bytestring: Implement bytestring_bytestring()

[ccan] / ccan / bytestring / bytestring.h

diff --git a/ccan/bytestring/bytestring.h b/ccan/bytestring/bytestring.h
index 042b1843220192bd1c4d2614cdd75df303812bc0..62141bea41149a30bd61214e8804d50c23e4c971 100644 (file)
--- a/ccan/bytestring/bytestring.h
+++ b/ccan/bytestring/bytestring.h
@@ -181,4 +181,23 @@ static inline const char *bytestring_rindex(struct bytestring haystack,
        return memrchr(haystack.ptr, needle, haystack.len);
 }
 
+/*
+ * bytestring_bytestring - search for a bytestring in another bytestring
+ * @haystack, @needle: bytestrings
+ *
+ * Returns a bytestring corresponding to the first occurrence of
+ * @needle in @haystack, or bytestring_NULL if @needle is not found
+ * within @haystack.
+ */
+static inline struct bytestring bytestring_bytestring(struct bytestring haystack,
+                                                     struct bytestring needle)
+{
+       const char *p = memmem(haystack.ptr, haystack.len,
+                              needle.ptr, needle.len);
+       if (p)
+               return bytestring(p, needle.len);
+       else
+               return bytestring_NULL;
+}
+
 #endif /* CCAN_BYTESTRING_H_ */