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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)options.c 8.2 (Berkeley) 5/4/95 37 * $FreeBSD: src/bin/sh/options.c,v 1.25 2006/04/09 12:20:42 stefanf Exp $ 38 * $DragonFly: src/bin/sh/options.c,v 1.7 2007/01/14 04:41:32 pavalos Exp $ 39 */ 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 #ifndef NO_HISTORY 60 #include "myhistedit.h" 61 #endif 62 63 char *arg0; /* value of $0 */ 64 struct shparam shellparam; /* current positional parameters */ 65 char **argptr; /* argument list for builtin commands */ 66 const char *shoptarg; /* set by nextopt (like getopt) */ 67 const char *optptr; /* used by nextopt */ 68 69 char *minusc; /* argument to -c option */ 70 71 72 STATIC void options(int); 73 STATIC void minus_o(char *, int); 74 STATIC void setoption(int, int); 75 STATIC int getopts(char *, char *, char **, char ***, char **); 76 77 78 /* 79 * Process the shell command line arguments. 80 */ 81 82 void 83 procargs(int argc, char **argv) 84 { 85 int i; 86 87 argptr = argv; 88 if (argc > 0) 89 argptr++; 90 for (i = 0; i < NOPTS; i++) 91 optlist[i].val = 2; 92 privileged = (getuid() != geteuid() || getgid() != getegid()); 93 options(1); 94 if (*argptr == NULL && minusc == NULL) 95 sflag = 1; 96 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1)) 97 iflag = 1; 98 if (mflag == 2) 99 mflag = iflag; 100 for (i = 0; i < NOPTS; i++) 101 if (optlist[i].val == 2) 102 optlist[i].val = 0; 103 arg0 = argv[0]; 104 if (sflag == 0 && minusc == NULL) { 105 commandname = arg0 = *argptr++; 106 setinputfile(commandname, 0); 107 } 108 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */ 109 if (argptr && minusc && *argptr) 110 arg0 = *argptr++; 111 112 shellparam.p = argptr; 113 shellparam.reset = 1; 114 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ 115 while (*argptr) { 116 shellparam.nparam++; 117 argptr++; 118 } 119 optschanged(); 120 } 121 122 123 void 124 optschanged(void) 125 { 126 setinteractive(iflag); 127 #ifndef NO_HISTORY 128 histedit(); 129 #endif 130 setjobctl(mflag); 131 } 132 133 /* 134 * Process shell options. The global variable argptr contains a pointer 135 * to the argument list; we advance it past the options. 136 */ 137 138 STATIC void 139 options(int cmdline) 140 { 141 char *kp, *p; 142 int val; 143 int c; 144 145 if (cmdline) 146 minusc = NULL; 147 while ((p = *argptr) != NULL) { 148 argptr++; 149 if ((c = *p++) == '-') { 150 val = 1; 151 /* A "-" or "--" terminates options */ 152 if (p[0] == '\0') 153 goto end_options1; 154 if (p[0] == '-' && p[1] == '\0') 155 goto end_options2; 156 /** 157 * For the benefit of `#!' lines in shell scripts, 158 * treat a string of '-- *#.*' the same as '--'. 159 * This is needed so that a script starting with: 160 * #!/bin/sh -- # -*- perl -*- 161 * will continue to work after a change is made to 162 * kern/imgact_shell.c to NOT token-ize the options 163 * specified on a '#!' line. A bit of a kludge, 164 * but that trick is recommended in documentation 165 * for some scripting languages, and we might as 166 * well continue to support it. 167 */ 168 if (p[0] == '-') { 169 kp = p + 1; 170 while (*kp == ' ' || *kp == '\t') 171 kp++; 172 if (*kp == '#' || *kp == '\0') 173 goto end_options2; 174 } 175 } else if (c == '+') { 176 val = 0; 177 } else { 178 argptr--; 179 break; 180 } 181 while ((c = *p++) != '\0') { 182 if (c == 'c' && cmdline) { 183 char *q; 184 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */ 185 if (*p == '\0') 186 #endif 187 q = *argptr++; 188 if (q == NULL || minusc != NULL) 189 error("Bad -c option"); 190 minusc = q; 191 #ifdef NOHACK 192 break; 193 #endif 194 } else if (c == 'o') { 195 minus_o(*argptr, val); 196 if (*argptr) 197 argptr++; 198 } else { 199 if (c == 'p' && !val && privileged) { 200 setuid(getuid()); 201 setgid(getgid()); 202 } 203 setoption(c, val); 204 } 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 $#''). 221 */ 222 end_options2: 223 if (!cmdline) { 224 if (*argptr == NULL) 225 setparam(argptr); 226 return; 227 } 228 229 /* 230 * At this point we are processing options given to 'sh' on a command 231 * line. If an end-of-options marker ("-" or "--") is followed by an 232 * arg of "#", then skip over all remaining arguments. Some scripting 233 * languages (e.g.: perl) document that /bin/sh will implement this 234 * behavior, and they recommend that users take advantage of it to 235 * solve certain issues that can come up when writing a perl script. 236 * Yes, this feature is in /bin/sh to help users write perl scripts. 237 */ 238 p = *argptr; 239 if (p != NULL && p[0] == '#' && p[1] == '\0') { 240 while (*argptr != NULL) 241 argptr++; 242 /* We need to keep the final argument */ 243 argptr--; 244 } 245 } 246 247 STATIC void 248 minus_o(char *name, int val) 249 { 250 int i; 251 252 if (name == NULL) { 253 if (val) { 254 /* "Pretty" output. */ 255 out1str("Current option settings\n"); 256 for (i = 0; i < NOPTS; i++) 257 out1fmt("%-16s%s\n", optlist[i].name, 258 optlist[i].val ? "on" : "off"); 259 } else { 260 /* Output suitable for re-input to shell. */ 261 for (i = 0; i < NOPTS; i++) { 262 if (i % 6 == 0) 263 out1str(i == 0 ? "set" : "\nset"); 264 out1fmt(" %co %s", optlist[i].val ? '-' : '+', 265 optlist[i].name); 266 } 267 out1c('\n'); 268 } 269 } else { 270 for (i = 0; i < NOPTS; i++) 271 if (equal(name, optlist[i].name)) { 272 if (!val && privileged && equal(name, "privileged")) { 273 setuid(getuid()); 274 setgid(getgid()); 275 } 276 setoption(optlist[i].letter, val); 277 return; 278 } 279 error("Illegal option -o %s", name); 280 } 281 } 282 283 284 STATIC void 285 setoption(int flag, int val) 286 { 287 int i; 288 289 for (i = 0; i < NOPTS; i++) 290 if (optlist[i].letter == flag) { 291 optlist[i].val = val; 292 if (val) { 293 /* #%$ hack for ksh semantics */ 294 if (flag == 'V') 295 Eflag = 0; 296 else if (flag == 'E') 297 Vflag = 0; 298 } 299 return; 300 } 301 error("Illegal option -%c", flag); 302 } 303 304 305 306 #ifdef mkinit 307 INCLUDE "options.h" 308 309 SHELLPROC { 310 int i; 311 312 for (i = 0; i < NOPTS; i++) 313 optlist[i].val = 0; 314 optschanged(); 315 316 } 317 #endif 318 319 320 /* 321 * Set the shell parameters. 322 */ 323 324 void 325 setparam(char **argv) 326 { 327 char **newparam; 328 char **ap; 329 int nparam; 330 331 for (nparam = 0 ; argv[nparam] ; nparam++); 332 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap); 333 while (*argv) { 334 *ap++ = savestr(*argv++); 335 } 336 *ap = NULL; 337 freeparam(&shellparam); 338 shellparam.malloc = 1; 339 shellparam.nparam = nparam; 340 shellparam.p = newparam; 341 shellparam.optnext = NULL; 342 } 343 344 345 /* 346 * Free the list of positional parameters. 347 */ 348 349 void 350 freeparam(volatile 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 } 360 361 362 363 /* 364 * The shift builtin command. 365 */ 366 367 int 368 shiftcmd(int argc, char **argv) 369 { 370 int n; 371 char **ap1, **ap2; 372 373 n = 1; 374 if (argc > 1) 375 n = number(argv[1]); 376 if (n > shellparam.nparam) 377 return 1; 378 INTOFF; 379 shellparam.nparam -= n; 380 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) { 381 if (shellparam.malloc) 382 ckfree(*ap1); 383 } 384 ap2 = shellparam.p; 385 while ((*ap2++ = *ap1++) != NULL); 386 shellparam.optnext = NULL; 387 INTON; 388 return 0; 389 } 390 391 392 393 /* 394 * The set command builtin. 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(argptr); 407 } 408 INTON; 409 return 0; 410 } 411 412 413 void 414 getoptsreset(const char *value) 415 { 416 if (number(value) == 1) { 417 shellparam.optnext = NULL; 418 shellparam.reset = 1; 419 } 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; 433 434 if (argc < 3) 435 error("usage: getopts optstring var [arg]"); 436 else if (argc == 3) 437 optbase = shellparam.p; 438 else 439 optbase = &argv[3]; 440 441 if (shellparam.reset == 1) { 442 shellparam.optnext = optbase; 443 shellparam.optptr = NULL; 444 shellparam.reset = 0; 445 } 446 447 return getopts(argv[1], argv[2], optbase, &shellparam.optnext, 448 &shellparam.optptr); 449 } 450 451 STATIC int 452 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, 453 char **optp) 454 { 455 char *p, *q; 456 char c = '?'; 457 int done = 0; 458 int ind = 0; 459 int err = 0; 460 char s[10]; 461 462 if ((p = *optp) == NULL || *p == '\0') { 463 /* Current word is done, advance */ 464 if (*optnext == NULL) 465 return 1; 466 p = **optnext; 467 if (p == NULL || *p != '-' || *++p == '\0') { 468 atend: 469 ind = *optnext - optfirst + 1; 470 *optnext = NULL; 471 p = NULL; 472 done = 1; 473 goto out; 474 } 475 (*optnext)++; 476 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 477 goto atend; 478 } 479 480 c = *p++; 481 for (q = optstr; *q != c; ) { 482 if (*q == '\0') { 483 if (optstr[0] == ':') { 484 s[0] = c; 485 s[1] = '\0'; 486 err |= setvarsafe("OPTARG", s, 0); 487 } 488 else { 489 out1fmt("Illegal option -%c\n", c); 490 unsetvar("OPTARG"); 491 } 492 c = '?'; 493 goto bad; 494 } 495 if (*++q == ':') 496 q++; 497 } 498 499 if (*++q == ':') { 500 if (*p == '\0' && (p = **optnext) == NULL) { 501 if (optstr[0] == ':') { 502 s[0] = c; 503 s[1] = '\0'; 504 err |= setvarsafe("OPTARG", s, 0); 505 c = ':'; 506 } 507 else { 508 out1fmt("No arg for -%c option\n", c); 509 unsetvar("OPTARG"); 510 c = '?'; 511 } 512 goto bad; 513 } 514 515 if (p == **optnext) 516 (*optnext)++; 517 setvarsafe("OPTARG", p, 0); 518 p = NULL; 519 } 520 else 521 setvarsafe("OPTARG", "", 0); 522 ind = *optnext - optfirst + 1; 523 goto out; 524 525 bad: 526 ind = 1; 527 *optnext = NULL; 528 p = NULL; 529 out: 530 *optp = p; 531 fmtstr(s, sizeof(s), "%d", ind); 532 err |= setvarsafe("OPTIND", s, VNOFUNC); 533 s[0] = c; 534 s[1] = '\0'; 535 err |= setvarsafe(optvar, s, 0); 536 if (err) { 537 *optnext = NULL; 538 *optp = NULL; 539 flushall(); 540 exraise(EXERROR); 541 } 542 return done; 543 } 544 545 /* 546 * XXX - should get rid of. have all builtins use getopt(3). the 547 * library getopt must have the BSD extension static variable "optreset" 548 * otherwise it can't be used within the shell safely. 549 * 550 * Standard option processing (a la getopt) for builtin routines. The 551 * only argument that is passed to nextopt is the option string; the 552 * other arguments are unnecessary. It return the character, or '\0' on 553 * end of input. 554 */ 555 556 int 557 nextopt(const char *optstring) 558 { 559 const char *p, *q; 560 char c; 561 562 if ((p = optptr) == NULL || *p == '\0') { 563 p = *argptr; 564 if (p == NULL || *p != '-' || *++p == '\0') 565 return '\0'; 566 argptr++; 567 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 568 return '\0'; 569 } 570 c = *p++; 571 for (q = optstring ; *q != c ; ) { 572 if (*q == '\0') 573 error("Illegal option -%c", c); 574 if (*++q == ':') 575 q++; 576 } 577 if (*++q == ':') { 578 if (*p == '\0' && (p = *argptr++) == NULL) 579 error("No arg for -%c option", c); 580 shoptarg = p; 581 p = NULL; 582 } 583 optptr = p; 584 return c; 585 } 586