diff options
Diffstat (limited to 'gzip.c')
| -rw-r--r-- | gzip.c | 18 |
1 files changed, 16 insertions, 2 deletions
@@ -1801,6 +1801,7 @@ int gzip_main(int argc, char **argv) char *delFileName; int tostdout = 0; int fromstdin = 0; + int force = 0; if (argc == 1) usage(gzip_usage); @@ -1808,7 +1809,6 @@ int gzip_main(int argc, char **argv) /* Parse any options */ while (--argc > 0 && **(++argv) == '-') { if (*((*argv) + 1) == '\0') { - fromstdin = 1; tostdout = 1; } while (*(++(*argv))) { @@ -1816,11 +1816,25 @@ int gzip_main(int argc, char **argv) case 'c': tostdout = 1; break; + case 'f': + force = 1; + break; + /* Ignore 1-9 (compression level) options */ + case '1': case '2': case '3': case '4': case '5': + case '6': case '7': case '8': case '9': + break; default: usage(gzip_usage); } } } + if (argc <= 0) + fromstdin = 1; + + if (isatty(fileno(stdin)) && fromstdin==1 && force==0) + fatalError( "data not read from terminal. Use -f to force it.\n"); + if (isatty(fileno(stdout)) && tostdout==1 && force==0) + fatalError( "data not written to terminal. Use -f to force it.\n"); foreground = signal(SIGINT, SIG_IGN) != SIG_IGN; if (foreground) { @@ -1860,7 +1874,7 @@ int gzip_main(int argc, char **argv) ifile_size = -1L; /* convention for unknown size */ } else { /* Open up the input file */ - if (*argv == '\0') + if (argc <= 0) usage(gzip_usage); strncpy(ifname, *argv, MAX_PATH_LEN); |