external/bsd/tcpdump/dist/missing/getopt_long.c

   1 /*      $OpenBSD: getopt_long.c,v 1.22 2006/10/04 21:29:04 jmc 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
  53 #include <errno.h>
  54 #include "getopt_long.h"
  55 #include <stdlib.h>
  56 #include <stdio.h>
  57 #include <string.h>
  58 #include <stdarg.h>
  59
  60 #define GNU_COMPATIBLE          /* Be more compatible, configure's use us! */
  61
  62 #define PRINT_ERROR     ((opterr) && (*options != ':'))
  63
  64 #define FLAG_PERMUTE    0x01    /* permute non-options to the end of argv */
  65 #define FLAG_ALLARGS    0x02    /* treat non-options as args to option "-1" */
  66 #define FLAG_LONGONLY   0x04    /* operate as getopt_long_only */
  67
  68 /* return values */
  69 #define BADCH           (int)'?'
  70 #define BADARG          ((*options == ':') ? (int)':' : (int)'?')
  71 #define INORDER         (int)1
  72
  73 #define EMSG            ""
  74
  75 #ifdef GNU_COMPATIBLE
  76 #define NO_PREFIX       (-1)
  77 #define D_PREFIX        0
  78 #define DD_PREFIX       1
  79 #define W_PREFIX        2
  80 #endif
  81
  82 char *optarg;
  83 int optind, opterr = 1, optopt;
  84
  85 static int getopt_internal(int, char * const *, const char *,
  86                            const struct option *, int *, int);
  87 static int parse_long_options(char * const *, const char *,
  88                               const struct option *, int *, int, int);
  89 static int gcd(int, int);
  90 static void permute_args(int, int, int, char * const *);
  91
  92 static const char *place = EMSG; /* option letter processing */
  93
  94 static int nonopt_start = -1; /* first non option argument (for permute) */
  95 static int nonopt_end = -1;   /* first option after non options (for permute) */
  96
  97 /* Error messages */
  98 static const char recargchar[] = "option requires an argument -- %c";
  99 static const char illoptchar[] = "illegal option -- %c"; /* From P1003.2 */
 100 #ifdef GNU_COMPATIBLE
 101 static int dash_prefix = NO_PREFIX;
 102 static const char gnuoptchar[] = "invalid option -- %c";
 103
 104 static const char recargstring[] = "option `%s%s' requires an argument";
 105 static const char ambig[] = "option `%s%.*s' is ambiguous";
 106 static const char noarg[] = "option `%s%.*s' doesn't allow an argument";
 107 static const char illoptstring[] = "unrecognized option `%s%s'";
 108 #else
 109 static const char recargstring[] = "option requires an argument -- %s";
 110 static const char ambig[] = "ambiguous option -- %.*s";
 111 static const char noarg[] = "option doesn't take an argument -- %.*s";
 112 static const char illoptstring[] = "unknown option -- %s";
 113 #endif
 114
 115 /*
 116  * Compute the greatest common divisor of a and b.
 117  */
 118 static int
 119 gcd(int a, int b)
 120 {
 121         int c;
 122
 123         c = a % b;
 124         while (c != 0) {
 125                 a = b;
 126                 b = c;
 127                 c = a % b;
 128         }
 129
 130         return (b);
 131 }
 132
 133 /*
 134  * Exchange the block from nonopt_start to nonopt_end with the block
 135  * from nonopt_end to opt_end (keeping the same order of arguments
 136  * in each block).
 137  */
 138 static void
 139 permute_args(int panonopt_start, int panonopt_end, int opt_end,
 140         char * const *nargv)
 141 {
 142         int cstart, cyclelen, i, j, ncycle, nnonopts, nopts, pos;
 143         char *swap;
 144
 145         /*
 146          * compute lengths of blocks and number and size of cycles
 147          */
 148         nnonopts = panonopt_end - panonopt_start;
 149         nopts = opt_end - panonopt_end;
 150         ncycle = gcd(nnonopts, nopts);
 151         cyclelen = (opt_end - panonopt_start) / ncycle;
 152
 153         for (i = 0; i < ncycle; i++) {
 154                 cstart = panonopt_end+i;
 155                 pos = cstart;
 156                 for (j = 0; j < cyclelen; j++) {
 157                         if (pos >= panonopt_end)
 158                                 pos -= nnonopts;
 159                         else
 160                                 pos += nopts;
 161                         swap = nargv[pos];
 162                         /* LINTED const cast */
 163                         ((char **) nargv)[pos] = nargv[cstart];
 164                         /* LINTED const cast */
 165                         ((char **)nargv)[cstart] = swap;
 166                 }
 167         }
 168 }
 169
 170 static void
 171 warnx(const char *fmt, ...)
 172 {
 173         extern char *program_name;
 174         va_list ap;
 175
 176         va_start(ap, fmt);
 177         fprintf(stderr, "%s: ", program_name);
 178         vfprintf(stderr, fmt, ap);
 179         fprintf(stderr, "\n");
 180         va_end(ap);
 181 }
 182
 183 /*
 184  * parse_long_options --
 185  *      Parse long options in argc/argv argument vector.
 186  * Returns -1 if short_too is set and the option does not match long_options.
 187  */
 188 static int
 189 parse_long_options(char * const *nargv, const char *options,
 190         const struct option *long_options, int *idx, int short_too, int flags)
 191 {
 192         const char *current_argv, *has_equal;
 193 #ifdef GNU_COMPATIBLE
 194         const char *current_dash;
 195 #endif
 196         size_t current_argv_len;
 197         int i, match, exact_match, second_partial_match;
 198
 199         current_argv = place;
 200 #ifdef GNU_COMPATIBLE
 201         switch (dash_prefix) {
 202                 case D_PREFIX:
 203                         current_dash = "-";
 204                         break;
 205                 case DD_PREFIX:
 206                         current_dash = "--";
 207                         break;
 208                 case W_PREFIX:
 209                         current_dash = "-W ";
 210                         break;
 211                 default:
 212                         current_dash = "";
 213                         break;
 214         }
 215 #endif
 216         match = -1;
 217         exact_match = 0;
 218         second_partial_match = 0;
 219
 220         optind++;
 221
 222         if ((has_equal = strchr(current_argv, '=')) != NULL) {
 223                 /* argument found (--option=arg) */
 224                 current_argv_len = has_equal - current_argv;
 225                 has_equal++;
 226         } else
 227                 current_argv_len = strlen(current_argv);
 228
 229         for (i = 0; long_options[i].name; i++) {
 230                 /* find matching long option */
 231                 if (strncmp(current_argv, long_options[i].name,
 232                     current_argv_len))
 233                         continue;
 234
 235                 if (strlen(long_options[i].name) == current_argv_len) {
 236                         /* exact match */
 237                         match = i;
 238                         exact_match = 1;
 239                         break;
 240                 }
 241                 /*
 242                  * If this is a known short option, don't allow
 243                  * a partial match of a single character.
 244                  */
 245                 if (short_too && current_argv_len == 1)
 246                         continue;
 247
 248                 if (match == -1)        /* first partial match */
 249                         match = i;
 250                 else if ((flags & FLAG_LONGONLY) ||
 251                          long_options[i].has_arg !=
 252                              long_options[match].has_arg ||
 253                          long_options[i].flag != long_options[match].flag ||
 254                          long_options[i].val != long_options[match].val)
 255                         second_partial_match = 1;
 256         }
 257         if (!exact_match && second_partial_match) {
 258                 /* ambiguous abbreviation */
 259                 if (PRINT_ERROR)
 260                         warnx(ambig,
 261 #ifdef GNU_COMPATIBLE
 262                              current_dash,
 263 #endif
 264                              (int)current_argv_len,
 265                              current_argv);
 266                 optopt = 0;
 267                 return (BADCH);
 268         }
 269         if (match != -1) {              /* option found */
 270                 if (long_options[match].has_arg == no_argument
 271                     && has_equal) {
 272                         if (PRINT_ERROR)
 273                                 warnx(noarg,
 274 #ifdef GNU_COMPATIBLE
 275                                      current_dash,
 276 #endif
 277                                      (int)current_argv_len,
 278                                      current_argv);
 279                         /*
 280                          * XXX: GNU sets optopt to val regardless of flag
 281                          */
 282                         if (long_options[match].flag == NULL)
 283                                 optopt = long_options[match].val;
 284                         else
 285                                 optopt = 0;
 286 #ifdef GNU_COMPATIBLE
 287                         return (BADCH);
 288 #else
 289                         return (BADARG);
 290 #endif
 291                 }
 292                 if (long_options[match].has_arg == required_argument ||
 293                     long_options[match].has_arg == optional_argument) {
 294                         if (has_equal)
 295                                 optarg = (char *)has_equal;
 296                         else if (long_options[match].has_arg ==
 297                             required_argument) {
 298                                 /*
 299                                  * optional argument doesn't use next nargv
 300                                  */
 301                                 optarg = nargv[optind++];
 302                         }
 303                 }
 304                 if ((long_options[match].has_arg == required_argument)
 305                     && (optarg == NULL)) {
 306                         /*
 307                          * Missing argument; leading ':' indicates no error
 308                          * should be generated.
 309                          */
 310                         if (PRINT_ERROR)
 311                                 warnx(recargstring,
 312 #ifdef GNU_COMPATIBLE
 313                                     current_dash,
 314 #endif
 315                                     current_argv);
 316                         /*
 317                          * XXX: GNU sets optopt to val regardless of flag
 318                          */
 319                         if (long_options[match].flag == NULL)
 320                                 optopt = long_options[match].val;
 321                         else
 322                                 optopt = 0;
 323                         --optind;
 324                         return (BADARG);
 325                 }
 326         } else {                        /* unknown option */
 327                 if (short_too) {
 328                         --optind;
 329                         return (-1);
 330                 }
 331                 if (PRINT_ERROR)
 332                         warnx(illoptstring,
 333 #ifdef GNU_COMPATIBLE
 334                               current_dash,
 335 #endif
 336                               current_argv);
 337                 optopt = 0;
 338                 return (BADCH);
 339         }
 340         if (idx)
 341                 *idx = match;
 342         if (long_options[match].flag) {
 343                 *long_options[match].flag = long_options[match].val;
 344                 return (0);
 345         } else
 346                 return (long_options[match].val);
 347 }
 348
 349 /*
 350  * getopt_internal --
 351  *      Parse argc/argv argument vector.  Called by user level routines.
 352  */
 353 static int
 354 getopt_internal(int nargc, char * const *nargv, const char *options,
 355         const struct option *long_options, int *idx, int flags)
 356 {
 357         char *oli;                              /* option letter list index */
 358         int optchar, short_too;
 359         int posixly_correct;    /* no static, can be changed on the fly */
 360
 361         if (options == NULL)
 362                 return (-1);
 363
 364         /*
 365          * Disable GNU extensions if POSIXLY_CORRECT is set or options
 366          * string begins with a '+'.
 367          */
 368         posixly_correct = (getenv("POSIXLY_CORRECT") != NULL);
 369 #ifdef GNU_COMPATIBLE
 370         if (*options == '-')
 371                 flags |= FLAG_ALLARGS;
 372         else if (posixly_correct || *options == '+')
 373                 flags &= ~FLAG_PERMUTE;
 374 #else
 375         if (posixly_correct || *options == '+')
 376                 flags &= ~FLAG_PERMUTE;
 377         else if (*options == '-')
 378                 flags |= FLAG_ALLARGS;
 379 #endif
 380         if (*options == '+' || *options == '-')
 381                 options++;
 382
 383         /*
 384          * XXX Some GNU programs (like cvs) set optind to 0 instead of
 385          * XXX using optreset.  Work around this braindamage.
 386          */
 387         if (optind == 0)
 388                 optind = 1;
 389
 390         optarg = NULL;
 391 start:
 392         if (!*place) {                          /* update scanning pointer */
 393                 if (optind >= nargc) {          /* end of argument vector */
 394                         place = EMSG;
 395                         if (nonopt_end != -1) {
 396                                 /* do permutation, if we have to */
 397                                 permute_args(nonopt_start, nonopt_end,
 398                                     optind, nargv);
 399                                 optind -= nonopt_end - nonopt_start;
 400                         }
 401                         else if (nonopt_start != -1) {
 402                                 /*
 403                                  * If we skipped non-options, set optind
 404                                  * to the first of them.
 405                                  */
 406                                 optind = nonopt_start;
 407                         }
 408                         nonopt_start = nonopt_end = -1;
 409                         return (-1);
 410                 }
 411                 if (*(place = nargv[optind]) != '-' ||
 412 #ifdef GNU_COMPATIBLE
 413                     place[1] == '\0') {
 414 #else
 415                     (place[1] == '\0' && strchr(options, '-') == NULL)) {
 416 #endif
 417                         place = EMSG;           /* found non-option */
 418                         if (flags & FLAG_ALLARGS) {
 419                                 /*
 420                                  * GNU extension:
 421                                  * return non-option as argument to option 1
 422                                  */
 423                                 optarg = nargv[optind++];
 424                                 return (INORDER);
 425                         }
 426                         if (!(flags & FLAG_PERMUTE)) {
 427                                 /*
 428                                  * If no permutation wanted, stop parsing
 429                                  * at first non-option.
 430                                  */
 431                                 return (-1);
 432                         }
 433                         /* do permutation */
 434                         if (nonopt_start == -1)
 435                                 nonopt_start = optind;
 436                         else if (nonopt_end != -1) {
 437                                 permute_args(nonopt_start, nonopt_end,
 438                                     optind, nargv);
 439                                 nonopt_start = optind -
 440                                     (nonopt_end - nonopt_start);
 441                                 nonopt_end = -1;
 442                         }
 443                         optind++;
 444                         /* process next argument */
 445                         goto start;
 446                 }
 447                 if (nonopt_start != -1 && nonopt_end == -1)
 448                         nonopt_end = optind;
 449
 450                 /*
 451                  * If we have "-" do nothing, if "--" we are done.
 452                  */
 453                 if (place[1] != '\0' && *++place == '-' && place[1] == '\0') {
 454                         optind++;
 455                         place = EMSG;
 456                         /*
 457                          * We found an option (--), so if we skipped
 458                          * non-options, we have to permute.
 459                          */
 460                         if (nonopt_end != -1) {
 461                                 permute_args(nonopt_start, nonopt_end,
 462                                     optind, nargv);
 463                                 optind -= nonopt_end - nonopt_start;
 464                         }
 465                         nonopt_start = nonopt_end = -1;
 466                         return (-1);
 467                 }
 468         }
 469
 470         /*
 471          * Check long options if:
 472          *  1) we were passed some
 473          *  2) the arg is not just "-"
 474          *  3) either the arg starts with -- we are getopt_long_only()
 475          */
 476         if (long_options != NULL && place != nargv[optind] &&
 477             (*place == '-' || (flags & FLAG_LONGONLY))) {
 478                 short_too = 0;
 479 #ifdef GNU_COMPATIBLE
 480                 dash_prefix = D_PREFIX;
 481 #endif
 482                 if (*place == '-') {
 483                         place++;                /* --foo long option */
 484 #ifdef GNU_COMPATIBLE
 485                         dash_prefix = DD_PREFIX;
 486 #endif
 487                 } else if (*place != ':' && strchr(options, *place) != NULL)
 488                         short_too = 1;          /* could be short option too */
 489
 490                 optchar = parse_long_options(nargv, options, long_options,
 491                     idx, short_too, flags);
 492                 if (optchar != -1) {
 493                         place = EMSG;
 494                         return (optchar);
 495                 }
 496         }
 497
 498         if ((optchar = (int)*place++) == (int)':' ||
 499             (optchar == (int)'-' && *place != '\0') ||
 500             (oli = strchr(options, optchar)) == NULL) {
 501                 /*
 502                  * If the user specified "-" and  '-' isn't listed in
 503                  * options, return -1 (non-option) as per POSIX.
 504                  * Otherwise, it is an unknown option character (or ':').
 505                  */
 506                 if (optchar == (int)'-' && *place == '\0')
 507                         return (-1);
 508                 if (!*place)
 509                         ++optind;
 510 #ifdef GNU_COMPATIBLE
 511                 if (PRINT_ERROR)
 512                         warnx(posixly_correct ? illoptchar : gnuoptchar,
 513                               optchar);
 514 #else
 515                 if (PRINT_ERROR)
 516                         warnx(illoptchar, optchar);
 517 #endif
 518                 optopt = optchar;
 519                 return (BADCH);
 520         }
 521         if (long_options != NULL && optchar == 'W' && oli[1] == ';') {
 522                 /* -W long-option */
 523                 if (*place)                     /* no space */
 524                         /* NOTHING */;
 525                 else if (++optind >= nargc) {   /* no arg */
 526                         place = EMSG;
 527                         if (PRINT_ERROR)
 528                                 warnx(recargchar, optchar);
 529                         optopt = optchar;
 530                         return (BADARG);
 531                 } else                          /* white space */
 532                         place = nargv[optind];
 533 #ifdef GNU_COMPATIBLE
 534                 dash_prefix = W_PREFIX;
 535 #endif
 536                 optchar = parse_long_options(nargv, options, long_options,
 537                     idx, 0, flags);
 538                 place = EMSG;
 539                 return (optchar);
 540         }
 541         if (*++oli != ':') {                    /* doesn't take argument */
 542                 if (!*place)
 543                         ++optind;
 544         } else {                                /* takes (optional) argument */
 545                 optarg = NULL;
 546                 if (*place)                     /* no white space */
 547                         optarg = (char *)place;
 548                 else if (oli[1] != ':') {       /* arg not optional */
 549                         if (++optind >= nargc) {        /* no arg */
 550                                 place = EMSG;
 551                                 if (PRINT_ERROR)
 552                                         warnx(recargchar, optchar);
 553                                 optopt = optchar;
 554                                 return (BADARG);
 555                         } else
 556                                 optarg = nargv[optind];
 557                 }
 558                 place = EMSG;
 559                 ++optind;
 560         }
 561         /* dump back option letter */
 562         return (optchar);
 563 }
 564
 565 #ifdef REPLACE_GETOPT
 566 /*
 567  * getopt --
 568  *      Parse argc/argv argument vector.
 569  *
 570  * [eventually this will replace the BSD getopt]
 571  */
 572 int
 573 getopt(int nargc, char * const *nargv, const char *options)
 574 {
 575
 576         /*
 577          * We don't pass FLAG_PERMUTE to getopt_internal() since
 578          * the BSD getopt(3) (unlike GNU) has never done this.
 579          *
 580          * Furthermore, since many privileged programs call getopt()
 581          * before dropping privileges it makes sense to keep things
 582          * as simple (and bug-free) as possible.
 583          */
 584         return (getopt_internal(nargc, nargv, options, NULL, NULL, 0));
 585 }
 586 #endif /* REPLACE_GETOPT */
 587
 588 /*
 589  * getopt_long --
 590  *      Parse argc/argv argument vector.
 591  */
 592 int
 593 getopt_long(int nargc, char * const *nargv, const char *options,
 594         const struct option *long_options, int *idx)
 595 {
 596
 597         return (getopt_internal(nargc, nargv, options, long_options, idx,
 598             FLAG_PERMUTE));
 599 }
 600
 601 /*
 602  * getopt_long_only --
 603  *      Parse argc/argv argument vector.
 604  */
 605 int
 606 getopt_long_only(int nargc, char * const *nargv, const char *options,
 607         const struct option *long_options, int *idx)
 608 {
 609
 610         return (getopt_internal(nargc, nargv, options, long_options, idx,
 611             FLAG_PERMUTE|FLAG_LONGONLY));
 612 }