source: trunk/minix/lib/posix/getopt.c@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 13 years ago

Minix 3.1.2a

File size: 3.5 KB
Line 
1/*
2 * Copyright (c) 1987, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <string.h>
35#include <stdio.h>
36
37int opterr = 1, /* if error message should be printed */
38 optind = 1, /* index into parent argv vector */
39 optopt, /* character checked for validity */
40 optreset; /* reset getopt */
41char *optarg; /* argument associated with option */
42
43#define BADCH (int)'?'
44#define BADARG (int)':'
45#define EMSG ""
46
47/*
48 * getopt --
49 * Parse argc/argv argument vector.
50 */
51int
52getopt(int nargc, char * const nargv[], const char *ostr)
53{
54 static char *place = EMSG; /* option letter processing */
55 char *oli; /* option letter list index */
56
57 if (optreset || !*place) { /* update scanning pointer */
58 optreset = 0;
59 if (optind >= nargc || *(place = nargv[optind]) != '-') {
60 place = EMSG;
61 return (-1);
62 }
63 if (place[1] && *++place == '-') { /* found "--" */
64 ++optind;
65 place = EMSG;
66 return (-1);
67 }
68 } /* option letter okay? */
69 if ((optopt = (int)*place++) == (int)':' ||
70 !(oli = strchr(ostr, optopt))) {
71 /*
72 * if the user didn't specify '-' as an option,
73 * assume it means -1.
74 */
75 if (optopt == (int)'-')
76 return (-1);
77 if (!*place)
78 ++optind;
79 if (opterr && *ostr != ':')
80 (void)printf("illegal option -- %c\n", optopt);
81 return (BADCH);
82 }
83 if (*++oli != ':') { /* don't need argument */
84 optarg = NULL;
85 if (!*place)
86 ++optind;
87 }
88 else { /* need an argument */
89 if (*place) /* no white space */
90 optarg = place;
91 else if (nargc <= ++optind) { /* no arg */
92 place = EMSG;
93 if (*ostr == ':')
94 return (BADARG);
95 if (opterr)
96 (void)printf("option requires an argument -- %c\n", optopt);
97 return (BADCH);
98 }
99 else /* white space */
100 optarg = nargv[optind];
101 place = EMSG;
102 ++optind;
103 }
104 return (optopt); /* dump back option letter */
105}
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