X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Fbytestring%2Fbytestring.h;fp=ccan%2Fbytestring%2Fbytestring.h;h=62141bea41149a30bd61214e8804d50c23e4c971;hp=042b1843220192bd1c4d2614cdd75df303812bc0;hb=f1e31c66572ef5997e08a1ecadf2e45b2fb04532;hpb=d584928758cb995a60e8264b73da46bcd8c410ca

diff --git a/ccan/bytestring/bytestring.h b/ccan/bytestring/bytestring.h
index 042b1843..62141bea 100644
--- 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_ */