1 files changed, 1 insertions, 15 deletions
diff --git a/src/stdio/ungetc.c b/src/stdio/ungetc.c
index 07181684..7f56f8d5 100644
--- a/src/stdio/ungetc.c
+++ b/src/stdio/ungetc.c
@@ -6,25 +6,11 @@ int ungetc(int c, FILE *f)
 
 	FLOCK(f);
 
-	/* Fail if unreadable or writing and unable to flush */
-	if ((f->flags & (F_ERR|F_NORD)) || (f->wpos && __oflow(f))) {
+	if ((!f->rend && __toread(f)) || f->rpos <= f->buf - UNGET) {
 		FUNLOCK(f);
 		return EOF;
 	}
 
-	/* Clear write mode */
-	f->wbase = f->wpos = f->wstop = f->wend = 0;
-
-	/* Put the file in read mode */
-	if (!f->rpos) f->rpos = f->rend = f->buf;
-
-	/* If unget buffer is already full, fail. */
-	if (f->rpos <= f->buf - UNGET) {
-		FUNLOCK(f);
-		return EOF;
-	}
-
-	/* Put a byte back into the buffer */
 	*--f->rpos = c;
 	f->flags &= ~F_EOF;