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authorDenys Vlasenko <vda.linux@googlemail.com>2020-12-08 19:06:28 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2020-12-08 19:06:28 +0100
commite7d853b4eb080dd8ea6433d010378e119e5a4cb3 (patch)
tree763b97e9588504b5e25819d208b47c68f0029742 /networking
parentabaee4aada7c91da6a43a83e9a73f98916a803a4 (diff)
downloadbusybox-e7d853b4eb080dd8ea6433d010378e119e5a4cb3.tar.gz
wget: do not ftruncate if -O- is used, closes 13351
function old new delta wget_main 2558 2571 +13 retrieve_file_data 612 621 +9 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/0 up/down: 22/0) Total: 22 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'networking')
-rw-r--r--networking/wget.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/networking/wget.c b/networking/wget.c
index ea60c18b2..ff0df4ca0 100644
--- a/networking/wget.c
+++ b/networking/wget.c
@@ -287,6 +287,8 @@ enum {
WGET_OPT_POST_DATA = (1 << 12) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
WGET_OPT_SPIDER = (1 << 13) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
WGET_OPT_NO_CHECK_CERT = (1 << 14) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
+ /* hijack this bit for other than opts purposes: */
+ WGET_NO_FTRUNCATE = (1 << 31)
};
enum {
@@ -1052,8 +1054,13 @@ static void NOINLINE retrieve_file_data(FILE *dfp)
*/
{
off_t pos = lseek(G.output_fd, 0, SEEK_CUR);
- if (pos != (off_t)-1)
- ftruncate(G.output_fd, pos);
+ if (pos != (off_t)-1) {
+ /* do not truncate if -O- is in use, a user complained about
+ * "wget -qO- 'http://example.com/empty' >>FILE" truncating FILE.
+ */
+ if (!(option_mask32 & WGET_NO_FTRUNCATE))
+ ftruncate(G.output_fd, pos);
+ }
}
if (!(option_mask32 & WGET_OPT_QUIET)) {
@@ -1566,7 +1573,7 @@ IF_DESKTOP( "no-parent\0" No_argument "\xf0")
if (G.fname_out) { /* -O FILE ? */
if (LONE_DASH(G.fname_out)) { /* -O - ? */
G.output_fd = 1;
- option_mask32 &= ~WGET_OPT_CONTINUE;
+ option_mask32 = (option_mask32 & (~WGET_OPT_CONTINUE)) | WGET_NO_FTRUNCATE;
}
/* compat with wget: -O FILE can overwrite */
G.o_flags = O_WRONLY | O_CREAT | O_TRUNC;