1 /* $NetBSD: getopt_long.c,v 1.20 2006/10/04 17:29:42 wiz Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Dieter Baron and Thomas Klausner. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #if HAVE_NBTOOL_CONFIG_H 33 #include "nbtool_config.h" 34 #endif 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 __RCSID("$NetBSD: getopt_long.c,v 1.20 2006/10/04 17:29:42 wiz Exp $"); 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 43 #include <assert.h> 44 #include <err.h> 45 #include <errno.h> 46 #if HAVE_NBTOOL_CONFIG_H 47 #include "compat_getopt.h" 48 #else 49 #include <getopt.h> 50 #endif 51 #include <stdlib.h> 52 #include <string.h> 53 54 #if HAVE_NBTOOL_CONFIG_H && !HAVE_GETOPT_LONG && !HAVE_DECL_OPTIND 55 #define REPLACE_GETOPT 56 #endif 57 58 #ifdef REPLACE_GETOPT 59 #ifdef __weak_alias 60 __weak_alias(getopt,_getopt) 61 #endif 62 int opterr = 1; /* if error message should be printed */ 63 int optind = 1; /* index into parent argv vector */ 64 int optopt = '?'; /* character checked for validity */ 65 int optreset; /* reset getopt */ 66 char *optarg; /* argument associated with option */ 67 #elif HAVE_NBTOOL_CONFIG_H && !HAVE_DECL_OPTRESET 68 static int optreset; 69 #endif 70 71 #ifdef __weak_alias 72 __weak_alias(getopt_long,_getopt_long) 73 #endif 74 75 #if !HAVE_GETOPT_LONG 76 #define IGNORE_FIRST (*options == '-' || *options == '+') 77 #define PRINT_ERROR ((opterr) && ((*options != ':') \ 78 || (IGNORE_FIRST && options[1] != ':'))) 79 #define IS_POSIXLY_CORRECT (getenv("POSIXLY_CORRECT") != NULL) 80 #define PERMUTE (!IS_POSIXLY_CORRECT && !IGNORE_FIRST) 81 /* XXX: GNU ignores PC if *options == '-' */ 82 #define IN_ORDER (!IS_POSIXLY_CORRECT && *options == '-') 83 84 /* return values */ 85 #define BADCH (int)'?' 86 #define BADARG ((IGNORE_FIRST && options[1] == ':') \ 87 || (*options == ':') ? (int)':' : (int)'?') 88 #define INORDER (int)1 89 90 #define EMSG "" 91 92 static int getopt_internal __P((int, char **, const char *)); 93 static int gcd __P((int, int)); 94 static void permute_args __P((int, int, int, char **)); 95 96 static const char *place = EMSG; /* option letter processing */ 97 98 /* XXX: set optreset to 1 rather than these two */ 99 static int nonopt_start = -1; /* first non option argument (for permute) */ 100 static int nonopt_end = -1; /* first option after non options (for permute) */ 101 102 /* Error messages */ 103 static const char recargchar[] = "option requires an argument -- %c"; 104 static const char recargstring[] = "option requires an argument -- %s"; 105 static const char ambig[] = "ambiguous option -- %.*s"; 106 static const char noarg[] = "option doesn't take an argument -- %.*s"; 107 static const char illoptchar[] = "unknown option -- %c"; 108 static const char illoptstring[] = "unknown option -- %s"; 109 110 111 /* 112 * Compute the greatest common divisor of a and b. 113 */ 114 static int 115 gcd(a, b) 116 int a; 117 int b; 118 { 119 int c; 120 121 c = a % b; 122 while (c != 0) { 123 a = b; 124 b = c; 125 c = a % b; 126 } 127 128 return b; 129 } 130 131 /* 132 * Exchange the block from nonopt_start to nonopt_end with the block 133 * from nonopt_end to opt_end (keeping the same order of arguments 134 * in each block). 135 */ 136 static void 137 permute_args(panonopt_start, panonopt_end, opt_end, nargv) 138 int panonopt_start; 139 int panonopt_end; 140 int opt_end; 141 char **nargv; 142 { 143 int cstart, cyclelen, i, j, ncycle, nnonopts, nopts, pos; 144 char *swap; 145 146 _DIAGASSERT(nargv != NULL); 147 148 /* 149 * compute lengths of blocks and number and size of cycles 150 */ 151 nnonopts = panonopt_end - panonopt_start; 152 nopts = opt_end - panonopt_end; 153 ncycle = gcd(nnonopts, nopts); 154 cyclelen = (opt_end - panonopt_start) / ncycle; 155 156 for (i = 0; i < ncycle; i++) { 157 cstart = panonopt_end+i; 158 pos = cstart; 159 for (j = 0; j < cyclelen; j++) { 160 if (pos >= panonopt_end) 161 pos -= nnonopts; 162 else 163 pos += nopts; 164 swap = nargv[pos]; 165 nargv[pos] = nargv[cstart]; 166 nargv[cstart] = swap; 167 } 168 } 169 } 170 171 /* 172 * getopt_internal -- 173 * Parse argc/argv argument vector. Called by user level routines. 174 * Returns -2 if -- is found (can be long option or end of options marker). 175 */ 176 static int 177 getopt_internal(nargc, nargv, options) 178 int nargc; 179 char **nargv; 180 const char *options; 181 { 182 char *oli; /* option letter list index */ 183 int optchar; 184 185 _DIAGASSERT(nargv != NULL); 186 _DIAGASSERT(options != NULL); 187 188 optarg = NULL; 189 190 /* 191 * XXX Some programs (like rsyncd) expect to be able to 192 * XXX re-initialize optind to 0 and have getopt_long(3) 193 * XXX properly function again. Work around this braindamage. 194 */ 195 if (optind == 0) 196 optind = 1; 197 198 if (optreset) 199 nonopt_start = nonopt_end = -1; 200 start: 201 if (optreset || !*place) { /* update scanning pointer */ 202 optreset = 0; 203 if (optind >= nargc) { /* end of argument vector */ 204 place = EMSG; 205 if (nonopt_end != -1) { 206 /* do permutation, if we have to */ 207 permute_args(nonopt_start, nonopt_end, 208 optind, nargv); 209 optind -= nonopt_end - nonopt_start; 210 } 211 else if (nonopt_start != -1) { 212 /* 213 * If we skipped non-options, set optind 214 * to the first of them. 215 */ 216 optind = nonopt_start; 217 } 218 nonopt_start = nonopt_end = -1; 219 return -1; 220 } 221 if ((*(place = nargv[optind]) != '-') 222 || (place[1] == '\0')) { /* found non-option */ 223 place = EMSG; 224 if (IN_ORDER) { 225 /* 226 * GNU extension: 227 * return non-option as argument to option 1 228 */ 229 optarg = nargv[optind++]; 230 return INORDER; 231 } 232 if (!PERMUTE) { 233 /* 234 * if no permutation wanted, stop parsing 235 * at first non-option 236 */ 237 return -1; 238 } 239 /* do permutation */ 240 if (nonopt_start == -1) 241 nonopt_start = optind; 242 else if (nonopt_end != -1) { 243 permute_args(nonopt_start, nonopt_end, 244 optind, nargv); 245 nonopt_start = optind - 246 (nonopt_end - nonopt_start); 247 nonopt_end = -1; 248 } 249 optind++; 250 /* process next argument */ 251 goto start; 252 } 253 if (nonopt_start != -1 && nonopt_end == -1) 254 nonopt_end = optind; 255 if (place[1] && *++place == '-') { /* found "--" */ 256 place++; 257 return -2; 258 } 259 } 260 if ((optchar = (int)*place++) == (int)':' || 261 (oli = strchr(options + (IGNORE_FIRST ? 1 : 0), optchar)) == NULL) { 262 /* option letter unknown or ':' */ 263 if (!*place) 264 ++optind; 265 if (PRINT_ERROR) 266 warnx(illoptchar, optchar); 267 optopt = optchar; 268 return BADCH; 269 } 270 if (optchar == 'W' && oli[1] == ';') { /* -W long-option */ 271 /* XXX: what if no long options provided (called by getopt)? */ 272 if (*place) 273 return -2; 274 275 if (++optind >= nargc) { /* no arg */ 276 place = EMSG; 277 if (PRINT_ERROR) 278 warnx(recargchar, optchar); 279 optopt = optchar; 280 return BADARG; 281 } else /* white space */ 282 place = nargv[optind]; 283 /* 284 * Handle -W arg the same as --arg (which causes getopt to 285 * stop parsing). 286 */ 287 return -2; 288 } 289 if (*++oli != ':') { /* doesn't take argument */ 290 if (!*place) 291 ++optind; 292 } else { /* takes (optional) argument */ 293 optarg = NULL; 294 if (*place) /* no white space */ 295 optarg = __UNCONST(place); 296 /* XXX: disable test for :: if PC? (GNU doesn't) */ 297 else if (oli[1] != ':') { /* arg not optional */ 298 if (++optind >= nargc) { /* no arg */ 299 place = EMSG; 300 if (PRINT_ERROR) 301 warnx(recargchar, optchar); 302 optopt = optchar; 303 return BADARG; 304 } else 305 optarg = nargv[optind]; 306 } 307 place = EMSG; 308 ++optind; 309 } 310 /* dump back option letter */ 311 return optchar; 312 } 313 314 #ifdef REPLACE_GETOPT 315 /* 316 * getopt -- 317 * Parse argc/argv argument vector. 318 * 319 * [eventually this will replace the real getopt] 320 */ 321 int 322 getopt(nargc, nargv, options) 323 int nargc; 324 char * const *nargv; 325 const char *options; 326 { 327 int retval; 328 329 _DIAGASSERT(nargv != NULL); 330 _DIAGASSERT(options != NULL); 331 332 retval = getopt_internal(nargc, __UNCONST(nargv), options); 333 if (retval == -2) { 334 ++optind; 335 /* 336 * We found an option (--), so if we skipped non-options, 337 * we have to permute. 338 */ 339 if (nonopt_end != -1) { 340 permute_args(nonopt_start, nonopt_end, optind, 341 nargv); 342 optind -= nonopt_end - nonopt_start; 343 } 344 nonopt_start = nonopt_end = -1; 345 retval = -1; 346 } 347 return retval; 348 } 349 #endif 350 351 /* 352 * getopt_long -- 353 * Parse argc/argv argument vector. 354 */ 355 int 356 getopt_long(nargc, nargv, options, long_options, idx) 357 int nargc; 358 char * const *nargv; 359 const char *options; 360 const struct option *long_options; 361 int *idx; 362 { 363 int retval; 364 365 _DIAGASSERT(nargv != NULL); 366 _DIAGASSERT(options != NULL); 367 _DIAGASSERT(long_options != NULL); 368 /* idx may be NULL */ 369 370 retval = getopt_internal(nargc, __UNCONST(nargv), options); 371 if (retval == -2) { 372 char *current_argv, *has_equal; 373 size_t current_argv_len; 374 int i, match; 375 376 current_argv = __UNCONST(place); 377 match = -1; 378 379 optind++; 380 place = EMSG; 381 382 if (*current_argv == '\0') { /* found "--" */ 383 /* 384 * We found an option (--), so if we skipped 385 * non-options, we have to permute. 386 */ 387 if (nonopt_end != -1) { 388 permute_args(nonopt_start, nonopt_end, 389 optind, __UNCONST(nargv)); 390 optind -= nonopt_end - nonopt_start; 391 } 392 nonopt_start = nonopt_end = -1; 393 return -1; 394 } 395 if ((has_equal = strchr(current_argv, '=')) != NULL) { 396 /* argument found (--option=arg) */ 397 current_argv_len = has_equal - current_argv; 398 has_equal++; 399 } else 400 current_argv_len = strlen(current_argv); 401 402 for (i = 0; long_options[i].name; i++) { 403 /* find matching long option */ 404 if (strncmp(current_argv, long_options[i].name, 405 current_argv_len)) 406 continue; 407 408 if (strlen(long_options[i].name) == 409 (unsigned)current_argv_len) { 410 /* exact match */ 411 match = i; 412 break; 413 } 414 if (match == -1) /* partial match */ 415 match = i; 416 else { 417 /* ambiguous abbreviation */ 418 if (PRINT_ERROR) 419 warnx(ambig, (int)current_argv_len, 420 current_argv); 421 optopt = 0; 422 return BADCH; 423 } 424 } 425 if (match != -1) { /* option found */ 426 if (long_options[match].has_arg == no_argument 427 && has_equal) { 428 if (PRINT_ERROR) 429 warnx(noarg, (int)current_argv_len, 430 current_argv); 431 /* 432 * XXX: GNU sets optopt to val regardless of 433 * flag 434 */ 435 if (long_options[match].flag == NULL) 436 optopt = long_options[match].val; 437 else 438 optopt = 0; 439 return BADARG; 440 } 441 if (long_options[match].has_arg == required_argument || 442 long_options[match].has_arg == optional_argument) { 443 if (has_equal) 444 optarg = has_equal; 445 else if (long_options[match].has_arg == 446 required_argument) { 447 /* 448 * optional argument doesn't use 449 * next nargv 450 */ 451 optarg = nargv[optind++]; 452 } 453 } 454 if ((long_options[match].has_arg == required_argument) 455 && (optarg == NULL)) { 456 /* 457 * Missing argument; leading ':' 458 * indicates no error should be generated 459 */ 460 if (PRINT_ERROR) 461 warnx(recargstring, current_argv); 462 /* 463 * XXX: GNU sets optopt to val regardless 464 * of flag 465 */ 466 if (long_options[match].flag == NULL) 467 optopt = long_options[match].val; 468 else 469 optopt = 0; 470 --optind; 471 return BADARG; 472 } 473 } else { /* unknown option */ 474 if (PRINT_ERROR) 475 warnx(illoptstring, current_argv); 476 optopt = 0; 477 return BADCH; 478 } 479 if (long_options[match].flag) { 480 *long_options[match].flag = long_options[match].val; 481 retval = 0; 482 } else 483 retval = long_options[match].val; 484 if (idx) 485 *idx = match; 486 } 487 return retval; 488 } 489 #endif /* !GETOPT_LONG */ 490