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Diffstat (limited to 'archival/gzip.c')
-rw-r--r--archival/gzip.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/archival/gzip.c b/archival/gzip.c
index 98ce259..19ad1a7 100644
--- a/archival/gzip.c
+++ b/archival/gzip.c
@@ -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);