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