payloads/libpayload/libc/getopt_long.c

   1 /*      $OpenBSD: getopt_long.c,v 1.23 2007/10/31 12:34:57 chl 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  * Copyright (c) 2008 coresystems GmbH
   7  *
   8  * Permission to use, copy, modify, and distribute this software for any
   9  * purpose with or without fee is hereby granted, provided that the above
  10  * copyright notice and this permission notice appear in all copies.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  13  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  14  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  15  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  16  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  17  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  18  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  19  *
  20  * Sponsored in part by the Defense Advanced Research Projects
  21  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  22  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
  23  */
  24 /*-
  25  * Copyright (c) 2000 The NetBSD Foundation, Inc.
  26  * All rights reserved.
  27  *
  28  * This code is derived from software contributed to The NetBSD Foundation
  29  * by Dieter Baron and Thomas Klausner.
  30  *
  31  * Redistribution and use in source and binary forms, with or without
  32  * modification, are permitted provided that the following conditions
  33  * are met:
  34  * 1. Redistributions of source code must retain the above copyright
  35  *    notice, this list of conditions and the following disclaimer.
  36  * 2. Redistributions in binary form must reproduce the above copyright
  37  *    notice, this list of conditions and the following disclaimer in the
  38  *    documentation and/or other materials provided with the distribution.
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  41  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  42  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  44  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  45  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  46  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  47  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  48  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  50  * POSSIBILITY OF SUCH DAMAGE.
  51  */
  52
  53 /*
  54 #include <err.h>
  55 #include <errno.h>
  56 */
  57 #include <libpayload.h>
  58 #include <getopt.h>
  59 #define warnx(x...) printf(x)
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #define REPLACE_GETOPT          /* use this getopt as the system getopt(3) */
  63
  64 #ifdef REPLACE_GETOPT
  65 int     opterr = 1;             /* if error message should be printed */
  66 int     optind = 1;             /* index into parent argv vector */
  67 int     optopt = '?';           /* character checked for validity */
  68 int     optreset;               /* reset getopt */
  69 char    *optarg;                /* argument associated with option */
  70
  71 int posixly_correct = 0;
  72 #endif
  73
  74 #define PRINT_ERROR     ((opterr) && (*options != ':'))
  75
  76 #define FLAG_PERMUTE    0x01    /* permute non-options to the end of argv */
  77 #define FLAG_ALLARGS    0x02    /* treat non-options as args to option "-1" */
  78 #define FLAG_LONGONLY   0x04    /* operate as getopt_long_only */
  79
  80 /* return values */
  81 #define BADCH           (int)'?'
  82 #define BADARG          ((*options == ':') ? (int)':' : (int)'?')
  83 #define INORDER         (int)1
  84
  85 #define EMSG            (char*)""
  86
  87 static int getopt_internal(int, char * const *, const char *,
  88                            const struct option *, int *, int);
  89 static int parse_long_options(char * const *, const char *,
  90                               const struct option *, int *, int);
  91 static int gcd(int, int);
  92 static void permute_args(int, int, int, char * const *);
  93
  94 static char *place = EMSG; /* option letter processing */
  95
  96 /* XXX: set optreset to 1 rather than these two */
  97 static int nonopt_start = -1; /* first non option argument (for permute) */
  98 static int nonopt_end = -1;   /* first option after non options (for permute) */
  99
 100 /* Error messages */
 101 static const char recargchar[] = "option requires an argument -- %c";
 102 static const char recargstring[] = "option requires an argument -- %s";
 103 static const char ambig[] = "ambiguous option -- %.*s";
 104 static const char noarg[] = "option doesn't take an argument -- %.*s";
 105 static const char illoptchar[] = "unknown option -- %c";
 106 static const char illoptstring[] = "unknown option -- %s";
 107
 108 /*
 109  * Compute the greatest common divisor of a and b.
 110  */
 111 static int
 112 gcd(int a, int b)
 113 {
 114         int c;
 115
 116         c = a % b;
 117         while (c != 0) {
 118                 a = b;
 119                 b = c;
 120                 c = a % b;
 121         }
 122
 123         return (b);
 124 }
 125
 126 /*
 127  * Exchange the block from nonopt_start to nonopt_end with the block
 128  * from nonopt_end to opt_end (keeping the same order of arguments
 129  * in each block).
 130  */
 131 static void
 132 permute_args(int panonopt_start, int panonopt_end, int opt_end,
 133         char * const *nargv)
 134 {
 135         int cstart, cyclelen, i, j, ncycle, nnonopts, nopts, pos;
 136         char *swap;
 137
 138         /*
 139          * compute lengths of blocks and number and size of cycles
 140          */
 141         nnonopts = panonopt_end - panonopt_start;
 142         nopts = opt_end - panonopt_end;
 143         ncycle = gcd(nnonopts, nopts);
 144         cyclelen = (opt_end - panonopt_start) / ncycle;
 145
 146         for (i = 0; i < ncycle; i++) {
 147                 cstart = panonopt_end+i;
 148                 pos = cstart;
 149                 for (j = 0; j < cyclelen; j++) {
 150                         if (pos >= panonopt_end)
 151                                 pos -= nnonopts;
 152                         else
 153                                 pos += nopts;
 154                         swap = nargv[pos];
 155                         /* LINTED const cast */
 156                         ((char **) nargv)[pos] = nargv[cstart];
 157                         /* LINTED const cast */
 158                         ((char **)nargv)[cstart] = swap;
 159                 }
 160         }
 161 }
 162
 163 /*
 164  * parse_long_options --
 165  *      Parse long options in argc/argv argument vector.
 166  * Returns -1 if short_too is set and the option does not match long_options.
 167  */
 168 static int
 169 parse_long_options(char * const *nargv, const char *options,
 170         const struct option *long_options, int *idx, int short_too)
 171 {
 172         char *current_argv, *has_equal;
 173         size_t current_argv_len;
 174         int i, match;
 175
 176         current_argv = place;
 177         match = -1;
 178
 179         optind++;
 180
 181         if ((has_equal = strchr(current_argv, '=')) != NULL) {
 182                 /* argument found (--option=arg) */
 183                 current_argv_len = has_equal - current_argv;
 184                 has_equal++;
 185         } else
 186                 current_argv_len = strlen(current_argv);
 187
 188         for (i = 0; long_options[i].name; i++) {
 189                 /* find matching long option */
 190                 if (strncmp(current_argv, long_options[i].name,
 191                     current_argv_len))
 192                         continue;
 193
 194                 if (strlen(long_options[i].name) == current_argv_len) {
 195                         /* exact match */
 196                         match = i;
 197                         break;
 198                 }
 199                 /*
 200                  * If this is a known short option, don't allow
 201                  * a partial match of a single character.
 202                  */
 203                 if (short_too && current_argv_len == 1)
 204                         continue;
 205
 206                 if (match == -1)        /* partial match */
 207                         match = i;
 208                 else {
 209                         /* ambiguous abbreviation */
 210                         if (PRINT_ERROR)
 211                                 warnx(ambig, (int)current_argv_len,
 212                                      current_argv);
 213                         optopt = 0;
 214                         return (BADCH);
 215                 }
 216         }
 217         if (match != -1) {              /* option found */
 218                 if (long_options[match].has_arg == no_argument
 219                     && has_equal) {
 220                         if (PRINT_ERROR)
 221                                 warnx(noarg, (int)current_argv_len,
 222                                      current_argv);
 223                         /*
 224                          * XXX: GNU sets optopt to val regardless of flag
 225                          */
 226                         if (long_options[match].flag == NULL)
 227                                 optopt = long_options[match].val;
 228                         else
 229                                 optopt = 0;
 230                         return (BADARG);
 231                 }
 232                 if (long_options[match].has_arg == required_argument ||
 233                     long_options[match].has_arg == optional_argument) {
 234                         if (has_equal)
 235                                 optarg = has_equal;
 236                         else if (long_options[match].has_arg ==
 237                             required_argument) {
 238                                 /*
 239                                  * optional argument doesn't use next nargv
 240                                  */
 241                                 optarg = nargv[optind++];
 242                         }
 243                 }
 244                 if ((long_options[match].has_arg == required_argument)
 245                     && (optarg == NULL)) {
 246                         /*
 247                          * Missing argument; leading ':' indicates no error
 248                          * should be generated.
 249                          */
 250                         if (PRINT_ERROR)
 251                                 warnx(recargstring,
 252                                     current_argv);
 253                         /*
 254                          * XXX: GNU sets optopt to val regardless of flag
 255                          */
 256                         if (long_options[match].flag == NULL)
 257                                 optopt = long_options[match].val;
 258                         else
 259                                 optopt = 0;
 260                         --optind;
 261                         return (BADARG);
 262                 }
 263         } else {                        /* unknown option */
 264                 if (short_too) {
 265                         --optind;
 266                         return (-1);
 267                 }
 268                 if (PRINT_ERROR)
 269                         warnx(illoptstring, current_argv);
 270                 optopt = 0;
 271                 return (BADCH);
 272         }
 273         if (idx)
 274                 *idx = match;
 275         if (long_options[match].flag) {
 276                 *long_options[match].flag = long_options[match].val;
 277                 return (0);
 278         } else
 279                 return (long_options[match].val);
 280 }
 281
 282 /*
 283  * getopt_internal --
 284  *      Parse argc/argv argument vector.  Called by user level routines.
 285  */
 286 static int
 287 getopt_internal(int nargc, char * const *nargv, const char *options,
 288         const struct option *long_options, int *idx, int flags)
 289 {
 290         char *oli;                              /* option letter list index */
 291         int optchar, short_too;
 292
 293         if (options == NULL)
 294                 return (-1);
 295
 296         /*
 297          * Disable GNU extensions if posixly_correct is set or options
 298          * string begins with a '+'.
 299          */
 300         if (posixly_correct || *options == '+')
 301                 flags &= ~FLAG_PERMUTE;
 302         else if (*options == '-')
 303                 flags |= FLAG_ALLARGS;
 304         if (*options == '+' || *options == '-')
 305                 options++;
 306
 307         /*
 308          * XXX Some GNU programs (like cvs) set optind to 0 instead of
 309          * XXX using optreset.  Work around this braindamage.
 310          */
 311         if (optind == 0)
 312                 optind = optreset = 1;
 313
 314         optarg = NULL;
 315         if (optreset)
 316                 nonopt_start = nonopt_end = -1;
 317 start:
 318         if (optreset || !*place) {              /* update scanning pointer */
 319                 optreset = 0;
 320                 if (optind >= nargc) {          /* end of argument vector */
 321                         place = EMSG;
 322                         if (nonopt_end != -1) {
 323                                 /* do permutation, if we have to */
 324                                 permute_args(nonopt_start, nonopt_end,
 325                                     optind, nargv);
 326                                 optind -= nonopt_end - nonopt_start;
 327                         }
 328                         else if (nonopt_start != -1) {
 329                                 /*
 330                                  * If we skipped non-options, set optind
 331                                  * to the first of them.
 332                                  */
 333                                 optind = nonopt_start;
 334                         }
 335                         nonopt_start = nonopt_end = -1;
 336                         return (-1);
 337                 }
 338                 if (*(place = nargv[optind]) != '-' ||
 339                     (place[1] == '\0' && strchr(options, '-') == NULL)) {
 340                         place = EMSG;           /* found non-option */
 341                         if (flags & FLAG_ALLARGS) {
 342                                 /*
 343                                  * GNU extension:
 344                                  * return non-option as argument to option 1
 345                                  */
 346                                 optarg = nargv[optind++];
 347                                 return (INORDER);
 348                         }
 349                         if (!(flags & FLAG_PERMUTE)) {
 350                                 /*
 351                                  * If no permutation wanted, stop parsing
 352                                  * at first non-option.
 353                                  */
 354                                 return (-1);
 355                         }
 356                         /* do permutation */
 357                         if (nonopt_start == -1)
 358                                 nonopt_start = optind;
 359                         else if (nonopt_end != -1) {
 360                                 permute_args(nonopt_start, nonopt_end,
 361                                     optind, nargv);
 362                                 nonopt_start = optind -
 363                                     (nonopt_end - nonopt_start);
 364                                 nonopt_end = -1;
 365                         }
 366                         optind++;
 367                         /* process next argument */
 368                         goto start;
 369                 }
 370                 if (nonopt_start != -1 && nonopt_end == -1)
 371                         nonopt_end = optind;
 372
 373                 /*
 374                  * If we have "-" do nothing, if "--" we are done.
 375                  */
 376                 if (place[1] != '\0' && *++place == '-' && place[1] == '\0') {
 377                         optind++;
 378                         place = EMSG;
 379                         /*
 380                          * We found an option (--), so if we skipped
 381                          * non-options, we have to permute.
 382                          */
 383                         if (nonopt_end != -1) {
 384                                 permute_args(nonopt_start, nonopt_end,
 385                                     optind, nargv);
 386                                 optind -= nonopt_end - nonopt_start;
 387                         }
 388                         nonopt_start = nonopt_end = -1;
 389                         return (-1);
 390                 }
 391         }
 392
 393         /*
 394          * Check long options if:
 395          *  1) we were passed some
 396          *  2) the arg is not just "-"
 397          *  3) either the arg starts with -- we are getopt_long_only()
 398          */
 399         if (long_options != NULL && place != nargv[optind] &&
 400             (*place == '-' || (flags & FLAG_LONGONLY))) {
 401                 short_too = 0;
 402                 if (*place == '-')
 403                         place++;                /* --foo long option */
 404                 else if (*place != ':' && strchr(options, *place) != NULL)
 405                         short_too = 1;          /* could be short option too */
 406
 407                 optchar = parse_long_options(nargv, options, long_options,
 408                     idx, short_too);
 409                 if (optchar != -1) {
 410                         place = EMSG;
 411                         return (optchar);
 412                 }
 413         }
 414
 415         if ((optchar = (int)*place++) == (int)':' ||
 416             (optchar == (int)'-' && *place != '\0') ||
 417             (oli = strchr(options, optchar)) == NULL) {
 418                 /*
 419                  * If the user specified "-" and  '-' isn't listed in
 420                  * options, return -1 (non-option) as per POSIX.
 421                  * Otherwise, it is an unknown option character (or ':').
 422                  */
 423                 if (optchar == (int)'-' && *place == '\0')
 424                         return (-1);
 425                 if (!*place)
 426                         ++optind;
 427                 if (PRINT_ERROR)
 428                         warnx(illoptchar, optchar);
 429                 optopt = optchar;
 430                 return (BADCH);
 431         }
 432         if (long_options != NULL && optchar == 'W' && oli[1] == ';') {
 433                 /* -W long-option */
 434                 if (*place)                     /* no space */
 435                         /* NOTHING */;
 436                 else if (++optind >= nargc) {   /* no arg */
 437                         place = EMSG;
 438                         if (PRINT_ERROR)
 439                                 warnx(recargchar, optchar);
 440                         optopt = optchar;
 441                         return (BADARG);
 442                 } else                          /* white space */
 443                         place = nargv[optind];
 444                 optchar = parse_long_options(nargv, options, long_options,
 445                     idx, 0);
 446                 place = EMSG;
 447                 return (optchar);
 448         }
 449         if (*++oli != ':') {                    /* doesn't take argument */
 450                 if (!*place)
 451                         ++optind;
 452         } else {                                /* takes (optional) argument */
 453                 optarg = NULL;
 454                 if (*place)                     /* no white space */
 455                         optarg = place;
 456                 else if (oli[1] != ':') {       /* arg not optional */
 457                         if (++optind >= nargc) {        /* no arg */
 458                                 place = EMSG;
 459                                 if (PRINT_ERROR)
 460                                         warnx(recargchar, optchar);
 461                                 optopt = optchar;
 462                                 return (BADARG);
 463                         } else
 464                                 optarg = nargv[optind];
 465                 }
 466                 place = EMSG;
 467                 ++optind;
 468         }
 469         /* dump back option letter */
 470         return (optchar);
 471 }
 472
 473 #ifdef REPLACE_GETOPT
 474 /*
 475  * getopt --
 476  *      Parse argc/argv argument vector.
 477  *
 478  * [eventually this will replace the BSD getopt]
 479  */
 480 int
 481 getopt(int nargc, char * const *nargv, const char *options)
 482 {
 483
 484         /*
 485          * We don't pass FLAG_PERMUTE to getopt_internal() since
 486          * the BSD getopt(3) (unlike GNU) has never done this.
 487          *
 488          * Furthermore, since many privileged programs call getopt()
 489          * before dropping privileges it makes sense to keep things
 490          * as simple (and bug-free) as possible.
 491          */
 492         return (getopt_internal(nargc, nargv, options, NULL, NULL, 0));
 493 }
 494 #endif /* REPLACE_GETOPT */
 495
 496 /*
 497  * getopt_long --
 498  *      Parse argc/argv argument vector.
 499  */
 500 int
 501 getopt_long(int nargc, char * const *nargv, const char *options,
 502     const struct option *long_options, int *idx)
 503 {
 504
 505         return (getopt_internal(nargc, nargv, options, long_options, idx,
 506             FLAG_PERMUTE));
 507 }
 508
 509 /*
 510  * getopt_long_only --
 511  *      Parse argc/argv argument vector.
 512  */
 513 int
 514 getopt_long_only(int nargc, char * const *nargv, const char *options,
 515     const struct option *long_options, int *idx)
 516 {
 517
 518         return (getopt_internal(nargc, nargv, options, long_options, idx,
 519             FLAG_PERMUTE|FLAG_LONGONLY));
 520 }