utils/getopt.c

   1 /*      $NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $  */
   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  * 4. 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 defined(LIBC_SCCS) && !defined(lint)
  33 static char sccsid[] = "@(#)getopt.c    8.3 (Berkeley) 4/27/95";
  34 #endif /* LIBC_SCCS and not lint */
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include "getopt.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  * Get program name in Windows
  52  */
  53 const char * _getprogname(void);
  54
  55 /*
  56  * getopt --
  57  *      Parse argc/argv argument vector.
  58  */
  59 int
  60 getopt(int nargc, char * const nargv[], const char *ostr)
  61 {
  62         static char *place = EMSG;              /* option letter processing */
  63         char *oli;                              /* option letter list index */
  64
  65         if (optreset || *place == 0) {          /* update scanning pointer */
  66                 optreset = 0;
  67                 place = nargv[optind];
  68                 if (optind >= nargc || *place++ != '-') {
  69                         /* Argument is absent or is not an option */
  70                         place = EMSG;
  71                         return (-1);
  72                 }
  73                 optopt = *place++;
  74                 if (optopt == '-' && *place == 0) {
  75                         /* "--" => end of options */
  76                         ++optind;
  77                         place = EMSG;
  78                         return (-1);
  79                 }
  80                 if (optopt == 0) {
  81                         /* Solitary '-', treat as a '-' option
  82                            if the program (eg su) is looking for it. */
  83                         place = EMSG;
  84                         if (strchr(ostr, '-') == NULL)
  85                                 return (-1);
  86                         optopt = '-';
  87                 }
  88         } else
  89                 optopt = *place++;
  90
  91         /* See if option letter is one the caller wanted... */
  92         if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
  93                 if (*place == 0)
  94                         ++optind;
  95                 if (opterr && *ostr != ':')
  96                         (void)fprintf(stderr,
  97                             "%s: illegal option -- %c\n", _getprogname(),
  98                             optopt);
  99                 return (BADCH);
 100         }
 101
 102         /* Does this option need an argument? */
 103         if (oli[1] != ':') {
 104                 /* don't need argument */
 105                 optarg = NULL;
 106                 if (*place == 0)
 107                         ++optind;
 108         } else {
 109                 /* Option-argument is either the rest of this argument or the
 110                    entire next argument. */
 111                 if (*place)
 112                         optarg = place;
 113                 else if (nargc > ++optind)
 114                         optarg = nargv[optind];
 115                 else {
 116                         /* option-argument absent */
 117                         place = EMSG;
 118                         if (*ostr == ':')
 119                                 return (BADARG);
 120                         if (opterr)
 121                                 (void)fprintf(stderr,
 122                                     "%s: option requires an argument -- %c\n",
 123                                     _getprogname(), optopt);
 124                         return (BADCH);
 125                 }
 126                 place = EMSG;
 127                 ++optind;
 128         }
 129         return (optopt);                        /* return option letter */
 130 }
 131
 132 const char * _getprogname() {
 133         char *pgmptr = NULL;
 134         _get_pgmptr(&pgmptr);
 135         return strrchr(pgmptr,'\\')+1;
 136 }
 137