > 1) 378 n = number(argv[1]); 379 if (n > shellparam.nparam) 380 return 1; 381 INTOFF; 382 shellparam.nparam -= n; 383 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) { 384 if (shellparam.malloc) 385 ckfree(*ap1); 386 } 387 ap2 = shellparam.p; 388 while ((*ap2++ = *ap1++) != NULL); 389 shellparam.reset = 1; 390 INTON; 391 return 0; 392 } 393 394 395 396 /* 397 * The set command builtin. 398 */ 399 400 int 401 setcmd(int argc, char **argv) 402 { 403 if (argc == 1) 404 return showvarscmd(argc, argv); 405 INTOFF; 406 options(0); 407 optschanged(); 408 if (*argptr != NULL) { 409 setparam(argptr); 410 } 411 INTON; 412 return 0; 413 } 414 415 416 void 417 getoptsreset(const char *value) 418 { 419 if (number(value) == 1) { 420 shellparam.reset = 1; 421 } 422 } 423 424 /* 425 * The getopts builtin. Shellparam.optnext points to the next argument 426 * to be processed. Shellparam.optptr points to the next character to 427 * be processed in the current argument. If shellparam.optnext is NULL, 428 * then it's the first time getopts has been called. 429 */ 430 431 int 432 getoptscmd(int argc, char **argv) 433 { 434 char **optbase = NULL; 435 436 if (argc < 3) 437 error("usage: getopts optstring var [arg]"); 438 else if (argc == 3) 439 optbase = shellparam.p; 440 else 441 optbase = &argv[3]; 442 443 if (shellparam.reset == 1) { 444 shellparam.optnext = optbase; 445 shellparam.optptr = NULL; 446 shellparam.reset = 0; 447 } 448 449 return getopts(argv[1], argv[2], optbase, &shellparam.optnext, 450 &shellparam.optptr); 451 } 452 453 static int 454 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, 455 char **optptr) 456 { 457 char *p, *q; 458 char c = '?'; 459 int done = 0; 460 int ind = 0; 461 int err = 0; 462 char s[10]; 463 464 if ((p = *optptr) == NULL || *p == '\0') { 465 /* Current word is done, advance */ 466 if (*optnext == NULL) 467 return 1; 468 p = **optnext; 469 if (p == NULL || *p != '-' || *++p == '\0') { 470 atend: 471 ind = *optnext - optfirst + 1; 472 *optnext = NULL; 473 p = NULL; 474 done = 1; 475 goto out; 476 } 477 (*optnext)++; 478 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 479 goto atend; 480 } 481 482 c = *p++; 483 for (q = optstr; *q != c; ) { 484 if (*q == '\0') { 485 if (optstr[0] == ':') { 486 s[0] = c; 487 s[1] = '\0'; 488 err |= setvarsafe("OPTARG", s, 0); 489 } 490 else { 491 out1fmt("Illegal option -%c\n", c); 492 (void) unsetvar("OPTARG"); 493 } 494 c = '?'; 495 goto bad; 496 } 497 if (*++q == ':') 498 q++; 499 } 500 501 if (*++q == ':') { 502 if (*p == '\0' && (p = **optnext) == NULL) { 503 if (optstr[0] == ':') { 504 s[0] = c; 505 s[1] = '\0'; 506 err |= setvarsafe("OPTARG", s, 0); 507 c = ':'; 508 } 509 else { 510 out1fmt("No arg for -%c option\n", c); 511 (void) unsetvar("OPTARG"); 512 c = '?'; 513 } 514 goto bad; 515 } 516 517 if (p == **optnext) 518 (*optnext)++; 519 setvarsafe("OPTARG", p, 0); 520 p = NULL; 521 } 522 else 523 setvarsafe("OPTARG", "", 0); 524 ind = *optnext - optfirst + 1; 525 goto out; 526 527 bad: 528 ind = 1; 529 *optnext = NULL; 530 p = NULL; 531 out: 532 *optptr = p; 533 fmtstr(s, sizeof(s), "%d", ind); 534 err |= setvarsafe("OPTIND", s, VNOFUNC); 535 s[0] = c; 536 s[1] = '\0'; 537 err |= setvarsafe(optvar, s, 0); 538 if (err) { 539 *optnext = NULL; 540 *optptr = NULL; 541 flushall(); 542 exraise(EXERROR); 543 } 544 return done; 545 } 546 547 /* 548 * XXX - should get rid of. have all builtins use getopt(3). the 549 * library getopt must have the BSD extension static variable "optreset" 550 * otherwise it can't be used within the shell safely. 551 * 552 * Standard option processing (a la getopt) for builtin routines. The 553 * only argument that is passed to nextopt is the option string; the 554 * other arguments are unnecessary. It return the character, or '\0' on 555 * end of input. 556 */ 557 558 int 559 nextopt(const char *optstring) 560 { 561 char *p; 562 const char *q; 563 char c; 564 565 if ((p = nextopt_optptr) == NULL || *p == '\0') { 566 p = *argptr; 567 if (p == NULL || *p != '-' || *++p == '\0') 568 return '\0'; 569 argptr++; 570 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 571 return '\0'; 572 } 573 c = *p++; 574 for (q = optstring ; *q != c ; ) { 575 if (*q == '\0') 576 error("Illegal option -%c", c); 577 if (*++q == ':') 578 q++; 579 } 580 if (*++q == ':') { 581 if (*p == '\0' && (p = *argptr++) == NULL) 582 error("No arg for -%c option", c); 583 shoptarg = p; 584 p = NULL; 585 } 586 nextopt_optptr = p; 587 return c; 588 } 589