crypto/heimdal-0.6.3/lib/roken/getopt.c

   1 /*
   2  * Copyright (c) 1987, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. 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  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)getopt.c    8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37
  38 #ifndef __STDC__
  39 #define const
  40 #endif
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44
  45 /*
  46  * get option letter from argument vector
  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         optreset;               /* reset getopt */
  52 char    *optarg;                /* argument associated with option */
  53
  54 #define BADCH   (int)'?'
  55 #define BADARG  (int)':'
  56 #define EMSG    ""
  57
  58 int
  59 getopt(nargc, nargv, ostr)
  60         int nargc;
  61         char * const *nargv;
  62         const char *ostr;
  63 {
  64         static char *place = EMSG;              /* option letter processing */
  65         char *oli;                      /* option letter list index */
  66         char *p;
  67
  68         if (optreset || !*place) {              /* update scanning pointer */
  69                 optreset = 0;
  70                 if (optind >= nargc || *(place = nargv[optind]) != '-') {
  71                         place = EMSG;
  72                         return(-1);
  73                 }
  74                 if (place[1] && *++place == '-') {      /* found "--" */
  75                         ++optind;
  76                         place = EMSG;
  77                         return(-1);
  78                 }
  79         }                                       /* option letter okay? */
  80         if ((optopt = (int)*place++) == (int)':' ||
  81             !(oli = strchr(ostr, optopt))) {
  82                 /*
  83                  * if the user didn't specify '-' as an option,
  84                  * assume it means -1 (EOF).
  85                  */
  86                 if (optopt == (int)'-')
  87                         return(-1);
  88                 if (!*place)
  89                         ++optind;
  90                 if (opterr && *ostr != ':') {
  91                         if (!(p = strrchr(*nargv, '/')))
  92                                 p = *nargv;
  93                         else
  94                                 ++p;
  95                         fprintf(stderr, "%s: illegal option -- %c\n",
  96                             p, optopt);
  97                 }
  98                 return(BADCH);
  99         }
 100         if (*++oli != ':') {                    /* don't need argument */
 101                 optarg = NULL;
 102                 if (!*place)
 103                         ++optind;
 104         }
 105         else {                                  /* need an argument */
 106                 if (*place)                     /* no white space */
 107                         optarg = place;
 108                 else if (nargc <= ++optind) {   /* no arg */
 109                         place = EMSG;
 110                         if (!(p = strrchr(*nargv, '/')))
 111                                 p = *nargv;
 112                         else
 113                                 ++p;
 114                         if (*ostr == ':')
 115                                 return(BADARG);
 116                         if (opterr)
 117                                 fprintf(stderr,
 118                                     "%s: option requires an argument -- %c\n",
 119                                     p, optopt);
 120                         return(BADCH);
 121                 }
 122                 else                            /* white space */
 123                         optarg = nargv[optind];
 124                 place = EMSG;
 125                 ++optind;
 126         }
 127         return(optopt);                         /* dump back option letter */
 128 }