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("$FreeBSD$");
54 * egetopt: get option letter from argument vector (an extended
57 * Non standard additions to the ostr specs are:
58 * 1) '?': immediate value following arg is optional (no white space
59 * between the arg and the value)
60 * 2) '#': +/- followed by a number (with an optional sign but
61 * no white space between the arg and the number). The - may be
62 * combined with other options, but the + cannot.
65 int eopterr
= 1; /* if error message should be printed */
66 int eoptind
= 1; /* index into parent argv vector */
67 int eoptopt
; /* character checked for validity */
68 char *eoptarg
; /* argument associated with option */
70 #define BADCH (int)'?'
72 static char emsg
[] = "";
75 egetopt(int nargc
, char * const *nargv
, const char *ostr
)
77 static char *place
= emsg
; /* option letter processing */
78 char *oli
; /* option letter list index */
79 static int delim
; /* which option delimiter */
81 static char savec
= '\0';
90 * update scanning pointer
92 if ((eoptind
>= nargc
) ||
93 ((*(place
= nargv
[eoptind
]) != '-') && (*place
!= '+'))) {
99 if (place
[1] && *++place
== '-' && !place
[1]) {
110 * check option letter
112 if ((eoptopt
= (int)*place
++) == (int)':' || (eoptopt
== (int)'?') ||
113 !(oli
= strchr(ostr
, eoptopt
))) {
115 * if the user didn't specify '-' as an option,
116 * assume it means -1 when by itself.
118 if ((eoptopt
== (int)'-') && !*place
)
120 if (strchr(ostr
, '#') && (isdigit(eoptopt
) ||
121 (((eoptopt
== (int)'-') || (eoptopt
== (int)'+')) &&
124 * # option: +/- with a number is ok
126 for (p
= place
; *p
!= '\0'; ++p
) {
146 if (!(p
= strrchr(*nargv
, '/')))
150 (void)fprintf(stderr
, "%s: illegal option -- %c\n",
155 if (delim
== (int)'+') {
157 * '+' is only allowed with numbers
162 if (!(p
= strrchr(*nargv
, '/')))
166 (void)fprintf(stderr
,
167 "%s: illegal '+' delimiter with option -- %c\n",
173 if ((*oli
!= ':') && (*oli
!= '?')) {
175 * don't need argument
188 } else if (*oli
== '?') {
190 * no arg, but NOT required
193 } else if (nargc
<= ++eoptind
) {
195 * no arg, but IS required
199 if (!(p
= strrchr(*nargv
, '/')))
203 (void)fprintf(stderr
,
204 "%s: option requires an argument -- %c\n", p
,
210 * arg has white space
212 eoptarg
= nargv
[eoptind
];