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