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-rw-r--r--lib/unistr/u16-uctomb-aux.c58
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diff --git a/lib/unistr/u16-uctomb-aux.c b/lib/unistr/u16-uctomb-aux.c
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+/* Conversion UCS-4 to UTF-16.
+ 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
+u16_uctomb_aux (uint16_t *s, ucs4_t uc, int n)
+{
+ if (uc < 0xd800)
+ {
+ /* The case n >= 1 is already handled by the caller. */
+ }
+ else if (uc < 0x10000)
+ {
+ if (uc >= 0xe000)
+ {
+ if (n >= 1)
+ {
+ s[0] = uc;
+ return 1;
+ }
+ }
+ else
+ return -1;
+ }
+ else
+ {
+ if (uc < 0x110000)
+ {
+ if (n >= 2)
+ {
+ s[0] = 0xd800 + ((uc - 0x10000) >> 10);
+ s[1] = 0xdc00 + ((uc - 0x10000) & 0x3ff);
+ return 2;
+ }
+ }
+ else
+ return -1;
+ }
+ return -2;
+}