1 files changed, 79 insertions, 0 deletions
diff --git a/lib/unistr/u8-uctomb.c b/lib/unistr/u8-uctomb.c
new file mode 100644
index 0000000..e356269
--- /dev/null
+++ b/lib/unistr/u8-uctomb.c
@@ -0,0 +1,79 @@
+/* Store a character in UTF-8 string.
+   Copyright (C) 2002, 2005-2006, 2009-2020 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 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
+   General Public License for more details.
+
+   You should have received a copy of the GNU 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 u8_uctomb as 'extern', not 'static inline'.  */
+# include "unistring-notinline.h"
+#endif
+
+/* Specification.  */
+#include "unistr.h"
+
+#include "attribute.h"
+
+#if !HAVE_INLINE
+
+int
+u8_uctomb (uint8_t *s, ucs4_t uc, ptrdiff_t n)
+{
+  if (uc < 0x80)
+    {
+      if (n > 0)
+        {
+          s[0] = uc;
+          return 1;
+        }
+      /* else return -2, below.  */
+    }
+  else
+    {
+      int count;
+
+      if (uc < 0x800)
+        count = 2;
+      else if (uc < 0x10000)
+        {
+          if (uc < 0xd800 || uc >= 0xe000)
+            count = 3;
+          else
+            return -1;
+        }
+      else if (uc < 0x110000)
+        count = 4;
+      else
+        return -1;
+
+      if (n >= count)
+        {
+          switch (count) /* note: code falls through cases! */
+            {
+            case 4: s[3] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x10000;
+              FALLTHROUGH;
+            case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800;
+              FALLTHROUGH;
+            case 2: s[1] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0xc0;
+          /*case 1:*/ s[0] = uc;
+            }
+          return count;
+        }
+    }
+  return -2;
+}
+
+#endif