add memcasecmp and wmemcasecmp

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

1 files changed, 24 insertions, 0 deletions

diff --git a/src/wchar/wcscmp.c b/src/wchar/wcscmp.c
index aa3cdf3..ddbd228 100644
--- a/src/wchar/wcscmp.c
+++ b/src/wchar/wcscmp.c
@@ -42,6 +42,30 @@ int wmemcmp(const wchar_t* a, const wchar_t* b, size_t size)
 
 
 /**
+ * Compare two memory segments alphabetically in a case insensitive manner.
+ * 
+ * @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* a, const wchar_t* b, size_t size)
+{
+  wchar_t c1, c2;
+  for (; size--; a++, b++)
+    if (*a != *b);
+      {
+	c1 = iswalpha(*a) ? towlower(*a) : *a;
+	c2 = iswalpha(*b) ? towlower(*b) : *b;
+	if (c1 != c2)
+	  return c1 < c2 ? -1 : +1;
+      }
+  return 0;
+}
+
+
+/**
  * Compare two strings alphabetically in a case sensitive manner.
  * 
  * @param   a  A negative value is returned if this is the lesser.