utils: Add helper function to check a string for a given prefix

src/libstrongswan/utils/utils.h

@@ -88,6 +88,14 @@ static inline bool strneq(const char *x, const char *y, size_t len)
 	return strncmp(x, y, len) == 0;
 }
 
+/**
+ * Helper function that checks if a string starts with a given prefix
+ */
+static inline bool strpfx(const char *x, const char *prefix)
+{
+	return strneq(x, prefix, strlen(prefix));
+}
+
 /**
  * Helper function that compares two strings for equality ignoring case
  */