Mercurial > irccd

comparison extern/libcompat/src/getopt.c @ 934:243f9f51b0ff

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
irccd: import libcompat and utilities
author David Demelier <markand@malikania.fr>
date Sun, 10 Jan 2021 16:56:32 +0100
parents
children
comparison
equal deleted inserted replaced
933:a29cd04e3878 934:243f9f51b0ff
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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33
34 int opterr = 1, /* if error message should be printed */
35 optind = 1, /* index into parent argv vector */
36 optopt, /* character checked for validity */
37 optreset; /* reset getopt */
38 char *optarg; /* argument associated with option */
39
40 #define BADCH (int)'?'
41 #define BADARG (int)':'
42 #define EMSG ""
43
44 /*
45 * getopt --
46 * Parse argc/argv argument vector.
47 */
48 int
49 getopt(int nargc, char * const *nargv, const char *ostr)
50 {
51 static char *place = EMSG; /* option letter processing */
52 char *oli; /* option letter list index */
53
54 if (ostr == NULL)
55 return (-1);
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)fprintf(stderr,
81 "illegal option -- %c\n", optopt);
82 return (BADCH);
83 }
84 if (*++oli != ':') { /* don't need argument */
85 optarg = NULL;
86 if (!*place)
87 ++optind;
88 }
89 else { /* need an argument */
90 if (*place) /* no white space */
91 optarg = place;
92 else if (nargc <= ++optind) { /* no arg */
93 place = EMSG;
94 if (*ostr == ':')
95 return (BADARG);
96 if (opterr)
97 (void)fprintf(stderr,
98 "option requires an argument -- %c\n",
99 optopt);
100 return (BADCH);
101 }
102 else /* white space */
103 optarg = nargv[optind];
104 place = EMSG;
105 ++optind;
106 }
107 return (optopt); /* dump back option letter */
108 }