1 files changed, 38 insertions, 0 deletions
diff --git a/lib/unistr/u32-strrchr.c b/lib/unistr/u32-strrchr.c
new file mode 100644
index 00000000..b4641f33
--- /dev/null
+++ b/lib/unistr/u32-strrchr.c
@@ -0,0 +1,38 @@
+/* Search character in UTF-32 string.
+   Copyright (C) 1999, 2002, 2006 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"
+
+uint32_t *
+u32_strrchr (const uint32_t *s, ucs4_t uc)
+{
+  /* Calling u32_strlen and then searching from the other end would cause more
+     memory accesses. Avoid that, at the cost of a few more comparisons.  */
+  uint32_t *result = NULL;
+
+  for (;; s++)
+    {
+      if (*s == uc)
+	result = (uint32_t *) s;
+      if (*s == 0)
+	break;
+    }
+  return result;
+}