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| author | Denys Vlasenko | 2020-12-08 19:06:28 +0100 |
|---|---|---|
| committer | Denys Vlasenko | 2020-12-08 19:06:28 +0100 |
| commit | e7d853b4eb080dd8ea6433d010378e119e5a4cb3 (patch) | |
| tree | 763b97e9588504b5e25819d208b47c68f0029742 | |
| parent | abaee4aada7c91da6a43a83e9a73f98916a803a4 (diff) | |
| download | busybox-e7d853b4eb080dd8ea6433d010378e119e5a4cb3.zip busybox-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>
| -rw-r--r-- | networking/wget.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/networking/wget.c b/networking/wget.c index ea60c18..ff0df4c 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; |