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/* Test the xreadlink function.
Copyright (C) 2017-2024 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
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/xunistd.h>
static int
do_test (void)
{
char *dir = support_create_temp_directory ("tst-xreadlink-");
char *symlink_name = xasprintf ("%s/symlink", dir);
add_temp_file (symlink_name);
/* The limit 10000 is arbitrary and simply there to prevent an
attempt to exhaust all available disk space. */
for (int size = 1; size < 10000; ++size)
{
char *contents = xmalloc (size + 1);
for (int i = 0; i < size; ++i)
contents[i] = 'a' + (rand () % 26);
contents[size] = '\0';
if (symlink (contents, symlink_name) != 0)
{
if (errno == ENAMETOOLONG)
{
printf ("info: ENAMETOOLONG failure at %d bytes\n", size);
free (contents);
break;
}
FAIL_EXIT1 ("symlink (%d bytes): %m", size);
}
char *readlink_result = xreadlink (symlink_name);
TEST_VERIFY (strcmp (readlink_result, contents) == 0);
free (readlink_result);
xunlink (symlink_name);
free (contents);
}
/* Create an empty file to suppress the temporary file deletion
warning. */
xclose (xopen (symlink_name, O_WRONLY | O_CREAT, 0));
free (symlink_name);
free (dir);
return 0;
}
#include <support/test-driver.c>
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