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";
51 /* declarations to provide consistent linkage */
56 int opterr = 1, /* if error message should be printed */
57 optind = 1, /* index into parent argv vector */
58 optopt, /* character checked for validity */
59 optreset; /* reset getopt */
60 char *optarg; /* argument associated with option */
62 #define BADCH (int)'?'
63 #define BADARG (int)':'
68 * Parse argc/argv argument vector.
71 getopt(nargc, nargv, ostr)
76 static char *place = EMSG; /* option letter processing */
77 char *oli; /* option letter list index */
79 if (optreset || !*place) { /* update scanning pointer */
81 if (optind >= nargc || *(place = nargv[optind]) != '-') {
85 if (place[1] && *++place == '-') { /* found "--" */
90 } /* option letter okay? */
91 if ((optopt = (int)*place++) == (int)':' ||
92 !(oli = strchr(ostr, optopt))) {
94 * if the user didn't specify '-' as an option,
95 * assume it means EOF.
97 if (optopt == (int)'-')
101 if (opterr && *ostr != ':')
102 (void)fprintf(stderr,
103 "%s: illegal option -- %c\n", __FILE__, optopt);
106 if (*++oli != ':') { /* don't need argument */
111 else { /* need an argument */
112 if (*place) /* no white space */
114 else if (nargc <= ++optind) { /* no arg */
119 (void)fprintf(stderr,
120 "%s: option requires an argument -- %c\n",
124 else /* white space */
125 optarg = nargv[optind];
129 return (optopt); /* dump back option letter */