1 /* Determine whether string value is affirmation or negative response
2 according to current locale's data.
3 This file is part of the GNU C Library.
4 Copyright (C) 1996-2017 Free Software Foundation, Inc.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
25 /* Match against one of the response patterns, compiling the pattern
26 first if necessary. */
28 try (const char *response
,
29 const int tag
, const int match
, const int nomatch
,
30 const char **lastp
, regex_t
*re
)
32 const char *pattern
= nl_langinfo (tag
);
33 if (pattern
!= *lastp
)
35 /* The pattern has changed. */
38 /* Free the old compiled pattern. */
42 /* Compile the pattern and cache it for future runs. */
43 if (__regcomp (re
, pattern
, REG_EXTENDED
) != 0)
48 /* Try the pattern. */
49 return __regexec (re
, response
, 0, NULL
, 0) == 0 ? match
: nomatch
;
53 rpmatch (const char *response
)
55 /* We cache the response patterns and compiled regexps here. */
56 static const char *yesexpr
, *noexpr
;
57 static regex_t yesre
, nore
;
59 return (try (response
, YESEXPR
, 1, 0, &yesexpr
, &yesre
) ?:
60 try (response
, NOEXPR
, 0, -1, &noexpr
, &nore
));