From 2b766585f9b4ffabeef2f36200c275976b93f2c7 Mon Sep 17 00:00:00 2001 From: Siddhesh Poyarekar Date: Fri, 16 Nov 2012 19:13:11 +0530 Subject: printf should return negative value on error [BZ #11741] Fixed bug where printf and family may return a spurious success when printing padded formats. --- stdio-common/tst-put-error.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'stdio-common/tst-put-error.c') diff --git a/stdio-common/tst-put-error.c b/stdio-common/tst-put-error.c index 115dbd509a..7b95491725 100644 --- a/stdio-common/tst-put-error.c +++ b/stdio-common/tst-put-error.c @@ -1,3 +1,22 @@ +/* Verify that print functions return error when there is an I/O error. + + Copyright (C) 2005-2012 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 + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + #include #include #include @@ -26,6 +45,13 @@ do_test (void) printf ("fprintf = %d\n", n); if (n >= 0) error (EXIT_FAILURE, 0, "second fprintf succeeded"); + + /* Padded printing takes a different code path. */ + n = fprintf (fp, "%10000s", "foo"); + printf ("fprintf = %d\n", n); + if (n >= 0) + error (EXIT_FAILURE, 0, "padded fprintf succeeded"); + return 0; } -- cgit v1.2.1