- fix bug

newlib/examples/mshell.c

@@ -42,13 +42,15 @@ int main(int argc, char** argv)
 {
 	char* command = malloc(1024*sizeof(char));
 
-	int size, status = 0;
+	int size = 0, status = 0;
 	pid_t pid;
 	system("clear");
 	showlogo();
 	while(1) {
 		printf("$ ");
-		size = scanf("%s", command);
+		do {
+			size = scanf("%s", command);
+		} while(size <= 0);
 		if(!strcmp(command, "exit")) {
 			return 0;
 		}