1 /* $Id: getopt.c,v 1.3 2009-01-22 20:53:07 fwarmerdam 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. 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 0
33 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95";
34 __RCSID("$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $");
35 #endif
36
37 #include <stdio.h>
38 #include <string.h>
39 #include "libport.h"
40
41 int opterr = 1, /* if error message should be printed */
42 optind = 1, /* index into parent argv vector */
43 optopt, /* character checked for validity */
44 optreset; /* reset getopt */
45 char *optarg; /* argument associated with option */
46
47 #define BADCH (int)'?'
48 #define BADARG (int)':'
49 #define EMSG ""
50
51 /*
52 * getopt --
53 * Parse argc/argv argument vector.
54 */
55 int
getopt(int argc,char * const argv[],const char * optstring)56 getopt(int argc, char * const argv[], const char *optstring)
57 {
58 static char *place = EMSG; /* option letter processing */
59 char *oli; /* option letter list index */
60
61 if (optreset || *place == 0) { /* update scanning pointer */
62 optreset = 0;
63 place = argv[optind];
64 if (optind >= argc || *place++ != '-') {
65 /* Argument is absent or is not an option */
66 place = EMSG;
67 return (-1);
68 }
69 optopt = *place++;
70 if (optopt == '-' && *place == 0) {
71 /* "--" => end of options */
72 ++optind;
73 place = EMSG;
74 return (-1);
75 }
76 if (optopt == 0) {
77 /* Solitary '-', treat as a '-' option
78 if the program (eg su) is looking for it. */
79 place = EMSG;
80 if (strchr(optstring, '-') == NULL)
81 return -1;
82 optopt = '-';
83 }
84 } else
85 optopt = *place++;
86
87 /* See if option letter is one the caller wanted... */
88 if (optopt == ':' || (oli = strchr(optstring, optopt)) == NULL) {
89 if (*place == 0)
90 ++optind;
91 if (opterr && *optstring != ':')
92 (void)fprintf(stderr,
93 "unknown option -- %c\n", optopt);
94 return (BADCH);
95 }
96
97 /* Does this option need an argument? */
98 if (oli[1] != ':') {
99 /* don't need argument */
100 optarg = NULL;
101 if (*place == 0)
102 ++optind;
103 } else {
104 /* Option-argument is either the rest of this argument or the
105 entire next argument. */
106 if (*place)
107 optarg = place;
108 else if (argc > ++optind)
109 optarg = argv[optind];
110 else {
111 /* option-argument absent */
112 place = EMSG;
113 if (*optstring == ':')
114 return (BADARG);
115 if (opterr)
116 (void)fprintf(stderr,
117 "option requires an argument -- %c\n",
118 optopt);
119 return (BADCH);
120 }
121 place = EMSG;
122 ++optind;
123 }
124 return (optopt); /* return option letter */
125 }
126