1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 #ifndef lint 36 #if 0 37 static char sccsid[] = "@(#)options.c 8.2 (Berkeley) 5/4/95"; 38 #endif 39 #endif /* not lint */ 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include <signal.h> 44 #include <unistd.h> 45 #include <stdlib.h> 46 47 #include "shell.h" 48 #define DEFINE_OPTIONS 49 #include "options.h" 50 #undef DEFINE_OPTIONS 51 #include "nodes.h" /* for other header files */ 52 #include "eval.h" 53 #include "jobs.h" 54 #include "input.h" 55 #include "output.h" 56 #include "trap.h" 57 #include "var.h" 58 #include "memalloc.h" 59 #include "error.h" 60 #include "mystring.h" 61 #include "builtins.h" 62 #ifndef NO_HISTORY 63 #include "myhistedit.h" 64 #endif 65 66 char *arg0; /* value of $0 */ 67 struct shparam shellparam; /* current positional parameters */ 68 char **argptr; /* argument list for builtin commands */ 69 char *shoptarg; /* set by nextopt (like getopt) */ 70 char *nextopt_optptr; /* used by nextopt */ 71 72 char *minusc; /* argument to -c option */ 73 74 75 static void options(int); 76 static void minus_o(char *, int); 77 static void setoption(int, int); 78 static void setoptionbyindex(int, int); 79 static void setparam(int, char **); 80 static int getopts(char *, char *, char **, char ***, char **); 81 82 83 /* 84 * Process the shell command line arguments. 85 */ 86 87 void 88 procargs(int argc, char **argv) 89 { 90 int i; 91 char *scriptname; 92 93 argptr = argv; 94 if (argc > 0) 95 argptr++; 96 for (i = 0; i < NOPTS; i++) 97 optval[i] = 2; 98 privileged = (getuid() != geteuid() || getgid() != getegid()); 99 options(1); 100 if (*argptr == NULL && minusc == NULL) 101 sflag = 1; 102 if (iflag != 0 && sflag == 1 && isatty(0) && isatty(1)) { 103 iflag = 1; 104 if (Eflag == 2) 105 Eflag = 1; 106 } 107 if (mflag == 2) 108 mflag = iflag; 109 for (i = 0; i < NOPTS; i++) 110 if (optval[i] == 2) 111 optval[i] = 0; 112 arg0 = argv[0]; 113 if (sflag == 0 && minusc == NULL) { 114 scriptname = *argptr++; 115 setinputfile(scriptname, 0, -1 /* verify */); 116 commandname = arg0 = scriptname; 117 } 118 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */ 119 if (argptr && minusc && *argptr) 120 arg0 = *argptr++; 121 122 shellparam.p = argptr; 123 shellparam.reset = 1; 124 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ 125 while (*argptr) { 126 shellparam.nparam++; 127 argptr++; 128 } 129 optschanged(); 130 } 131 132 133 void 134 optschanged(void) 135 { 136 setinteractive(); 137 #ifndef NO_HISTORY 138 histedit(); 139 #endif 140 setjobctl(mflag); 141 } 142 143 /* 144 * Process shell options. The global variable argptr contains a pointer 145 * to the argument list; we advance it past the options. 146 * If cmdline is true, process the shell's argv; otherwise, process arguments 147 * to the set special builtin. 148 */ 149 150 static void 151 options(int cmdline) 152 { 153 char *kp, *p; 154 int val; 155 int c; 156 157 if (cmdline) 158 minusc = NULL; 159 while ((p = *argptr) != NULL) { 160 argptr++; 161 if ((c = *p++) == '-') { 162 val = 1; 163 /* A "-" or "--" terminates options */ 164 if (p[0] == '\0') 165 goto end_options1; 166 if (p[0] == '-' && p[1] == '\0') 167 goto end_options2; 168 /** 169 * For the benefit of `#!' lines in shell scripts, 170 * treat a string of '-- *#.*' the same as '--'. 171 * This is needed so that a script starting with: 172 * #!/bin/sh -- # -*- perl -*- 173 * will continue to work after a change is made to 174 * kern/imgact_shell.c to NOT token-ize the options 175 * specified on a '#!' line. A bit of a kludge, 176 * but that trick is recommended in documentation 177 * for some scripting languages, and we might as 178 * well continue to support it. 179 */ 180 if (p[0] == '-') { 181 kp = p + 1; 182 while (*kp == ' ' || *kp == '\t') 183 kp++; 184 if (*kp == '#' || *kp == '\0') 185 goto end_options2; 186 } 187 } else if (c == '+') { 188 val = 0; 189 } else { 190 argptr--; 191 break; 192 } 193 while ((c = *p++) != '\0') { 194 if (c == 'c' && cmdline) { 195 char *q; 196 197 q = *argptr++; 198 if (q == NULL || minusc != NULL) 199 error("Bad -c option"); 200 minusc = q; 201 } else if (c == 'o') { 202 minus_o(*argptr, val); 203 if (*argptr) 204 argptr++; 205 } else 206 setoption(c, val); 207 } 208 } 209 return; 210 211 /* When processing `set', a single "-" means turn off -x and -v */ 212 end_options1: 213 if (!cmdline) { 214 xflag = vflag = 0; 215 return; 216 } 217 218 /* 219 * When processing `set', a "--" means the remaining arguments 220 * replace the positional parameters in the active shell. If 221 * there are no remaining options, then all the positional 222 * parameters are cleared (equivalent to doing ``shift $#''). 223 */ 224 end_options2: 225 if (!cmdline) { 226 if (*argptr == NULL) 227 setparam(0, argptr); 228 return; 229 } 230 231 /* 232 * At this point we are processing options given to 'sh' on a command 233 * line. If an end-of-options marker ("-" or "--") is followed by an 234 * arg of "#", then skip over all remaining arguments. Some scripting 235 * languages (e.g.: perl) document that /bin/sh will implement this 236 * behavior, and they recommend that users take advantage of it to 237 * solve certain issues that can come up when writing a perl script. 238 * Yes, this feature is in /bin/sh to help users write perl scripts. 239 */ 240 p = *argptr; 241 if (p != NULL && p[0] == '#' && p[1] == '\0') { 242 while (*argptr != NULL) 243 argptr++; 244 /* We need to keep the final argument */ 245 argptr--; 246 } 247 } 248 249 static void 250 minus_o(char *name, int val) 251 { 252 int i; 253 const unsigned char *on; 254 size_t len; 255 256 if (name == NULL) { 257 if (val) { 258 /* "Pretty" output. */ 259 out1str("Current option settings\n"); 260 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1) 261 out1fmt("%-16.*s%s\n", *on, on + 1, 262 optval[i] ? "on" : "off"); 263 } else { 264 /* Output suitable for re-input to shell. */ 265 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1) 266 out1fmt("%s %co %.*s%s", 267 i % 6 == 0 ? "set" : "", 268 optval[i] ? '-' : '+', 269 *on, on + 1, 270 i % 6 == 5 || i == NOPTS - 1 ? "\n" : ""); 271 } 272 } else { 273 len = strlen(name); 274 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1) 275 if (*on == len && memcmp(on + 1, name, len) == 0) { 276 setoptionbyindex(i, val); 277 return; 278 } 279 error("Illegal option -o %s", name); 280 } 281 } 282 283 284 static void 285 setoptionbyindex(int idx, int val) 286 { 287 if (&optval[idx] == &privileged && !val && privileged) { 288 if (setgid(getgid()) == -1) 289 error("setgid"); 290 if (setuid(getuid()) == -1) 291 error("setuid"); 292 } 293 optval[idx] = val; 294 if (val) { 295 /* #%$ hack for ksh semantics */ 296 if (&optval[idx] == &Vflag) 297 Eflag = 0; 298 else if (&optval[idx] == &Eflag) 299 Vflag = 0; 300 } 301 } 302 303 static void 304 setoption(int flag, int val) 305 { 306 int i; 307 308 for (i = 0; i < NSHORTOPTS; i++) 309 if (optletter[i] == flag) { 310 setoptionbyindex(i, val); 311 return; 312 } 313 error("Illegal option -%c", flag); 314 } 315 316 317 /* 318 * Set the shell parameters. 319 */ 320 321 static void 322 setparam(int argc, char **argv) 323 { 324 char **newparam; 325 char **ap; 326 327 ap = newparam = ckmalloc((argc + 1) * sizeof *ap); 328 while (*argv) { 329 *ap++ = savestr(*argv++); 330 } 331 *ap = NULL; 332 freeparam(&shellparam); 333 shellparam.malloc = 1; 334 shellparam.nparam = argc; 335 shellparam.p = newparam; 336 shellparam.optp = NULL; 337 shellparam.reset = 1; 338 shellparam.optnext = NULL; 339 } 340 341 342 /* 343 * Free the list of positional parameters. 344 */ 345 346 void 347 freeparam(struct shparam *param) 348 { 349 char **ap; 350 351 if (param->malloc) { 352 for (ap = param->p ; *ap ; ap++) 353 ckfree(*ap); 354 ckfree(param->p); 355 } 356 if (param->optp) { 357 for (ap = param->optp ; *ap ; ap++) 358 ckfree(*ap); 359 ckfree(param->optp); 360 } 361 } 362 363 364 365 /* 366 * The shift builtin command. 367 */ 368 369 int 370 shiftcmd(int argc, char **argv) 371 { 372 int i, n; 373 374 n = 1; 375 if (argc > 1) 376 n = number(argv[1]); 377 if (n > shellparam.nparam) 378 return 1; 379 INTOFF; 380 shellparam.nparam -= n; 381 if (shellparam.malloc) 382 for (i = 0; i < n; i++) 383 ckfree(shellparam.p[i]); 384 memmove(shellparam.p, shellparam.p + n, 385 (shellparam.nparam + 1) * sizeof(shellparam.p[0])); 386 shellparam.reset = 1; 387 INTON; 388 return 0; 389 } 390 391 392 393 /* 394 * The set builtin command. 395 */ 396 397 int 398 setcmd(int argc, char **argv) 399 { 400 if (argc == 1) 401 return showvarscmd(argc, argv); 402 INTOFF; 403 options(0); 404 optschanged(); 405 if (*argptr != NULL) { 406 setparam(argc - (argptr - argv), argptr); 407 } 408 INTON; 409 return 0; 410 } 411 412 413 void 414 getoptsreset(const char *value) 415 { 416 while (*value == '0') 417 value++; 418 if (strcmp(value, "1") == 0) 419 shellparam.reset = 1; 420 } 421 422 /* 423 * The getopts builtin. Shellparam.optnext points to the next argument 424 * to be processed. Shellparam.optptr points to the next character to 425 * be processed in the current argument. If shellparam.optnext is NULL, 426 * then it's the first time getopts has been called. 427 */ 428 429 int 430 getoptscmd(int argc, char **argv) 431 { 432 char **optbase = NULL, **ap; 433 int i; 434 435 if (argc < 3) 436 error("usage: getopts optstring var [arg]"); 437 438 if (shellparam.reset == 1) { 439 INTOFF; 440 if (shellparam.optp) { 441 for (ap = shellparam.optp ; *ap ; ap++) 442 ckfree(*ap); 443 ckfree(shellparam.optp); 444 shellparam.optp = NULL; 445 } 446 if (argc > 3) { 447 shellparam.optp = ckmalloc((argc - 2) * sizeof *ap); 448 memset(shellparam.optp, '\0', (argc - 2) * sizeof *ap); 449 for (i = 0; i < argc - 3; i++) 450 shellparam.optp[i] = savestr(argv[i + 3]); 451 } 452 INTON; 453 optbase = argc == 3 ? shellparam.p : shellparam.optp; 454 shellparam.optnext = optbase; 455 shellparam.optptr = NULL; 456 shellparam.reset = 0; 457 } else 458 optbase = shellparam.optp ? shellparam.optp : shellparam.p; 459 460 return getopts(argv[1], argv[2], optbase, &shellparam.optnext, 461 &shellparam.optptr); 462 } 463 464 static int 465 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, 466 char **optptr) 467 { 468 char *p, *q; 469 char c = '?'; 470 int done = 0; 471 int ind = 0; 472 int err = 0; 473 char s[10]; 474 const char *newoptarg = NULL; 475 476 if ((p = *optptr) == NULL || *p == '\0') { 477 /* Current word is done, advance */ 478 if (*optnext == NULL) 479 return 1; 480 p = **optnext; 481 if (p == NULL || *p != '-' || *++p == '\0') { 482 atend: 483 ind = *optnext - optfirst + 1; 484 *optnext = NULL; 485 p = NULL; 486 done = 1; 487 goto out; 488 } 489 (*optnext)++; 490 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 491 goto atend; 492 } 493 494 c = *p++; 495 for (q = optstr; *q != c; ) { 496 if (*q == '\0') { 497 if (optstr[0] == ':') { 498 s[0] = c; 499 s[1] = '\0'; 500 newoptarg = s; 501 } 502 else 503 out2fmt_flush("Illegal option -%c\n", c); 504 c = '?'; 505 goto out; 506 } 507 if (*++q == ':') 508 q++; 509 } 510 511 if (*++q == ':') { 512 if (*p == '\0' && (p = **optnext) == NULL) { 513 if (optstr[0] == ':') { 514 s[0] = c; 515 s[1] = '\0'; 516 newoptarg = s; 517 c = ':'; 518 } 519 else { 520 out2fmt_flush("No arg for -%c option\n", c); 521 c = '?'; 522 } 523 goto out; 524 } 525 526 if (p == **optnext) 527 (*optnext)++; 528 newoptarg = p; 529 p = NULL; 530 } 531 532 out: 533 if (*optnext != NULL) 534 ind = *optnext - optfirst + 1; 535 *optptr = p; 536 if (newoptarg != NULL) 537 err |= setvarsafe("OPTARG", newoptarg, 0); 538 else { 539 INTOFF; 540 err |= unsetvar("OPTARG"); 541 INTON; 542 } 543 fmtstr(s, sizeof(s), "%d", ind); 544 err |= setvarsafe("OPTIND", s, VNOFUNC); 545 s[0] = c; 546 s[1] = '\0'; 547 err |= setvarsafe(optvar, s, 0); 548 if (err) { 549 *optnext = NULL; 550 *optptr = NULL; 551 flushall(); 552 exraise(EXERROR); 553 } 554 return done; 555 } 556 557 /* 558 * Standard option processing (a la getopt) for builtin routines. The 559 * only argument that is passed to nextopt is the option string; the 560 * other arguments are unnecessary. It returns the option, or '\0' on 561 * end of input. 562 */ 563 564 int 565 nextopt(const char *optstring) 566 { 567 char *p; 568 const char *q; 569 char c; 570 571 if ((p = nextopt_optptr) == NULL || *p == '\0') { 572 p = *argptr; 573 if (p == NULL || *p != '-' || *++p == '\0') 574 return '\0'; 575 argptr++; 576 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 577 return '\0'; 578 } 579 c = *p++; 580 for (q = optstring ; *q != c ; ) { 581 if (*q == '\0') 582 error("Illegal option -%c", c); 583 if (*++q == ':') 584 q++; 585 } 586 if (*++q == ':') { 587 if (*p == '\0' && (p = *argptr++) == NULL) 588 error("No arg for -%c option", c); 589 shoptarg = p; 590 p = NULL; 591 } 592 nextopt_optptr = p; 593 return c; 594 } 595