src/tiff/port/getopt.c

   1 /* $Id$ */
   2
   3 /*
   4  * Copyright (c) 1987, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #if 0
  33 static char sccsid[] = "@(#)getopt.c    8.3 (Berkeley) 4/27/95";
  34 __RCSID("$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $");
  35 #endif
  36
  37 #include <stdio.h>
  38 #include <string.h>
  39 #include "libport.h"
  40
  41 int     opterr = 1,             /* if error message should be printed */
  42         optind = 1,             /* index into parent argv vector */
  43         optopt,                 /* character checked for validity */
  44         optreset;               /* reset getopt */
  45 char    *optarg;                /* argument associated with option */
  46
  47 #define BADCH   (int)'?'
  48 #define BADARG  (int)':'
  49 #define EMSG    ""
  50
  51 /*
  52  * getopt --
  53  *      Parse argc/argv argument vector.
  54  */
  55 int
  56 getopt(int argc, char * const argv[], const char *optstring)
  57 {
  58         static char *place = EMSG;              /* option letter processing */
  59         char *oli;                              /* option letter list index */
  60
  61         if (optreset || *place == 0) {          /* update scanning pointer */
  62                 optreset = 0;
  63                 place = argv[optind];
  64                 if (optind >= argc || *place++ != '-') {
  65                         /* Argument is absent or is not an option */
  66                         place = EMSG;
  67                         return (-1);
  68                 }
  69                 optopt = *place++;
  70                 if (optopt == '-' && *place == 0) {
  71                         /* "--" => end of options */
  72                         ++optind;
  73                         place = EMSG;
  74                         return (-1);
  75                 }
  76                 if (optopt == 0) {
  77                         /* Solitary '-', treat as a '-' option
  78                            if the program (eg su) is looking for it. */
  79                         place = EMSG;
  80                         if (strchr(optstring, '-') == NULL)
  81                                 return -1;
  82                         optopt = '-';
  83                 }
  84         } else
  85                 optopt = *place++;
  86
  87         /* See if option letter is one the caller wanted... */
  88         if (optopt == ':' || (oli = strchr(optstring, optopt)) == NULL) {
  89                 if (*place == 0)
  90                         ++optind;
  91                 if (opterr && *optstring != ':')
  92                         (void)fprintf(stderr,
  93                                       "unknown option -- %c\n", optopt);
  94                 return (BADCH);
  95         }
  96
  97         /* Does this option need an argument? */
  98         if (oli[1] != ':') {
  99                 /* don't need argument */
 100                 optarg = NULL;
 101                 if (*place == 0)
 102                         ++optind;
 103         } else {
 104                 /* Option-argument is either the rest of this argument or the
 105                    entire next argument. */
 106                 if (*place)
 107                         optarg = place;
 108                 else if (argc > ++optind)
 109                         optarg = argv[optind];
 110                 else {
 111                         /* option-argument absent */
 112                         place = EMSG;
 113                         if (*optstring == ':')
 114                                 return (BADARG);
 115                         if (opterr)
 116                                 (void)fprintf(stderr,
 117                                         "option requires an argument -- %c\n",
 118                                         optopt);
 119                         return (BADCH);
 120                 }
 121                 place = EMSG;
 122                 ++optind;
 123         }
 124         return (optopt);                        /* return option letter */
 125 }