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45c42b65c2
Adding some basic tests for fopen, testing different modes, stream positioning and concurrent read/write operation on files. Reviewed-by: DJ Delorie <dj@redhat.com>
280 lines
11 KiB
C
280 lines
11 KiB
C
/* Basic test for fopen.
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Copyright (C) 2025 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 <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <support/check.h>
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#include <support/temp_file.h>
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#include <support/xstdio.h>
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#define APPENDED_TEXT "This is appended text. "
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#define DEFAULT_TEXT "Lorem ipsum dolor sit amet, consectetur " \
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"adipiscing elit, sed do eiusmod tempor incididunt ut labore et " \
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"dolore magna aliqua."
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#define MAX_BUFFER_SIZE 300
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static int
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do_test (void)
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{
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char *temp_file;
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FILE *fd_file = NULL;
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char read_buffer[MAX_BUFFER_SIZE] = "";
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size_t ret;
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/* Prepare files. */
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int fd = create_temp_file ("tst-fopen.", &temp_file);
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TEST_VERIFY_EXIT (fd != -1);
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fd_file = fdopen (fd, "w");
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ret = fwrite (DEFAULT_TEXT, sizeof (char), strlen (DEFAULT_TEXT), fd_file);
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TEST_COMPARE (ret, strlen (DEFAULT_TEXT));
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xfclose (fd_file);
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/* Test 1: This checks for fopen with mode "r". Open text file for
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reading. The stream is positioned at the beginning of the file. */
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printf ("Test 1: This checks for fopen with mode \"r\".\n");
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fd_file = fopen (temp_file, "r");
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_VERIFY (fd_file != NULL);
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TEST_COMPARE (ftell (fd_file), 0);
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/* Read should succeed. */
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ret = fread (read_buffer, sizeof (char), MAX_BUFFER_SIZE, fd_file);
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_COMPARE (ret, strlen (DEFAULT_TEXT));
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TEST_VERIFY (strcmp (read_buffer, DEFAULT_TEXT) == 0);
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/* Write should fail. */
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errno = 0;
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ret = fwrite (DEFAULT_TEXT, sizeof (char), strlen (DEFAULT_TEXT), fd_file);
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TEST_VERIFY (ferror (fd_file) != 0);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (ret, 0);
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clearerr (fd_file);
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/* Opening non-existent file should fail. */
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xfclose (fd_file);
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errno = 0;
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fd_file = fopen ("file-that-does-not-exist", "r");
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TEST_VERIFY (fd_file == NULL);
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TEST_COMPARE (errno, ENOENT);
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TEST_VERIFY (fd_file == NULL);
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memset (read_buffer, 0, MAX_BUFFER_SIZE);
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/* Test 2: This checks for fopen with mode "r+". Open for reading and
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writing. The stream is positioned at the beginning of the file. */
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printf ("Test 2: This checks for fopen with mode \"r+\".\n");
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fd_file = fopen (temp_file, "r+");
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_VERIFY (fd_file != NULL);
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TEST_COMPARE (ftell (fd_file), 0);
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/* Read should succeed. */
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ret = fread (read_buffer, sizeof (char), MAX_BUFFER_SIZE, fd_file);
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_COMPARE (ret, strlen (DEFAULT_TEXT));
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TEST_VERIFY (strcmp (read_buffer, DEFAULT_TEXT) == 0);
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fflush (fd_file);
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/* File position indicator expected at 0 + read bytes. */
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TEST_COMPARE (ftell (fd_file), ret);
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/* Write should succeed. */
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ret = fwrite (DEFAULT_TEXT, sizeof (char), strlen (DEFAULT_TEXT), fd_file);
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_COMPARE (ret, strlen (DEFAULT_TEXT));
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/* Opening non-existent file should fail. */
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xfclose (fd_file);
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errno = 0;
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fd_file = fopen ("file-that-does-not-exist", "r+");
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TEST_VERIFY (fd_file == NULL);
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TEST_COMPARE (errno, ENOENT);
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TEST_VERIFY (fd_file == NULL);
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memset (read_buffer, 0, MAX_BUFFER_SIZE);
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/* Test 3: This checks for fopen with mode "w". Truncate file to zero
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length or create text file for writing. The stream is positioned
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at the beginning of the file. */
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printf ("Test 3: This checks for fopen with mode \"w\".\n");
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fd_file = fopen (temp_file, "w");
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_VERIFY (fd_file != NULL);
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TEST_COMPARE (ftell (fd_file), 0);
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/* Read should fail. */
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errno = 0;
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ret = fread (read_buffer, sizeof (char), MAX_BUFFER_SIZE, fd_file);
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TEST_VERIFY (ferror (fd_file) != 0);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (ret, 0);
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clearerr (fd_file);
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/* Write should succeed. */
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ret = fwrite (DEFAULT_TEXT, sizeof (char), strlen (DEFAULT_TEXT), fd_file);
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_COMPARE (ret, strlen (DEFAULT_TEXT));
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/* Opening non-existent file should succeed. */
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xfclose (fd_file);
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fd_file = fopen ("/tmp/file-that-does-not-exist", "w");
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_VERIFY (fd_file != NULL);
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TEST_COMPARE (ftell (fd_file), 0);
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xfclose (fd_file);
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remove ("/tmp/file-that-does-not-exist");
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memset (read_buffer, 0, MAX_BUFFER_SIZE);
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/* Test 4: This checks for fopen with mode "w+". Open for reading and
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writing. The file is created if it does not exist, otherwise it is
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truncated. The stream is positioned at the beginning of the file.
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*/
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printf ("Test 4: This checks for fopen with mode \"w+\".\n");
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fd_file = fopen (temp_file, "w+");
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_VERIFY (fd_file != NULL);
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TEST_COMPARE (ftell (fd_file), 0);
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/* Read should succeed. */
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ret = fread (read_buffer, sizeof (char), MAX_BUFFER_SIZE, fd_file);
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_COMPARE (ret, 0);
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TEST_VERIFY (read_buffer[0] == '\0');
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/* Write should succeed. */
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ret = fwrite (DEFAULT_TEXT, sizeof (char), strlen (DEFAULT_TEXT), fd_file);
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_COMPARE (ret, strlen (DEFAULT_TEXT));
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/* Opening non-existent file should succeed. */
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xfclose (fd_file);
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fd_file = fopen ("/tmp/file-that-does-not-exist", "w+");
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_VERIFY (fd_file != NULL);
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TEST_COMPARE (ftell (fd_file), 0);
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xfclose (fd_file);
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remove ("/tmp/file-that-does-not-exist");
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memset (read_buffer, 0, MAX_BUFFER_SIZE);
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/* Test 5: This checks for fopen with mode "a". Open for appending
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(writing at end of file). The file is created if it does not
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exist. The stream is positioned at the end of the file. */
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printf ("Test 5: This checks for fopen with mode \"a\".\n");
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fd_file = fopen (temp_file, "a");
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_VERIFY (fd_file != NULL);
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TEST_COMPARE (ftell (fd_file), strlen (DEFAULT_TEXT));
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/* Read should fail. */
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errno = 0;
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ret = fread (read_buffer, sizeof (char), MAX_BUFFER_SIZE, fd_file);
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TEST_VERIFY (ferror (fd_file) != 0);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (ret, 0);
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clearerr (fd_file);
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/* Write should succeed. */
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ret = fwrite (APPENDED_TEXT, sizeof (char), strlen (APPENDED_TEXT), fd_file);
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_COMPARE (ret, strlen (APPENDED_TEXT));
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/* The file position indicator for the stream is advanced by the
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* number of bytes successfully read or written. */
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TEST_COMPARE (ftell (fd_file), strlen (DEFAULT_TEXT) + ret);
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/* Opening non-existent file should succeed. */
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xfclose (fd_file);
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fd_file = fopen ("/tmp/file-that-does-not-exist", "a");
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_VERIFY (fd_file != NULL);
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TEST_COMPARE (ftell (fd_file), 0);
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xfclose (fd_file);
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remove ("/tmp/file-that-does-not-exist");
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memset (read_buffer, 0, MAX_BUFFER_SIZE);
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/* Test 6: This checks for fopen with mode "a+". Open for reading and
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appending (writing at end of file). The file is created if it does
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not exist. Output is always appended to the end of the file. The
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initial file position for reading is at the beginning of the file,
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but it is advanced to the end prior to each write. */
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printf ("Test 6: This checks for fopen with mode \"a+\".\n");
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errno = 0;
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fd_file = fopen (temp_file, "a+");
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TEST_COMPARE (errno, 0);
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TEST_VERIFY (fd_file != NULL);
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TEST_COMPARE (ftell (fd_file), 0);
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/* Read should succeed. */
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ret = fread (read_buffer, sizeof (char), MAX_BUFFER_SIZE, fd_file);
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_COMPARE (ret, strlen (DEFAULT_TEXT) + strlen (APPENDED_TEXT));
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TEST_VERIFY (strcmp (read_buffer, DEFAULT_TEXT APPENDED_TEXT) == 0);
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/* Write should succeed. */
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const char* SECOND_APPEND = "This is second append.";
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ret = fwrite (SECOND_APPEND, sizeof (char), strlen (SECOND_APPEND), fd_file);
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_COMPARE (ret, strlen (SECOND_APPEND));
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/* The file position indicator for the stream is advanced by the
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number of bytes successfully read or written. */
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TEST_COMPARE (ftell (fd_file),
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strlen (DEFAULT_TEXT) + strlen (APPENDED_TEXT) + ret);
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/* Opening non-existent file should succeed. */
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xfclose (fd_file);
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fd_file = fopen ("/tmp/file-that-does-not-exist", "a+");
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_VERIFY (fd_file != NULL);
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TEST_COMPARE (ftell (fd_file), 0);
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xfclose (fd_file);
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remove ("/tmp/file-that-does-not-exist");
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memset (read_buffer, 0, MAX_BUFFER_SIZE);
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/* Test 7: This checks for fopen with other valid modes set, such as
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"rc", "we" or "am". The test calls fopen with these modes and
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checks that no errors appear. */
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printf ("Test 7: This checks for fopen with other valid modes set, "
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"such as \"rc\", \"we\" or \"am\".\n");
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/* These modes all operate correctly with the file already present. */
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static const char *valid_modes[] =
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{ "rc", "we", "am", "r+x", "wb+", "ab", 0 };
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const char **p = valid_modes;
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while (*p != 0)
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{
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fd_file = fopen (temp_file, *p);
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TEST_COMPARE (ferror (fd_file), 0);
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TEST_VERIFY (fd_file != NULL);
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xfclose (fd_file);
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++p;
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}
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/* Test 8: This checks for fopen with invalid modes. The test calls
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fopen with these modes and checks that opening existing files with
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invalid mode fails and that opening non-existing files with invalid
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mode doesn't create a new file. */
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printf ("Test 8: This checks for fopen with invalid modes.\n");
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static const char *invalid_modes[] = { "0", "tr", "z", "x", " ", 0 };
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p = invalid_modes;
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while (*p != 0)
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{
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errno = 0;
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fd_file = fopen (temp_file, *p);
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TEST_VERIFY (fd_file == NULL);
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TEST_COMPARE (errno, EINVAL);
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errno = 0;
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fd_file = fopen ("/tmp/file-that-does-not-exist", *p);
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TEST_VERIFY (fd_file == NULL);
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TEST_COMPARE (errno, EINVAL);
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++p;
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TEST_VERIFY (access ("/tmp/file-that-does-not-exist", F_OK) == -1);
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}
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return 0;
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}
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#include <support/test-driver.c>
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