| 1 | /* $Id: getopt.c,v 1.2 2005/07/07 16:34:06 dron Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Copyright (c) 1987, 1993, 1994
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * 3. Neither the name of the University nor the names of its contributors
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| 16 | * may be used to endorse or promote products derived from this software
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| 17 | * without specific prior written permission.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 29 | * SUCH DAMAGE.
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| 30 | */
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| 31 |
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| 32 | #if 0
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| 33 | static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95";
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| 34 | __RCSID("$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $");
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| 35 | #endif
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| 36 |
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| 37 | #include <stdio.h>
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| 38 | #include <string.h>
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| 39 |
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| 40 | int opterr = 1, /* if error message should be printed */
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| 41 | optind = 1, /* index into parent argv vector */
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| 42 | optopt, /* character checked for validity */
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| 43 | optreset; /* reset getopt */
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| 44 | char *optarg; /* argument associated with option */
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| 45 |
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| 46 | #define BADCH (int)'?'
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| 47 | #define BADARG (int)':'
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| 48 | #define EMSG ""
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| 49 |
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| 50 | /*
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| 51 | * getopt --
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| 52 | * Parse argc/argv argument vector.
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| 53 | */
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| 54 | int
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| 55 | getopt(int argc, char * const argv[], const char *optstring)
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| 56 | {
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| 57 | static char *place = EMSG; /* option letter processing */
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| 58 | char *oli; /* option letter list index */
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| 59 |
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| 60 | if (optreset || *place == 0) { /* update scanning pointer */
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| 61 | optreset = 0;
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| 62 | place = argv[optind];
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| 63 | if (optind >= argc || *place++ != '-') {
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| 64 | /* Argument is absent or is not an option */
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| 65 | place = EMSG;
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| 66 | return (-1);
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| 67 | }
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| 68 | optopt = *place++;
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| 69 | if (optopt == '-' && *place == 0) {
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| 70 | /* "--" => end of options */
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| 71 | ++optind;
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| 72 | place = EMSG;
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| 73 | return (-1);
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| 74 | }
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| 75 | if (optopt == 0) {
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| 76 | /* Solitary '-', treat as a '-' option
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| 77 | if the program (eg su) is looking for it. */
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| 78 | place = EMSG;
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| 79 | if (strchr(optstring, '-') == NULL)
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| 80 | return -1;
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| 81 | optopt = '-';
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| 82 | }
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| 83 | } else
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| 84 | optopt = *place++;
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| 85 |
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| 86 | /* See if option letter is one the caller wanted... */
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| 87 | if (optopt == ':' || (oli = strchr(optstring, optopt)) == NULL) {
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| 88 | if (*place == 0)
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| 89 | ++optind;
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| 90 | if (opterr && *optstring != ':')
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| 91 | (void)fprintf(stderr,
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| 92 | "unknown option -- %c\n", optopt);
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| 93 | return (BADCH);
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| 94 | }
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| 95 |
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| 96 | /* Does this option need an argument? */
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| 97 | if (oli[1] != ':') {
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| 98 | /* don't need argument */
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| 99 | optarg = NULL;
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| 100 | if (*place == 0)
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| 101 | ++optind;
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| 102 | } else {
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| 103 | /* Option-argument is either the rest of this argument or the
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| 104 | entire next argument. */
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| 105 | if (*place)
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| 106 | optarg = place;
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| 107 | else if (argc > ++optind)
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| 108 | optarg = argv[optind];
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| 109 | else {
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| 110 | /* option-argument absent */
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| 111 | place = EMSG;
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| 112 | if (*optstring == ':')
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| 113 | return (BADARG);
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| 114 | if (opterr)
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| 115 | (void)fprintf(stderr,
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| 116 | "option requires an argument -- %c\n",
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| 117 | optopt);
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| 118 | return (BADCH);
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| 119 | }
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| 120 | place = EMSG;
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| 121 | ++optind;
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| 122 | }
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| 123 | return (optopt); /* return option letter */
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| 124 | }
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