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authorUlrich Drepper <drepper@redhat.com>2005-09-27 00:00:42 +0000
committerUlrich Drepper <drepper@redhat.com>2005-09-27 00:00:42 +0000
commitb5d839c996d7236ed5788296b4d723e67ec4fdb8 (patch)
treea5220f793e6180e189b99ab8c59401ab01a26f71 /libio/iofgets_u.c
parent9a5933834ba8f1289024c1ab13e1cd711b5ec3af (diff)
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[BZ #713]
2005-09-26  Ulrich Drepper  <drepper@redhat.com>
	[BZ #713]
	* libio/iofgets.c: Treat N==1 correctly.
	* libio/iofgets_u.c: Likewise.
	* libio/iofgetws.c: Likewise.
	* libio/iofgetws_u.c: Likewise.
	* stdio-common/Makefile (tests): Add tst-fgets.
	* stdio-common/tst-fgets.c: New file.
Diffstat (limited to 'libio/iofgets_u.c')
-rw-r--r--libio/iofgets_u.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/libio/iofgets_u.c b/libio/iofgets_u.c
index ded2a7c83c..4fb5b1c0fd 100644
--- a/libio/iofgets_u.c
+++ b/libio/iofgets_u.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993,1995,1996,1997,1998,2002 Free Software Foundation, Inc.
+/* Copyright (C) 1993,1995-1998,2002,2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -40,6 +40,14 @@ fgets_unlocked (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] = '\0';
+      return buf;
+    }
   /* This is very tricky since a file descriptor may be in the
      non-blocking mode. The error flag doesn't mean much in this
      case. We return an error only when there is a new error. */