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d14c977c65
There seem to be no glibc tests specifically for the fread function. Add basic tests of that function. Tested for x86_64.
135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/* Test fread.
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Copyright (C) 2024 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 <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/test-driver.h>
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#include <support/xstdio.h>
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#include <support/xunistd.h>
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int
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do_test (void)
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{
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char *temp_dir = support_create_temp_directory ("tst-fread");
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char *file1 = xasprintf ("%s/file1", temp_dir);
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support_write_file_string (file1, "file1");
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add_temp_file (file1);
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FILE *fp;
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size_t ret;
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char buf[1024];
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verbose_printf ("test single-byte reads\n");
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fp = xfopen (file1, "r");
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memset (buf, 0, sizeof buf);
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ret = fread (buf, 1, 2, fp);
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TEST_COMPARE (ret, 2);
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TEST_COMPARE (buf[0], 'f');
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TEST_COMPARE (buf[1], 'i');
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TEST_COMPARE (feof (fp), 0);
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TEST_COMPARE (ftell (fp), 2);
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memset (buf, 0, sizeof buf);
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ret = fread (buf, 1, 3, fp);
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TEST_COMPARE (ret, 3);
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TEST_COMPARE (buf[0], 'l');
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TEST_COMPARE (buf[1], 'e');
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TEST_COMPARE (buf[2], '1');
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TEST_COMPARE (ftell (fp), 5);
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TEST_COMPARE (feof (fp), 0);
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memset (buf, 0, sizeof buf);
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ret = fread (buf, 1, 1, fp);
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TEST_COMPARE (ret, 0);
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TEST_COMPARE (!!feof (fp), 1);
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TEST_COMPARE (ferror (fp), 0);
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TEST_COMPARE (ftell (fp), 5);
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xfclose (fp);
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verbose_printf ("test single-byte reads, EOF part way through\n");
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fp = xfopen (file1, "r");
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memset (buf, 0, sizeof buf);
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ret = fread (buf, 1, sizeof buf, fp);
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TEST_COMPARE (ret, 5);
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TEST_COMPARE (buf[0], 'f');
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TEST_COMPARE (buf[1], 'i');
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TEST_COMPARE (buf[2], 'l');
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TEST_COMPARE (buf[3], 'e');
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TEST_COMPARE (buf[4], '1');
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TEST_COMPARE (!!feof (fp), 1);
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TEST_COMPARE (ferror (fp), 0);
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TEST_COMPARE (ftell (fp), 5);
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xfclose (fp);
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verbose_printf ("test multi-byte reads\n");
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fp = xfopen (file1, "r");
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memset (buf, 0, sizeof buf);
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ret = fread (buf, 2, 2, fp);
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TEST_COMPARE (ret, 2);
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TEST_COMPARE (buf[0], 'f');
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TEST_COMPARE (buf[1], 'i');
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TEST_COMPARE (buf[2], 'l');
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TEST_COMPARE (buf[3], 'e');
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TEST_COMPARE (feof (fp), 0);
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TEST_COMPARE (ftell (fp), 4);
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memset (buf, 0, sizeof buf);
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ret = fread (buf, 3, 3, fp);
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TEST_COMPARE (ret, 0);
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/* The bytes written for a partial element read are unspecified. */
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TEST_COMPARE (!!feof (fp), 1);
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TEST_COMPARE (ferror (fp), 0);
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TEST_COMPARE (ftell (fp), 5);
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xfclose (fp);
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verbose_printf ("test read error\n");
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fp = xfopen (file1, "r");
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xclose (fileno (fp));
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memset (buf, 0, sizeof buf);
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ret = fread (buf, 1, sizeof buf, fp);
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TEST_COMPARE (ret, 0);
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TEST_COMPARE (feof (fp), 0);
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TEST_COMPARE (!!ferror (fp), 1);
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fclose (fp);
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verbose_printf ("test zero size\n");
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fp = xfopen (file1, "r");
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ret = fread (buf, 0, SIZE_MAX, fp);
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TEST_COMPARE (ret, 0);
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TEST_COMPARE (feof (fp), 0);
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TEST_COMPARE (ferror (fp), 0);
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TEST_COMPARE (ftell (fp), 0);
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xfclose (fp);
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verbose_printf ("test zero items\n");
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fp = xfopen (file1, "r");
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ret = fread (buf, SIZE_MAX, 0, fp);
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TEST_COMPARE (ret, 0);
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TEST_COMPARE (feof (fp), 0);
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TEST_COMPARE (ferror (fp), 0);
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TEST_COMPARE (ftell (fp), 0);
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xfclose (fp);
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free (temp_dir);
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free (file1);
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return 0;
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}
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#include <support/test-driver.c>
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