expose language check logic

1 files changed, 16 insertions, 0 deletions

diff --git a/src/include/taler_mhd_lib.h b/src/include/taler_mhd_lib.h
index 4b34f41df..7d281662d 100644
--- a/src/include/taler_mhd_lib.h
+++ b/src/include/taler_mhd_lib.h
@@ -97,6 +97,22 @@ TALER_MHD_can_compress (struct MHD_Connection *connection);
 
 
 /**
+ * Check if @a lang matches the @a language_pattern, and if so with
+ * which preference.
+ * See also: https://tools.ietf.org/html/rfc7231#section-5.3.1
+ *
+ * @param language_pattern a language preferences string
+ *        like "fr-CH, fr;q=0.9, en;q=0.8, *;q=0.1"
+ * @param lang the 2-digit language to match
+ * @return q-weight given for @a lang in @a language_pattern, 1.0 if no weights are given;
+ *         0 if @a lang is not in @a language_pattern
+ */
+double
+TALER_MHD_language_matches (const char *language_pattern,
+                            const char *lang);
+
+
+/**
  * Send JSON object as response.
  *
  * @param connection the MHD connection