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 #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(iflag); 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 */ 145 146 static void 147 options(int cmdline) 148 { 149 char *kp, *p; 150 int val; 151 int c; 152 153 if (cmdline) 154 minusc = NULL; 155 while ((p = *argptr) != NULL) { 156 argptr++; 157 if ((c = *p++) == '-') { 158 val = 1; 159 /* A "-" or "--" terminates options */ 160 if (p[0] == '\0') 161 goto end_options1; 162 if (p[0] == '-' && p[1] == '\0') 163 goto end_options2; 164 /** 165 * For the benefit of `#!' lines in shell scripts, 166 * treat a string of '-- *#.*' the same as '--'. 167 * This is needed so that a script starting with: 168 * #!/bin/sh -- # -*- perl -*- 169 * will continue to work after a change is made to 170 * kern/imgact_shell.c to NOT token-ize the options 171 * specified on a '#!' line. A bit of a kludge, 172 * but that trick is recommended in documentation 173 * for some scripting languages, and we might as 174 * well continue to support it. 175 */ 176 if (p[0] == '-') { 177 kp = p + 1; 178 while (*kp == ' ' || *kp == '\t') 179 kp++; 180 if (*kp == '#' || *kp == '\0') 181 goto end_options2; 182 } 183 } else if (c == '+') { 184 val = 0; 185 } else { 186 argptr--; 187 break; 188 } 189 while ((c = *p++) != '\0') { 190 if (c == 'c' && cmdline) { 191 char *q; 192 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */ 193 if (*p == '\0') 194 #endif 195 q = *argptr++; 196 if (q == NULL || minusc != NULL) 197 error("Bad -c option"); 198 minusc = q; 199 #ifdef NOHACK 200 break; 201 #endif 202 } else if (c == 'o') { 203 minus_o(*argptr, val); 204 if (*argptr) 205 argptr++; 206 } else 207 setoption(c, val); 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(0, 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 const unsigned char *on; 255 size_t len; 256 257 if (name == NULL) { 258 if (val) { 259 /* "Pretty" output. */ 260 out1str("Current option settings\n"); 261 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1) 262 out1fmt("%-16.*s%s\n", *on, on + 1, 263 optval[i] ? "on" : "off"); 264 } else { 265 /* Output suitable for re-input to shell. */ 266 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1) 267 out1fmt("%s %co %.*s%s", 268 i % 6 == 0 ? "set" : "", 269 optval[i] ? '-' : '+', 270 *on, on + 1, 271 i % 6 == 5 || i == NOPTS - 1 ? "\n" : ""); 272 } 273 } else { 274 len = strlen(name); 275 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1) 276 if (*on == len && memcmp(on + 1, name, len) == 0) { 277 setoptionbyindex(i, val); 278 return; 279 } 280 error("Illegal option -o %s", name); 281 } 282 } 283 284 285 static void 286 setoptionbyindex(int idx, int val) 287 { 288 if (&optval[idx] == &privileged && !val && privileged) { 289 if (setgid(getgid()) == -1) 290 error("setgid"); 291 if (setuid(getuid()) == -1) 292 error("setuid"); 293 } 294 optval[idx] = val; 295 if (val) { 296 /* #%$ hack for ksh semantics */ 297 if (&optval[idx] == &Vflag) 298 Eflag = 0; 299 else if (&optval[idx] == &Eflag) 300 Vflag = 0; 301 } 302 } 303 304 static void 305 setoption(int flag, int val) 306 { 307 int i; 308 309 for (i = 0; i < NSHORTOPTS; i++) 310 if (optletter[i] == flag) { 311 setoptionbyindex(i, val); 312 return; 313 } 314 error("Illegal option -%c", flag); 315 } 316 317 318 /* 319 * Set the shell parameters. 320 */ 321 322 static void 323 setparam(int argc, char **argv) 324 { 325 char **newparam; 326 char **ap; 327 328 ap = newparam = ckmalloc((argc + 1) * sizeof *ap); 329 while (*argv) { 330 *ap++ = savestr(*argv++); 331 } 332 *ap = NULL; 333 freeparam(&shellparam); 334 shellparam.malloc = 1; 335 shellparam.nparam = argc; 336 shellparam.p = newparam; 337 shellparam.optp = NULL; 338 shellparam.reset = 1; 339 shellparam.optnext = NULL; 340 } 341 342 343 /* 344 * Free the list of positional parameters. 345 */ 346 347 void 348 freeparam(struct shparam *param) 349 { 350 char **ap; 351 352 if (param->malloc) { 353 for (ap = param->p ; *ap ; ap++) 354 ckfree(*ap); 355 ckfree(param->p); 356 } 357 if (param->optp) { 358 for (ap = param->optp ; *ap ; ap++) 359 ckfree(*ap); 360 ckfree(param->optp); 361 } 362 } 363 364 365 366 /* 367 * The shift builtin command. 368 */ 369 370 int 371 shiftcmd(int argc, char **argv) 372 { 373 int i, n; 374 375 n = 1; 376 if (argc > 1) 377 n = number(argv[1]); 378 if (n > shellparam.nparam) 379 return 1; 380 INTOFF; 381 shellparam.nparam -= n; 382 if (shellparam.malloc) 383 for (i = 0; i < n; i++) 384 ckfree(shellparam.p[i]); 385 memmove(shellparam.p, shellparam.p + n, 386 (shellparam.nparam + 1) * sizeof(shellparam.p[0])); 387 shellparam.reset = 1; 388 INTON; 389 return 0; 390 } 391 392 393 394 /* 395 * The set command builtin. 396 */ 397 398 int 399 setcmd(int argc, char **argv) 400 { 401 if (argc == 1) 402 return showvarscmd(argc, argv); 403 INTOFF; 404 options(0); 405 optschanged(); 406 if (*argptr != NULL) { 407 setparam(argc - (argptr - argv), argptr); 408 } 409 INTON; 410 return 0; 411 } 412 413 414 void 415 getoptsreset(const char *value) 416 { 417 while (*value == '0') 418 value++; 419 if (strcmp(value, "1") == 0) 420 shellparam.reset = 1; 421 } 422 423 /* 424 * The getopts builtin. Shellparam.optnext points to the next argument 425 * to be processed. Shellparam.optptr points to the next character to 426 * be processed in the current argument. If shellparam.optnext is NULL, 427 * then it's the first time getopts has been called. 428 */ 429 430 int 431 getoptscmd(int argc, char **argv) 432 { 433 char **optbase = NULL, **ap; 434 int i; 435 436 if (argc < 3) 437 error("usage: getopts optstring var [arg]"); 438 439 if (shellparam.reset == 1) { 440 INTOFF; 441 if (shellparam.optp) { 442 for (ap = shellparam.optp ; *ap ; ap++) 443 ckfree(*ap); 444 ckfree(shellparam.optp); 445 shellparam.optp = NULL; 446 } 447 if (argc > 3) { 448 shellparam.optp = ckmalloc((argc - 2) * sizeof *ap); 449 memset(shellparam.optp, '\0', (argc - 2) * sizeof *ap); 450 for (i = 0; i < argc - 3; i++) 451 shellparam.optp[i] = savestr(argv[i + 3]); 452 } 453 INTON; 454 optbase = argc == 3 ? shellparam.p : shellparam.optp; 455 shellparam.optnext = optbase; 456 shellparam.optptr = NULL; 457 shellparam.reset = 0; 458 } else 459 optbase = shellparam.optp ? shellparam.optp : shellparam.p; 460 461 return getopts(argv[1], argv[2], optbase, &shellparam.optnext, 462 &shellparam.optptr); 463 } 464 465 static int 466 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, 467 char **optptr) 468 { 469 char *p, *q; 470 char c = '?'; 471 int done = 0; 472 int ind = 0; 473 int err = 0; 474 char s[10]; 475 const char *newoptarg = NULL; 476 477 if ((p = *optptr) == NULL || *p == '\0') { 478 /* Current word is done, advance */ 479 if (*optnext == NULL) 480 return 1; 481 p = **optnext; 482 if (p == NULL || *p != '-' || *++p == '\0') { 483 atend: 484 ind = *optnext - optfirst + 1; 485 *optnext = NULL; 486 p = NULL; 487 done = 1; 488 goto out; 489 } 490 (*optnext)++; 491 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 492 goto atend; 493 } 494 495 c = *p++; 496 for (q = optstr; *q != c; ) { 497 if (*q == '\0') { 498 if (optstr[0] == ':') { 499 s[0] = c; 500 s[1] = '\0'; 501 newoptarg = s; 502 } 503 else 504 out2fmt_flush("Illegal option -%c\n", c); 505 c = '?'; 506 goto out; 507 } 508 if (*++q == ':') 509 q++; 510 } 511 512 if (*++q == ':') { 513 if (*p == '\0' && (p = **optnext) == NULL) { 514 if (optstr[0] == ':') { 515 s[0] = c; 516 s[1] = '\0'; 517 newoptarg = s; 518 c = ':'; 519 } 520 else { 521 out2fmt_flush("No arg for -%c option\n", c); 522 c = '?'; 523 } 524 goto out; 525 } 526 527 if (p == **optnext) 528 (*optnext)++; 529 newoptarg = p; 530 p = NULL; 531 } 532 533 out: 534 if (*optnext != NULL) 535 ind = *optnext - optfirst + 1; 536 *optptr = p; 537 if (newoptarg != NULL) 538 err |= setvarsafe("OPTARG", newoptarg, 0); 539 else { 540 INTOFF; 541 err |= unsetvar("OPTARG"); 542 INTON; 543 } 544 fmtstr(s, sizeof(s), "%d", ind); 545 err |= setvarsafe("OPTIND", s, VNOFUNC); 546 s[0] = c; 547 s[1] = '\0'; 548 err |= setvarsafe(optvar, s, 0); 549 if (err) { 550 *optnext = NULL; 551 *optptr = NULL; 552 flushall(); 553 exraise(EXERROR); 554 } 555 return done; 556 } 557 558 /* 559 * Standard option processing (a la getopt) for builtin routines. The 560 * only argument that is passed to nextopt is the option string; the 561 * other arguments are unnecessary. It return the character, or '\0' on 562 * end of input. 563 */ 564 565 int 566 nextopt(const char *optstring) 567 { 568 char *p; 569 const char *q; 570 char c; 571 572 if ((p = nextopt_optptr) == NULL || *p == '\0') { 573 p = *argptr; 574 if (p == NULL || *p != '-' || *++p == '\0') 575 return '\0'; 576 argptr++; 577 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 578 return '\0'; 579 } 580 c = *p++; 581 for (q = optstring ; *q != c ; ) { 582 if (*q == '\0') 583 error("Illegal option -%c", c); 584 if (*++q == ':') 585 q++; 586 } 587 if (*++q == ':') { 588 if (*p == '\0' && (p = *argptr++) == NULL) 589 error("No arg for -%c option", c); 590 shoptarg = p; 591 p = NULL; 592 } 593 nextopt_optptr = p; 594 return c; 595 } 596