1 files changed, 36 insertions, 0 deletions
diff --git a/src/wchar/wcsnlen.c b/src/wchar/wcsnlen.c
new file mode 100644
index 0000000..a094d28
--- /dev/null
+++ b/src/wchar/wcsnlen.c
@@ -0,0 +1,36 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+#include <wchar.h>
+
+
+
+/**
+ * `wchar_t` version of `strnlen`.
+ * 
+ * @param   str     The string.
+ * @param   maxlen  The number of bytes to inspect, at most.
+ * @return          The number of `wchar_t`:s before the
+ *                  first NUL character. `maxlen` if no
+ *                  NUL character was found.
+ */
+size_t wcsnlen(const wchar_t* str, size_t maxlen)
+{
+  const wchar_t* end = wmemchr(str, 0, maxlen);
+  return end == NULL ? maxlen : (size_t)(end - str);
+}
+