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 int getopts(char *, char *, char **, char ***, char **); 78 79 80 /* 81 * Process the shell command line arguments. 82 */ 83 84 void 85 procargs(int argc, char **argv) 86 { 87 int i; 88 char *scriptname; 89 90 argptr = argv; 91 if (argc > 0) 92 argptr++; 93 for (i = 0; i < NOPTS; i++) 94 optval[i] = 2; 95 privileged = (getuid() != geteuid() || getgid() != getegid()); 96 options(1); 97 if (*argptr == NULL && minusc == NULL) 98 sflag = 1; 99 if (iflag != 0 && sflag == 1 && isatty(0) && isatty(1)) { 100 iflag = 1; 101 if (Eflag == 2) 102 Eflag = 1; 103 } 104 if (mflag == 2) 105 mflag = iflag; 106 for (i = 0; i < NOPTS; i++) 107 if (optval[i] == 2) 108 optval[i] = 0; 109 arg0 = argv[0]; 110 if (sflag == 0 && minusc == NULL) { 111 scriptname = *argptr++; 112 setinputfile(scriptname, 0); 113 commandname = arg0 = scriptname; 114 } 115 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */ 116 if (argptr && minusc && *argptr) 117 arg0 = *argptr++; 118 119 shellparam.p = argptr; 120 shellparam.reset = 1; 121 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ 122 while (*argptr) { 123 shellparam.nparam++; 124 argptr++; 125 } 126 optschanged(); 127 } 128 129 130 void 131 optschanged(void) 132 { 133 setinteractive(iflag); 134 #ifndef NO_HISTORY 135 histedit(); 136 #endif 137 setjobctl(mflag); 138 } 139 140 /* 141 * Process shell options. The global variable argptr contains a pointer 142 * to the argument list; we advance it past the options. 143 */ 144 145 static void 146 options(int cmdline) 147 { 148 char *kp, *p; 149 int val; 150 int c; 151 152 if (cmdline) 153 minusc = NULL; 154 while ((p = *argptr) != NULL) { 155 argptr++; 156 if ((c = *p++) == '-') { 157 val = 1; 158 /* A "-" or "--" terminates options */ 159 if (p[0] == '\0') 160 goto end_options1; 161 if (p[0] == '-' && p[1] == '\0') 162 goto end_options2; 163 /** 164 * For the benefit of `#!' lines in shell scripts, 165 * treat a string of '-- *#.*' the same as '--'. 166 * This is needed so that a script starting with: 167 * #!/bin/sh -- # -*- perl -*- 168 * will continue to work after a change is made to 169 * kern/imgact_shell.c to NOT token-ize the options 170 * specified on a '#!' line. A bit of a kludge, 171 * but that trick is recommended in documentation 172 * for some scripting languages, and we might as 173 * well continue to support it. 174 */ 175 if (p[0] == '-') { 176 kp = p + 1; 177 while (*kp == ' ' || *kp == '\t') 178 kp++; 179 if (*kp == '#' || *kp == '\0') 180 goto end_options2; 181 } 182 } else if (c == '+') { 183 val = 0; 184 } else { 185 argptr--; 186 break; 187 } 188 while ((c = *p++) != '\0') { 189 if (c == 'c' && cmdline) { 190 char *q; 191 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */ 192 if (*p == '\0') 193 #endif 194 q = *argptr++; 195 if (q == NULL || minusc != NULL) 196 error("Bad -c option"); 197 minusc = q; 198 #ifdef NOHACK 199 break; 200 #endif 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 $#''). 223 */ 224 end_options2: 225 if (!cmdline) { 226 if (*argptr == NULL) 227 setparam(argptr); 228 return; 229 } 230 231 /* 232 * At this point we are processing options given to 'sh' on a command 233 * line. If an end-of-options marker ("-" or "--") is followed by an 234 * arg of "#", then skip over all remaining arguments. Some scripting 235 * languages (e.g.: perl) document that /bin/sh will implement this 236 * behavior, and they recommend that users take advantage of it to 237 * solve certain issues that can come up when writing a perl script. 238 * Yes, this feature is in /bin/sh to help users write perl scripts. 239 */ 240 p = *argptr; 241 if (p != NULL && p[0] == '#' && p[1] == '\0') { 242 while (*argptr != NULL) 243 argptr++; 244 /* We need to keep the final argument */ 245 argptr--; 246 } 247 } 248 249 static void 250 minus_o(char *name, int val) 251 { 252 int i; 253 const unsigned char *on; 254 size_t len; 255 256 if (name == NULL) { 257 if (val) { 258 /* "Pretty" output. */ 259 out1str("Current option settings\n"); 260 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1) 261 out1fmt("%-16.*s%s\n", *on, on + 1, 262 optval[i] ? "on" : "off"); 263 } else { 264 /* Output suitable for re-input to shell. */ 265 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1) 266 out1fmt("%s %co %.*s%s", 267 i % 6 == 0 ? "set" : "", 268 optval[i] ? '-' : '+', 269 *on, on + 1, 270 i % 6 == 5 || i == NOPTS - 1 ? "\n" : ""); 271 } 272 } else { 273 len = strlen(name); 274 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1) 275 if (*on == len && memcmp(on + 1, name, len) == 0) { 276 setoptionbyindex(i, val); 277 return; 278 } 279 error("Illegal option -o %s", name); 280 } 281 } 282 283 284 static void 285 setoptionbyindex(int idx, int val) 286 { 287 if (optletter[idx] == 'p' && !val && privileged) { 288 if (setgid(getgid()) == -1) 289 error("setgid"); 290 if (setuid(getuid()) == -1) 291 error("setuid"); 292 } 293 optval[idx] = val; 294 if (val) { 295 /* #%$ hack for ksh semantics */ 296 if (optletter[idx] == 'V') 297 Eflag = 0; 298 else if (optletter[idx] == 'E') 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 void 322 setparam(char **argv) 323 { 324 char **newparam; 325 char **ap; 326 int nparam; 327 328 for (nparam = 0 ; argv[nparam] ; nparam++); 329 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap); 330 while (*argv) { 331 *ap++ = savestr(*argv++); 332 } 333 *ap = NULL; 334 freeparam(&shellparam); 335 shellparam.malloc = 1; 336 shellparam.nparam = nparam; 337 shellparam.p = newparam; 338 shellparam.optp = NULL; 339 shellparam.reset = 1; 340 shellparam.optnext = NULL; 341 } 342 343 344 /* 345 * Free the list of positional parameters. 346 */ 347 348 void 349 freeparam(struct shparam *param) 350 { 351 char **ap; 352 353 if (param->malloc) { 354 for (ap = param->p ; *ap ; ap++) 355 ckfree(*ap); 356 ckfree(param->p); 357 } 358 if (param->optp) { 359 for (ap = param->optp ; *ap ; ap++) 360 ckfree(*ap); 361 ckfree(param->optp); 362 } 363 } 364 365 366 367 /* 368 * The shift builtin command. 369 */ 370 371 int 372 shiftcmd(int argc, char **argv) 373 { 374 int n; 375 char **ap1, **ap2; 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 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) { 385 if (shellparam.malloc) 386 ckfree(*ap1); 387 } 388 ap2 = shellparam.p; 389 while ((*ap2++ = *ap1++) != NULL); 390 shellparam.reset = 1; 391 INTON; 392 return 0; 393 } 394 395 396 397 /* 398 * The set command builtin. 399 */ 400 401 int 402 setcmd(int argc, char **argv) 403 { 404 if (argc == 1) 405 return showvarscmd(argc, argv); 406 INTOFF; 407 options(0); 408 optschanged(); 409 if (*argptr != NULL) { 410 setparam(argptr); 411 } 412 INTON; 413 return 0; 414 } 415 416 417 void 418 getoptsreset(const char *value) 419 { 420 while (*value == '0') 421 value++; 422 if (strcmp(value, "1") == 0) 423 shellparam.reset = 1; 424 } 425 426 /* 427 * The getopts builtin. Shellparam.optnext points to the next argument 428 * to be processed. Shellparam.optptr points to the next character to 429 * be processed in the current argument. If shellparam.optnext is NULL, 430 * then it's the first time getopts has been called. 431 */ 432 433 int 434 getoptscmd(int argc, char **argv) 435 { 436 char **optbase = NULL, **ap; 437 int i; 438 439 if (argc < 3) 440 error("usage: getopts optstring var [arg]"); 441 442 if (shellparam.reset == 1) { 443 INTOFF; 444 if (shellparam.optp) { 445 for (ap = shellparam.optp ; *ap ; ap++) 446 ckfree(*ap); 447 ckfree(shellparam.optp); 448 shellparam.optp = NULL; 449 } 450 if (argc > 3) { 451 shellparam.optp = ckmalloc((argc - 2) * sizeof *ap); 452 memset(shellparam.optp, '\0', (argc - 2) * sizeof *ap); 453 for (i = 0; i < argc - 3; i++) 454 shellparam.optp[i] = savestr(argv[i + 3]); 455 } 456 INTON; 457 optbase = argc == 3 ? shellparam.p : shellparam.optp; 458 shellparam.optnext = optbase; 459 shellparam.optptr = NULL; 460 shellparam.reset = 0; 461 } else 462 optbase = shellparam.optp ? shellparam.optp : shellparam.p; 463 464 return getopts(argv[1], argv[2], optbase, &shellparam.optnext, 465 &shellparam.optptr); 466 } 467 468 static int 469 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, 470 char **optptr) 471 { 472 char *p, *q; 473 char c = '?'; 474 int done = 0; 475 int ind = 0; 476 int err = 0; 477 char s[10]; 478 const char *newoptarg = NULL; 479 480 if ((p = *optptr) == NULL || *p == '\0') { 481 /* Current word is done, advance */ 482 if (*optnext == NULL) 483 return 1; 484 p = **optnext; 485 if (p == NULL || *p != '-' || *++p == '\0') { 486 atend: 487 ind = *optnext - optfirst + 1; 488 *optnext = NULL; 489 p = NULL; 490 done = 1; 491 goto out; 492 } 493 (*optnext)++; 494 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 495 goto atend; 496 } 497 498 c = *p++; 499 for (q = optstr; *q != c; ) { 500 if (*q == '\0') { 501 if (optstr[0] == ':') { 502 s[0] = c; 503 s[1] = '\0'; 504 newoptarg = s; 505 } 506 else 507 out2fmt_flush("Illegal option -%c\n", c); 508 c = '?'; 509 goto out; 510 } 511 if (*++q == ':') 512 q++; 513 } 514 515 if (*++q == ':') { 516 if (*p == '\0' && (p = **optnext) == NULL) { 517 if (optstr[0] == ':') { 518 s[0] = c; 519 s[1] = '\0'; 520 newoptarg = s; 521 c = ':'; 522 } 523 else { 524 out2fmt_flush("No arg for -%c option\n", c); 525 c = '?'; 526 } 527 goto out; 528 } 529 530 if (p == **optnext) 531 (*optnext)++; 532 newoptarg = p; 533 p = NULL; 534 } 535 536 out: 537 if (*optnext != NULL) 538 ind = *optnext - optfirst + 1; 539 *optptr = p; 540 if (newoptarg != NULL) 541 err |= setvarsafe("OPTARG", newoptarg, 0); 542 else { 543 INTOFF; 544 err |= unsetvar("OPTARG"); 545 INTON; 546 } 547 fmtstr(s, sizeof(s), "%d", ind); 548 err |= setvarsafe("OPTIND", s, VNOFUNC); 549 s[0] = c; 550 s[1] = '\0'; 551 err |= setvarsafe(optvar, s, 0); 552 if (err) { 553 *optnext = NULL; 554 *optptr = NULL; 555 flushall(); 556 exraise(EXERROR); 557 } 558 return done; 559 } 560 561 /* 562 * Standard option processing (a la getopt) for builtin routines. The 563 * only argument that is passed to nextopt is the option string; the 564 * other arguments are unnecessary. It return the character, or '\0' on 565 * end of input. 566 */ 567 568 int 569 nextopt(const char *optstring) 570 { 571 char *p; 572 const char *q; 573 char c; 574 575 if ((p = nextopt_optptr) == NULL || *p == '\0') { 576 p = *argptr; 577 if (p == NULL || *p != '-' || *++p == '\0') 578 return '\0'; 579 argptr++; 580 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 581 return '\0'; 582 } 583 c = *p++; 584 for (q = optstring ; *q != c ; ) { 585 if (*q == '\0') 586 error("Illegal option -%c", c); 587 if (*++q == ':') 588 q++; 589 } 590 if (*++q == ':') { 591 if (*p == '\0' && (p = *argptr++) == NULL) 592 error("No arg for -%c option", c); 593 shoptarg = p; 594 p = NULL; 595 } 596 nextopt_optptr = p; 597 return c; 598 } 599