external/bsd/libpcap/dist/Win32/Src/getopt.c

   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 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)getopt.c    8.3 (Berkeley) 4/27/95";
  36 #endif /* LIBC_SCCS and not lint */
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41
  42 int     opterr = 1,             /* if error message should be printed */
  43         optind = 1,             /* index into parent argv vector */
  44         optopt,                 /* character checked for validity */
  45         optreset;               /* reset getopt */
  46 char    *optarg;                /* argument associated with option */
  47
  48 #define BADCH   (int)'?'
  49 #define BADARG  (int)':'
  50 #define EMSG    ""
  51
  52 /*
  53  * getopt --
  54  *      Parse argc/argv argument vector.
  55  */
  56 int
  57 getopt(nargc, nargv, ostr)
  58         int nargc;
  59         char * const *nargv;
  60         const char *ostr;
  61 {
  62 #ifdef WIN32
  63         char *__progname="windump";
  64 #else
  65         extern char *__progname;
  66 #endif
  67         static char *place = EMSG;              /* option letter processing */
  68         char *oli;                              /* option letter list index */
  69
  70         if (optreset || !*place) {              /* update scanning pointer */
  71                 optreset = 0;
  72                 if (optind >= nargc || *(place = nargv[optind]) != '-') {
  73                         place = EMSG;
  74                         return (-1);
  75                 }
  76                 if (place[1] && *++place == '-') {      /* found "--" */
  77                         ++optind;
  78                         place = EMSG;
  79                         return (-1);
  80                 }
  81         }                                       /* option letter okay? */
  82         if ((optopt = (int)*place++) == (int)':' ||
  83             !(oli = strchr(ostr, optopt))) {
  84                 /*
  85                  * if the user didn't specify '-' as an option,
  86                  * assume it means -1.
  87                  */
  88                 if (optopt == (int)'-')
  89                         return (-1);
  90                 if (!*place)
  91                         ++optind;
  92                 if (opterr && *ostr != ':')
  93                         (void)fprintf(stderr,
  94                             "%s: illegal option -- %c\n", __progname, optopt);
  95                 return (BADCH);
  96         }
  97         if (*++oli != ':') {                    /* don't need argument */
  98                 optarg = NULL;
  99                 if (!*place)
 100                         ++optind;
 101         }
 102         else {                                  /* need an argument */
 103                 if (*place)                     /* no white space */
 104                         optarg = place;
 105                 else if (nargc <= ++optind) {   /* no arg */
 106                         place = EMSG;
 107                         if (*ostr == ':')
 108                                 return (BADARG);
 109                         if (opterr)
 110                                 (void)fprintf(stderr,
 111                                     "%s: option requires an argument -- %c\n",
 112                                     __progname, optopt);
 113                         return (BADCH);
 114                 }
 115                 else                            /* white space */
 116                         optarg = nargv[optind];
 117                 place = EMSG;
 118                 ++optind;
 119         }
 120         return (optopt);                        /* dump back option letter */
 121 }