Add function to count element in arrays.

libc/inc/stddef.h

@@ -68,3 +68,6 @@ typedef unsigned int pgprot_t;
 /// Returns the alignment, in bytes, of the specified type.
 #define alignof(type) offsetof( \
     struct { char c; type member; }, member)
+
+/// Counts the number of elements of an array.
+#define count_of(x) ((sizeof(x) / sizeof((x)[0])) / ((size_t)(!(sizeof(x) % sizeof((x)[0])))))

mentos/src/io/vga/vga.c

@@ -20,9 +20,6 @@
 #include "string.h"
 #include "math.h"
 
-/// Counts the number of elements of an array.
-#define COUNT_OF(x) ((sizeof(x) / sizeof(0 [x])) / ((size_t)(!(sizeof(x) % sizeof(0 [x])))))
-
 /// Attribute Controller index port.
 #define AC_INDEX 0x03C0
 /// Attribute Controller write port.