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author | Ludovic Courtès <ludo@gnu.org> | 2012-02-03 10:51:46 +0100 |
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committer | Ludovic Courtès <ludo@gnu.org> | 2012-02-03 10:51:46 +0100 |
commit | eb4a14ed47a34e03566261b02c77bfcc02b20134 (patch) | |
tree | 23d7e5a0df3aa502b1b5802a0e6c75cfbef87519 /lib/mbsinit.c | |
parent | 1ba05158ebe033d7d0bdfcfef686eae2c9ea0103 (diff) | |
download | guile-eb4a14ed47a34e03566261b02c77bfcc02b20134.tar.gz |
Use Gnulib's `regex' module.
This should help with regex portability, as reported in
<http://bugs.gnu.org/10684> for Darwin 8.11.
* m4/gnulib-cache.m4 (gl_MODULES): Add `regex'.
* configure.ac: Remove header checks for regex.h, rxposix.h, and
rx/rxposix.h. Remove check for the `regcomp' function. Remove
definition of `HAVE_REGCOMP'. Define `ENABLE_REGEX'.
* libguile/init.c: Check for `ENABLE_REGEX' instead of `HAVE_REGCOMP'.
* libguile/regex-posix.c: Always include <regex.h>. Remove #ifdefs for
rxposix.h and co.
Diffstat (limited to 'lib/mbsinit.c')
-rw-r--r-- | lib/mbsinit.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/lib/mbsinit.c b/lib/mbsinit.c new file mode 100644 index 000000000..79278d452 --- /dev/null +++ b/lib/mbsinit.c @@ -0,0 +1,61 @@ +/* Test for initial conversion state. + Copyright (C) 2008-2012 Free Software Foundation, Inc. + Written by Bruno Haible <bruno@clisp.org>, 2008. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +#include <config.h> + +/* Specification. */ +#include <wchar.h> + +#include "verify.h" + +#if (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__ + +/* On native Windows, 'mbstate_t' is defined as 'int'. */ + +int +mbsinit (const mbstate_t *ps) +{ + return ps == NULL || *ps == 0; +} + +#else + +/* Platforms that lack mbsinit() also lack mbrlen(), mbrtowc(), mbsrtowcs() + and wcrtomb(), wcsrtombs(). + We assume that + - sizeof (mbstate_t) >= 4, + - only stateless encodings are supported (such as UTF-8 and EUC-JP, but + not ISO-2022 variants), + - for each encoding, the number of bytes for a wide character is <= 4. + (This maximum is attained for UTF-8, GB18030, EUC-TW.) + We define the meaning of mbstate_t as follows: + - In mb -> wc direction, mbstate_t's first byte contains the number of + buffered bytes (in the range 0..3), followed by up to 3 buffered bytes. + - In wc -> mb direction, mbstate_t contains no information. In other + words, it is always in the initial state. */ + +verify (sizeof (mbstate_t) >= 4); + +int +mbsinit (const mbstate_t *ps) +{ + const char *pstate = (const char *)ps; + + return pstate == NULL || pstate[0] == 0; +} + +#endif |