2 * Copyright (c) 1991 Keith Muller.
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
7 * Keith Muller of the University of California, San Diego.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 static char sccsid[] = "@(#)egetopt.c 8.1 (Berkeley) 6/6/93";
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
52 * egetopt: get option letter from argument vector (an extended
55 * Non standard additions to the ostr specs are:
56 * 1) '?': immediate value following arg is optional (no white space
57 * between the arg and the value)
58 * 2) '#': +/- followed by a number (with an optional sign but
59 * no white space between the arg and the number). The - may be
60 * combined with other options, but the + cannot.
63 int eopterr = 1; /* if error message should be printed */
64 int eoptind = 1; /* index into parent argv vector */
65 int eoptopt; /* character checked for validity */
66 char *eoptarg; /* argument associated with option */
68 #define BADCH (int)'?'
70 static char emsg[] = "";
73 egetopt(int nargc, char * const *nargv, const char *ostr)
75 static char *place = emsg; /* option letter processing */
76 char *oli; /* option letter list index */
77 static int delim; /* which option delimeter */
79 static char savec = '\0';
88 * update scanning pointer
90 if ((eoptind >= nargc) ||
91 ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
97 if (place[1] && *++place == '-' && !place[1]) {
108 * check option letter
110 if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
111 !(oli = strchr(ostr, eoptopt))) {
113 * if the user didn't specify '-' as an option,
114 * assume it means -1 when by itself.
116 if ((eoptopt == (int)'-') && !*place)
118 if (strchr(ostr, '#') && (isdigit(eoptopt) ||
119 (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
122 * # option: +/- with a number is ok
124 for (p = place; *p != '\0'; ++p) {
144 if (!(p = strrchr(*nargv, '/')))
148 (void)fprintf(stderr, "%s: illegal option -- %c\n",
153 if (delim == (int)'+') {
155 * '+' is only allowed with numbers
160 if (!(p = strrchr(*nargv, '/')))
164 (void)fprintf(stderr,
165 "%s: illegal '+' delimiter with option -- %c\n",
171 if ((*oli != ':') && (*oli != '?')) {
173 * don't need argument
186 } else if (*oli == '?') {
188 * no arg, but NOT required
191 } else if (nargc <= ++eoptind) {
193 * no arg, but IS required
197 if (!(p = strrchr(*nargv, '/')))
201 (void)fprintf(stderr,
202 "%s: option requires an argument -- %c\n", p,
208 * arg has white space
210 eoptarg = nargv[eoptind];