Mercurial > code
comparison getopt.c @ 54:ebf1460c331e
Import modified version of FreeBSD getopt.c
author | David Demelier <markand@malikania.fr> |
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date | Fri, 04 Nov 2011 15:59:47 +0100 |
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53:bbe0713e8e2a | 54:ebf1460c331e |
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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 } |