1 .\" Copyright (C) 2006 Justin Pryzby <pryzbyj@justinpryzby.com>
3 .\" %%%LICENSE_START(PERMISSIVE_MISC)
4 .\" Permission is hereby granted, free of charge, to any person obtaining
5 .\" a copy of this software and associated documentation files (the
6 .\" "Software"), to deal in the Software without restriction, including
7 .\" without limitation the rights to use, copy, modify, merge, publish,
8 .\" distribute, sublicense, and/or sell copies of the Software, and to
9 .\" permit persons to whom the Software is furnished to do so, subject to
10 .\" the following conditions:
12 .\" The above copyright notice and this permission notice shall be
13 .\" included in all copies or substantial portions of the Software.
15 .\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 .\" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 .\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 .\" IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 .\" CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 .\" TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 .\" SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 .\" glibc manual and source
27 .\" 2006-05-19, mtk, various edits and example program
29 .TH RPMATCH 3 2007-07-26 "GNU" "Linux Programmer's Manual"
31 rpmatch \- determine if the answer to a question is affirmative or negative
34 .B #include <stdlib.h>
36 .BI "int rpmatch(const char *" response );
40 Feature Test Macro Requirements for glibc (see
41 .BR feature_test_macros (7)):
48 handles a user response to yes or no questions, with
49 support for internationalization.
52 should be a null-terminated string containing a
53 user-supplied response, perhaps obtained with
58 The user's language preference is taken into account per the
64 if the program has called
66 to effect their changes.
68 Regardless of the locale, responses matching
70 are always accepted as affirmative, and those matching
72 are always accepted as negative.
77 returns 0 for a recognized negative response ("no"), 1
78 for a recognized positive response ("yes"), and \-1 when the value
83 A return value of \-1 may indicate either an invalid input, or some
85 It is incorrect to only test if the return value is nonzero.
88 can fail for any of the reasons that
92 can fail; the cause of the error
95 or anywhere else, but indicates a
96 failure of the regex engine (but this case is indistinguishable from
97 that of an unrecognized value of
101 is not required by any standard, but
102 is available on a few other systems.
103 .\" It is available on at least AIX 5.1 and FreeBSD 6.0.
107 implementation looks at only the first character
110 As a consequence, "nyes" returns 0, and
111 "ynever; not in a million years" returns 1.
112 It would be preferable to accept input strings much more
113 strictly, for example (using the extended regular
114 expression notation described in
120 The following program displays the results when
122 is applied to the string given in the program's command-line argument.
132 main(int argc, char *argv[])
134 if (argc != 2 || strcmp(argv[1], "\-\-help") == 0) {
135 fprintf(stderr, "%s response\\n", argv[0]);
139 setlocale(LC_ALL, "");
140 printf("rpmatch() returns: %d\\n", rpmatch(argv[1]));