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-rw-r--r--libio/iofgetws.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/libio/iofgetws.c b/libio/iofgetws.c
index 654c051..7753911 100644
--- a/libio/iofgetws.c
+++ b/libio/iofgetws.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993, 1995, 1996, 1997, 1998, 1999, 2001
+/* Copyright (C) 1993, 1995, 1996, 1997, 1998, 1999, 2001, 2005
Free Software Foundation, Inc.
This file is part of the GNU C Library.
@@ -41,6 +41,14 @@ fgetws (buf, n, fp)
CHECK_FILE (fp, NULL);
if (n <= 0)
return NULL;
+ if (__builtin_expect (n == 1, 0))
+ {
+ /* Another irregular case: since we have to store a NUL byte and
+ there is only room for exactly one byte, we don't have to
+ read anything. */
+ buf[0] = L'\0';
+ return buf;
+ }
_IO_acquire_lock (fp);
/* This is very tricky since a file descriptor may be in the
non-blocking mode. The error flag doesn't mean much in this