M xyw.c → xyw.c

@@ -51,10 +51,10 @@ }
 
         const char *input_file = argv[i];
         char output_file[256];
-        snprintf(output_file, sizeof(output_file), "%.*s.xim", (int)(strlen(input_file) - 4), input_file);
         const char *ext = strrchr(input_file, '.');
         if (ext && strcmp(ext, ".xyw") == 0)
         {
+            snprintf(output_file, sizeof(output_file), "%.*s.xim", (int)(ext - input_file), input_file);
             if (xyw_assemble(input_file, output_file) != 0)
             {
                 fprintf(stderr, "Assembly failed for file: %s\n", input_file);