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2b766585f9
[BZ #11741] Fixed bug where printf and family may return a spurious success when printing padded formats.
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* Verify that print functions return error when there is an I/O error.
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Copyright (C) 2005-2012 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <error.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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static int
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do_test (void)
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{
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char tmpl[] = "/tmp/tst-put-error.XXXXXX";
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int fd = mkstemp (tmpl);
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if (fd == -1)
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error (EXIT_FAILURE, errno, "cannot create temporary file");
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FILE *fp = fdopen (fd, "w");
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if (fp == NULL)
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error (EXIT_FAILURE, errno, "fdopen");
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setlinebuf (fp);
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close (fd);
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unlink (tmpl);
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int n = fprintf (fp, "hello world\n");
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printf ("fprintf = %d\n", n);
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if (n >= 0)
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error (EXIT_FAILURE, 0, "first fprintf succeeded");
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n = fprintf (fp, "hello world\n");
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printf ("fprintf = %d\n", n);
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if (n >= 0)
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error (EXIT_FAILURE, 0, "second fprintf succeeded");
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/* Padded printing takes a different code path. */
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n = fprintf (fp, "%10000s", "foo");
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printf ("fprintf = %d\n", n);
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if (n >= 0)
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error (EXIT_FAILURE, 0, "padded fprintf succeeded");
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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