src/port/getopt.c

   1 /* $PostgreSQL$ */
   2
   3 /* This is used by psql under Win32 */
   4
   5 /*
   6  * Copyright (c) 1987, 1993, 1994
   7  *      The Regents of the University of California.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *        notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *        notice, this list of conditions and the following disclaimer in the
  16  *        documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *        may be used to endorse or promote products derived from this software
  19  *        without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.      IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  */
  32
  33 #include "c.h"
  34
  35 #if defined(LIBC_SCCS) && !defined(lint)
  36 static char sccsid[] = "@(#)getopt.c    8.3 (Berkeley) 4/27/95";
  37 #endif   /* LIBC_SCCS and not lint */
  38
  39
  40 /*
  41  * On some versions of Solaris, opterr and friends are defined in core libc
  42  * rather than in a separate getopt module.  Define these variables only
  43  * if configure found they aren't there by default.  (We assume that testing
  44  * opterr is sufficient for all of these except optreset.)
  45  */
  46 #ifndef HAVE_INT_OPTERR
  47
  48 int                     opterr = 1,                     /* if error message should be printed */
  49                         optind = 1,                     /* index into parent argv vector */
  50                         optopt;                         /* character checked for validity */
  51 char       *optarg;                             /* argument associated with option */
  52 #else
  53
  54 extern int      opterr;
  55 extern int      optind;
  56 extern int      optopt;
  57 extern char *optarg;
  58 #endif
  59
  60 #ifndef HAVE_INT_OPTRESET
  61 int                     optreset;                       /* reset getopt */
  62 #else
  63 extern int      optreset;
  64 #endif
  65
  66 #define BADCH   (int)'?'
  67 #define BADARG  (int)':'
  68 #define EMSG    ""
  69
  70 /*
  71  * getopt
  72  *      Parse argc/argv argument vector.
  73  */
  74 int
  75 getopt(nargc, nargv, ostr)
  76 int                     nargc;
  77 char       *const * nargv;
  78 const char *ostr;
  79 {
  80         static char *place = EMSG;      /* option letter processing */
  81         char       *oli;                        /* option letter list index */
  82
  83         if (optreset || !*place)
  84         {                                                       /* update scanning pointer */
  85                 optreset = 0;
  86                 if (optind >= nargc || *(place = nargv[optind]) != '-')
  87                 {
  88                         place = EMSG;
  89                         return -1;
  90                 }
  91                 if (place[1] && *++place == '-' && place[1] == '\0')
  92                 {                                               /* found "--" */
  93                         ++optind;
  94                         place = EMSG;
  95                         return -1;
  96                 }
  97         }                                                       /* option letter okay? */
  98         if ((optopt = (int) *place++) == (int) ':' ||
  99                 !(oli = strchr(ostr, optopt)))
 100         {
 101                 /*
 102                  * if the user didn't specify '-' as an option, assume it means -1.
 103                  */
 104                 if (optopt == (int) '-')
 105                         return -1;
 106                 if (!*place)
 107                         ++optind;
 108                 if (opterr && *ostr != ':')
 109                         (void) fprintf(stderr,
 110                                                    "illegal option -- %c\n", optopt);
 111                 return BADCH;
 112         }
 113         if (*++oli != ':')
 114         {                                                       /* don't need argument */
 115                 optarg = NULL;
 116                 if (!*place)
 117                         ++optind;
 118         }
 119         else
 120         {                                                       /* need an argument */
 121                 if (*place)                             /* no white space */
 122                         optarg = place;
 123                 else if (nargc <= ++optind)
 124                 {                                               /* no arg */
 125                         place = EMSG;
 126                         if (*ostr == ':')
 127                                 return BADARG;
 128                         if (opterr)
 129                                 (void) fprintf(stderr,
 130                                                            "option requires an argument -- %c\n",
 131                                                            optopt);
 132                         return BADCH;
 133                 }
 134                 else
 135                         /* white space */
 136                         optarg = nargv[optind];
 137                 place = EMSG;
 138                 ++optind;
 139         }
 140         return optopt;                          /* dump back option letter */
 141 }