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 1.33 2011/02/04 22:47:55 jilles Exp $ 38 */ 39 40 #include <signal.h> 41 #include <unistd.h> 42 #include <stdlib.h> 43 44 #include "shell.h" 45 #define DEFINE_OPTIONS 46 #include "options.h" 47 #undef DEFINE_OPTIONS 48 #include "nodes.h" /* for other header files */ 49 #include "eval.h" 50 #include "jobs.h" 51 #include "input.h" 52 #include "output.h" 53 #include "trap.h" 54 #include "var.h" 55 #include "memalloc.h" 56 #include "error.h" 57 #include "mystring.h" 58 #ifndef NO_HISTORY 59 #include "myhistedit.h" 60 #endif 61 62 char *arg0; /* value of $0 */ 63 struct shparam shellparam; /* current positional parameters */ 64 char **argptr; /* argument list for builtin commands */ 65 const char *shoptarg; /* set by nextopt (like getopt) */ 66 char *nextopt_optptr; /* used by nextopt */ 67 68 char *minusc; /* argument to -c option */ 69 70 71 static void options(int); 72 static void minus_o(char *, int); 73 static void setoption(int, int); 74 static int getopts(char *, char *, char **, char ***, char **); 75 76 77 /* 78 * Process the shell command line arguments. 79 */ 80 81 void 82 procargs(int argc, char **argv) 83 { 84 int i; 85 86 argptr = argv; 87 if (argc > 0) 88 argptr++; 89 for (i = 0; i < NOPTS; i++) 90 optlist[i].val = 2; 91 privileged = (getuid() != geteuid() || getgid() != getegid()); 92 options(1); 93 if (*argptr == NULL && minusc == NULL) 94 sflag = 1; 95 if (iflag != 0 && sflag == 1 && isatty(0) && isatty(1)) { 96 iflag = 1; 97 if (Eflag == 2) 98 Eflag = 1; 99 } 100 if (mflag == 2) 101 mflag = iflag; 102 /* turn on tabcomplete in an interactive shell by default */ 103 tabcomplete = iflag; 104 for (i = 0; i < NOPTS; i++) 105 if (optlist[i].val == 2) 106 optlist[i].val = 0; 107 arg0 = argv[0]; 108 if (sflag == 0 && minusc == NULL) { 109 commandname = arg0 = *argptr++; 110 setinputfile(commandname, 0); 111 } 112 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */ 113 if (argptr && minusc && *argptr) 114 arg0 = *argptr++; 115 116 shellparam.p = argptr; 117 shellparam.reset = 1; 118 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ 119 while (*argptr) { 120 shellparam.nparam++; 121 argptr++; 122 } 123 optschanged(); 124 } 125 126 127 void 128 optschanged(void) 129 { 130 setinteractive(iflag); 131 #ifndef NO_HISTORY 132 histedit(); 133 #endif 134 setjobctl(mflag); 135 } 136 137 /* 138 * Process shell options. The global variable argptr contains a pointer 139 * to the argument list; we advance it past the options. 140 */ 141 142 static void 143 options(int cmdline) 144 { 145 char *kp, *p; 146 int val; 147 int c; 148 149 if (cmdline) 150 minusc = NULL; 151 while ((p = *argptr) != NULL) { 152 argptr++; 153 if ((c = *p++) == '-') { 154 val = 1; 155 /* A "-" or "--" terminates options */ 156 if (p[0] == '\0') 157 goto end_options1; 158 if (p[0] == '-' && p[1] == '\0') 159 goto end_options2; 160 /** 161 * For the benefit of `#!' lines in shell scripts, 162 * treat a string of '-- *#.*' the same as '--'. 163 * This is needed so that a script starting with: 164 * #!/bin/sh -- # -*- perl -*- 165 * will continue to work after a change is made to 166 * kern/imgact_shell.c to NOT token-ize the options 167 * specified on a '#!' line. A bit of a kludge, 168 * but that trick is recommended in documentation 169 * for some scripting languages, and we might as 170 * well continue to support it. 171 */ 172 if (p[0] == '-') { 173 kp = p + 1; 174 while (*kp == ' ' || *kp == '\t') 175 kp++; 176 if (*kp == '#' || *kp == '\0') 177 goto end_options2; 178 } 179 } else if (c == '+') { 180 val = 0; 181 } else { 182 argptr--; 183 break; 184 } 185 while ((c = *p++) != '\0') { 186 if (c == 'c' && cmdline) { 187 char *q; 188 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */ 189 if (*p == '\0') 190 #endif 191 q = *argptr++; 192 if (q == NULL || minusc != NULL) 193 error("Bad -c option"); 194 minusc = q; 195 #ifdef NOHACK 196 break; 197 #endif 198 } else if (c == 'o') { 199 minus_o(*argptr, val); 200 if (*argptr) 201 argptr++; 202 } else { 203 if (c == 'p' && !val && privileged) { 204 setuid(getuid()); 205 setgid(getgid()); 206 } 207 setoption(c, val); 208 } 209 } 210 } 211 return; 212 213 /* When processing `set', a single "-" means turn off -x and -v */ 214 end_options1: 215 if (!cmdline) { 216 xflag = vflag = 0; 217 return; 218 } 219 220 /* 221 * When processing `set', a "--" means the remaining arguments 222 * replace the positional parameters in the active shell. If 223 * there are no remaining options, then all the positional 224 * parameters are cleared (equivalent to doing ``shift $#''). 225 */ 226 end_options2: 227 if (!cmdline) { 228 if (*argptr == NULL) 229 setparam(argptr); 230 return; 231 } 232 233 /* 234 * At this point we are processing options given to 'sh' on a command 235 * line. If an end-of-options marker ("-" or "--") is followed by an 236 * arg of "#", then skip over all remaining arguments. Some scripting 237 * languages (e.g.: perl) document that /bin/sh will implement this 238 * behavior, and they recommend that users take advantage of it to 239 * solve certain issues that can come up when writing a perl script. 240 * Yes, this feature is in /bin/sh to help users write perl scripts. 241 */ 242 p = *argptr; 243 if (p != NULL && p[0] == '#' && p[1] == '\0') { 244 while (*argptr != NULL) 245 argptr++; 246 /* We need to keep the final argument */ 247 argptr--; 248 } 249 } 250 251 static void 252 minus_o(char *name, int val) 253 { 254 int i; 255 256 if (name == NULL) { 257 if (val) { 258 /* "Pretty" output. */ 259 out1str("Current option settings\n"); 260 for (i = 0; i < NOPTS; i++) 261 out1fmt("%-16s%s\n", optlist[i].name, 262 optlist[i].val ? "on" : "off"); 263 } else { 264 /* Output suitable for re-input to shell. */ 265 for (i = 0; i < NOPTS; i++) 266 out1fmt("%s %co %s%s", 267 i % 6 == 0 ? "set" : "", 268 optlist[i].val ? '-' : '+', 269 optlist[i].name, 270 i % 6 == 5 || i == NOPTS - 1 ? "\n" : ""); 271 } 272 } else { 273 for (i = 0; i < NOPTS; i++) 274 if (equal(name, optlist[i].name)) { 275 if (!val && privileged && equal(name, "privileged")) { 276 setuid(getuid()); 277 setgid(getgid()); 278 } 279 setoption(optlist[i].letter, val); 280 return; 281 } 282 error("Illegal option -o %s", name); 283 } 284 } 285 286 287 static void 288 setoption(int flag, int val) 289 { 290 int i; 291 292 for (i = 0; i < NOPTS; i++) 293 if (optlist[i].letter == flag) { 294 optlist[i].val = val; 295 if (val) { 296 /* #%$ hack for ksh semantics */ 297 if (flag == 'V') 298 Eflag = 0; 299 else if (flag == 'E') 300 Vflag = 0; 301 } 302 return; 303 } 304 error("Illegal option -%c", flag); 305 } 306 307 308 /* 309 * Set the shell parameters. 310 */ 311 312 void 313 setparam(char **argv) 314 { 315 char **newparam; 316 char **ap; 317 int nparam; 318 319 for (nparam = 0 ; argv[nparam] ; nparam++); 320 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap); 321 while (*argv) { 322 *ap++ = savestr(*argv++); 323 } 324 *ap = NULL; 325 freeparam(&shellparam); 326 shellparam.malloc = 1; 327 shellparam.nparam = nparam; 328 shellparam.p = newparam; 329 shellparam.reset = 1; 330 shellparam.optnext = NULL; 331 } 332 333 334 /* 335 * Free the list of positional parameters. 336 */ 337 338 void 339 freeparam(volatile struct shparam *param) 340 { 341 char **ap; 342 343 if (param->malloc) { 344 for (ap = param->p ; *ap ; ap++) 345 ckfree(*ap); 346 ckfree(param->p); 347 } 348 } 349 350 351 352 /* 353 * The shift builtin command. 354 */ 355 356 int 357 shiftcmd(int argc, char **argv) 358 { 359 int n; 360 char **ap1, **ap2; 361 362 n = 1; 363 if (argc > 1) 364 n = number(argv[1]); 365 if (n > shellparam.nparam) 366 return 1; 367 INTOFF; 368 shellparam.nparam -= n; 369 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) { 370 if (shellparam.malloc) 371 ckfree(*ap1); 372 } 373 ap2 = shellparam.p; 374 while ((*ap2++ = *ap1++) != NULL); 375 shellparam.reset = 1; 376 INTON; 377 return 0; 378 } 379 380 381 382 /* 383 * The set command builtin. 384 */ 385 386 int 387 setcmd(int argc, char **argv) 388 { 389 if (argc == 1) 390 return showvarscmd(argc, argv); 391 INTOFF; 392 options(0); 393 optschanged(); 394 if (*argptr != NULL) { 395 setparam(argptr); 396 } 397 INTON; 398 return 0; 399 } 400 401 402 void 403 getoptsreset(const char *value) 404 { 405 if (number(value) == 1) { 406 shellparam.reset = 1; 407 } 408 } 409 410 /* 411 * The getopts builtin. Shellparam.optnext points to the next argument 412 * to be processed. Shellparam.optptr points to the next character to 413 * be processed in the current argument. If shellparam.optnext is NULL, 414 * then it's the first time getopts has been called. 415 */ 416 417 int 418 getoptscmd(int argc, char **argv) 419 { 420 char **optbase = NULL; 421 422 if (argc < 3) 423 error("usage: getopts optstring var [arg]"); 424 else if (argc == 3) 425 optbase = shellparam.p; 426 else 427 optbase = &argv[3]; 428 429 if (shellparam.reset == 1) { 430 shellparam.optnext = optbase; 431 shellparam.optptr = NULL; 432 shellparam.reset = 0; 433 } 434 435 return getopts(argv[1], argv[2], optbase, &shellparam.optnext, 436 &shellparam.optptr); 437 } 438 439 static int 440 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, 441 char **optp) 442 { 443 char *p, *q; 444 char c = '?'; 445 int done = 0; 446 int ind = 0; 447 int err = 0; 448 char s[10]; 449 450 if ((p = *optp) == NULL || *p == '\0') { 451 /* Current word is done, advance */ 452 if (*optnext == NULL) 453 return 1; 454 p = **optnext; 455 if (p == NULL || *p != '-' || *++p == '\0') { 456 atend: 457 ind = *optnext - optfirst + 1; 458 *optnext = NULL; 459 p = NULL; 460 done = 1; 461 goto out; 462 } 463 (*optnext)++; 464 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 465 goto atend; 466 } 467 468 c = *p++; 469 for (q = optstr; *q != c; ) { 470 if (*q == '\0') { 471 if (optstr[0] == ':') { 472 s[0] = c; 473 s[1] = '\0'; 474 err |= setvarsafe("OPTARG", s, 0); 475 } 476 else { 477 out1fmt("Illegal option -%c\n", c); 478 unsetvar("OPTARG"); 479 } 480 c = '?'; 481 goto bad; 482 } 483 if (*++q == ':') 484 q++; 485 } 486 487 if (*++q == ':') { 488 if (*p == '\0' && (p = **optnext) == NULL) { 489 if (optstr[0] == ':') { 490 s[0] = c; 491 s[1] = '\0'; 492 err |= setvarsafe("OPTARG", s, 0); 493 c = ':'; 494 } 495 else { 496 out1fmt("No arg for -%c option\n", c); 497 unsetvar("OPTARG"); 498 c = '?'; 499 } 500 goto bad; 501 } 502 503 if (p == **optnext) 504 (*optnext)++; 505 setvarsafe("OPTARG", p, 0); 506 p = NULL; 507 } 508 else 509 setvarsafe("OPTARG", "", 0); 510 ind = *optnext - optfirst + 1; 511 goto out; 512 513 bad: 514 ind = 1; 515 *optnext = NULL; 516 p = NULL; 517 out: 518 *optp = p; 519 fmtstr(s, sizeof(s), "%d", ind); 520 err |= setvarsafe("OPTIND", s, VNOFUNC); 521 s[0] = c; 522 s[1] = '\0'; 523 err |= setvarsafe(optvar, s, 0); 524 if (err) { 525 *optnext = NULL; 526 *optp = NULL; 527 flushall(); 528 exraise(EXERROR); 529 } 530 return done; 531 } 532 533 /* 534 * XXX - should get rid of. have all builtins use getopt(3). the 535 * library getopt must have the BSD extension static variable "optreset" 536 * otherwise it can't be used within the shell safely. 537 * 538 * Standard option processing (a la getopt) for builtin routines. The 539 * only argument that is passed to nextopt is the option string; the 540 * other arguments are unnecessary. It return the character, or '\0' on 541 * end of input. 542 */ 543 544 int 545 nextopt(const char *optstring) 546 { 547 char *p; 548 const char *q; 549 char c; 550 551 if ((p = nextopt_optptr) == NULL || *p == '\0') { 552 p = *argptr; 553 if (p == NULL || *p != '-' || *++p == '\0') 554 return '\0'; 555 argptr++; 556 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 557 return '\0'; 558 } 559 c = *p++; 560 for (q = optstring ; *q != c ; ) { 561 if (*q == '\0') 562 error("Illegal option -%c", c); 563 if (*++q == ':') 564 q++; 565 } 566 if (*++q == ':') { 567 if (*p == '\0' && (p = *argptr++) == NULL) 568 error("No arg for -%c option", c); 569 shoptarg = p; 570 p = NULL; 571 } 572 nextopt_optptr = p; 573 return c; 574 } 575