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authorAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
committerAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
commitfa095a4504cbe668e4244547e2c141597bea4ecf (patch)
tree06135820a286ffec47804e75fbf8a147e92acd2e /lib/uniwidth/u8-width.c
Imported Upstream version 0.9.1upstream/0.9.1
Diffstat (limited to 'lib/uniwidth/u8-width.c')
-rw-r--r--lib/uniwidth/u8-width.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/lib/uniwidth/u8-width.c b/lib/uniwidth/u8-width.c
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+++ b/lib/uniwidth/u8-width.c
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+/* Determine display width of UTF-8 string.
+ Copyright (C) 2001-2002, 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 "uniwidth.h"
+
+#include "unistr.h"
+
+int
+u8_width (const uint8_t *s, size_t n, const char *encoding)
+{
+ const uint8_t *s_end = s + n;
+ int width = 0;
+
+ while (s < s_end)
+ {
+ ucs4_t uc;
+ int w;
+
+ s += u8_mbtouc_unsafe (&uc, s, s_end - s);
+
+ if (uc == 0)
+ break; /* end of string reached */
+
+ w = uc_width (uc, encoding);
+ if (w >= 0) /* ignore control characters in the string */
+ width += w;
+ }
+
+ return width;
+}