+ if (!(flag & MERGE_FORCE) && strcmp(argv[optind], "-")) {
+ FILE *fp = fopen(argv[optind], "rb");
+ if (fp != NULL) {
+ fclose(fp);
+ fprintf(stderr, "[%s] File '%s' exists. Please apply '-f' to overwrite. Abort.\n", __func__, argv[optind]);
+ return 1;
+ }
+ }