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make vfprintf set stream orientation even for zero-length output

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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.
This commit is contained in:
Rich Felker 2018-08-29 23:53:45 -04:00
parent f1791f42ef
commit a43a7b215c
1 changed files with 2 additions and 1 deletions
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3
src/stdio/vfprintf.c
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@ -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;