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