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/* Test fread.
Copyright (C) 2024-2025 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
#include <support/xstdio.h>
#include <support/xunistd.h>
int
do_test (void)
{
char *temp_dir = support_create_temp_directory ("tst-fread");
char *file1 = xasprintf ("%s/file1", temp_dir);
support_write_file_string (file1, "file1");
add_temp_file (file1);
FILE *fp;
size_t ret;
char buf[1024];
verbose_printf ("test single-byte reads\n");
fp = xfopen (file1, "r");
memset (buf, 0, sizeof buf);
ret = fread (buf, 1, 2, fp);
TEST_COMPARE (ret, 2);
TEST_COMPARE (buf[0], 'f');
TEST_COMPARE (buf[1], 'i');
TEST_COMPARE (feof (fp), 0);
TEST_COMPARE (ftell (fp), 2);
memset (buf, 0, sizeof buf);
ret = fread (buf, 1, 3, fp);
TEST_COMPARE (ret, 3);
TEST_COMPARE (buf[0], 'l');
TEST_COMPARE (buf[1], 'e');
TEST_COMPARE (buf[2], '1');
TEST_COMPARE (ftell (fp), 5);
TEST_COMPARE (feof (fp), 0);
memset (buf, 0, sizeof buf);
ret = fread (buf, 1, 1, fp);
TEST_COMPARE (ret, 0);
TEST_COMPARE (!!feof (fp), 1);
TEST_COMPARE (ferror (fp), 0);
TEST_COMPARE (ftell (fp), 5);
xfclose (fp);
verbose_printf ("test single-byte reads, EOF part way through\n");
fp = xfopen (file1, "r");
memset (buf, 0, sizeof buf);
ret = fread (buf, 1, sizeof buf, fp);
TEST_COMPARE (ret, 5);
TEST_COMPARE (buf[0], 'f');
TEST_COMPARE (buf[1], 'i');
TEST_COMPARE (buf[2], 'l');
TEST_COMPARE (buf[3], 'e');
TEST_COMPARE (buf[4], '1');
TEST_COMPARE (!!feof (fp), 1);
TEST_COMPARE (ferror (fp), 0);
TEST_COMPARE (ftell (fp), 5);
xfclose (fp);
verbose_printf ("test multi-byte reads\n");
fp = xfopen (file1, "r");
memset (buf, 0, sizeof buf);
ret = fread (buf, 2, 2, fp);
TEST_COMPARE (ret, 2);
TEST_COMPARE (buf[0], 'f');
TEST_COMPARE (buf[1], 'i');
TEST_COMPARE (buf[2], 'l');
TEST_COMPARE (buf[3], 'e');
TEST_COMPARE (feof (fp), 0);
TEST_COMPARE (ftell (fp), 4);
memset (buf, 0, sizeof buf);
ret = fread (buf, 3, 3, fp);
TEST_COMPARE (ret, 0);
/* The bytes written for a partial element read are unspecified. */
TEST_COMPARE (!!feof (fp), 1);
TEST_COMPARE (ferror (fp), 0);
TEST_COMPARE (ftell (fp), 5);
xfclose (fp);
verbose_printf ("test read error\n");
fp = xfopen (file1, "r");
xclose (fileno (fp));
memset (buf, 0, sizeof buf);
ret = fread (buf, 1, sizeof buf, fp);
TEST_COMPARE (ret, 0);
TEST_COMPARE (feof (fp), 0);
TEST_COMPARE (!!ferror (fp), 1);
fclose (fp);
verbose_printf ("test zero size\n");
fp = xfopen (file1, "r");
ret = fread (buf, 0, SIZE_MAX, fp);
TEST_COMPARE (ret, 0);
TEST_COMPARE (feof (fp), 0);
TEST_COMPARE (ferror (fp), 0);
TEST_COMPARE (ftell (fp), 0);
xfclose (fp);
verbose_printf ("test zero items\n");
fp = xfopen (file1, "r");
ret = fread (buf, SIZE_MAX, 0, fp);
TEST_COMPARE (ret, 0);
TEST_COMPARE (feof (fp), 0);
TEST_COMPARE (ferror (fp), 0);
TEST_COMPARE (ftell (fp), 0);
xfclose (fp);
free (temp_dir);
free (file1);
return 0;
}
#include <support/test-driver.c>
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