granicus.if.org Git - postgresql/blob - 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[0] && place[0] == '-' && place[1] == '\0')
  83                 {                                               /* found "--" */
  84                         ++optind;
  85                         place = EMSG;
  86                         return -1;
  87                 }
  88
  89                 if (place[0] && place[0] == '-' && place[1])
  90                 {
  91                         /* long option */
  92                         size_t          namelen;
  93                         int                     i;
  94
  95                         place++;
  96
  97                         namelen = strcspn(place, "=");
  98                         for (i = 0; longopts[i].name != NULL; i++)
  99                         {
 100                                 if (strlen(longopts[i].name) == namelen
 101                                         && strncmp(place, longopts[i].name, namelen) == 0)
 102                                 {
 103                                         int                     has_arg = longopts[i].has_arg;
 104
 105                                         if (has_arg != no_argument)
 106                                         {
 107                                                 if (place[namelen] == '=')
 108                                                         optarg = place + namelen + 1;
 109                                                 else if (optind < argc - 1 &&
 110                                                                  has_arg == required_argument)
 111                                                 {
 112                                                         optind++;
 113                                                         optarg = argv[optind];
 114                                                 }
 115                                                 else
 116                                                 {
 117                                                         if (optstring[0] == ':')
 118                                                                 return BADARG;
 119
 120                                                         if (opterr && has_arg == required_argument)
 121                                                                 fprintf(stderr,
 122                                                                    "%s: option requires an argument -- %s\n",
 123                                                                                 argv[0], place);
 124
 125                                                         place = EMSG;
 126                                                         optind++;
 127
 128                                                         if (has_arg == required_argument)
 129                                                                 return BADCH;
 130                                                         optarg = NULL;
 131                                                 }
 132                                         }
 133                                         else
 134                                         {
 135                                                 optarg = NULL;
 136                                                 if (place[namelen] != 0)
 137                                                 {
 138                                                         /* XXX error? */
 139                                                 }
 140                                         }
 141
 142                                         optind++;
 143
 144                                         if (longindex)
 145                                                 *longindex = i;
 146
 147                                         place = EMSG;
 148
 149                                         if (longopts[i].flag == NULL)
 150                                                 return longopts[i].val;
 151                                         else
 152                                         {
 153                                                 *longopts[i].flag = longopts[i].val;
 154                                                 return 0;
 155                                         }
 156                                 }
 157                         }
 158
 159                         if (opterr && optstring[0] != ':')
 160                                 fprintf(stderr,
 161                                                 "%s: illegal option -- %s\n", argv[0], place);
 162                         place = EMSG;
 163                         optind++;
 164                         return BADCH;
 165                 }
 166         }
 167
 168         /* short option */
 169         optopt = (int) *place++;
 170
 171         oli = strchr(optstring, optopt);
 172         if (!oli)
 173         {
 174                 if (!*place)
 175                         ++optind;
 176                 if (opterr && *optstring != ':')
 177                         fprintf(stderr,
 178                                         "%s: illegal option -- %c\n", argv[0], optopt);
 179                 return BADCH;
 180         }
 181
 182         if (oli[1] != ':')
 183         {                                                       /* don't need argument */
 184                 optarg = NULL;
 185                 if (!*place)
 186                         ++optind;
 187         }
 188         else
 189         {                                                       /* need an argument */
 190                 if (*place)                             /* no white space */
 191                         optarg = place;
 192                 else if (argc <= ++optind)
 193                 {                                               /* no arg */
 194                         place = EMSG;
 195                         if (*optstring == ':')
 196                                 return BADARG;
 197                         if (opterr)
 198                                 fprintf(stderr,
 199                                                 "%s: option requires an argument -- %c\n",
 200                                                 argv[0], optopt);
 201                         return BADCH;
 202                 }
 203                 else
 204                         /* white space */
 205                         optarg = argv[optind];
 206                 place = EMSG;
 207                 ++optind;
 208         }
 209         return optopt;
 210 }