src/port/getopt_long.c

   1 /*
   2  * getopt_long() -- long options parser
   3  *
   4  * Portions Copyright (c) 1987, 1993, 1994
   5  * The Regents of the University of California.  All rights reserved.
   6  *
   7  * Portions Copyright (c) 2003
   8  * PostgreSQL Global Development Group
   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  * 3. Neither the name of the University nor the names of its contributors
  19  *        may be used to endorse or promote products derived from this software
  20  *        without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * src/port/getopt_long.c
  35  */
  36
  37 #include "c.h"
  38
  39 #include "getopt_long.h"
  40
  41 #define BADCH   '?'
  42 #define BADARG  ':'
  43 #define EMSG    ""
  44
  45
  46 /*
  47  * getopt_long
  48  *      Parse argc/argv argument vector, with long options.
  49  *
  50  * This implementation does not use optreset.  Instead, we guarantee that
  51  * it can be restarted on a new argv array after a previous call returned -1,
  52  * if the caller resets optind to 1 before the first call of the new series.
  53  * (Internally, this means we must be sure to reset "place" to EMSG before
  54  * returning -1.)
  55  */
  56 int
  57 getopt_long(int argc, char *const argv[],
  58                         const char *optstring,
  59                         const struct option *longopts, int *longindex)
  60 {
  61         static char *place = EMSG;      /* option letter processing */
  62         char       *oli;                        /* option letter list index */
  63
  64         if (!*place)
  65         {                                                       /* update scanning pointer */
  66                 if (optind >= argc)
  67                 {
  68                         place = EMSG;
  69                         return -1;
  70                 }
  71
  72                 place = argv[optind];
  73
  74                 if (place[0] != '-')
  75                 {
  76                         place = EMSG;
  77                         return -1;
  78                 }
  79
  80                 place++;
  81
  82                 if (!*place)
  83                 {
  84                         /* treat "-" as not being an option */
  85                         place = EMSG;
  86                         return -1;
  87                 }
  88
  89                 if (place[0] == '-' && place[1] == '\0')
  90                 {
  91                         /* found "--", treat it as end of options */
  92                         ++optind;
  93                         place = EMSG;
  94                         return -1;
  95                 }
  96
  97                 if (place[0] == '-' && place[1])
  98                 {
  99                         /* long option */
 100                         size_t          namelen;
 101                         int                     i;
 102
 103                         place++;
 104
 105                         namelen = strcspn(place, "=");
 106                         for (i = 0; longopts[i].name != NULL; i++)
 107                         {
 108                                 if (strlen(longopts[i].name) == namelen
 109                                         && strncmp(place, longopts[i].name, namelen) == 0)
 110                                 {
 111                                         int                     has_arg = longopts[i].has_arg;
 112
 113                                         if (has_arg != no_argument)
 114                                         {
 115                                                 if (place[namelen] == '=')
 116                                                         optarg = place + namelen + 1;
 117                                                 else if (optind < argc - 1 &&
 118                                                                  has_arg == required_argument)
 119                                                 {
 120                                                         optind++;
 121                                                         optarg = argv[optind];
 122                                                 }
 123                                                 else
 124                                                 {
 125                                                         if (optstring[0] == ':')
 126                                                                 return BADARG;
 127
 128                                                         if (opterr && has_arg == required_argument)
 129                                                                 fprintf(stderr,
 130                                                                                 "%s: option requires an argument -- %s\n",
 131                                                                                 argv[0], place);
 132
 133                                                         place = EMSG;
 134                                                         optind++;
 135
 136                                                         if (has_arg == required_argument)
 137                                                                 return BADCH;
 138                                                         optarg = NULL;
 139                                                 }
 140                                         }
 141                                         else
 142                                         {
 143                                                 optarg = NULL;
 144                                                 if (place[namelen] != 0)
 145                                                 {
 146                                                         /* XXX error? */
 147                                                 }
 148                                         }
 149
 150                                         optind++;
 151
 152                                         if (longindex)
 153                                                 *longindex = i;
 154
 155                                         place = EMSG;
 156
 157                                         if (longopts[i].flag == NULL)
 158                                                 return longopts[i].val;
 159                                         else
 160                                         {
 161                                                 *longopts[i].flag = longopts[i].val;
 162                                                 return 0;
 163                                         }
 164                                 }
 165                         }
 166
 167                         if (opterr && optstring[0] != ':')
 168                                 fprintf(stderr,
 169                                                 "%s: illegal option -- %s\n", argv[0], place);
 170                         place = EMSG;
 171                         optind++;
 172                         return BADCH;
 173                 }
 174         }
 175
 176         /* short option */
 177         optopt = (int) *place++;
 178
 179         oli = strchr(optstring, optopt);
 180         if (!oli)
 181         {
 182                 if (!*place)
 183                         ++optind;
 184                 if (opterr && *optstring != ':')
 185                         fprintf(stderr,
 186                                         "%s: illegal option -- %c\n", argv[0], optopt);
 187                 return BADCH;
 188         }
 189
 190         if (oli[1] != ':')
 191         {                                                       /* don't need argument */
 192                 optarg = NULL;
 193                 if (!*place)
 194                         ++optind;
 195         }
 196         else
 197         {                                                       /* need an argument */
 198                 if (*place)                             /* no white space */
 199                         optarg = place;
 200                 else if (argc <= ++optind)
 201                 {                                               /* no arg */
 202                         place = EMSG;
 203                         if (*optstring == ':')
 204                                 return BADARG;
 205                         if (opterr)
 206                                 fprintf(stderr,
 207                                                 "%s: option requires an argument -- %c\n",
 208                                                 argv[0], optopt);
 209                         return BADCH;
 210                 }
 211                 else
 212                         /* white space */
 213                         optarg = argv[optind];
 214                 place = EMSG;
 215                 ++optind;
 216         }
 217         return optopt;
 218 }