Mercurial > gnulib
view lib/unistr/u16-strrchr.c @ 17249:e542fd46ad6f
maint: update all copyright year number ranges
Run "make update-copyright". Compare to commit 1602f0a from last year.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 01 Jan 2013 00:50:58 +0000 |
parents | 8250f2777afc |
children | 344018b6e5d7 |
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/* Search character in UTF-16 string. Copyright (C) 1999, 2002, 2006-2007, 2009-2013 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_strrchr (const uint16_t *s, ucs4_t uc) { /* Calling u16_strlen and then searching from the other end would cause more memory accesses. Avoid that, at the cost of a few more comparisons. */ uint16_t *result = NULL; uint16_t c[2]; if (uc < 0x10000) { uint16_t c0 = uc; for (;; s++) { if (*s == c0) result = (uint16_t *) s; if (*s == 0) break; } } else switch (u16_uctomb_aux (c, uc, 2)) { case 2: if (*s) { uint16_t c0 = c[0]; uint16_t c1 = c[1]; /* FIXME: Maybe walking the string via u16_mblen is a win? */ for (;; s++) { if (s[1] == 0) break; if (*s == c0 && s[1] == c1) result = (uint16_t *) s; } } break; } return result; }