+/**
+ * bytestring_splitchrs_first - split a bytestring on a set of delimiter
+ * characters
+ * @whole: a bytestring
+ * @delim: delimiter characters
+ *
+ * Returns the first substring of @whole delimited by any character in
+ * @delim.
+ */
+struct bytestring bytestring_splitchrs_first(struct bytestring whole,
+ struct bytestring delim);
+
+/**
+ * bytestring_splitchr_next - split a bytestring on a set of delimiter
+ * characters
+ * @whole: a bytestring
+ * @delim: delimiter character
+ * @prev: last substring
+ *
+ * Returns the next @delim delimited substring of @whole after @prev.
+ */
+struct bytestring bytestring_splitchrs_next(struct bytestring whole,
+ struct bytestring delim,
+ struct bytestring prev);
+
+#define bytestring_foreach_splitchrs(_s, _w, _delim) \
+ for ((_s) = bytestring_splitchrs_first((_w), (_delim)); \
+ (_s).ptr; \
+ (_s) = bytestring_splitchrs_next((_w), (_delim), (_s)))
+
+/**
+ * bytestring_splitstr_first - split a bytestring on a delimiter string
+ * @whole: a bytestring
+ * @delim: delimiter substring
+ *
+ * Returns the first substring of @whole delimited by the substring in
+ * @delim.
+ */
+struct bytestring bytestring_splitstr_first(struct bytestring whole,
+ struct bytestring delim);
+
+/**
+ * bytestring_splitstr_next - split a bytestring on a delimiter string
+ * @whole: a bytestring
+ * @delim: delimiter string
+ * @prev: last substring
+ *
+ * Returns the next @delim delimited substring of @whole after @prev.
+ */
+struct bytestring bytestring_splitstr_next(struct bytestring whole,
+ struct bytestring delim,
+ struct bytestring prev);
+
+#define bytestring_foreach_splitstr(_s, _w, _delim) \
+ for ((_s) = bytestring_splitstr_first((_w), (_delim)); \
+ (_s).ptr; \
+ (_s) = bytestring_splitstr_next((_w), (_delim), (_s)))
+