stdlib/FreeBSD/getopt.c

   1 /*      $NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $  */
   2
   3 /*
   4  * Copyright (c) 1987, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #if defined(LIBC_SCCS) && !defined(lint)
  37 static char sccsid[] = "@(#)getopt.c    8.3 (Berkeley) 4/27/95";
  38 #endif /* LIBC_SCCS and not lint */
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD: src/lib/libc/stdlib/getopt.c,v 1.7 2004/03/06 17:05:45 ache Exp $");
  41
  42 #include "namespace.h"
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include "un-namespace.h"
  48
  49 #include "libc_private.h"
  50
  51 int     opterr = 1,             /* if error message should be printed */
  52         optind = 1,             /* index into parent argv vector */
  53         optopt,                 /* character checked for validity */
  54         optreset;               /* reset getopt */
  55 char    *optarg;                /* argument associated with option */
  56
  57 #define BADCH   (int)'?'
  58 #define BADARG  (int)':'
  59 #define EMSG    ""
  60
  61 /*
  62  * getopt --
  63  *      Parse argc/argv argument vector.
  64  */
  65 int
  66 getopt(nargc, nargv, ostr)
  67         int nargc;
  68         char * const nargv[];
  69         const char *ostr;
  70 {
  71         static char *place = EMSG;              /* option letter processing */
  72         char *oli;                              /* option letter list index */
  73
  74         if (optreset || *place == 0) {          /* update scanning pointer */
  75                 optreset = 0;
  76                 place = nargv[optind];
  77                 if (optind >= nargc || *place++ != '-') {
  78                         /* Argument is absent or is not an option */
  79                         place = EMSG;
  80                         return (-1);
  81                 }
  82                 optopt = *place++;
  83                 if (optopt == '-' && *place == 0) {
  84                         /* "--" => end of options */
  85                         ++optind;
  86                         place = EMSG;
  87                         return (-1);
  88                 }
  89                 if (optopt == 0) {
  90                         /* Solitary '-', treat as a '-' option
  91                            if the program (eg su) is looking for it. */
  92                         place = EMSG;
  93                         if (strchr(ostr, '-') == NULL)
  94                                 return (-1);
  95                         optopt = '-';
  96                 }
  97         } else
  98                 optopt = *place++;
  99
 100         /* See if option letter is one the caller wanted... */
 101         if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
 102                 if (*place == 0)
 103                         ++optind;
 104                 if (opterr && *ostr != ':')
 105                         (void)fprintf(stderr,
 106                             "%s: illegal option -- %c\n", _getprogname(),
 107                             optopt);
 108                 return (BADCH);
 109         }
 110
 111         /* Does this option need an argument? */
 112         if (oli[1] != ':') {
 113                 /* don't need argument */
 114                 optarg = NULL;
 115                 if (*place == 0)
 116                         ++optind;
 117         } else {
 118                 /* Option-argument is either the rest of this argument or the
 119                    entire next argument. */
 120                 if (*place)
 121                         optarg = place;
 122                 else if (nargc > ++optind)
 123                         optarg = nargv[optind];
 124                 else {
 125                         /* option-argument absent */
 126                         place = EMSG;
 127                         if (*ostr == ':')
 128                                 return (BADARG);
 129                         if (opterr)
 130                                 (void)fprintf(stderr,
 131                                     "%s: option requires an argument -- %c\n",
 132                                     _getprogname(), optopt);
 133                         return (BADCH);
 134                 }
 135                 place = EMSG;
 136                 ++optind;
 137         }
 138         return (optopt);                        /* return option letter */
 139 }