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  * $PostgreSQL$
  35  */
  36
  37 #include "c.h"
  38
  39 #include "getopt_long.h"
  40
  41 #ifndef HAVE_INT_OPTRESET
  42 int                     optreset;
  43
  44 /* else the "extern" was provided by getopt_long.h */
  45 #endif
  46
  47 #define BADCH   '?'
  48 #define BADARG  ':'
  49 #define EMSG    ""
  50
  51
  52 int
  53 getopt_long(int argc, char *const argv[],
  54                         const char *optstring,
  55                         const struct option * longopts, int *longindex)
  56 {
  57         static char *place = EMSG;      /* option letter processing */
  58         char       *oli;                        /* option letter list index */
  59
  60         if (optreset || !*place)
  61         {                                                       /* update scanning pointer */
  62                 optreset = 0;
  63
  64                 if (optind >= argc)
  65                 {
  66                         place = EMSG;
  67                         return -1;
  68                 }
  69
  70                 place = argv[optind];
  71
  72                 if (place[0] != '-')
  73                 {
  74                         place = EMSG;
  75                         return -1;
  76                 }
  77
  78                 place++;
  79
  80                 if (place[0] && place[0] == '-' && place[1] == '\0')
  81                 {                                               /* found "--" */
  82                         ++optind;
  83                         place = EMSG;
  84                         return -1;
  85                 }
  86
  87                 if (place[0] && place[0] == '-' && place[1])
  88                 {
  89                         /* long option */
  90                         size_t          namelen;
  91                         int                     i;
  92
  93                         place++;
  94
  95                         namelen = strcspn(place, "=");
  96                         for (i = 0; longopts[i].name != NULL; i++)
  97                         {
  98                                 if (strlen(longopts[i].name) == namelen
  99                                         && strncmp(place, longopts[i].name, namelen) == 0)
 100                                 {
 101                                         if (longopts[i].has_arg)
 102                                         {
 103                                                 if (place[namelen] == '=')
 104                                                         optarg = place + namelen + 1;
 105                                                 else if (optind < argc - 1)
 106                                                 {
 107                                                         optind++;
 108                                                         optarg = argv[optind];
 109                                                 }
 110                                                 else
 111                                                 {
 112                                                         if (optstring[0] == ':')
 113                                                                 return BADARG;
 114                                                         if (opterr)
 115                                                                 fprintf(stderr,
 116                                                                    "%s: option requires an argument -- %s\n",
 117                                                                                 argv[0], place);
 118                                                         place = EMSG;
 119                                                         optind++;
 120                                                         return BADCH;
 121                                                 }
 122                                         }
 123                                         else
 124                                         {
 125                                                 optarg = NULL;
 126                                                 if (place[namelen] != 0)
 127                                                 {
 128                                                         /* XXX error? */
 129                                                 }
 130                                         }
 131
 132                                         optind++;
 133
 134                                         if (longindex)
 135                                                 *longindex = i;
 136
 137                                         place = EMSG;
 138
 139                                         if (longopts[i].flag == NULL)
 140                                                 return longopts[i].val;
 141                                         else
 142                                         {
 143                                                 *longopts[i].flag = longopts[i].val;
 144                                                 return 0;
 145                                         }
 146                                 }
 147                         }
 148
 149                         if (opterr && optstring[0] != ':')
 150                                 fprintf(stderr,
 151                                                 "%s: illegal option -- %s\n", argv[0], place);
 152                         place = EMSG;
 153                         optind++;
 154                         return BADCH;
 155                 }
 156         }
 157
 158         /* short option */
 159         optopt = (int) *place++;
 160
 161         oli = strchr(optstring, optopt);
 162         if (!oli)
 163         {
 164                 if (!*place)
 165                         ++optind;
 166                 if (opterr && *optstring != ':')
 167                         fprintf(stderr,
 168                                         "%s: illegal option -- %c\n", argv[0], optopt);
 169                 return BADCH;
 170         }
 171
 172         if (oli[1] != ':')
 173         {                                                       /* don't need argument */
 174                 optarg = NULL;
 175                 if (!*place)
 176                         ++optind;
 177         }
 178         else
 179         {                                                       /* need an argument */
 180                 if (*place)                             /* no white space */
 181                         optarg = place;
 182                 else if (argc <= ++optind)
 183                 {                                               /* no arg */
 184                         place = EMSG;
 185                         if (*optstring == ':')
 186                                 return BADARG;
 187                         if (opterr)
 188                                 fprintf(stderr,
 189                                                 "%s: option requires an argument -- %c\n",
 190                                                 argv[0], optopt);
 191                         return BADCH;
 192                 }
 193                 else
 194                         /* white space */
 195                         optarg = argv[optind];
 196                 place = EMSG;
 197                 ++optind;
 198         }
 199         return optopt;
 200 }