1/* $OpenBSD: getopt_long.c,v 1.25 2011/03/05 22:10:11 guenther Exp $ */ 2/* $NetBSD: getopt_long.c,v 1.15 2002/01/31 22:43:40 tv Exp $ */ 3 4/* 5 * Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 * 19 * Sponsored in part by the Defense Advanced Research Projects 20 * Agency (DARPA) and Air Force Research Laboratory, Air Force 21 * Materiel Command, USAF, under agreement number F39502-99-1-0512. 22 */ 23/*- 24 * Copyright (c) 2000 The NetBSD Foundation, Inc. 25 * All rights reserved. 26 * 27 * This code is derived from software contributed to The NetBSD Foundation 28 * by Dieter Baron and Thomas Klausner. 29 * 30 * Redistribution and use in source and binary forms, with or without 31 * modification, are permitted provided that the following conditions 32 * are met: 33 * 1. Redistributions of source code must retain the above copyright 34 * notice, this list of conditions and the following disclaimer. 35 * 2. Redistributions in binary form must reproduce the above copyright 36 * notice, this list of conditions and the following disclaimer in the 37 * documentation and/or other materials provided with the distribution. 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 40 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 41 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 43 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 44 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 45 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 46 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 47 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 49 * POSSIBILITY OF SUCH DAMAGE. 50 */ 51 52/* OPENBSD ORIGINAL: lib/libc/stdlib/getopt_long.c */ 53#include "includes.h" 54 55#if !defined(HAVE_GETOPT) || !defined(HAVE_GETOPT_OPTRESET) 56 57/* 58 * Some defines to make it easier to keep the code in sync with upstream. 59 * getopt opterr optind optopt optreset optarg are all in defines.h which is 60 * pulled in by includes.h. 61 */ 62#define warnx logit 63 64#if 0 65#include <err.h> 66#include <getopt.h> 67#endif 68#include <errno.h> 69#include <stdlib.h> 70#include <string.h> 71#include <stdarg.h> 72 73#include "log.h" 74 75struct option { 76 /* name of long option */ 77 const char *name; 78 /* 79 * one of no_argument, required_argument, and optional_argument: 80 * whether option takes an argument 81 */ 82 int has_arg; 83 /* if not NULL, set *flag to val when option found */ 84 int *flag; 85 /* if flag not NULL, value to set *flag to; else return value */ 86 int val; 87}; 88 89int opterr = 1; /* if error message should be printed */ 90int optind = 1; /* index into parent argv vector */ 91int optopt = '?'; /* character checked for validity */ 92int optreset; /* reset getopt */ 93char *optarg; /* argument associated with option */ 94 95#define PRINT_ERROR ((opterr) && (*options != ':')) 96 97#define FLAG_PERMUTE 0x01 /* permute non-options to the end of argv */ 98#define FLAG_ALLARGS 0x02 /* treat non-options as args to option "-1" */ 99#define FLAG_LONGONLY 0x04 /* operate as getopt_long_only */ 100 101/* return values */ 102#define BADCH (int)'?' 103#define BADARG ((*options == ':') ? (int)':' : (int)'?') 104#define INORDER (int)1 105 106#define EMSG "" 107 108static int getopt_internal(int, char * const *, const char *, 109 const struct option *, int *, int); 110static int parse_long_options(char * const *, const char *, 111 const struct option *, int *, int); 112static int gcd(int, int); 113static void permute_args(int, int, int, char * const *); 114 115static char *place = EMSG; /* option letter processing */ 116 117/* XXX: set optreset to 1 rather than these two */ 118static int nonopt_start = -1; /* first non option argument (for permute) */ 119static int nonopt_end = -1; /* first option after non options (for permute) */ 120 121/* Error messages */ 122static const char recargchar[] = "option requires an argument -- %c"; 123static const char recargstring[] = "option requires an argument -- %s"; 124static const char ambig[] = "ambiguous option -- %.*s"; 125static const char noarg[] = "option doesn't take an argument -- %.*s"; 126static const char illoptchar[] = "unknown option -- %c"; 127static const char illoptstring[] = "unknown option -- %s"; 128 129/* 130 * Compute the greatest common divisor of a and b. 131 */ 132static int 133gcd(int a, int b) 134{ 135 int c; 136 137 c = a % b; 138 while (c != 0) { 139 a = b; 140 b = c; 141 c = a % b; 142 } 143 144 return (b); 145} 146 147/* 148 * Exchange the block from nonopt_start to nonopt_end with the block 149 * from nonopt_end to opt_end (keeping the same order of arguments 150 * in each block). 151 */ 152static void 153permute_args(int panonopt_start, int panonopt_end, int opt_end, 154 char * const *nargv) 155{ 156 int cstart, cyclelen, i, j, ncycle, nnonopts, nopts, pos; 157 char *swap; 158 159 /* 160 * compute lengths of blocks and number and size of cycles 161 */ 162 nnonopts = panonopt_end - panonopt_start; 163 nopts = opt_end - panonopt_end; 164 ncycle = gcd(nnonopts, nopts); 165 cyclelen = (opt_end - panonopt_start) / ncycle; 166 167 for (i = 0; i < ncycle; i++) { 168 cstart = panonopt_end+i; 169 pos = cstart; 170 for (j = 0; j < cyclelen; j++) { 171 if (pos >= panonopt_end) 172 pos -= nnonopts; 173 else 174 pos += nopts; 175 swap = nargv[pos]; 176 /* LINTED const cast */ 177 ((char **) nargv)[pos] = nargv[cstart]; 178 /* LINTED const cast */ 179 ((char **)nargv)[cstart] = swap; 180 } 181 } 182} 183 184/* 185 * parse_long_options -- 186 * Parse long options in argc/argv argument vector. 187 * Returns -1 if short_too is set and the option does not match long_options. 188 */ 189static int 190parse_long_options(char * const *nargv, const char *options, 191 const struct option *long_options, int *idx, int short_too) 192{ 193 char *current_argv, *has_equal; 194 size_t current_argv_len; 195 int i, match; 196 197 current_argv = place; 198 match = -1; 199 200 optind++; 201 202 if ((has_equal = strchr(current_argv, '=')) != NULL) { 203 /* argument found (--option=arg) */ 204 current_argv_len = has_equal - current_argv; 205 has_equal++; 206 } else 207 current_argv_len = strlen(current_argv); 208 209 for (i = 0; long_options[i].name; i++) { 210 /* find matching long option */ 211 if (strncmp(current_argv, long_options[i].name, 212 current_argv_len)) 213 continue; 214 215 if (strlen(long_options[i].name) == current_argv_len) { 216 /* exact match */ 217 match = i; 218 break; 219 } 220 /* 221 * If this is a known short option, don't allow 222 * a partial match of a single character. 223 */ 224 if (short_too && current_argv_len == 1) 225 continue; 226 227 if (match == -1) /* partial match */ 228 match = i; 229 else { 230 /* ambiguous abbreviation */ 231 if (PRINT_ERROR) 232 warnx(ambig, (int)current_argv_len, 233 current_argv); 234 optopt = 0; 235 return (BADCH); 236 } 237 } 238 if (match != -1) { /* option found */ 239 if (long_options[match].has_arg == no_argument 240 && has_equal) { 241 if (PRINT_ERROR) 242 warnx(noarg, (int)current_argv_len, 243 current_argv); 244 /* 245 * XXX: GNU sets optopt to val regardless of flag 246 */ 247 if (long_options[match].flag == NULL) 248 optopt = long_options[match].val; 249 else 250 optopt = 0; 251 return (BADARG); 252 } 253 if (long_options[match].has_arg == required_argument || 254 long_options[match].has_arg == optional_argument) { 255 if (has_equal) 256 optarg = has_equal; 257 else if (long_options[match].has_arg == 258 required_argument) { 259 /* 260 * optional argument doesn't use next nargv 261 */ 262 optarg = nargv[optind++]; 263 } 264 } 265 if ((long_options[match].has_arg == required_argument) 266 && (optarg == NULL)) { 267 /* 268 * Missing argument; leading ':' indicates no error 269 * should be generated. 270 */ 271 if (PRINT_ERROR) 272 warnx(recargstring, 273 current_argv); 274 /* 275 * XXX: GNU sets optopt to val regardless of flag 276 */ 277 if (long_options[match].flag == NULL) 278 optopt = long_options[match].val; 279 else 280 optopt = 0; 281 --optind; 282 return (BADARG); 283 } 284 } else { /* unknown option */ 285 if (short_too) { 286 --optind; 287 return (-1); 288 } 289 if (PRINT_ERROR) 290 warnx(illoptstring, current_argv); 291 optopt = 0; 292 return (BADCH); 293 } 294 if (idx) 295 *idx = match; 296 if (long_options[match].flag) { 297 *long_options[match].flag = long_options[match].val; 298 return (0); 299 } else 300 return (long_options[match].val); 301} 302 303/* 304 * getopt_internal -- 305 * Parse argc/argv argument vector. Called by user level routines. 306 */ 307static int 308getopt_internal(int nargc, char * const *nargv, const char *options, 309 const struct option *long_options, int *idx, int flags) 310{ 311 char *oli; /* option letter list index */ 312 int optchar, short_too; 313 static int posixly_correct = -1; 314 315 if (options == NULL) 316 return (-1); 317 318 /* 319 * XXX Some GNU programs (like cvs) set optind to 0 instead of 320 * XXX using optreset. Work around this braindamage. 321 */ 322 if (optind == 0) 323 optind = optreset = 1; 324 325 /* 326 * Disable GNU extensions if POSIXLY_CORRECT is set or options 327 * string begins with a '+'. 328 */ 329 if (posixly_correct == -1 || optreset) 330 posixly_correct = (getenv("POSIXLY_CORRECT") != NULL); 331 if (*options == '-') 332 flags |= FLAG_ALLARGS; 333 else if (posixly_correct || *options == '+') 334 flags &= ~FLAG_PERMUTE; 335 if (*options == '+' || *options == '-') 336 options++; 337 338 optarg = NULL; 339 if (optreset) 340 nonopt_start = nonopt_end = -1; 341start: 342 if (optreset || !*place) { /* update scanning pointer */ 343 optreset = 0; 344 if (optind >= nargc) { /* end of argument vector */ 345 place = EMSG; 346 if (nonopt_end != -1) { 347 /* do permutation, if we have to */ 348 permute_args(nonopt_start, nonopt_end, 349 optind, nargv); 350 optind -= nonopt_end - nonopt_start; 351 } 352 else if (nonopt_start != -1) { 353 /* 354 * If we skipped non-options, set optind 355 * to the first of them. 356 */ 357 optind = nonopt_start; 358 } 359 nonopt_start = nonopt_end = -1; 360 return (-1); 361 } 362 if (*(place = nargv[optind]) != '-' || 363 (place[1] == '\0' && strchr(options, '-') == NULL)) { 364 place = EMSG; /* found non-option */ 365 if (flags & FLAG_ALLARGS) { 366 /* 367 * GNU extension: 368 * return non-option as argument to option 1 369 */ 370 optarg = nargv[optind++]; 371 return (INORDER); 372 } 373 if (!(flags & FLAG_PERMUTE)) { 374 /* 375 * If no permutation wanted, stop parsing 376 * at first non-option. 377 */ 378 return (-1); 379 } 380 /* do permutation */ 381 if (nonopt_start == -1) 382 nonopt_start = optind; 383 else if (nonopt_end != -1) { 384 permute_args(nonopt_start, nonopt_end, 385 optind, nargv); 386 nonopt_start = optind - 387 (nonopt_end - nonopt_start); 388 nonopt_end = -1; 389 } 390 optind++; 391 /* process next argument */ 392 goto start; 393 } 394 if (nonopt_start != -1 && nonopt_end == -1) 395 nonopt_end = optind; 396 397 /* 398 * If we have "-" do nothing, if "--" we are done. 399 */ 400 if (place[1] != '\0' && *++place == '-' && place[1] == '\0') { 401 optind++; 402 place = EMSG; 403 /* 404 * We found an option (--), so if we skipped 405 * non-options, we have to permute. 406 */ 407 if (nonopt_end != -1) { 408 permute_args(nonopt_start, nonopt_end, 409 optind, nargv); 410 optind -= nonopt_end - nonopt_start; 411 } 412 nonopt_start = nonopt_end = -1; 413 return (-1); 414 } 415 } 416 417 /* 418 * Check long options if: 419 * 1) we were passed some 420 * 2) the arg is not just "-" 421 * 3) either the arg starts with -- we are getopt_long_only() 422 */ 423 if (long_options != NULL && place != nargv[optind] && 424 (*place == '-' || (flags & FLAG_LONGONLY))) { 425 short_too = 0; 426 if (*place == '-') 427 place++; /* --foo long option */ 428 else if (*place != ':' && strchr(options, *place) != NULL) 429 short_too = 1; /* could be short option too */ 430 431 optchar = parse_long_options(nargv, options, long_options, 432 idx, short_too); 433 if (optchar != -1) { 434 place = EMSG; 435 return (optchar); 436 } 437 } 438 439 if ((optchar = (int)*place++) == (int)':' || 440 (optchar == (int)'-' && *place != '\0') || 441 (oli = strchr(options, optchar)) == NULL) { 442 /* 443 * If the user specified "-" and '-' isn't listed in 444 * options, return -1 (non-option) as per POSIX. 445 * Otherwise, it is an unknown option character (or ':'). 446 */ 447 if (optchar == (int)'-' && *place == '\0') 448 return (-1); 449 if (!*place) 450 ++optind; 451 if (PRINT_ERROR) 452 warnx(illoptchar, optchar); 453 optopt = optchar; 454 return (BADCH); 455 } 456 if (long_options != NULL && optchar == 'W' && oli[1] == ';') { 457 /* -W long-option */ 458 if (*place) /* no space */ 459 /* NOTHING */; 460 else if (++optind >= nargc) { /* no arg */ 461 place = EMSG; 462 if (PRINT_ERROR) 463 warnx(recargchar, optchar); 464 optopt = optchar; 465 return (BADARG); 466 } else /* white space */ 467 place = nargv[optind]; 468 optchar = parse_long_options(nargv, options, long_options, 469 idx, 0); 470 place = EMSG; 471 return (optchar); 472 } 473 if (*++oli != ':') { /* doesn't take argument */ 474 if (!*place) 475 ++optind; 476 } else { /* takes (optional) argument */ 477 optarg = NULL; 478 if (*place) /* no white space */ 479 optarg = place; 480 else if (oli[1] != ':') { /* arg not optional */ 481 if (++optind >= nargc) { /* no arg */ 482 place = EMSG; 483 if (PRINT_ERROR) 484 warnx(recargchar, optchar); 485 optopt = optchar; 486 return (BADARG); 487 } else 488 optarg = nargv[optind]; 489 } 490 place = EMSG; 491 ++optind; 492 } 493 /* dump back option letter */ 494 return (optchar); 495} 496 497/* 498 * getopt -- 499 * Parse argc/argv argument vector. 500 * 501 * [eventually this will replace the BSD getopt] 502 */ 503int 504getopt(int nargc, char * const *nargv, const char *options) 505{ 506 507 /* 508 * We don't pass FLAG_PERMUTE to getopt_internal() since 509 * the BSD getopt(3) (unlike GNU) has never done this. 510 * 511 * Furthermore, since many privileged programs call getopt() 512 * before dropping privileges it makes sense to keep things 513 * as simple (and bug-free) as possible. 514 */ 515 return (getopt_internal(nargc, nargv, options, NULL, NULL, 0)); 516} 517 518#if 0 519/* 520 * getopt_long -- 521 * Parse argc/argv argument vector. 522 */ 523int 524getopt_long(int nargc, char * const *nargv, const char *options, 525 const struct option *long_options, int *idx) 526{ 527 528 return (getopt_internal(nargc, nargv, options, long_options, idx, 529 FLAG_PERMUTE)); 530} 531 532/* 533 * getopt_long_only -- 534 * Parse argc/argv argument vector. 535 */ 536int 537getopt_long_only(int nargc, char * const *nargv, const char *options, 538 const struct option *long_options, int *idx) 539{ 540 541 return (getopt_internal(nargc, nargv, options, long_options, idx, 542 FLAG_PERMUTE|FLAG_LONGONLY)); 543} 544#endif 545 546#endif /* !defined(HAVE_GETOPT) || !defined(HAVE_OPTRESET) */ 547