diff options
author | Bruno Haible <bruno@clisp.org> | 2007-03-28 21:36:46 +0000 |
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committer | Bruno Haible <bruno@clisp.org> | 2007-03-28 21:36:46 +0000 |
commit | 3dbf6525d4f1ce23b2e4d0323a03a39db6523673 (patch) | |
tree | 4a98dcf3be05edc9e7f94499096f21d1f15e3e76 /lib | |
parent | 196cafbf5d97fd724017b3cc19c70f71b1c1a98e (diff) | |
download | gnulib-3dbf6525d4f1ce23b2e4d0323a03a39db6523673.tar.gz |
New module 'unistr/u16-mbtoucr'.
Diffstat (limited to 'lib')
-rw-r--r-- | lib/unistr/u16-mbtoucr.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/lib/unistr/u16-mbtoucr.c b/lib/unistr/u16-mbtoucr.c new file mode 100644 index 0000000000..85018dbc52 --- /dev/null +++ b/lib/unistr/u16-mbtoucr.c @@ -0,0 +1,56 @@ +/* Look at first character in UTF-16 string, returning an error code. + Copyright (C) 1999-2002, 2006-2007 Free Software Foundation, Inc. + Written by Bruno Haible <bruno@clisp.org>, 2001. + + This program is free software; you can redistribute it and/or modify it + under the terms of the GNU Library General Public License as published + by the Free Software Foundation; either version 2, 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + USA. */ + +#include <config.h> + +/* Specification. */ +#include "unistr.h" + +int +u16_mbtoucr (ucs4_t *puc, const uint16_t *s, size_t n) +{ + uint16_t c = *s; + + if (c < 0xd800 || c >= 0xe000) + { + *puc = c; + return 1; + } + if (c < 0xdc00) + { + if (n >= 2) + { + if (s[1] >= 0xdc00 && s[1] < 0xe000) + { + *puc = 0x10000 + ((c - 0xd800) << 10) + (s[1] - 0xdc00); + return 2; + } + /* invalid multibyte character */ + } + else + { + /* incomplete multibyte character */ + *puc = 0xfffd; + return -2; + } + } + /* invalid multibyte character */ + *puc = 0xfffd; + return -1; +} |