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
  40 int     opterr = 1,             /* if error message should be printed */
  41         optind = 1,             /* index into parent argv vector */
  42         optopt,                 /* character checked for validity */
  43         optreset;               /* reset getopt */
  44 char    *optarg;                /* argument associated with option */
  45
  46 #define BADCH   (int)'?'
  47 #define BADARG  (int)':'
  48 #define EMSG    ""
  49
  50 /*
  51  * getopt --
  52  *      Parse argc/argv argument vector.
  53  */
  54 int
  55 getopt(int argc, char * const argv[], const char *optstring)
  56 {
  57         static char *place = EMSG;              /* option letter processing */
  58         char *oli;                              /* option letter list index */
  59
  60         if (optreset || *place == 0) {          /* update scanning pointer */
  61                 optreset = 0;
  62                 place = argv[optind];
  63                 if (optind >= argc || *place++ != '-') {
  64                         /* Argument is absent or is not an option */
  65                         place = EMSG;
  66                         return (-1);
  67                 }
  68                 optopt = *place++;
  69                 if (optopt == '-' && *place == 0) {
  70                         /* "--" => end of options */
  71                         ++optind;
  72                         place = EMSG;
  73                         return (-1);
  74                 }
  75                 if (optopt == 0) {
  76                         /* Solitary '-', treat as a '-' option
  77                            if the program (eg su) is looking for it. */
  78                         place = EMSG;
  79                         if (strchr(optstring, '-') == NULL)
  80                                 return -1;
  81                         optopt = '-';
  82                 }
  83         } else
  84                 optopt = *place++;
  85
  86         /* See if option letter is one the caller wanted... */
  87         if (optopt == ':' || (oli = strchr(optstring, optopt)) == NULL) {
  88                 if (*place == 0)
  89                         ++optind;
  90                 if (opterr && *optstring != ':')
  91                         (void)fprintf(stderr,
  92                                       "unknown option -- %c\n", optopt);
  93                 return (BADCH);
  94         }
  95
  96         /* Does this option need an argument? */
  97         if (oli[1] != ':') {
  98                 /* don't need argument */
  99                 optarg = NULL;
 100                 if (*place == 0)
 101                         ++optind;
 102         } else {
 103                 /* Option-argument is either the rest of this argument or the
 104                    entire next argument. */
 105                 if (*place)
 106                         optarg = place;
 107                 else if (argc > ++optind)
 108                         optarg = argv[optind];
 109                 else {
 110                         /* option-argument absent */
 111                         place = EMSG;
 112                         if (*optstring == ':')
 113                                 return (BADARG);
 114                         if (opterr)
 115                                 (void)fprintf(stderr,
 116                                         "option requires an argument -- %c\n",
 117                                         optopt);
 118                         return (BADCH);
 119                 }
 120                 place = EMSG;
 121                 ++optind;
 122         }
 123         return (optopt);                        /* return option letter */
 124 }