2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright (c) 1991 Keith Muller.
6 * The Regents of the University of California. All rights reserved.
8 * This code is derived from software contributed to Berkeley by
9 * Keith Muller of the University of California, San Diego.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 static char sccsid[] = "@(#)egetopt.c 8.1 (Berkeley) 6/6/93";
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD$");
56 * egetopt: get option letter from argument vector (an extended
59 * Non standard additions to the ostr specs are:
60 * 1) '?': immediate value following arg is optional (no white space
61 * between the arg and the value)
62 * 2) '#': +/- followed by a number (with an optional sign but
63 * no white space between the arg and the number). The - may be
64 * combined with other options, but the + cannot.
67 int eopterr = 1; /* if error message should be printed */
68 int eoptind = 1; /* index into parent argv vector */
69 int eoptopt; /* character checked for validity */
70 char *eoptarg; /* argument associated with option */
72 #define BADCH (int)'?'
74 static char emsg[] = "";
77 egetopt(int nargc, char * const *nargv, const char *ostr)
79 static char *place = emsg; /* option letter processing */
80 char *oli; /* option letter list index */
81 static int delim; /* which option delimiter */
83 static char savec = '\0';
92 * update scanning pointer
94 if ((eoptind >= nargc) ||
95 ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
101 if (place[1] && *++place == '-' && !place[1]) {
112 * check option letter
114 if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
115 !(oli = strchr(ostr, eoptopt))) {
117 * if the user didn't specify '-' as an option,
118 * assume it means -1 when by itself.
120 if ((eoptopt == (int)'-') && !*place)
122 if (strchr(ostr, '#') && (isdigit(eoptopt) ||
123 (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
126 * # option: +/- with a number is ok
128 for (p = place; *p != '\0'; ++p) {
148 if (!(p = strrchr(*nargv, '/')))
152 (void)fprintf(stderr, "%s: illegal option -- %c\n",
157 if (delim == (int)'+') {
159 * '+' is only allowed with numbers
164 if (!(p = strrchr(*nargv, '/')))
168 (void)fprintf(stderr,
169 "%s: illegal '+' delimiter with option -- %c\n",
175 if ((*oli != ':') && (*oli != '?')) {
177 * don't need argument
190 } else if (*oli == '?') {
192 * no arg, but NOT required
195 } else if (nargc <= ++eoptind) {
197 * no arg, but IS required
201 if (!(p = strrchr(*nargv, '/')))
205 (void)fprintf(stderr,
206 "%s: option requires an argument -- %c\n", p,
212 * arg has white space
214 eoptarg = nargv[eoptind];