Move instance allocator to backend object, introduce backend start function

1 files changed, 79 insertions, 0 deletions

diff --git a/backend.c b/backend.c
index 673fe9b..1d728d1 100644
--- a/backend.c
+++ b/backend.c
@@ -4,6 +4,66 @@
 
 static size_t nbackends = 0;
 static backend* backends = NULL;
+static size_t ninstances = 0;
+static instance** instances = NULL;
+
+instance* mm_instance(){
+	instance** new_inst = realloc(instances, (ninstances + 1) * sizeof(instance*));
+	if(!new_inst){
+		//TODO free
+		fprintf(stderr, "Failed to allocate memory\n");
+		ninstances = 0;
+		return NULL;
+	}
+	instances = new_inst;
+	instances[ninstances] = calloc(1, sizeof(instance));
+	if(!instances[ninstances]){
+		fprintf(stderr, "Failed to allocate memory\n");
+		return NULL;
+	}
+
+	return instances[ninstances++];
+}
+
+int mm_backend_instances(char* name, size_t* ninst, instance*** inst){
+	backend* b = backend_match(name);
+	size_t n = 0, u;
+	//count number of affected instances
+	for(u = 0; u < ninstances; u++){
+		if(instances[u]->backend == b){
+			n++;
+		}
+	}
+
+	*ninst = n;
+	*inst = calloc(n, sizeof(instance*));
+	if(!*inst){
+		fprintf(stderr, "Failed to allocate memory\n");
+		return 1;
+	}
+
+	n = 0;
+	for(u = 0; u < ninstances; u++){
+		if(instances[u]->backend == b){
+			(*inst)[n] = instances[u];
+			n++;
+		}
+	}
+	return 0;
+}
+
+void instances_free(){
+	size_t u;
+	for(u = 0; u < ninstances; u++){
+		free(instances[u]->name);
+		instances[u]->name = NULL;
+		instances[u]->backend = NULL;
+		free(instances[u]);
+		instances[u] = NULL;
+	}
+	free(instances);
+	ninstances = 0;
+}
 
 backend* backend_match(char* name){
 	size_t u;
@@ -15,6 +75,16 @@ backend* backend_match(char* name){
 	return NULL;
 }
 
+instance* instance_match(char* name){
+	size_t u;
+	for(u = 0; u < ninstances; u++){
+		if(!strcmp(instances[u]->name, name)){
+			return instances[u];
+		}
+	}
+	return NULL;
+}
+
 int mm_backend_register(backend b){
 	if(!backend_match(b.name)){
 		backends = realloc(backends, (nbackends + 1) * sizeof(backend));
@@ -32,6 +102,15 @@ int mm_backend_register(backend b){
 	return 1;
 }
 
+int backends_start(){
+	int rv = 0;
+	size_t u;
+	for(u = 0; u < nbackends; u++){
+		rv |= backends[u].start();
+	}
+	return rv;
+}
+
 int backends_stop(){
 	size_t u;
 	for(u = 0; u < nbackends; u++){