From 5f2b09982312c98863eb9a8dfe2c608b81f58259 Mon Sep 17 00:00:00 2001 From: "Manuel A. Fernandez Montecelo" Date: Thu, 26 May 2016 16:48:15 +0100 Subject: Imported Upstream version 0.9.6 --- lib/unigbrk/u16-grapheme-prev.c | 54 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 lib/unigbrk/u16-grapheme-prev.c (limited to 'lib/unigbrk/u16-grapheme-prev.c') diff --git a/lib/unigbrk/u16-grapheme-prev.c b/lib/unigbrk/u16-grapheme-prev.c new file mode 100644 index 0000000..4b870fa --- /dev/null +++ b/lib/unigbrk/u16-grapheme-prev.c @@ -0,0 +1,54 @@ +/* Previous grapheme cluster function. + Copyright (C) 2010-2015 Free Software Foundation, Inc. + Written by Ben Pfaff , 2010. + + 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 . */ + +#include + +/* Specification. */ +#include "unigbrk.h" + +#include "unistr.h" + +const uint16_t * +u16_grapheme_prev (const uint16_t *s, const uint16_t *start) +{ + ucs4_t next; + + if (s == start) + return NULL; + + s = u16_prev (&next, s, start); + while (s != start) + { + const uint16_t *prev_s; + ucs4_t prev; + + prev_s = u16_prev (&prev, s, start); + if (prev_s == NULL) + { + /* Ill-formed UTF-16 encoding. */ + return start; + } + + if (uc_is_grapheme_break (prev, next)) + break; + + s = prev_s; + next = prev; + } + + return s; +} -- cgit v1.2.3