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 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */ 195 if (*p == '\0') 196 #endif 197 q = *argptr++; 198 if (q == NULL || minusc != NULL) 199 error("Bad -c option"); 200 minusc = q; 201 #ifdef NOHACK 202 break; 203 #endif 204 } else if (c == 'o') { 205 minus_o(*argptr, val); 206 if (*argptr) 207 argptr++; 208 } else 209 setoption(c, val); 210 } 211 } 212 return; 213 214 /* When processing `set', a single "-" means turn off -x and -v */ 215 end_options1: 216 if (!cmdline) { 217 xflag = vflag = 0; 218 return; 219 } 220 221 /* 222 * When processing `set', a "--" means the remaining arguments 223 * replace the positional parameters in the active shell. If 224 * there are no remaining options, then all the positional 225 * parameters are cleared (equivalent to doing ``shift $#''). 226 */ 227 end_options2: 228 if (!cmdline) { 229 if (*argptr == NULL) 230 setparam(0, argptr); 231 return; 232 } 233 234 /* 235 * At this point we are processing options given to 'sh' on a command 236 * line. If an end-of-options marker ("-" or "--") is followed by an 237 * arg of "#", then skip over all remaining arguments. Some scripting 238 * languages (e.g.: perl) document that /bin/sh will implement this 239 * behavior, and they recommend that users take advantage of it to 240 * solve certain issues that can come up when writing a perl script. 241 * Yes, this feature is in /bin/sh to help users write perl scripts. 242 */ 243 p = *argptr; 244 if (p != NULL && p[0] == '#' && p[1] == '\0') { 245 while (*argptr != NULL) 246 argptr++; 247 /* We need to keep the final argument */ 248 argptr--; 249 } 250 } 251 252 static void 253 minus_o(char *name, int val) 254 { 255 int i; 256 const unsigned char *on; 257 size_t len; 258 259 if (name == NULL) { 260 if (val) { 261 /* "Pretty" output. */ 262 out1str("Current option settings\n"); 263 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1) 264 out1fmt("%-16.*s%s\n", *on, on + 1, 265 optval[i] ? "on" : "off"); 266 } else { 267 /* Output suitable for re-input to shell. */ 268 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1) 269 out1fmt("%s %co %.*s%s", 270 i % 6 == 0 ? "set" : "", 271 optval[i] ? '-' : '+', 272 *on, on + 1, 273 i % 6 == 5 || i == NOPTS - 1 ? "\n" : ""); 274 } 275 } else { 276 len = strlen(name); 277 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1) 278 if (*on == len && memcmp(on + 1, name, len) == 0) { 279 setoptionbyindex(i, val); 280 return; 281 } 282 error("Illegal option -o %s", name); 283 } 284 } 285 286 287 static void 288 setoptionbyindex(int idx, int val) 289 { 290 if (&optval[idx] == &privileged && !val && privileged) { 291 if (setgid(getgid()) == -1) 292 error("setgid"); 293 if (setuid(getuid()) == -1) 294 error("setuid"); 295 } 296 optval[idx] = val; 297 if (val) { 298 /* #%$ hack for ksh semantics */ 299 if (&optval[idx] == &Vflag) 300 Eflag = 0; 301 else if (&optval[idx] == &Eflag) 302 Vflag = 0; 303 } 304 } 305 306 static void 307 setoption(int flag, int val) 308 { 309 int i; 310 311 for (i = 0; i < NSHORTOPTS; i++) 312 if (optletter[i] == flag) { 313 setoptionbyindex(i, val); 314 return; 315 } 316 error("Illegal option -%c", flag); 317 } 318 319 320 /* 321 * Set the shell parameters. 322 */ 323 324 static void 325 setparam(int argc, char **argv) 326 { 327 char **newparam; 328 char **ap; 329 330 ap = newparam = ckmalloc((argc + 1) * sizeof *ap); 331 while (*argv) { 332 *ap++ = savestr(*argv++); 333 } 334 *ap = NULL; 335 freeparam(&shellparam); 336 shellparam.malloc = 1; 337 shellparam.nparam = argc; 338 shellparam.p = newparam; 339 shellparam.optp = NULL; 340 shellparam.reset = 1; 341 shellparam.optnext = NULL; 342 } 343 344 345 /* 346 * Free the list of positional parameters. 347 */ 348 349 void 350 freeparam(struct shparam *param) 351 { 352 char **ap; 353 354 if (param->malloc) { 355 for (ap = param->p ; *ap ; ap++) 356 ckfree(*ap); 357 ckfree(param->p); 358 } 359 if (param->optp) { 360 for (ap = param->optp ; *ap ; ap++) 361 ckfree(*ap); 362 ckfree(param->optp); 363 } 364 } 365 366 367 368 /* 369 * The shift builtin command. 370 */ 371 372 int 373 shiftcmd(int argc, char **argv) 374 { 375 int i, n; 376 377 n = 1; 378 if (argc > 1) 379 n = number(argv[1]); 380 if (n > shellparam.nparam) 381 return 1; 382 INTOFF; 383 shellparam.nparam -= n; 384 if (shellparam.malloc) 385 for (i = 0; i < n; i++) 386 ckfree(shellparam.p[i]); 387 memmove(shellparam.p, shellparam.p + n, 388 (shellparam.nparam + 1) * sizeof(shellparam.p[0])); 389 shellparam.reset = 1; 390 INTON; 391 return 0; 392 } 393 394 395 396 /* 397 * The set builtin command. 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(argc - (argptr - argv), argptr); 410 } 411 INTON; 412 return 0; 413 } 414 415 416 void 417 getoptsreset(const char *value) 418 { 419 while (*value == '0') 420 value++; 421 if (strcmp(value, "1") == 0) 422 shellparam.reset = 1; 423 } 424 425 /* 426 * The getopts builtin. Shellparam.optnext points to the next argument 427 * to be processed. Shellparam.optptr points to the next character to 428 * be processed in the current argument. If shellparam.optnext is NULL, 429 * then it's the first time getopts has been called. 430 */ 431 432 int 433 getoptscmd(int argc, char **argv) 434 { 435 char **optbase = NULL, **ap; 436 int i; 437 438 if (argc < 3) 439 error("usage: getopts optstring var [arg]"); 440 441 if (shellparam.reset == 1) { 442 INTOFF; 443 if (shellparam.optp) { 444 for (ap = shellparam.optp ; *ap ; ap++) 445 ckfree(*ap); 446 ckfree(shellparam.optp); 447 shellparam.optp = NULL; 448 } 449 if (argc > 3) { 450 shellparam.optp = ckmalloc((argc - 2) * sizeof *ap); 451 memset(shellparam.optp, '\0', (argc - 2) * sizeof *ap); 452 for (i = 0; i < argc - 3; i++) 453 shellparam.optp[i] = savestr(argv[i + 3]); 454 } 455 INTON; 456 optbase = argc == 3 ? shellparam.p : shellparam.optp; 457 shellparam.optnext = optbase; 458 shellparam.optptr = NULL; 459 shellparam.reset = 0; 460 } else 461 optbase = shellparam.optp ? shellparam.optp : shellparam.p; 462 463 return getopts(argv[1], argv[2], optbase, &shellparam.optnext, 464 &shellparam.optptr); 465 } 466 467 static int 468 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, 469 char **optptr) 470 { 471 char *p, *q; 472 char c = '?'; 473 int done = 0; 474 int ind = 0; 475 int err = 0; 476 char s[10]; 477 const char *newoptarg = NULL; 478 479 if ((p = *optptr) == NULL || *p == '\0') { 480 /* Current word is done, advance */ 481 if (*optnext == NULL) 482 return 1; 483 p = **optnext; 484 if (p == NULL || *p != '-' || *++p == '\0') { 485 atend: 486 ind = *optnext - optfirst + 1; 487 *optnext = NULL; 488 p = NULL; 489 done = 1; 490 goto out; 491 } 492 (*optnext)++; 493 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 494 goto atend; 495 } 496 497 c = *p++; 498 for (q = optstr; *q != c; ) { 499 if (*q == '\0') { 500 if (optstr[0] == ':') { 501 s[0] = c; 502 s[1] = '\0'; 503 newoptarg = s; 504 } 505 else 506 out2fmt_flush("Illegal option -%c\n", c); 507 c = '?'; 508 goto out; 509 } 510 if (*++q == ':') 511 q++; 512 } 513 514 if (*++q == ':') { 515 if (*p == '\0' && (p = **optnext) == NULL) { 516 if (optstr[0] == ':') { 517 s[0] = c; 518 s[1] = '\0'; 519 newoptarg = s; 520 c = ':'; 521 } 522 else { 523 out2fmt_flush("No arg for -%c option\n", c); 524 c = '?'; 525 } 526 goto out; 527 } 528 529 if (p == **optnext) 530 (*optnext)++; 531 newoptarg = p; 532 p = NULL; 533 } 534 535 out: 536 if (*optnext != NULL) 537 ind = *optnext - optfirst + 1; 538 *optptr = p; 539 if (newoptarg != NULL) 540 err |= setvarsafe("OPTARG", newoptarg, 0); 541 else { 542 INTOFF; 543 err |= unsetvar("OPTARG"); 544 INTON; 545 } 546 fmtstr(s, sizeof(s), "%d", ind); 547 err |= setvarsafe("OPTIND", s, VNOFUNC); 548 s[0] = c; 549 s[1] = '\0'; 550 err |= setvarsafe(optvar, s, 0); 551 if (err) { 552 *optnext = NULL; 553 *optptr = NULL; 554 flushall(); 555 exraise(EXERROR); 556 } 557 return done; 558 } 559 560 /* 561 * Standard option processing (a la getopt) for builtin routines. The 562 * only argument that is passed to nextopt is the option string; the 563 * other arguments are unnecessary. It returns the option, or '\0' on 564 * end of input. 565 */ 566 567 int 568 nextopt(const char *optstring) 569 { 570 char *p; 571 const char *q; 572 char c; 573 574 if ((p = nextopt_optptr) == NULL || *p == '\0') { 575 p = *argptr; 576 if (p == NULL || *p != '-' || *++p == '\0') 577 return '\0'; 578 argptr++; 579 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 580 return '\0'; 581 } 582 c = *p++; 583 for (q = optstring ; *q != c ; ) { 584 if (*q == '\0') 585 error("Illegal option -%c", c); 586 if (*++q == ':') 587 q++; 588 } 589 if (*++q == ':') { 590 if (*p == '\0' && (p = *argptr++) == NULL) 591 error("No arg for -%c option", c); 592 shoptarg = p; 593 p = NULL; 594 } 595 nextopt_optptr = p; 596 return c; 597 } 598