1 /* $NetBSD: options.c,v 1.50 2017/07/24 12:35:37 kre Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)options.c 8.2 (Berkeley) 5/4/95"; 39 #else 40 __RCSID("$NetBSD: options.c,v 1.50 2017/07/24 12:35:37 kre Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 #include <signal.h> 45 #include <unistd.h> 46 #include <stdlib.h> 47 48 #include "shell.h" 49 #define DEFINE_OPTIONS 50 #include "options.h" 51 #undef DEFINE_OPTIONS 52 #include "builtins.h" 53 #include "nodes.h" /* for other header files */ 54 #include "eval.h" 55 #include "jobs.h" 56 #include "input.h" 57 #include "output.h" 58 #include "trap.h" 59 #include "var.h" 60 #include "memalloc.h" 61 #include "error.h" 62 #include "mystring.h" 63 #ifndef SMALL 64 #include "myhistedit.h" 65 #endif 66 #include "show.h" 67 68 char *arg0; /* value of $0 */ 69 struct shparam shellparam; /* current positional parameters */ 70 char **argptr; /* argument list for builtin commands */ 71 char *optionarg; /* set by nextopt (like getopt) */ 72 char *optptr; /* used by nextopt */ 73 74 char *minusc; /* argument to -c option */ 75 76 77 STATIC void options(int); 78 STATIC void minus_o(char *, int); 79 STATIC void setoption(int, int); 80 STATIC int getopts(char *, char *, char **, char ***, char **); 81 82 83 /* 84 * Process the shell command line arguments. 85 */ 86 87 void 88 procargs(int argc, char **argv) 89 { 90 size_t i; 91 int psx; 92 93 argptr = argv; 94 if (argc > 0) 95 argptr++; 96 97 psx = posix; /* save what we set it to earlier */ 98 /* 99 * option values are mostly boolean 0:off 1:on 100 * we use 2 (just in this routine) to mean "unknown yet" 101 */ 102 for (i = 0; i < NOPTS; i++) 103 optlist[i].val = 2; 104 posix = psx; /* restore before processing -o ... */ 105 106 options(1); 107 108 if (*argptr == NULL && minusc == NULL) 109 sflag = 1; 110 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(2)) 111 iflag = 1; 112 if (iflag == 1 && sflag == 2) 113 iflag = 2; 114 if (mflag == 2) 115 mflag = iflag; 116 #ifndef DO_SHAREDVFORK 117 if (usefork == 2) 118 usefork = 1; 119 #endif 120 #if DEBUG >= 2 121 if (debug == 2) 122 debug = 1; 123 #endif 124 /* 125 * Any options not dealt with as special cases just above, 126 * and which were not set on the command line, are set to 127 * their expected default values (mostly "off") 128 * 129 * then as each option is initialised, save its setting now 130 * as its "default" value for future use ("set -o default"). 131 */ 132 for (i = 0; i < NOPTS; i++) { 133 if (optlist[i].val == 2) 134 optlist[i].val = optlist[i].dflt; 135 optlist[i].dflt = optlist[i].val; 136 } 137 138 arg0 = argv[0]; 139 if (sflag == 0 && minusc == NULL) { 140 commandname = argv[0]; 141 arg0 = *argptr++; 142 setinputfile(arg0, 0); 143 commandname = arg0; 144 } 145 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */ 146 if (minusc != NULL) { 147 if (argptr == NULL || *argptr == NULL) 148 error("Bad -c option"); 149 minusc = *argptr++; 150 if (*argptr != 0) 151 arg0 = *argptr++; 152 } 153 154 shellparam.p = argptr; 155 shellparam.reset = 1; 156 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ 157 while (*argptr) { 158 shellparam.nparam++; 159 argptr++; 160 } 161 optschanged(); 162 } 163 164 165 void 166 optschanged(void) 167 { 168 setinteractive(iflag); 169 #ifndef SMALL 170 histedit(); 171 #endif 172 setjobctl(mflag); 173 } 174 175 /* 176 * Process shell options. The global variable argptr contains a pointer 177 * to the argument list; we advance it past the options. 178 */ 179 180 STATIC void 181 options(int cmdline) 182 { 183 static char empty[] = ""; 184 char *p; 185 int val; 186 int c; 187 188 if (cmdline) 189 minusc = NULL; 190 while ((p = *argptr) != NULL) { 191 argptr++; 192 if ((c = *p++) == '-') { 193 val = 1; 194 if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) { 195 if (!cmdline) { 196 /* "-" means turn off -x and -v */ 197 if (p[0] == '\0') 198 xflag = vflag = 0; 199 /* "--" means reset params */ 200 else if (*argptr == NULL) 201 setparam(argptr); 202 } 203 break; /* "-" or "--" terminates options */ 204 } 205 } else if (c == '+') { 206 val = 0; 207 } else { 208 argptr--; 209 break; 210 } 211 while ((c = *p++) != '\0') { 212 if (val == 1 && c == 'c' && cmdline) { 213 /* command is after shell args*/ 214 minusc = empty; 215 } else if (c == 'o') { 216 if (*p != '\0') 217 minus_o(p, val + (cmdline ? val : 0)); 218 else if (*argptr) 219 minus_o(*argptr++, 220 val + (cmdline ? val : 0)); 221 else if (!cmdline) 222 minus_o(NULL, val); 223 else 224 error("arg for %co missing", "+-"[val]); 225 break; 226 #ifdef DEBUG 227 } else if (c == 'D') { 228 if (*p) { 229 set_debug(p, val); 230 break; 231 } else if (*argptr) 232 set_debug(*argptr++, val); 233 else 234 set_debug("*$", val); 235 #endif 236 } else { 237 setoption(c, val); 238 } 239 } 240 } 241 } 242 243 static void 244 set_opt_val(size_t i, int val) 245 { 246 size_t j; 247 int flag; 248 249 if (val && (flag = optlist[i].opt_set)) { 250 /* some options (eg vi/emacs) are mutually exclusive */ 251 for (j = 0; j < NOPTS; j++) 252 if (optlist[j].opt_set == flag) 253 optlist[j].val = 0; 254 } 255 optlist[i].val = val; 256 #ifdef DEBUG 257 if (&optlist[i].val == &debug) 258 opentrace(); 259 #endif 260 } 261 262 STATIC void 263 minus_o(char *name, int val) 264 { 265 size_t i; 266 const char *sep = ": "; 267 268 if (name == NULL) { 269 if (val) { 270 out1str("Current option settings"); 271 for (i = 0; i < NOPTS; i++) { 272 if (optlist[i].name == NULL) { 273 out1fmt("%s%c%c", sep, 274 "+-"[optlist[i].val], 275 optlist[i].letter); 276 sep = ", "; 277 } 278 } 279 out1c('\n'); 280 for (i = 0; i < NOPTS; i++) { 281 if (optlist[i].name) 282 out1fmt("%-19s %s\n", optlist[i].name, 283 optlist[i].val ? "on" : "off"); 284 } 285 } else { 286 out1str("set -o default"); 287 for (i = 0; i < NOPTS; i++) { 288 if (optlist[i].val == optlist[i].dflt) 289 continue; 290 if (optlist[i].name) 291 out1fmt(" %co %s", 292 "+-"[optlist[i].val], optlist[i].name); 293 else 294 out1fmt(" %c%c", "+-"[optlist[i].val], 295 optlist[i].letter); 296 } 297 out1c('\n'); 298 } 299 } else { 300 if (val == 1 && equal(name, "default")) { /* special case */ 301 for (i = 0; i < NOPTS; i++) 302 set_opt_val(i, optlist[i].dflt); 303 return; 304 } 305 if (val) 306 val = 1; 307 for (i = 0; i < NOPTS; i++) 308 if (optlist[i].name && equal(name, optlist[i].name)) { 309 set_opt_val(i, val); 310 return; 311 } 312 error("Illegal option %co %s", "+-"[val], name); 313 } 314 } 315 316 317 STATIC void 318 setoption(int flag, int val) 319 { 320 size_t i; 321 322 for (i = 0; i < NOPTS; i++) 323 if (optlist[i].letter == flag) { 324 set_opt_val( i, val ); 325 return; 326 } 327 error("Illegal option %c%c", "+-"[val], flag); 328 /* NOTREACHED */ 329 } 330 331 332 333 #ifdef mkinit 334 INCLUDE "options.h" 335 336 SHELLPROC { 337 int i; 338 339 for (i = 0; optlist[i].name; i++) 340 optlist[i].val = 0; 341 optschanged(); 342 343 } 344 #endif 345 346 347 /* 348 * Set the shell parameters. 349 */ 350 351 void 352 setparam(char **argv) 353 { 354 char **newparam; 355 char **ap; 356 int nparam; 357 358 for (nparam = 0 ; argv[nparam] ; nparam++) 359 continue; 360 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap); 361 while (*argv) { 362 *ap++ = savestr(*argv++); 363 } 364 *ap = NULL; 365 freeparam(&shellparam); 366 shellparam.malloc = 1; 367 shellparam.nparam = nparam; 368 shellparam.p = newparam; 369 shellparam.optnext = NULL; 370 } 371 372 373 /* 374 * Free the list of positional parameters. 375 */ 376 377 void 378 freeparam(volatile struct shparam *param) 379 { 380 char **ap; 381 382 if (param->malloc) { 383 for (ap = param->p ; *ap ; ap++) 384 ckfree(*ap); 385 ckfree(param->p); 386 } 387 } 388 389 390 391 /* 392 * The shift builtin command. 393 */ 394 395 int 396 shiftcmd(int argc, char **argv) 397 { 398 int n; 399 char **ap1, **ap2; 400 401 if (argc > 2) 402 error("Usage: shift [n]"); 403 n = 1; 404 if (argc > 1) 405 n = number(argv[1]); 406 if (n > shellparam.nparam) 407 error("can't shift that many"); 408 INTOFF; 409 shellparam.nparam -= n; 410 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) { 411 if (shellparam.malloc) 412 ckfree(*ap1); 413 } 414 ap2 = shellparam.p; 415 while ((*ap2++ = *ap1++) != NULL) 416 continue; 417 shellparam.optnext = NULL; 418 INTON; 419 return 0; 420 } 421 422 423 424 /* 425 * The set command builtin. 426 */ 427 428 int 429 setcmd(int argc, char **argv) 430 { 431 if (argc == 1) 432 return showvars(0, 0, 1, 0); 433 INTOFF; 434 options(0); 435 optschanged(); 436 if (*argptr != NULL) { 437 setparam(argptr); 438 } 439 INTON; 440 return 0; 441 } 442 443 444 void 445 getoptsreset(const char *value) 446 { 447 if (number(value) == 1) { 448 shellparam.optnext = NULL; 449 shellparam.reset = 1; 450 } 451 } 452 453 /* 454 * The getopts builtin. Shellparam.optnext points to the next argument 455 * to be processed. Shellparam.optptr points to the next character to 456 * be processed in the current argument. If shellparam.optnext is NULL, 457 * then it's the first time getopts has been called. 458 */ 459 460 int 461 getoptscmd(int argc, char **argv) 462 { 463 char **optbase; 464 465 if (argc < 3) 466 error("usage: getopts optstring var [arg]"); 467 else if (argc == 3) 468 optbase = shellparam.p; 469 else 470 optbase = &argv[3]; 471 472 if (shellparam.reset == 1) { 473 shellparam.optnext = optbase; 474 shellparam.optptr = NULL; 475 shellparam.reset = 0; 476 } 477 478 return getopts(argv[1], argv[2], optbase, &shellparam.optnext, 479 &shellparam.optptr); 480 } 481 482 STATIC int 483 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, char **optpptr) 484 { 485 char *p, *q; 486 char c = '?'; 487 int done = 0; 488 int ind = 0; 489 int err = 0; 490 char s[12]; 491 492 if ((p = *optpptr) == NULL || *p == '\0') { 493 /* Current word is done, advance */ 494 if (*optnext == NULL) 495 return 1; 496 p = **optnext; 497 if (p == NULL || *p != '-' || *++p == '\0') { 498 atend: 499 ind = *optnext - optfirst + 1; 500 *optnext = NULL; 501 p = NULL; 502 done = 1; 503 goto out; 504 } 505 (*optnext)++; 506 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 507 goto atend; 508 } 509 510 c = *p++; 511 for (q = optstr; *q != c; ) { 512 if (*q == '\0') { 513 if (optstr[0] == ':') { 514 s[0] = c; 515 s[1] = '\0'; 516 err |= setvarsafe("OPTARG", s, 0); 517 } else { 518 outfmt(&errout, "Illegal option -%c\n", c); 519 (void) unsetvar("OPTARG", 0); 520 } 521 c = '?'; 522 goto bad; 523 } 524 if (*++q == ':') 525 q++; 526 } 527 528 if (*++q == ':') { 529 if (*p == '\0' && (p = **optnext) == NULL) { 530 if (optstr[0] == ':') { 531 s[0] = c; 532 s[1] = '\0'; 533 err |= setvarsafe("OPTARG", s, 0); 534 c = ':'; 535 } else { 536 outfmt(&errout, "No arg for -%c option\n", c); 537 (void) unsetvar("OPTARG", 0); 538 c = '?'; 539 } 540 goto bad; 541 } 542 543 if (p == **optnext) 544 (*optnext)++; 545 err |= setvarsafe("OPTARG", p, 0); 546 p = NULL; 547 } else 548 err |= setvarsafe("OPTARG", "", 0); 549 ind = *optnext - optfirst + 1; 550 goto out; 551 552 bad: 553 ind = 1; 554 *optnext = NULL; 555 p = NULL; 556 out: 557 *optpptr = p; 558 fmtstr(s, sizeof(s), "%d", ind); 559 err |= setvarsafe("OPTIND", s, VNOFUNC); 560 s[0] = c; 561 s[1] = '\0'; 562 err |= setvarsafe(optvar, s, 0); 563 if (err) { 564 *optnext = NULL; 565 *optpptr = NULL; 566 flushall(); 567 exraise(EXERROR); 568 } 569 return done; 570 } 571 572 /* 573 * XXX - should get rid of. have all builtins use getopt(3). the 574 * library getopt must have the BSD extension static variable "optreset" 575 * otherwise it can't be used within the shell safely. 576 * 577 * Standard option processing (a la getopt) for builtin routines. The 578 * only argument that is passed to nextopt is the option string; the 579 * other arguments are unnecessary. It return the character, or '\0' on 580 * end of input. 581 */ 582 583 int 584 nextopt(const char *optstring) 585 { 586 char *p; 587 const char *q; 588 char c; 589 590 if ((p = optptr) == NULL || *p == '\0') { 591 p = *argptr; 592 if (p == NULL || *p != '-' || *++p == '\0') 593 return '\0'; 594 argptr++; 595 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 596 return '\0'; 597 } 598 c = *p++; 599 for (q = optstring ; *q != c ; ) { 600 if (*q == '\0') 601 error("Illegal option -%c", c); 602 if (*++q == ':') 603 q++; 604 } 605 if (*++q == ':') { 606 if (*p == '\0' && (p = *argptr++) == NULL) 607 error("No arg for -%c option", c); 608 optionarg = p; 609 p = NULL; 610 } 611 optptr = p; 612 return c; 613 } 614