dist/smbfs/lib/smb/cfopt.c

   1 /*
   2  * Copyright (c) 2000, Boris Popov
   3  * 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 Boris Popov.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * from: Id: cfopt.c,v 1.3 2000/07/11 01:51:49 bp Exp
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __RCSID("$NetBSD$");
  37
  38 #include <sys/param.h>
  39
  40 #include <stdio.h>
  41 #include <string.h>
  42
  43 #include <cflib.h>
  44
  45 extern char *__progname;
  46
  47 int     cf_opterr = 1,          /* if error message should be printed */
  48         cf_optind = 1,          /* index into parent argv vector */
  49         cf_optopt,                      /* character checked for validity */
  50         cf_optreset;            /* reset getopt */
  51 const char* cf_optarg;          /* argument associated with option */
  52
  53 #define BADCH   (int)'?'
  54 #define BADARG  (int)':'
  55 #define EMSG    ""
  56
  57 int
  58 cf_getopt(nargc, nargv, ostr)
  59         int nargc;
  60         char * const *nargv;
  61         const char *ostr;
  62 {
  63         static const char *place = EMSG;                /* option letter processing */
  64         char *oli;                              /* option letter list index */
  65         int tmpind;
  66
  67         if (cf_optreset || !*place) {           /* update scanning pointer */
  68                 cf_optreset = 0;
  69                 tmpind = cf_optind;
  70                 while (1) {
  71                         if (tmpind >= nargc) {
  72                                 place = EMSG;
  73                                 return (-1);
  74                         }
  75                         if (*(place = nargv[tmpind]) != '-') {
  76                                 tmpind++;
  77                                 continue;       /* lookup next option */
  78                         }
  79                         if (place[1] && *++place == '-') {      /* found "--" */
  80                                 cf_optind = ++tmpind;
  81                                 place = EMSG;
  82                                 return (-1);
  83                         }
  84                         cf_optind = tmpind;
  85                         break;
  86                 }
  87         }                                       /* option letter okay? */
  88         if ((cf_optopt = (int)*place++) == (int)':' ||
  89             !(oli = strchr(ostr, cf_optopt))) {
  90                 /*
  91                  * if the user didn't specify '-' as an option,
  92                  * assume it means -1.
  93                  */
  94                 if (cf_optopt == (int)'-')
  95                         return (-1);
  96                 if (!*place)
  97                         ++cf_optind;
  98                 if (cf_opterr && *ostr != ':')
  99                         (void)fprintf(stderr,
 100                             "%s: illegal option -- %c\n", __progname, cf_optopt);
 101                 return (BADCH);
 102         }
 103         if (*++oli != ':') {                    /* don't need argument */
 104                 cf_optarg = NULL;
 105                 if (!*place)
 106                         ++cf_optind;
 107         }
 108         else {                                  /* need an argument */
 109                 if (*place)                     /* no white space */
 110                         cf_optarg = place;
 111                 else if (nargc <= ++cf_optind) {        /* no arg */
 112                         place = EMSG;
 113                         if (*ostr == ':')
 114                                 return (BADARG);
 115                         if (cf_opterr)
 116                                 (void)fprintf(stderr,
 117                                     "%s: option requires an argument -- %c\n",
 118                                     __progname, cf_optopt);
 119                         return (BADCH);
 120                 }
 121                 else                            /* white space */
 122                         cf_optarg = nargv[cf_optind];
 123                 place = EMSG;
 124                 ++cf_optind;
 125         }
 126         return (cf_optopt);                     /* dump back option letter */
 127 }