contrib/file/src/getopt_long.c

   1 /*      $NetBSD: getopt_long.c,v 1.21.4.1 2008/01/09 01:34:14 matt 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 #include "file.h"
  33
  34 #ifndef lint
  35 FILE_RCSID("@(#)$File: getopt_long.c,v 1.6 2009/02/13 18:48:05 christos Exp $")
  36 #endif  /* lint */
  37
  38 #include <assert.h>
  39 #ifdef HAVE_ERR_H
  40 #include <err.h>
  41 #else
  42 #define warnx printf
  43 #endif
  44 #include <errno.h>
  45 #if defined(HAVE_GETOPT_H) && defined(HAVE_STRUCT_OPTION)
  46 #include <getopt.h>
  47 #else
  48 #include "mygetopt.h"
  49 #endif
  50 #include <stdlib.h>
  51 #include <string.h>
  52
  53 #define REPLACE_GETOPT
  54
  55 #ifndef _DIAGASSERT
  56 #define _DIAGASSERT assert
  57 #endif
  58
  59 #ifdef REPLACE_GETOPT
  60 #ifdef __weak_alias
  61 __weak_alias(getopt,_getopt)
  62 #endif
  63 int     opterr = 1;             /* if error message should be printed */
  64 int     optind = 1;             /* index into parent argv vector */
  65 int     optopt = '?';           /* character checked for validity */
  66 int     optreset;               /* reset getopt */
  67 char    *optarg;                /* argument associated with option */
  68 #elif HAVE_NBTOOL_CONFIG_H && !HAVE_DECL_OPTRESET
  69 static int optreset;
  70 #endif
  71
  72 #ifdef __weak_alias
  73 __weak_alias(getopt_long,_getopt_long)
  74 #endif
  75
  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(int, char **, const char *);
  93 static int gcd(int, int);
  94 static void permute_args(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 = (char *)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, (char **)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                                      (char **)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 #define IDENTICAL_INTERPRETATION(_x, _y)                                \
 366         (long_options[(_x)].has_arg == long_options[(_y)].has_arg &&    \
 367          long_options[(_x)].flag == long_options[(_y)].flag &&          \
 368          long_options[(_x)].val == long_options[(_y)].val)
 369
 370         _DIAGASSERT(nargv != NULL);
 371         _DIAGASSERT(options != NULL);
 372         _DIAGASSERT(long_options != NULL);
 373         /* idx may be NULL */
 374
 375         retval = getopt_internal(nargc, (char **)nargv, options);
 376         if (retval == -2) {
 377                 char *current_argv, *has_equal;
 378                 size_t current_argv_len;
 379                 int i, ambiguous, match;
 380
 381                 current_argv = (char *)place;
 382                 match = -1;
 383                 ambiguous = 0;
 384
 385                 optind++;
 386                 place = EMSG;
 387
 388                 if (*current_argv == '\0') {            /* found "--" */
 389                         /*
 390                          * We found an option (--), so if we skipped
 391                          * non-options, we have to permute.
 392                          */
 393                         if (nonopt_end != -1) {
 394                                 permute_args(nonopt_start, nonopt_end,
 395                                              optind, (char **)nargv);
 396                                 optind -= nonopt_end - nonopt_start;
 397                         }
 398                         nonopt_start = nonopt_end = -1;
 399                         return -1;
 400                 }
 401                 if ((has_equal = strchr(current_argv, '=')) != NULL) {
 402                         /* argument found (--option=arg) */
 403                         current_argv_len = has_equal - current_argv;
 404                         has_equal++;
 405                 } else
 406                         current_argv_len = strlen(current_argv);
 407
 408                 for (i = 0; long_options[i].name; i++) {
 409                         /* find matching long option */
 410                         if (strncmp(current_argv, long_options[i].name,
 411                             current_argv_len))
 412                                 continue;
 413
 414                         if (strlen(long_options[i].name) ==
 415                             (unsigned)current_argv_len) {
 416                                 /* exact match */
 417                                 match = i;
 418                                 ambiguous = 0;
 419                                 break;
 420                         }
 421                         if (match == -1)                /* partial match */
 422                                 match = i;
 423                         else if (!IDENTICAL_INTERPRETATION(i, match))
 424                                 ambiguous = 1;
 425                 }
 426                 if (ambiguous) {
 427                         /* ambiguous abbreviation */
 428                         if (PRINT_ERROR)
 429                                 warnx(ambig, (int)current_argv_len,
 430                                      current_argv);
 431                         optopt = 0;
 432                         return BADCH;
 433                 }
 434                 if (match != -1) {                      /* option found */
 435                         if (long_options[match].has_arg == no_argument
 436                             && has_equal) {
 437                                 if (PRINT_ERROR)
 438                                         warnx(noarg, (int)current_argv_len,
 439                                              current_argv);
 440                                 /*
 441                                  * XXX: GNU sets optopt to val regardless of
 442                                  * flag
 443                                  */
 444                                 if (long_options[match].flag == NULL)
 445                                         optopt = long_options[match].val;
 446                                 else
 447                                         optopt = 0;
 448                                 return BADARG;
 449                         }
 450                         if (long_options[match].has_arg == required_argument ||
 451                             long_options[match].has_arg == optional_argument) {
 452                                 if (has_equal)
 453                                         optarg = has_equal;
 454                                 else if (long_options[match].has_arg ==
 455                                     required_argument) {
 456                                         /*
 457                                          * optional argument doesn't use
 458                                          * next nargv
 459                                          */
 460                                         optarg = nargv[optind++];
 461                                 }
 462                         }
 463                         if ((long_options[match].has_arg == required_argument)
 464                             && (optarg == NULL)) {
 465                                 /*
 466                                  * Missing argument; leading ':'
 467                                  * indicates no error should be generated
 468                                  */
 469                                 if (PRINT_ERROR)
 470                                         warnx(recargstring, current_argv);
 471                                 /*
 472                                  * XXX: GNU sets optopt to val regardless
 473                                  * of flag
 474                                  */
 475                                 if (long_options[match].flag == NULL)
 476                                         optopt = long_options[match].val;
 477                                 else
 478                                         optopt = 0;
 479                                 --optind;
 480                                 return BADARG;
 481                         }
 482                 } else {                        /* unknown option */
 483                         if (PRINT_ERROR)
 484                                 warnx(illoptstring, current_argv);
 485                         optopt = 0;
 486                         return BADCH;
 487                 }
 488                 if (long_options[match].flag) {
 489                         *long_options[match].flag = long_options[match].val;
 490                         retval = 0;
 491                 } else
 492                         retval = long_options[match].val;
 493                 if (idx)
 494                         *idx = match;
 495         }
 496         return retval;
 497 #undef IDENTICAL_INTERPRETATION
 498 }