mem: Add function to check whether memory ranges overlap

[ccan] / ccan / mem / mem.h

diff --git a/ccan/mem/mem.h b/ccan/mem/mem.h
index 1afe508b3a097beefdbf93660165c7146fdb3f25..99c34c0a39719ec0a262add21e74bab5b99a8e56 100644 (file)
--- a/ccan/mem/mem.h
+++ b/ccan/mem/mem.h
@@ -200,4 +200,21 @@ static inline bool memends_str(const void *a, size_t al, const char *s)
        return memends(a, al, s, strlen(s));
 }
 
+/**
+ * memoverlaps - Do two memory ranges overlap?
+ * @a: pointer to first memory range
+ * @al: length of first memory range
+ * @b: pointer to second memory range
+ * @al: length of second memory range
+ */
+CONST_FUNCTION
+static inline bool memoverlaps(const void *a_, size_t al,
+                              const void *b_, size_t bl)
+{
+       const char *a = a_;
+       const char *b = b_;
+
+       return (a < (b + bl)) && (b < (a + al));
+}
+
 #endif /* CCAN_MEM_H */