Implement channel mapping

1 files changed, 53 insertions, 6 deletions

diff --git a/config.c b/config.c
index f425fe4..d3605e2 100644
--- a/config.c
+++ b/config.c
@@ -4,15 +4,15 @@
 #include "config.h"
 #include "backend.h"
 
-enum {
+static enum {
 	none,
 	backend_cfg,
 	instance_cfg,
 	map
 } parser_state = none;
 
-backend* current_backend = NULL;
-instance* current_instance = NULL;
+static backend* current_backend = NULL;
+static instance* current_instance = NULL;
 
 static char* config_trim_line(char* in){
 	ssize_t u;
@@ -28,6 +28,48 @@ static char* config_trim_line(char* in){
 	return in;
 }
 
+static int config_map(char* to, char* from){
+	char* chanspec_to = to, *chanspec_from = from;
+	instance* instance_to = NULL, *instance_from = NULL;
+	channel* channel_from = NULL, *channel_to = NULL;
+
+	//separate channel spec from instance
+	for(; *chanspec_to && *chanspec_to != '.'; chanspec_to++){
+	}
+
+	for(; *chanspec_from && *chanspec_from != '.'; chanspec_from++){
+	}
+
+	if(!*chanspec_to || !*chanspec_from){
+		fprintf(stderr, "Mapping does not contain a proper instance specification\n");
+		return 1;
+	}
+
+	//terminate
+	*chanspec_to = *chanspec_from = 0;
+	chanspec_to++;
+	chanspec_from++;
+
+	//find matching instances
+	instance_to = instance_match(to);
+	instance_from = instance_match(from);
+
+	if(!instance_to || !instance_from){
+		fprintf(stderr, "No such instance %s\n", instance_from ? to : from);
+		return 1;
+	}
+
+	channel_from = instance_from->backend->channel(instance_from, chanspec_from);
+	channel_to = instance_to->backend->channel(instance_to, chanspec_to);
+
+	if(!channel_from || !channel_to){
+		fprintf(stderr, "Failed to parse channel specifications\n");
+		return 1;
+	}
+
+	return mm_map_channel(channel_from, channel_to);
+}
+
 int config_read(char* cfg_file){
 	int rv = 1;
 	size_t line_alloc = 0;
@@ -114,17 +156,22 @@ int config_read(char* cfg_file){
 
 			*separator = 0;
 			separator++;
+			line = config_trim_line(line);
+			separator = config_trim_line(separator);
 
-			if(parser_state == backend_cfg && current_backend->conf(config_trim_line(line), config_trim_line(separator))){
+			if(parser_state == backend_cfg && current_backend->conf(line, separator)){
 				fprintf(stderr, "Failed to configure backend %s\n", current_backend->name);
 				goto bail;
 			}
-			else if(parser_state == instance_cfg && current_backend->conf_instance(current_instance, config_trim_line(line), config_trim_line(separator))){
+			else if(parser_state == instance_cfg && current_backend->conf_instance(current_instance, line, separator)){
 				fprintf(stderr, "Failed to configure instance %s\n", current_instance->name);
 				goto bail;
 			}
 			else if(parser_state == map){
-				//TODO map two channels
+				if(config_map(line, separator)){
+					fprintf(stderr, "Failed to map channel\n");
+					goto bail;
+				}
 			}
 		}
 	}