Merge branch 'obsd-master'
[tmux.git] / compat / getopt.c
blob26e0e6d9bffebc50f80bee876bbd37f2d55f17b9
1 /*
2 * Copyright (c) 1987, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
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.
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.
30 /* OPENBSD ORIGINAL: lib/libc/stdlib/getopt.c */
32 #include "compat.h"
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
38 int BSDopterr = 1, /* if error message should be printed */
39 BSDoptind = 1, /* index into parent argv vector */
40 BSDoptopt, /* character checked for validity */
41 BSDoptreset; /* reset getopt */
42 char *BSDoptarg; /* argument associated with option */
44 #define BADCH (int)'?'
45 #define BADARG (int)':'
46 #define EMSG ""
49 * getopt --
50 * Parse argc/argv argument vector.
52 int
53 BSDgetopt(int nargc, char *const *nargv, const char *ostr)
55 static const char *place = EMSG; /* option letter processing */
56 char *oli; /* option letter list index */
58 if (ostr == NULL)
59 return (-1);
61 if (BSDoptreset || !*place) { /* update scanning pointer */
62 BSDoptreset = 0;
63 if (BSDoptind >= nargc || *(place = nargv[BSDoptind]) != '-') {
64 place = EMSG;
65 return (-1);
67 if (place[1] && *++place == '-') { /* found "--" */
68 if (place[1])
69 return (BADCH);
70 ++BSDoptind;
71 place = EMSG;
72 return (-1);
74 } /* option letter okay? */
75 if ((BSDoptopt = (int)*place++) == (int)':' ||
76 !(oli = strchr(ostr, BSDoptopt))) {
78 * if the user didn't specify '-' as an option,
79 * assume it means -1.
81 if (BSDoptopt == (int)'-')
82 return (-1);
83 if (!*place)
84 ++BSDoptind;
85 if (BSDopterr && *ostr != ':')
86 (void)fprintf(stderr,
87 "%s: unknown option -- %c\n", getprogname(),
88 BSDoptopt);
89 return (BADCH);
91 if (*++oli != ':') { /* don't need argument */
92 BSDoptarg = NULL;
93 if (!*place)
94 ++BSDoptind;
96 else { /* need an argument */
97 if (*place) /* no white space */
98 BSDoptarg = (char *)place;
99 else if (nargc <= ++BSDoptind) { /* no arg */
100 place = EMSG;
101 if (*ostr == ':')
102 return (BADARG);
103 if (BSDopterr)
104 (void)fprintf(stderr,
105 "%s: option requires an argument -- %c\n",
106 getprogname(), BSDoptopt);
107 return (BADCH);
109 else /* white space */
110 BSDoptarg = nargv[BSDoptind];
111 place = EMSG;
112 ++BSDoptind;
114 return (BSDoptopt); /* dump back option letter */