reactos/base/applications/network/finger/getopt.c

   1 /*
   2  * Copyright (c) 1987 Regents of the University of California.
   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 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  * Fri Jun 13 10:39:00 1997, tfelix@fred.net:
  34  *     Ported to Win32, changed index/rindex to strchr/strrchr
  35  */
  36
  37 #include "precomp.h"
  38
  39 #if defined(LIBC_SCCS) && !defined(lint)
  40 static char sccsid[] = "@(#)getopt.c    4.13 (Berkeley) 2/23/91";
  41 #endif /* LIBC_SCCS and not lint */
  42
  43 /*
  44  * get option letter from argument vector
  45  */
  46 int     opterr = 1,             /* if error message should be printed */
  47         optind = 1,             /* index into parent argv vector */
  48         optopt;                 /* character checked for validity */
  49 const char      *optarg;                /* argument associated with option */
  50
  51 #define BADCH   (int)'?'
  52 #define EMSG    ""
  53
  54 int
  55 getopt(int nargc, char * const *nargv, const char *ostr)
  56 {
  57         static const char *place = EMSG;                /* option letter processing */
  58         register char *oli;                     /* option letter list index */
  59         char *p;
  60
  61         if (!*place) {                          /* update scanning pointer */
  62                 if (optind >= nargc || *(place = nargv[optind]) != '-') {
  63                         place = EMSG;
  64                         return(EOF);
  65                 }
  66                 if (place[1] && *++place == '-') {      /* found "--" */
  67                         ++optind;
  68                         place = EMSG;
  69                         return(EOF);
  70                 }
  71         }                                       /* option letter okay? */
  72         if ((optopt = (int)*place++) == (int)':' ||
  73             !(oli = strchr(ostr, optopt))) {
  74                 /*
  75                  * if the user didn't specify '-' as an option,
  76                  * assume it means EOF.
  77                  */
  78                 if (optopt == (int)'-')
  79                         return(EOF);
  80                 if (!*place)
  81                         ++optind;
  82                 if (opterr) {
  83                         if (!(p = strrchr(*nargv, '/')))
  84                                 p = *nargv;
  85                         else
  86                                 ++p;
  87                         (void)fprintf(stderr, "%s: illegal option -- %c\n",
  88                             p, optopt);
  89                 }
  90                 return(BADCH);
  91         }
  92         if (*++oli != ':') {                    /* don't need argument */
  93                 optarg = NULL;
  94                 if (!*place)
  95                         ++optind;
  96         }
  97         else {                                  /* need an argument */
  98                 if (*place)                     /* no white space */
  99                         optarg = place;
 100                 else if (nargc <= ++optind) {   /* no arg */
 101                         place = EMSG;
 102                         if (!(p = strrchr(*nargv, '/')))
 103                                 p = *nargv;
 104                         else
 105                                 ++p;
 106                         if (opterr)
 107                                 (void)fprintf(stderr,
 108                                     "%s: option requires an argument -- %c\n",
 109                                     p, optopt);
 110                         return(BADCH);
 111                 }
 112                 else                            /* white space */
 113                         optarg = nargv[optind];
 114                 place = EMSG;
 115                 ++optind;
 116         }
 117         return(optopt);                         /* dump back option letter */
 118 }