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| author | Rich Felker <dalias@aerifal.cx> | 2018-08-29 23:53:45 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2018-08-29 23:53:45 -0400 |
| commit | a43a7b215cf7b71d1371c63927c17bae7177aa95 (patch) | |
| tree | c3766205559ed56d7f281a584a4be39cac13dc64 /src | |
| parent | f1791f42ef6d22e68dfc1ee45c0a478b156ce46d (diff) | |
| download | musl-a43a7b215cf7b71d1371c63927c17bae7177aa95.zip musl-a43a7b215cf7b71d1371c63927c17bae7177aa95.tar.gz musl-a43a7b215cf7b71d1371c63927c17bae7177aa95.tar.bz2 | |
make vfprintf set stream orientation even for zero-length output
if no output is produced, no underlying fwrite will ever be called,
but byte-oriented printf functions are still required to set the
orientation of the stream to byte-oriented. call __towrite explicitly
if the FILE is not already in write mode.
Diffstat (limited to 'src')
| -rw-r--r-- | src/stdio/vfprintf.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/stdio/vfprintf.c b/src/stdio/vfprintf.c index af069d1..2100eb5 100644 --- a/src/stdio/vfprintf.c +++ b/src/stdio/vfprintf.c @@ -678,7 +678,8 @@ int vfprintf(FILE *restrict f, const char *restrict fmt, va_list ap) f->buf_size = sizeof internal_buf; f->wpos = f->wbase = f->wend = 0; } - ret = printf_core(f, fmt, &ap2, nl_arg, nl_type); + if (!f->wend && __towrite(f)) ret = -1; + else ret = printf_core(f, fmt, &ap2, nl_arg, nl_type); if (saved_buf) { f->write(f, 0, 0); if (!f->wpos) ret = -1; |