1 files changed, 81 insertions, 0 deletions
diff --git a/lib/unistring/unistr/u16-uctomb.c b/lib/unistring/unistr/u16-uctomb.c
new file mode 100644
index 0000000..2a009d0
--- /dev/null
+++ b/lib/unistring/unistr/u16-uctomb.c
@@ -0,0 +1,81 @@
+/* Store a character in UTF-16 string.
+   Copyright (C) 2002, 2005-2006, 2009-2021 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 either:
+
+     * 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.
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at your
+       option) any later version.
+
+   or both in parallel, as here.
+   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 <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#if defined IN_LIBUNISTRING
+/* Tell unistr.h to declare u16_uctomb as 'extern', not 'static inline'.  */
+# include "unistring-notinline.h"
+#endif
+
+/* Specification.  */
+#include "unistr.h"
+
+#if !HAVE_INLINE
+
+int
+u16_uctomb (uint16_t *s, ucs4_t uc, ptrdiff_t n)
+{
+  if (uc < 0xd800)
+    {
+      if (n > 0)
+        {
+          s[0] = uc;
+          return 1;
+        }
+      /* else return -2, below.  */
+    }
+  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;
+}
+
+#endif