add rudimentary location support

The function dbfp_query_location_name performs the location.name query
and returns a list of all stations that match the search term.  The
implementation has two flaws:  there is no URL encoding, and
malformatted query results will not lead to a meaningful error message.

There are two new test cases:  basic tests some basic functionality, as
setting the API key and accessing the API.  location adds a simple test
for the location.name query.

1 files changed, 17 insertions, 1 deletions

diff --git a/dbfp.h b/dbfp.h
index 2efd5e1..7c786c7 100644
--- a/dbfp.h
+++ b/dbfp.h
@@ -7,13 +7,29 @@
 #ifndef DBFP_H_
 #define DBFP_H_
 
-#define DBFP_BASE_URL "http://open-api.bahn.de/bin/rest.exe"
+#include <stddef.h>
 
 struct dbfp {
 	char *key;
 };
 
+struct dbfp_status {
+	int error;
+	int run_error;
+	int parse_error;
+	int curl_error;
+	int api_error;
+};
+
+struct dbfp_location {
+	char *name;
+	char *id;
+};
+
 int dbfp_init(struct dbfp *dbfp, char *key);
 void dbfp_close(struct dbfp *dbfp);
 
+struct dbfp_status dbfp_query_location_name(struct dbfp *dbfp, char *input,
+		size_t *n, struct dbfp_location **out);
+
 #endif  /* DBFP_H_ */