refactor(socket/mime): change function sign

src/core/socket.c

@@ -3,21 +3,18 @@
 #include <errno.h>
 #include <sys/socket.h>
 
-size_t cws_socket_read(int sockfd, string_s *str) {
+ssize_t cws_socket_read(int sockfd, string_s *str) {
 	char tmp[4096] = {0};
 
-	size_t n = recv(sockfd, tmp, sizeof tmp, 0);
+	ssize_t n = recv(sockfd, tmp, sizeof tmp, 0);
 	if (n < 0) {
 		if (errno == EAGAIN || errno == EWOULDBLOCK) {
-			/* No data available right now */
 			return 0;
 		}
-
 		return -1;
 	}
 
 	if (n == 0) {
-		/* Connection closed */
 		return -1;
 	}
 
@@ -26,19 +23,17 @@ size_t cws_socket_read(int sockfd, string_s *str) {
 	return n;
 }
 
-size_t cws_socket_send(int sockfd, char *buffer, size_t len, int flags) {
+ssize_t cws_socket_send(int sockfd, const char *buffer, size_t len, int flags) {
 	size_t total_sent = 0;
-	size_t n;
+	ssize_t n;
 
 	while (total_sent < len) {
 		n = send(sockfd, buffer + total_sent, len - total_sent, flags);
 
 		if (n < 0) {
 			if (errno == EAGAIN || errno == EWOULDBLOCK) {
-				/* Buffer full, return bytes sent */
 				break;
 			}
-
 			return -1;
 		}