- } else f_dst = fileno(stdout);
- fp = (argc == optind)? bgzf_fdopen(fileno(stdin), "r") : bgzf_open(argv[optind], "r");
- if (fp == NULL) {
- fprintf(stderr, "[bgzip] Could not open file: %s\n", argv[optind]);
- return 1;
+ }
+ else if (!pstdout && isatty(fileno((FILE *)stdin)) )
+ return bgzip_main_usage();
+ else
+ {
+ f_dst = fileno(stdout);
+ fp = bgzf_fdopen(fileno(stdin), "r");
+ if (fp == NULL) {
+ fprintf(stderr, "[bgzip] Could not read from stdin: %s\n", strerror(errno));
+ return 1;
+ }