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73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
/* Test the xreadlink function.
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Copyright (C) 2017-2020 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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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/temp_file.h>
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#include <support/xunistd.h>
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static int
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do_test (void)
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{
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char *dir = support_create_temp_directory ("tst-xreadlink-");
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char *symlink_name = xasprintf ("%s/symlink", dir);
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add_temp_file (symlink_name);
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/* The limit 10000 is arbitrary and simply there to prevent an
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attempt to exhaust all available disk space. */
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for (int size = 1; size < 10000; ++size)
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{
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char *contents = xmalloc (size + 1);
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for (int i = 0; i < size; ++i)
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contents[i] = 'a' + (rand () % 26);
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contents[size] = '\0';
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if (symlink (contents, symlink_name) != 0)
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{
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if (errno == ENAMETOOLONG)
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{
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printf ("info: ENAMETOOLONG failure at %d bytes\n", size);
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free (contents);
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break;
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}
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FAIL_EXIT1 ("symlink (%d bytes): %m", size);
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}
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char *readlink_result = xreadlink (symlink_name);
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TEST_VERIFY (strcmp (readlink_result, contents) == 0);
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free (readlink_result);
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xunlink (symlink_name);
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free (contents);
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}
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/* Create an empty file to suppress the temporary file deletion
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warning. */
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xclose (xopen (symlink_name, O_WRONLY | O_CREAT, 0));
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free (symlink_name);
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free (dir);
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return 0;
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}
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#include <support/test-driver.c>
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