1 /*
   2  * Copyright (c) 1987, 1993, 1994
   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 #include "includes.h"
  35 #if !defined(HAVE_GETOPT) || !defined(HAVE_GETOPT_OPTRESET)
  36 
  37 #if defined(LIBC_SCCS) && !defined(lint)
  38 static char *rcsid = "$OpenBSD: getopt.c,v 1.2 1996/08/19 08:33:32 tholo Exp $";
  39 #endif /* LIBC_SCCS and not lint */
  40 
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 
  45 int     BSDopterr = 1,          /* if error message should be printed */
  46         BSDoptind = 1,          /* index into parent argv vector */
  47         BSDoptopt,              /* character checked for validity */
  48         BSDoptreset;            /* reset getopt */
  49 char    *BSDoptarg;             /* argument associated with option */
  50 
  51 #define BADCH   (int)'?'
  52 #define BADARG  (int)':'
  53 #define EMSG    ""
  54 
  55 /*
  56  * getopt --
  57  *      Parse argc/argv argument vector.
  58  */
  59 int
  60 BSDgetopt(nargc, nargv, ostr)
  61         int nargc;
  62         char * const *nargv;
  63         const char *ostr;
  64 {
  65         extern char *__progname;
  66         static char *place = EMSG;              /* option letter processing */
  67         char *oli;                              /* option letter list index */
  68 
  69         if (BSDoptreset || !*place) {           /* update scanning pointer */
  70                 BSDoptreset = 0;
  71                 if (BSDoptind >= nargc || *(place = nargv[BSDoptind]) != '-') {
  72                         place = EMSG;
  73                         return (-1);
  74                 }
  75                 if (place[1] && *++place == '-') {      /* found "--" */
  76                         ++BSDoptind;
  77                         place = EMSG;
  78                         return (-1);
  79                 }
  80         }                                       /* option letter okay? */
  81         if ((BSDoptopt = (int)*place++) == (int)':' ||
  82             !(oli = strchr(ostr, BSDoptopt))) {
  83                 /*
  84                  * if the user didn't specify '-' as an option,
  85                  * assume it means -1.
  86                  */
  87                 if (BSDoptopt == (int)'-')
  88                         return (-1);
  89                 if (!*place)
  90                         ++BSDoptind;
  91                 if (BSDopterr && *ostr != ':')
  92                         (void) fprintf(stderr,
  93                             gettext("%s: illegal option -- %c\n"), __progname,
  94                             BSDoptopt);
  95                 return (BADCH);
  96         }
  97         if (*++oli != ':') {                    /* don't need argument */
  98                 BSDoptarg = NULL;
  99                 if (!*place)
 100                         ++BSDoptind;
 101         } else {                                /* need an argument */
 102                 if (*place)                     /* no white space */
 103                         BSDoptarg = place;
 104                 else if (nargc <= ++BSDoptind) {     /* no arg */
 105                         place = EMSG;
 106                         if (*ostr == ':')
 107                                 return (BADARG);
 108                         if (BSDopterr)
 109                                 (void) fprintf(stderr,
 110                                     "%s: option requires an argument -- %c\n",
 111                                     __progname, BSDoptopt);
 112                         return (BADCH);
 113                 /* white space */
 114                 } else
 115                         BSDoptarg = nargv[BSDoptind];
 116 
 117                 place = EMSG;
 118                 ++BSDoptind;
 119         }
 120         return (BSDoptopt);                     /* dump back option letter */
 121 }
 122 
 123 #endif /* !defined(HAVE_GETOPT) || !defined(HAVE_OPTRESET) */