Add utility function for processing a string buffer by line

src/string_func_extra.h

@@ -20,4 +20,21 @@ static inline void str_validate(std::string &str, StringValidationSettings setti
 	str.resize(str_validate_intl(buf, buf + str.size(), settings) - buf);
 }
 
+template <typename F>
+inline void ProcessLineByLine(char *buf, F line_functor)
+{
+	char *p = buf;
+	char *p2 = buf;
+	/* Print output line by line */
+	for (; *p2 != '\0'; p2++) {
+		if (*p2 == '\n') {
+			*p2 = '\0';
+			line_functor(p);
+			p = p2 + 1;
+		}
+	}
+	if (p < p2) line_functor(p);
+}
+
+
 #endif /* STRING_FUNC_EXTRA_H */