rosapps/net/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 #if defined(LIBC_SCCS) && !defined(lint)
  38 static char sccsid[] = "@(#)getopt.c    4.13 (Berkeley) 2/23/91";
  39 #endif /* LIBC_SCCS and not lint */
  40
  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 char    *optarg;                /* argument associated with option */
  52
  53 #define BADCH   (int)'?'
  54 #define EMSG    ""
  55
  56 int
  57 getopt(int nargc, char * const *nargv, const char *ostr)
  58 {
  59         static char *place = EMSG;              /* option letter processing */
  60         register char *oli;                     /* option letter list index */
  61         char *p;
  62
  63         if (!*place) {                          /* update scanning pointer */
  64                 if (optind >= nargc || *(place = nargv[optind]) != '-') {
  65                         place = EMSG;
  66                         return(EOF);
  67                 }
  68                 if (place[1] && *++place == '-') {      /* found "--" */
  69                         ++optind;
  70                         place = EMSG;
  71                         return(EOF);
  72                 }
  73         }                                       /* option letter okay? */
  74         if ((optopt = (int)*place++) == (int)':' ||
  75             !(oli = strchr(ostr, optopt))) {
  76                 /*
  77                  * if the user didn't specify '-' as an option,
  78                  * assume it means EOF.
  79                  */
  80                 if (optopt == (int)'-')
  81                         return(EOF);
  82                 if (!*place)
  83                         ++optind;
  84                 if (opterr) {
  85                         if (!(p = strrchr(*nargv, '/')))
  86                                 p = *nargv;
  87                         else
  88                                 ++p;
  89                         (void)fprintf(stderr, "%s: illegal option -- %c\n",
  90                             p, optopt);
  91                 }
  92                 return(BADCH);
  93         }
  94         if (*++oli != ':') {                    /* don't need argument */
  95                 optarg = NULL;
  96                 if (!*place)
  97                         ++optind;
  98         }
  99         else {                                  /* need an argument */
 100                 if (*place)                     /* no white space */
 101                         optarg = place;
 102                 else if (nargc <= ++optind) {   /* no arg */
 103                         place = EMSG;
 104                         if (!(p = strrchr(*nargv, '/')))
 105                                 p = *nargv;
 106                         else
 107                                 ++p;
 108                         if (opterr)
 109                                 (void)fprintf(stderr,
 110                                     "%s: option requires an argument -- %c\n",
 111                                     p, optopt);
 112                         return(BADCH);
 113                 }
 114                 else                            /* white space */
 115                         optarg = nargv[optind];
 116                 place = EMSG;
 117                 ++optind;
 118         }
 119         return(optopt);                         /* dump back option letter */
 120 }