summaryrefslogtreecommitdiff
path: root/lib/unistr/u8-uctomb-aux.c
diff options
context:
space:
mode:
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/unistr/u8-uctomb-aux.c
Imported Upstream version 0.9.1upstream/0.9.1
Diffstat (limited to 'lib/unistr/u8-uctomb-aux.c')
-rw-r--r--lib/unistr/u8-uctomb-aux.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/lib/unistr/u8-uctomb-aux.c b/lib/unistr/u8-uctomb-aux.c
new file mode 100644
index 00000000..c42fa501
--- /dev/null
+++ b/lib/unistr/u8-uctomb-aux.c
@@ -0,0 +1,69 @@
+/* Conversion UCS-4 to UTF-8.
+ Copyright (C) 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"
+
+int
+u8_uctomb_aux (uint8_t *s, ucs4_t uc, int n)
+{
+ int count;
+
+ if (uc < 0x80)
+ /* The case n >= 1 is already handled by the caller. */
+ return -2;
+ else if (uc < 0x800)
+ count = 2;
+ else if (uc < 0x10000)
+ {
+ if (uc < 0xd800 || uc >= 0xe000)
+ count = 3;
+ else
+ return -1;
+ }
+#if 0
+ else if (uc < 0x200000)
+ count = 4;
+ else if (uc < 0x4000000)
+ count = 5;
+ else if (uc <= 0x7fffffff)
+ count = 6;
+#else
+ else if (uc < 0x110000)
+ count = 4;
+#endif
+ else
+ return -1;
+
+ if (n < count)
+ return -2;
+
+ switch (count) /* note: code falls through cases! */
+ {
+#if 0
+ case 6: s[5] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x4000000;
+ case 5: s[4] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x200000;
+#endif
+ case 4: s[3] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x10000;
+ case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800;
+ case 2: s[1] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0xc0;
+ /*case 1:*/ s[0] = uc;
+ }
+ return count;
+}