contrib/nvi/clib/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 #include "config.h"
  35
  36 #if defined(LIBC_SCCS) && !defined(lint)
  37 static const char sccsid[] = "@(#)getopt.c      8.2 (Berkeley) 4/2/94";
  38 #endif /* LIBC_SCCS and not lint */
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43
  44 int     opterr = 1,             /* if error message should be printed */
  45         optind = 1,             /* index into parent argv vector */
  46         optopt,                 /* character checked for validity */
  47         optreset;               /* reset getopt */
  48 char    *optarg;                /* argument associated with option */
  49
  50 #define BADCH   (int)'?'
  51 #define BADARG  (int)':'
  52 #define EMSG    ""
  53
  54 /*
  55  * getopt --
  56  *      Parse argc/argv argument vector.
  57  *
  58  * PUBLIC: #ifndef HAVE_GETOPT
  59  * PUBLIC: int getopt __P((int, char * const *, const char *));
  60  * PUBLIC: #endif
  61  */
  62 int
  63 getopt(nargc, nargv, ostr)
  64         int nargc;
  65         char * const *nargv;
  66         const char *ostr;
  67 {
  68         static char *progname;
  69         static char *place = EMSG;              /* option letter processing */
  70         char *oli;                              /* option letter list index */
  71
  72         if (!progname) {
  73                 if ((progname = strrchr(*nargv, '/')) == NULL)
  74                         progname = *nargv;
  75                 else
  76                         ++progname;
  77         }
  78
  79         if (optreset || !*place) {              /* update scanning pointer */
  80                 optreset = 0;
  81                 if (optind >= nargc || *(place = nargv[optind]) != '-') {
  82                         place = EMSG;
  83                         return (EOF);
  84                 }
  85                 if (place[1] && *++place == '-') {      /* found "--" */
  86                         ++optind;
  87                         place = EMSG;
  88                         return (EOF);
  89                 }
  90         }                                       /* option letter okay? */
  91         if ((optopt = (int)*place++) == (int)':' ||
  92             !(oli = strchr(ostr, optopt))) {
  93                 /*
  94                  * if the user didn't specify '-' as an option,
  95                  * assume it means EOF.
  96                  */
  97                 if (optopt == (int)'-')
  98                         return (EOF);
  99                 if (!*place)
 100                         ++optind;
 101                 if (opterr && *ostr != ':')
 102                         (void)fprintf(stderr,
 103                             "%s: illegal option -- %c\n", progname, optopt);
 104                 return (BADCH);
 105         }
 106         if (*++oli != ':') {                    /* don't need argument */
 107                 optarg = NULL;
 108                 if (!*place)
 109                         ++optind;
 110         }
 111         else {                                  /* need an argument */
 112                 if (*place)                     /* no white space */
 113                         optarg = place;
 114                 else if (nargc <= ++optind) {   /* no arg */
 115                         place = EMSG;
 116                         if (*ostr == ':')
 117                                 return (BADARG);
 118                         if (opterr)
 119                                 (void)fprintf(stderr,
 120                                     "%s: option requires an argument -- %c\n",
 121                                     progname, optopt);
 122                         return (BADCH);
 123                 }
 124                 else                            /* white space */
 125                         optarg = nargv[optind];
 126                 place = EMSG;
 127                 ++optind;
 128         }
 129         return (optopt);                        /* dump back option letter */
 130 }