Added ability to parse out peer id

include/multiaddr/multiaddr.h

@@ -80,4 +80,11 @@ int multiaddress_get_ip_address(const struct MultiAddress* in, char** ip);
  */
 int multiaddress_get_ip_port(const struct MultiAddress* in);
 
+/**
+ * Pulls the peer ID out of a multiaddress struct
+ * @param in the MultiAddress
+ * @returns a pointer to the peer id string, or NULL
+ */
+char* multiaddress_get_peer_id(const struct MultiAddress* in);
+
 #endif

multiaddr.c

@@ -129,7 +129,7 @@ int multiaddress_get_ip_address(const struct MultiAddress* in, char** ip) {
 	*ip = malloc(strlen(str) + 1);
 	strcpy(*ip, str);
 	free(str);
-	return 0;
+	return 1;
 }
 
 /***
@@ -155,6 +155,13 @@ int multiaddress_get_ip_port(const struct MultiAddress* in) {
 	return atoi(str);
 }
 
+char* multiaddress_get_peer_id(const struct MultiAddress* in) {
+	char* ptr = strstr(in->string, "/ipfs/");
+	if (ptr == NULL)
+		return NULL;
+	return &ptr[6];
+}
+
 void multiaddress_free(struct MultiAddress* in) {
 	if (in != NULL) {
 		if (in->bytes != NULL)
@@ -169,8 +176,7 @@ void multiaddress_free(struct MultiAddress* in) {
 /**
  * Copy a multiaddress from one memory location to another
  * @param in the source
- * @param out the destination. NOTE: memory for out should be preallocated
- * @returns true(1) on success, otherwise false(0)
+ * @returns the new struct MultiAddress or NULL if there was a problem (i.e. out of memory)
  */
 struct MultiAddress* multiaddress_copy(const struct MultiAddress* in) {
 	struct MultiAddress* out = NULL;

test_multiaddr.h

@@ -92,3 +92,26 @@ int test_multiaddr_utils() {
 	return 1;
 }
 
+int test_multiaddr_peer_id() {
+	char* orig_address = "QmKhhKHkjhkjhKjhiuhKJh";
+	char full_string[255];
+	char* result = NULL;
+	int retVal = 0;
+	struct MultiAddress* addr;
+
+	sprintf(full_string, "/ip4/127.0.0.1/tcp/4001/ipfs/%s", orig_address);
+
+	addr = multiaddress_new_from_string(full_string);
+
+	result = multiaddress_get_peer_id(addr);
+
+	if (result == NULL || strncmp(result, orig_address, strlen(orig_address)) != 0)
+		goto exit;
+
+	retVal = 1;
+	exit:
+	if (addr != NULL)
+		multiaddress_free(addr);
+	return retVal;
+}
+

testing.c

@@ -7,7 +7,8 @@ const char* names[] = {
 		"test_full",
 		"test_hex_to_var",
 		"test_int_to_hex",
-		"test_multiaddr_utils"
+		"test_multiaddr_utils",
+		"test_multiaddr_peer_id"
 };
 
 int (*funcs[])(void) = {
@@ -15,7 +16,8 @@ int (*funcs[])(void) = {
 		test_full,
 		test_hex_to_var,
 		test_int_to_hex,
-		test_multiaddr_utils
+		test_multiaddr_utils,
+		test_multiaddr_peer_id
 };
 
 int testit(const char* name, int (*func)(void)) {