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.
12 * Standard UNIX getopt function. Code is from BSD.
14 * Copyright (c) 1987-2001 The Regents of the University of California.
15 * All rights reserved.
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are met:
20 * A. Redistributions of source code must retain the above copyright notice,
21 * this list of conditions and the following disclaimer.
22 * B. Redistributions in binary form must reproduce the above copyright notice,
23 * this list of conditions and the following disclaimer in the documentation
24 * and/or other materials provided with the distribution.
25 * C. Neither the names of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from this
27 * software without specific prior written permission.
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
30 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
31 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
32 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
33 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
34 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
35 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
36 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
37 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
39 * POSSIBILITY OF SUCH DAMAGE.
43 * static char sccsid[] = "@(#)getopt.c 8.2 (Berkeley) 4/2/94";
50 #include "ares_getopt.h"
52 int opterr = 1, /* if error message should be printed */
53 optind = 1, /* index into parent argv vector */
54 optopt, /* character checked for validity */
55 optreset; /* reset getopt */
56 char *optarg; /* argument associated with option */
58 #define BADCH (int)'?'
59 #define BADARG (int)':'
60 #define EMSG (char *)""
64 * Parse argc/argv argument vector.
67 ares_getopt(int nargc, char * const nargv[], const char *ostr)
69 static char *place = EMSG; /* option letter processing */
70 char *oli; /* option letter list index */
72 if (optreset || !*place) { /* update scanning pointer */
74 if (optind >= nargc || *(place = nargv[optind]) != '-') {
78 if (place[1] && *++place == '-') { /* found "--" */
83 } /* option letter okay? */
84 if ((optopt = (int)*place++) == (int)':' ||
85 (oli = strchr(ostr, optopt)) == NULL) {
87 * if the user didn't specify '-' as an option,
88 * assume it means EOF.
90 if (optopt == (int)'-')
94 if (opterr && *ostr != ':')
96 "%s: illegal option -- %c\n", __FILE__, optopt);
99 if (*++oli != ':') { /* don't need argument */
104 else { /* need an argument */
105 if (*place) /* no white space */
107 else if (nargc <= ++optind) { /* no arg */
112 (void)fprintf(stderr,
113 "%s: option requires an argument -- %c\n",
117 else /* white space */
118 optarg = nargv[optind];
122 return (optopt); /* dump back option letter */