crypto/external/bsd/heimdal/dist/lib/roken/getopt.c

   1 /*      $NetBSD: getopt.c,v 1.1.1.1 2011/04/13 18:15:41 elric Exp $     */
   2
   3 /*
   4  * Copyright (c) 1987, 1993
   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 defined(LIBC_SCCS) && !defined(lint)
  33 static char sccsid[] = "@(#)getopt.c    8.1 (Berkeley) 6/4/93";
  34 #endif /* LIBC_SCCS and not lint */
  35
  36 #ifndef __STDC__
  37 #define const
  38 #endif
  39 #include <config.h>
  40 #include <krb5/roken.h>
  41
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45
  46 /*
  47  * get option letter from argument vector
  48  */
  49 ROKEN_LIB_VARIABLE int opterr = 1; /* if error message should be printed */
  50 ROKEN_LIB_VARIABLE int optind = 1; /* index into parent argv vector */
  51 ROKEN_LIB_VARIABLE int optopt;   /* character checked for validity */
  52 int     optreset;                /* reset getopt */
  53 ROKEN_LIB_VARIABLE char *optarg; /* argument associated with option */
  54
  55 #define BADCH   (int)'?'
  56 #define BADARG  (int)':'
  57 #define EMSG    ""
  58
  59 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
  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         char *p;
  65
  66         if (optreset || !*place) {              /* update scanning pointer */
  67                 optreset = 0;
  68                 if (optind >= nargc || *(place = nargv[optind]) != '-') {
  69                         place = EMSG;
  70                         return(-1);
  71                 }
  72                 if (place[1] && *++place == '-') {      /* found "--" */
  73                         ++optind;
  74                         place = EMSG;
  75                         return(-1);
  76                 }
  77         }                                       /* option letter okay? */
  78         if ((optopt = (int)*place++) == (int)':' ||
  79             !(oli = strchr(ostr, optopt))) {
  80                 /*
  81                  * if the user didn't specify '-' as an option,
  82                  * assume it means -1 (EOF).
  83                  */
  84                 if (optopt == (int)'-')
  85                         return(-1);
  86                 if (!*place)
  87                         ++optind;
  88                 if (opterr && *ostr != ':') {
  89                         if (!(p = strrchr(*nargv, '/')))
  90                                 p = *nargv;
  91                         else
  92                                 ++p;
  93                         fprintf(stderr, "%s: illegal option -- %c\n",
  94                             p, optopt);
  95                 }
  96                 return(BADCH);
  97         }
  98         if (*++oli != ':') {                    /* don't need argument */
  99                 optarg = NULL;
 100                 if (!*place)
 101                         ++optind;
 102         }
 103         else {                                  /* need an argument */
 104                 if (*place)                     /* no white space */
 105                         optarg = place;
 106                 else if (nargc <= ++optind) {   /* no arg */
 107                         place = EMSG;
 108                         if (!(p = strrchr(*nargv, '/')))
 109                                 p = *nargv;
 110                         else
 111                                 ++p;
 112                         if (*ostr == ':')
 113                                 return(BADARG);
 114                         if (opterr)
 115                                 fprintf(stderr,
 116                                     "%s: option requires an argument -- %c\n",
 117                                     p, optopt);
 118                         return(BADCH);
 119                 }
 120                 else                            /* white space */
 121                         optarg = nargv[optind];
 122                 place = EMSG;
 123                 ++optind;
 124         }
 125         return(optopt);                         /* dump back option letter */
 126 }