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 * @(#)options.c 8.2 (Berkeley) 5/4/95 33 * $FreeBSD: head/bin/sh/options.c 240247 2012-09-08 19:24:03Z jilles $ 34 */ 35 36 #include <signal.h> 37 #include <unistd.h> 38 #include <stdlib.h> 39 40 #include "shell.h" 41 #define DEFINE_OPTIONS 42 #include "options.h" 43 #undef DEFINE_OPTIONS 44 #include "nodes.h" /* for other header files */ 45 #include "eval.h" 46 #include "jobs.h" 47 #include "input.h" 48 #include "output.h" 49 #include "trap.h" 50 #include "var.h" 51 #include "memalloc.h" 52 #include "error.h" 53 #include "mystring.h" 54 #include "builtins.h" 55 #ifndef NO_HISTORY 56 #include "myhistedit.h" 57 #endif 58 59 char *arg0; /* value of $0 */ 60 struct shparam shellparam; /* current positional parameters */ 61 char **argptr; /* argument list for builtin commands */ 62 const char *shoptarg; /* set by nextopt (like getopt) */ 63 char *nextopt_optptr; /* used by nextopt */ 64 65 char *minusc; /* argument to -c option */ 66 67 68 static void options(int); 69 static void minus_o(char *, int); 70 static void setoption(int, int); 71 static int getopts(char *, char *, char **, char ***, char **); 72 73 74 /* 75 * Process the shell command line arguments. 76 */ 77 78 void 79 procargs(int argc, char **argv) 80 { 81 int i; 82 char *scriptname; 83 84 argptr = argv; 85 if (argc > 0) 86 argptr++; 87 for (i = 0; i < NOPTS; i++) 88 optlist[i].val = 2; 89 privileged = (getuid() != geteuid() || getgid() != getegid()); 90 options(1); 91 if (*argptr == NULL && minusc == NULL) 92 sflag = 1; 93 if (iflag != 0 && sflag == 1 && isatty(0) && isatty(1)) { 94 iflag = 1; 95 if (Eflag == 2) 96 Eflag = 1; 97 } 98 if (mflag == 2) 99 mflag = iflag; 100 /* turn on tabcomplete in an interactive shell by default */ 101 tabcomplete = iflag; 102 for (i = 0; i < NOPTS; i++) 103 if (optlist[i].val == 2) 104 optlist[i].val = 0; 105 arg0 = argv[0]; 106 if (sflag == 0 && minusc == NULL) { 107 scriptname = *argptr++; 108 setinputfile(scriptname, 0); 109 commandname = arg0 = scriptname; 110 } 111 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */ 112 if (argptr && minusc && *argptr) 113 arg0 = *argptr++; 114 115 shellparam.p = argptr; 116 shellparam.reset = 1; 117 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ 118 while (*argptr) { 119 shellparam.nparam++; 120 argptr++; 121 } 122 optschanged(); 123 } 124 125 126 void 127 optschanged(void) 128 { 129 setinteractive(iflag); 130 #ifndef NO_HISTORY 131 histedit(); 132 #endif 133 setjobctl(mflag); 134 } 135 136 /* 137 * Process shell options. The global variable argptr contains a pointer 138 * to the argument list; we advance it past the options. 139 */ 140 141 static void 142 options(int cmdline) 143 { 144 char *kp, *p; 145 int val; 146 int c; 147 148 if (cmdline) 149 minusc = NULL; 150 while ((p = *argptr) != NULL) { 151 argptr++; 152 if ((c = *p++) == '-') { 153 val = 1; 154 /* A "-" or "--" terminates options */ 155 if (p[0] == '\0') 156 goto end_options1; 157 if (p[0] == '-' && p[1] == '\0') 158 goto end_options2; 159 /** 160 * For the benefit of `#!' lines in shell scripts, 161 * treat a string of '-- *#.*' the same as '--'. 162 * This is needed so that a script starting with: 163 * #!/bin/sh -- # -*- perl -*- 164 * will continue to work after a change is made to 165 * kern/imgact_shell.c to NOT token-ize the options 166 * specified on a '#!' line. A bit of a kludge, 167 * but that trick is recommended in documentation 168 * for some scripting languages, and we might as 169 * well continue to support it. 170 */ 171 if (p[0] == '-') { 172 kp = p + 1; 173 while (*kp == ' ' || *kp == '\t') 174 kp++; 175 if (*kp == '#' || *kp == '\0') 176 goto end_options2; 177 } 178 } else if (c == '+') { 179 val = 0; 180 } else { 181 argptr--; 182 break; 183 } 184 while ((c = *p++) != '\0') { 185 if (c == 'c' && cmdline) { 186 char *q; 187 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */ 188 if (*p == '\0') 189 #endif 190 q = *argptr++; 191 if (q == NULL || minusc != NULL) 192 error("Bad -c option"); 193 minusc = q; 194 #ifdef NOHACK 195 break; 196 #endif 197 } else if (c == 'o') { 198 minus_o(*argptr, val); 199 if (*argptr) 200 argptr++; 201 } else 202 setoption(c, val); 203 } 204 } 205 return; 206 207 /* When processing `set', a single "-" means turn off -x and -v */ 208 end_options1: 209 if (!cmdline) { 210 xflag = vflag = 0; 211 return; 212 } 213 214 /* 215 * When processing `set', a "--" means the remaining arguments 216 * replace the positional parameters in the active shell. If 217 * there are no remaining options, then all the positional 218 * parameters are cleared (equivalent to doing ``shift $#''). 219 */ 220 end_options2: 221 if (!cmdline) { 222 if (*argptr == NULL) 223 setparam(argptr); 224 return; 225 } 226 227 /* 228 * At this point we are processing options given to 'sh' on a command 229 * line. If an end-of-options marker ("-" or "--") is followed by an 230 * arg of "#", then skip over all remaining arguments. Some scripting 231 * languages (e.g.: perl) document that /bin/sh will implement this 232 * behavior, and they recommend that users take advantage of it to 233 * solve certain issues that can come up when writing a perl script. 234 * Yes, this feature is in /bin/sh to help users write perl scripts. 235 */ 236 p = *argptr; 237 if (p != NULL && p[0] == '#' && p[1] == '\0') { 238 while (*argptr != NULL) 239 argptr++; 240 /* We need to keep the final argument */ 241 argptr--; 242 } 243 } 244 245 static void 246 minus_o(char *name, int val) 247 { 248 int i; 249 250 if (name == NULL) { 251 if (val) { 252 /* "Pretty" output. */ 253 out1str("Current option settings\n"); 254 for (i = 0; i < NOPTS; i++) 255 out1fmt("%-16s%s\n", optlist[i].name, 256 optlist[i].val ? "on" : "off"); 257 } else { 258 /* Output suitable for re-input to shell. */ 259 for (i = 0; i < NOPTS; i++) 260 out1fmt("%s %co %s%s", 261 i % 6 == 0 ? "set" : "", 262 optlist[i].val ? '-' : '+', 263 optlist[i].name, 264 i % 6 == 5 || i == NOPTS - 1 ? "\n" : ""); 265 } 266 } else { 267 for (i = 0; i < NOPTS; i++) 268 if (equal(name, optlist[i].name)) { 269 setoption(optlist[i].letter, val); 270 return; 271 } 272 error("Illegal option -o %s", name); 273 } 274 } 275 276 277 static void 278 setoption(int flag, int val) 279 { 280 int i; 281 282 if (flag == 'p' && !val && privileged) { 283 if (setgid(getgid()) == -1) 284 error("setgid"); 285 if (setuid(getuid()) == -1) 286 error("setuid"); 287 } 288 for (i = 0; i < NOPTS; i++) 289 if (optlist[i].letter == flag) { 290 optlist[i].val = val; 291 if (val) { 292 /* #%$ hack for ksh semantics */ 293 if (flag == 'V') 294 Eflag = 0; 295 else if (flag == 'E') 296 Vflag = 0; 297 } 298 return; 299 } 300 error("Illegal option -%c", flag); 301 } 302 303 304 /* 305 * Set the shell parameters. 306 */ 307 308 void 309 setparam(char **argv) 310 { 311 char **newparam; 312 char **ap; 313 int nparam; 314 315 for (nparam = 0 ; argv[nparam] ; nparam++); 316 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap); 317 while (*argv) { 318 *ap++ = savestr(*argv++); 319 } 320 *ap = NULL; 321 freeparam(&shellparam); 322 shellparam.malloc = 1; 323 shellparam.nparam = nparam; 324 shellparam.p = newparam; 325 shellparam.reset = 1; 326 shellparam.optnext = NULL; 327 } 328 329 330 /* 331 * Free the list of positional parameters. 332 */ 333 334 void 335 freeparam(volatile struct shparam *param) 336 { 337 char **ap; 338 339 if (param->malloc) { 340 for (ap = param->p ; *ap ; ap++) 341 ckfree(*ap); 342 ckfree(param->p); 343 } 344 } 345 346 347 348 /* 349 * The shift builtin command. 350 */ 351 352 int 353 shiftcmd(int argc, char **argv) 354 { 355 int n; 356 char **ap1, **ap2; 357 358 n = 1; 359 if (argc > 1) 360 n = number(argv[1]); 361 if (n > shellparam.nparam) 362 return 1; 363 INTOFF; 364 shellparam.nparam -= n; 365 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) { 366 if (shellparam.malloc) 367 ckfree(*ap1); 368 } 369 ap2 = shellparam.p; 370 while ((*ap2++ = *ap1++) != NULL); 371 shellparam.reset = 1; 372 INTON; 373 return 0; 374 } 375 376 377 378 /* 379 * The set command builtin. 380 */ 381 382 int 383 setcmd(int argc, char **argv) 384 { 385 if (argc == 1) 386 return showvarscmd(argc, argv); 387 INTOFF; 388 options(0); 389 optschanged(); 390 if (*argptr != NULL) { 391 setparam(argptr); 392 } 393 INTON; 394 return 0; 395 } 396 397 398 void 399 getoptsreset(const char *value) 400 { 401 while (*value == '0') 402 value++; 403 if (strcmp(value, "1") == 0) 404 shellparam.reset = 1; 405 } 406 407 /* 408 * The getopts builtin. Shellparam.optnext points to the next argument 409 * to be processed. Shellparam.optptr points to the next character to 410 * be processed in the current argument. If shellparam.optnext is NULL, 411 * then it's the first time getopts has been called. 412 */ 413 414 int 415 getoptscmd(int argc, char **argv) 416 { 417 char **optbase = NULL; 418 419 if (argc < 3) 420 error("usage: getopts optstring var [arg]"); 421 else if (argc == 3) 422 optbase = shellparam.p; 423 else 424 optbase = &argv[3]; 425 426 if (shellparam.reset == 1) { 427 shellparam.optnext = optbase; 428 shellparam.optptr = NULL; 429 shellparam.reset = 0; 430 } 431 432 return getopts(argv[1], argv[2], optbase, &shellparam.optnext, 433 &shellparam.optptr); 434 } 435 436 static int 437 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, 438 char **optp) 439 { 440 char *p, *q; 441 char c = '?'; 442 int done = 0; 443 int ind = 0; 444 int err = 0; 445 char s[10]; 446 447 if ((p = *optp) == NULL || *p == '\0') { 448 /* Current word is done, advance */ 449 if (*optnext == NULL) 450 return 1; 451 p = **optnext; 452 if (p == NULL || *p != '-' || *++p == '\0') { 453 atend: 454 ind = *optnext - optfirst + 1; 455 *optnext = NULL; 456 p = NULL; 457 done = 1; 458 goto out; 459 } 460 (*optnext)++; 461 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 462 goto atend; 463 } 464 465 c = *p++; 466 for (q = optstr; *q != c; ) { 467 if (*q == '\0') { 468 if (optstr[0] == ':') { 469 s[0] = c; 470 s[1] = '\0'; 471 err |= setvarsafe("OPTARG", s, 0); 472 } 473 else { 474 out1fmt("Illegal option -%c\n", c); 475 unsetvar("OPTARG"); 476 } 477 c = '?'; 478 goto bad; 479 } 480 if (*++q == ':') 481 q++; 482 } 483 484 if (*++q == ':') { 485 if (*p == '\0' && (p = **optnext) == NULL) { 486 if (optstr[0] == ':') { 487 s[0] = c; 488 s[1] = '\0'; 489 err |= setvarsafe("OPTARG", s, 0); 490 c = ':'; 491 } 492 else { 493 out1fmt("No arg for -%c option\n", c); 494 unsetvar("OPTARG"); 495 c = '?'; 496 } 497 goto bad; 498 } 499 500 if (p == **optnext) 501 (*optnext)++; 502 setvarsafe("OPTARG", p, 0); 503 p = NULL; 504 } 505 else 506 setvarsafe("OPTARG", "", 0); 507 ind = *optnext - optfirst + 1; 508 goto out; 509 510 bad: 511 ind = 1; 512 *optnext = NULL; 513 p = NULL; 514 out: 515 *optp = p; 516 fmtstr(s, sizeof(s), "%d", ind); 517 err |= setvarsafe("OPTIND", s, VNOFUNC); 518 s[0] = c; 519 s[1] = '\0'; 520 err |= setvarsafe(optvar, s, 0); 521 if (err) { 522 *optnext = NULL; 523 *optp = NULL; 524 flushall(); 525 exraise(EXERROR); 526 } 527 return done; 528 } 529 530 /* 531 * Standard option processing (a la getopt) for builtin routines. The 532 * only argument that is passed to nextopt is the option string; the 533 * other arguments are unnecessary. It return the character, or '\0' on 534 * end of input. 535 */ 536 537 int 538 nextopt(const char *optstring) 539 { 540 char *p; 541 const char *q; 542 char c; 543 544 if ((p = nextopt_optptr) == NULL || *p == '\0') { 545 p = *argptr; 546 if (p == NULL || *p != '-' || *++p == '\0') 547 return '\0'; 548 argptr++; 549 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 550 return '\0'; 551 } 552 c = *p++; 553 for (q = optstring ; *q != c ; ) { 554 if (*q == '\0') 555 error("Illegal option -%c", c); 556 if (*++q == ':') 557 q++; 558 } 559 if (*++q == ':') { 560 if (*p == '\0' && (p = *argptr++) == NULL) 561 error("No arg for -%c option", c); 562 shoptarg = p; 563 p = NULL; 564 } 565 nextopt_optptr = p; 566 return c; 567 } 568