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-rw-r--r--src/stdio/vfprintf.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/src/stdio/vfprintf.c b/src/stdio/vfprintf.c
index 57878c03..8cbfd96e 100644
--- a/src/stdio/vfprintf.c
+++ b/src/stdio/vfprintf.c
@@ -627,13 +627,26 @@ int vfprintf(FILE *f, const char *fmt, va_list ap)
va_list ap2;
int nl_type[NL_ARGMAX] = {0};
union arg nl_arg[NL_ARGMAX];
+ unsigned char internal_buf[80], *saved_buf = 0;
int ret;
va_copy(ap2, ap);
if (printf_core(0, fmt, &ap2, nl_arg, nl_type) < 0) return -1;
FLOCK(f);
+ if (!f->buf_size) {
+ saved_buf = f->buf;
+ f->buf = internal_buf;
+ f->buf_size = sizeof internal_buf;
+ }
ret = printf_core(f, fmt, &ap2, nl_arg, nl_type);
+ if (saved_buf) {
+ f->write(f, 0, 0);
+ if (!f->wpos) ret = -1;
+ f->buf = saved_buf;
+ f->buf_size = 0;
+ f->wpos = f->wbase = f->wend = 0;
+ }
FUNLOCK(f);
va_end(ap2);
return ret;