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Import modified version of FreeBSD getopt.c
author David Demelier <markand@malikania.fr>
date Fri, 04 Nov 2011 15:59:47 +0100
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53:bbe0713e8e2a 54:ebf1460c331e
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 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35
36 int opterr = 1, /* if error message should be printed */
37 optind = 1, /* index into parent argv vector */
38 optopt, /* character checked for validity */
39 optreset; /* reset getopt */
40 char *optarg; /* argument associated with option */
41
42 #define BADCH (int)'?'
43 #define BADARG (int)':'
44 #define EMSG ""
45
46 /*
47 * getopt --
48 * Parse argc/argv argument vector.
49 */
50 int
51 getopt(nargc, nargv, ostr)
52 int nargc;
53 char * const nargv[];
54 const char *ostr;
55 {
56 static char *place = EMSG; /* option letter processing */
57 char *oli; /* option letter list index */
58
59 if (optreset || *place == 0) { /* update scanning pointer */
60 optreset = 0;
61 place = nargv[optind];
62 if (optind >= nargc || *place++ != '-') {
63 /* Argument is absent or is not an option */
64 place = EMSG;
65 return (-1);
66 }
67 optopt = *place++;
68 if (optopt == '-' && *place == 0) {
69 /* "--" => end of options */
70 ++optind;
71 place = EMSG;
72 return (-1);
73 }
74 if (optopt == 0) {
75 /* Solitary '-', treat as a '-' option
76 if the program (eg su) is looking for it. */
77 place = EMSG;
78 if (strchr(ostr, '-') == NULL)
79 return (-1);
80 optopt = '-';
81 }
82 } else
83 optopt = *place++;
84
85 /* See if option letter is one the caller wanted... */
86 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
87 if (*place == 0)
88 ++optind;
89 if (opterr && *ostr != ':')
90 (void)fprintf(stderr,
91 "illegal option -- %c\n", optopt);
92 return (BADCH);
93 }
94
95 /* Does this option need an argument? */
96 if (oli[1] != ':') {
97 /* don't need argument */
98 optarg = NULL;
99 if (*place == 0)
100 ++optind;
101 } else {
102 /* Option-argument is either the rest of this argument or the
103 entire next argument. */
104 if (*place)
105 optarg = place;
106 else if (nargc > ++optind)
107 optarg = nargv[optind];
108 else {
109 /* option-argument absent */
110 place = EMSG;
111 if (*ostr == ':')
112 return (BADARG);
113 if (opterr)
114 (void)fprintf(stderr,
115 "option requires an argument -- %c\n", optopt);
116 return (BADCH);
117 }
118 place = EMSG;
119 ++optind;
120 }
121 return (optopt); /* return option letter */
122 }