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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /libio/iofgets.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
Diffstat (limited to 'libio/iofgets.c')
-rw-r--r--libio/iofgets.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/libio/iofgets.c b/libio/iofgets.c
index 879cc975a3..601b1746a1 100644
--- a/libio/iofgets.c
+++ b/libio/iofgets.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993, 1995, 1996, 1997, 1998, 1999, 2002, 2003
+/* Copyright (C) 1993, 1995, 1996, 1997, 1998, 1999, 2002, 2003, 2005
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -41,6 +41,14 @@ _IO_fgets (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;
+    }
   _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