add memcasecmp and wmemcasecmp

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/wchar.h b/include/wchar.h
index 755b583..2b757ca 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -658,6 +658,23 @@ wchar_t* wmemdup(const wchar_t*, size_t)
 int wmemcmp(const wchar_t*, const wchar_t*, size_t)
   __GCC_ONLY(__attribute__((warn_unused_result, pure)));
 
+#if defined(_SLIBC_SOURCE) && !defined(__PORTABLE)
+/**
+ * Compare two memory segments alphabetically in a case insensitive manner.
+ * 
+ * This is a slibc extension added because it was useful
+ * in implementing slibc itself.
+ * 
+ * @param   a     A negative value is returned if this is the lesser.
+ * @param   b     A positive value is returned if this is the lesser.
+ * @param   size  The size of the segments.
+ * @return        Zero is returned if `a` and `b` are equal, otherwise,
+ *                see the specifications for `a` and `b`.
+ */
+int wmemcasecmp(const wchar_t*, const wchar_t*, size_t)
+  __GCC_ONLY(__attribute__((warn_unused_result, pure)));
+#endif
+
 /**
  * Compare two strings alphabetically in a case sensitive manner.
  *