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  * 4. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #if defined(LIBC_SCCS) && !defined(lint)
  33 static char sccsid[] = "@(#)getopt.c    8.3 (Berkeley) 4/27/95";
  34 #endif /* LIBC_SCCS and not lint */
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD: src/lib/libc/stdlib/getopt.c,v 1.8 2007/01/09 00:28:10 imp Exp $");
  37
  38 #include "namespace.h"
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43 #include "un-namespace.h"
  44
  45 #include "libc_private.h"
  46
  47 int     opterr = 1,             /* if error message should be printed */
  48         optind = 1,             /* index into parent argv vector */
  49         optopt,                 /* character checked for validity */
  50         optreset;               /* reset getopt */
  51 char    *optarg;                /* argument associated with option */
  52
  53 #define BADCH   (int)'?'
  54 #define BADARG  (int)':'
  55 #define EMSG    ""
  56
  57 /*
  58  * getopt --
  59  *      Parse argc/argv argument vector.
  60  */
  61 int
  62 getopt(nargc, nargv, ostr)
  63         int nargc;
  64         char * const nargv[];
  65         const char *ostr;
  66 {
  67         static char *place = EMSG;              /* option letter processing */
  68         char *oli;                              /* option letter list index */
  69
  70         if (optreset || *place == 0) {          /* update scanning pointer */
  71                 optreset = 0;
  72                 place = nargv[optind];
  73                 if (optind >= nargc || *place++ != '-') {
  74                         /* Argument is absent or is not an option */
  75                         place = EMSG;
  76                         return (-1);
  77                 }
  78                 optopt = *place++;
  79                 if (optopt == '-' && *place == 0) {
  80                         /* "--" => end of options */
  81                         ++optind;
  82                         place = EMSG;
  83                         return (-1);
  84                 }
  85                 if (optopt == 0) {
  86                         /* Solitary '-', treat as a '-' option
  87                            if the program (eg su) is looking for it. */
  88                         place = EMSG;
  89                         if (strchr(ostr, '-') == NULL)
  90                                 return (-1);
  91                         optopt = '-';
  92                 }
  93         } else
  94                 optopt = *place++;
  95
  96         /* See if option letter is one the caller wanted... */
  97         if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
  98                 if (*place == 0)
  99                         ++optind;
 100                 if (opterr && *ostr != ':')
 101                         (void)fprintf(stderr,
 102                             "%s: illegal option -- %c\n", _getprogname(),
 103                             optopt);
 104                 return (BADCH);
 105         }
 106
 107         /* Does this option need an argument? */
 108         if (oli[1] != ':') {
 109                 /* don't need argument */
 110                 optarg = NULL;
 111                 if (*place == 0)
 112                         ++optind;
 113         } else {
 114                 /* Option-argument is either the rest of this argument or the
 115                    entire next argument. */
 116                 if (*place)
 117                         optarg = place;
 118                 else if (nargc > ++optind)
 119                         optarg = nargv[optind];
 120                 else {
 121                         /* option-argument absent */
 122                         place = EMSG;
 123                         if (*ostr == ':')
 124                                 return (BADARG);
 125                         if (opterr)
 126                                 (void)fprintf(stderr,
 127                                     "%s: option requires an argument -- %c\n",
 128                                     _getprogname(), optopt);
 129                         return (BADCH);
 130                 }
 131                 place = EMSG;
 132                 ++optind;
 133         }
 134         return (optopt);                        /* return option letter */
 135 }