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("$FreeBSD$");
55 * egetopt: get option letter from argument vector (an extended
58 * Non standard additions to the ostr specs are:
59 * 1) '?': immediate value following arg is optional (no white space
60 * between the arg and the value)
61 * 2) '#': +/- followed by a number (with an optional sign but
62 * no white space between the arg and the number). The - may be
63 * combined with other options, but the + cannot.
66 int eopterr = 1; /* if error message should be printed */
67 int eoptind = 1; /* index into parent argv vector */
68 int eoptopt; /* character checked for validity */
69 char *eoptarg; /* argument associated with option */
71 #define BADCH (int)'?'
73 static char emsg[] = "";
76 egetopt(int nargc, char * const *nargv, const char *ostr)
78 static char *place = emsg; /* option letter processing */
79 char *oli; /* option letter list index */
80 static int delim; /* which option delimeter */
82 static char savec = '\0';
91 * update scanning pointer
93 if ((eoptind >= nargc) ||
94 ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
100 if (place[1] && *++place == '-' && !place[1]) {
111 * check option letter
113 if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
114 !(oli = strchr(ostr, eoptopt))) {
116 * if the user didn't specify '-' as an option,
117 * assume it means -1 when by itself.
119 if ((eoptopt == (int)'-') && !*place)
121 if (strchr(ostr, '#') && (isdigit(eoptopt) ||
122 (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
125 * # option: +/- with a number is ok
127 for (p = place; *p != '\0'; ++p) {
147 if (!(p = strrchr(*nargv, '/')))
151 (void)fprintf(stderr, "%s: illegal option -- %c\n",
156 if (delim == (int)'+') {
158 * '+' is only allowed with numbers
163 if (!(p = strrchr(*nargv, '/')))
167 (void)fprintf(stderr,
168 "%s: illegal '+' delimiter with option -- %c\n",
174 if ((*oli != ':') && (*oli != '?')) {
176 * don't need argument
189 } else if (*oli == '?') {
191 * no arg, but NOT required
194 } else if (nargc <= ++eoptind) {
196 * no arg, but IS required
200 if (!(p = strrchr(*nargv, '/')))
204 (void)fprintf(stderr,
205 "%s: option requires an argument -- %c\n", p,
211 * arg has white space
213 eoptarg = nargv[eoptind];