common.h: cleanup, cont.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

src/c2.c

@@ -211,6 +211,26 @@ static const c2_predef_t C2_PREDEFS[] = {
     [C2_L_PROLE] = {"role", C2_L_TSTRING, 0},
 };
 
+/**
+ * Get the numeric property value from a win_prop_t.
+ */
+static inline long winprop_get_int(winprop_t prop) {
+	long tgt = 0;
+
+	if (!prop.nitems) {
+		return 0;
+	}
+
+	switch (prop.format) {
+	case 8: tgt = *(prop.p8); break;
+	case 16: tgt = *(prop.p16); break;
+	case 32: tgt = *(prop.p32); break;
+	default: assert(0); break;
+	}
+
+	return tgt;
+}
+
 /**
  * Compare next word in a string with another string.
  */