diff options
Diffstat (limited to 'stdio-common/tst-fread.c')
| -rw-r--r-- | stdio-common/tst-fread.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/stdio-common/tst-fread.c b/stdio-common/tst-fread.c new file mode 100644 index 0000000000..4d9a7895f6 --- /dev/null +++ b/stdio-common/tst-fread.c @@ -0,0 +1,134 @@ +/* Test fread. + Copyright (C) 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 <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> |