1 /*
2 * Original file name getopt.c Initial import into the c-ares source tree
3 * on 2007-04-11. Lifted from version 5.2 of the 'Open Mash' project with
4 * the modified BSD license, BSD license without the advertising clause.
5 *
6 */
7
8 /*
9 * getopt.c --
10 *
11 * Standard UNIX getopt function. Code is from BSD.
12 *
13 * Copyright (c) 1987-2001 The Regents of the University of California.
14 * All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions are met:
18 *
19 * A. Redistributions of source code must retain the above copyright notice,
20 * this list of conditions and the following disclaimer.
21 * B. Redistributions in binary form must reproduce the above copyright notice,
22 * this list of conditions and the following disclaimer in the documentation
23 * and/or other materials provided with the distribution.
24 * C. Neither the names of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from this
26 * software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
29 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
30 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
31 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
32 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
33 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
34 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
35 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
36 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
37 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38 * POSSIBILITY OF SUCH DAMAGE.
39 */
40
41 /* #if !defined(lint)
42 * static char sccsid[] = "@(#)getopt.c 8.2 (Berkeley) 4/2/94";
43 * #endif
44 */
45
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include "ares_getopt.h"
50
51 int opterr = 1, /* if error message should be printed */
52 optind = 1; /* index into parent argv vector */
53 int optopt = 0; /* character checked for validity */
54 static int optreset; /* reset getopt */
55 char *optarg; /* argument associated with option */
56
57 #define BADCH (int)'?'
58 #define BADARG (int)':'
59 #define EMSG (char *)""
60
61 /*
62 * ares_getopt --
63 * Parse argc/argv argument vector.
64 */
65 int
ares_getopt(int nargc,char * const nargv[],const char * ostr)66 ares_getopt(int nargc, char * const nargv[], const char *ostr)
67 {
68 static char *place = EMSG; /* option letter processing */
69 char *oli; /* option letter list index */
70
71 if (optreset || !*place) { /* update scanning pointer */
72 optreset = 0;
73 if (optind >= nargc || *(place = nargv[optind]) != '-') {
74 place = EMSG;
75 return (EOF);
76 }
77 if (place[1] && *++place == '-') { /* found "--" */
78 ++optind;
79 place = EMSG;
80 return (EOF);
81 }
82 } /* option letter okay? */
83 if ((optopt = (int)*place++) == (int)':' ||
84 (oli = strchr(ostr, optopt)) == NULL) {
85 /*
86 * if the user didn't specify '-' as an option,
87 * assume it means EOF.
88 */
89 if (optopt == (int)'-')
90 return (EOF);
91 if (!*place)
92 ++optind;
93 if (opterr && *ostr != ':')
94 (void)fprintf(stderr,
95 "%s: illegal option -- %c\n", __FILE__, optopt);
96 return (BADCH);
97 }
98 if (*++oli != ':') { /* don't need argument */
99 optarg = NULL;
100 if (!*place)
101 ++optind;
102 }
103 else { /* need an argument */
104 if (*place) /* no white space */
105 optarg = place;
106 else if (nargc <= ++optind) { /* no arg */
107 place = EMSG;
108 if (*ostr == ':')
109 return (BADARG);
110 if (opterr)
111 (void)fprintf(stderr,
112 "%s: option requires an argument -- %c\n",
113 __FILE__, optopt);
114 return (BADCH);
115 }
116 else /* white space */
117 optarg = nargv[optind];
118 place = EMSG;
119 ++optind;
120 }
121 return (optopt); /* dump back option letter */
122 }
123