refactor(error): add error messages

include/utils/error.h

@@ -9,20 +9,21 @@ typedef enum cws_server_ret {
 	CWS_SERVER_EPOLL_CREATE_ERROR,
 	CWS_SERVER_CLIENT_DISCONNECTED_ERROR,
 	CWS_SERVER_HTTP_PARSE_ERROR,
-	CWS_SERVER_CONFIG,
+	CWS_SERVER_CONFIG_ERROR,
 	CWS_SERVER_GETADDRINFO_ERROR,
 	CWS_SERVER_SOCKET_ERROR,
 	CWS_SERVER_SETSOCKOPT_ERROR,
 	CWS_SERVER_BIND_ERROR,
 	CWS_SERVER_LISTEN_ERROR,
 	CWS_SERVER_WORKER_ERROR,
+	CWS_SERVER_UNKNOWN_ERROR,
 } cws_server_ret;
 
 typedef struct cws_error {
 	cws_server_ret code;
-	char *str;
+	char *msg;
 } cws_error_s;
 
-char *cws_error_str(cws_server_ret code);
+const char *cws_error_str(cws_server_ret code);
 
 #endif

src/utils/error.c

@@ -2,15 +2,25 @@
 
 #include <stddef.h>
 
-/* @TODO: complete this array */
-static cws_error_s errors[] = {{CWS_SERVER_OK, "No error found"}};
+static const cws_error_s errors[] = {
+	{CWS_SERVER_OK, "No error"},
+	{CWS_SERVER_FD_NONBLOCKING_ERROR, "Failed to set socket as non-blocking"},
+	{CWS_SERVER_EPOLL_CREATE_ERROR, "Failed to create epoll instance"},
+	{CWS_SERVER_CLIENT_DISCONNECTED_ERROR, "Client disconnected"},
+	{CWS_SERVER_HTTP_PARSE_ERROR, "Failed to parse HTTP request"},
+	{CWS_SERVER_CONFIG_ERROR, "Invalid server configuration"},
+	{CWS_SERVER_GETADDRINFO_ERROR, "getaddrinfo() failed"},
+	{CWS_SERVER_SOCKET_ERROR, "Failed to create socket"},
+	{CWS_SERVER_SETSOCKOPT_ERROR, "setsockopt() failed"},
+	{CWS_SERVER_BIND_ERROR, "bind() failed"},
+	{CWS_SERVER_LISTEN_ERROR, "listen() failed"},
+	{CWS_SERVER_WORKER_ERROR, "Worker thread initialization failed"},
+	{CWS_SERVER_UNKNOWN_ERROR, "Unknown error"}};
 
-char *cws_error_str(cws_server_ret code) {
-	for (unsigned long i = 0; i < ARR_SIZE(errors); ++i) {
-		if (errors[i].code == code) {
-			return errors[i].str;
-		}
+const char *cws_error_str(cws_server_ret code) {
+	for (size_t i = 0; i < ARR_SIZE(errors); ++i) {
+		if (errors[i].code == code)
+			return errors[i].msg;
 	}
-
-	return NULL;
+	return "Unrecognized error code";
 }