shl: misc: add SHL_HAS_BITS() helper

This helper checks whether a bitmask has all the given bits set.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

src/shl_misc.h

@@ -38,6 +38,8 @@
 #include <stdlib.h>
 #include <xkbcommon/xkbcommon.h>
 
+#define SHL_HAS_BITS(_bitmask, _bits) (((_bitmask) & (_bits)) == (_bits))
+
 static inline int shl_strtou(const char *input, unsigned int *output)
 {
 	unsigned long val;