diff options
Diffstat (limited to 'lib/unistr/u16-chr.c')
-rw-r--r-- | lib/unistr/u16-chr.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/lib/unistr/u16-chr.c b/lib/unistr/u16-chr.c new file mode 100644 index 0000000..2d7d797 --- /dev/null +++ b/lib/unistr/u16-chr.c @@ -0,0 +1,56 @@ +/* Search character in piece of UTF-16 string. + Copyright (C) 1999, 2002, 2006-2007 Free Software Foundation, Inc. + Written by Bruno Haible <bruno@clisp.org>, 2002. + + 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 "unistr.h" + +uint16_t * +u16_chr (const uint16_t *s, size_t n, ucs4_t uc) +{ + uint16_t c[2]; + + if (uc < 0x10000) + { + uint16_t c0 = uc; + + for (; n > 0; s++, n--) + { + if (*s == c0) + return (uint16_t *) s; + } + } + else + switch (u16_uctomb_aux (c, uc, 2)) + { + case 2: + if (n > 1) + { + uint16_t c0 = c[0]; + uint16_t c1 = c[1]; + + for (n--; n > 0; s++, n--) + { + if (*s == c0 && s[1] == c1) + return (uint16_t *) s; + } + } + break; + } + return NULL; +} |