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685 lines
17 KiB
C
685 lines
17 KiB
C
/* Verify that ftell returns the correct value at various points before and
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after the handler on which it is called becomes active.
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Copyright (C) 2014-2024 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 <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <locale.h>
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#include <wchar.h>
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static int do_test (void);
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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#define get_handles_fdopen(filename, fd, fp, fd_mode, mode) \
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({ \
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int ret = 0; \
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(fd) = open ((filename), (fd_mode), 0); \
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if ((fd) == -1) \
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{ \
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printf ("open failed: %m\n"); \
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ret = 1; \
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} \
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else \
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{ \
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(fp) = fdopen ((fd), (mode)); \
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if ((fp) == NULL) \
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{ \
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printf ("fdopen failed: %m\n"); \
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close (fd); \
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ret = 1; \
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} \
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} \
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ret; \
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})
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#define get_handles_fopen(filename, fd, fp, mode) \
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({ \
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int ret = 0; \
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(fp) = fopen ((filename), (mode)); \
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if ((fp) == NULL) \
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{ \
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printf ("fopen failed: %m\n"); \
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ret = 1; \
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} \
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else \
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{ \
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(fd) = fileno (fp); \
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if ((fd) == -1) \
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{ \
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printf ("fileno failed: %m\n"); \
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ret = 1; \
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} \
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} \
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ret; \
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})
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/* data points to either char_data or wide_data, depending on whether we're
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testing regular file mode or wide mode respectively. Similarly,
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fputs_func points to either fputs or fputws. data_len keeps track of the
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length of the current data and file_len maintains the current file
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length. */
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static const void *data;
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static const char *char_data = "abcdef";
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static const wchar_t *wide_data = L"abcdef";
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static size_t data_len;
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static size_t file_len;
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typedef int (*fputs_func_t) (const void *data, FILE *fp);
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typedef void *(*fgets_func_t) (void *ws, int n, FILE *fp);
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fputs_func_t fputs_func;
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fgets_func_t fgets_func;
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/* This test verifies that the offset reported by ftell is correct after the
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file is truncated using ftruncate. ftruncate does not change the file
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offset on truncation and hence, SEEK_CUR should continue to point to the
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old offset and not be changed to the new offset. */
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static int
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do_ftruncate_test (const char *filename)
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{
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FILE *fp = NULL;
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int fd;
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int ret = 0;
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struct test
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{
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const char *mode;
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int fd_mode;
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} test_modes[] = {
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{"r+", O_RDWR},
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{"w", O_WRONLY | O_TRUNC},
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{"w+", O_RDWR | O_TRUNC},
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{"a", O_WRONLY},
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{"a+", O_RDWR}
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};
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for (int j = 0; j < 2; j++)
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{
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for (int i = 0; i < sizeof (test_modes) / sizeof (struct test); i++)
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{
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int fileret;
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printf ("\tftruncate: %s (file, \"%s\"): ",
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j == 0 ? "fopen" : "fdopen",
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test_modes[i].mode);
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if (j == 0)
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fileret = get_handles_fopen (filename, fd, fp, test_modes[i].mode);
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else
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fileret = get_handles_fdopen (filename, fd, fp,
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test_modes[i].fd_mode,
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test_modes[i].mode);
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if (fileret != 0)
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return fileret;
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/* Write some data. */
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size_t written = fputs_func (data, fp);
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if (written == EOF)
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{
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printf ("fputs[1] failed to write data\n");
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ret |= 1;
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}
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/* Record the offset. */
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long offset = ftell (fp);
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/* Flush data to allow switching active handles. */
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if (fflush (fp))
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{
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printf ("Flush failed: %m\n");
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ret |= 1;
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}
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/* Now truncate the file. */
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if (ftruncate (fd, 0) != 0)
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{
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printf ("Failed to truncate file: %m\n");
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ret |= 1;
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}
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/* ftruncate does not change the offset, so there is no need to call
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anything to be able to switch active handles. */
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long new_offset = ftell (fp);
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/* The offset should remain unchanged since ftruncate does not update
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it. */
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if (offset != new_offset)
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{
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printf ("Incorrect offset. Expected %ld, but got %ld\n",
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offset, new_offset);
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ret |= 1;
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}
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else
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printf ("offset = %ld\n", offset);
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fclose (fp);
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}
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}
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return ret;
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}
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/* Test that ftell output after a rewind is correct. */
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static int
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do_rewind_test (const char *filename)
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{
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int ret = 0;
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struct test
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{
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const char *mode;
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int fd_mode;
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size_t old_off;
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size_t new_off;
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} test_modes[] = {
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{"w", O_WRONLY | O_TRUNC, 0, data_len},
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{"w+", O_RDWR | O_TRUNC, 0, data_len},
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{"r+", O_RDWR, 0, data_len},
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/* The new offsets for 'a' and 'a+' modes have to factor in the
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previous writes since they always append to the end of the
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file. */
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{"a", O_WRONLY, 0, 3 * data_len},
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{"a+", O_RDWR, 0, 4 * data_len},
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};
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/* Empty the file before the test so that our offsets are simple to
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calculate. */
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FILE *fp = fopen (filename, "w");
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if (fp == NULL)
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{
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printf ("Failed to open file for emptying\n");
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return 1;
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}
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fclose (fp);
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for (int j = 0; j < 2; j++)
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{
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for (int i = 0; i < sizeof (test_modes) / sizeof (struct test); i++)
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{
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FILE *fp;
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int fd;
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int fileret;
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printf ("\trewind: %s (file, \"%s\"): ", j == 0 ? "fdopen" : "fopen",
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test_modes[i].mode);
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if (j == 0)
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fileret = get_handles_fdopen (filename, fd, fp,
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test_modes[i].fd_mode,
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test_modes[i].mode);
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else
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fileret = get_handles_fopen (filename, fd, fp, test_modes[i].mode);
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if (fileret != 0)
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return fileret;
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/* Write some content to the file, rewind and ensure that the ftell
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output after the rewind is 0. POSIX does not specify what the
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behavior is when a file is rewound in 'a' mode, so we retain
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current behavior, which is to keep the 0 offset. */
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size_t written = fputs_func (data, fp);
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if (written == EOF)
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{
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printf ("fputs[1] failed to write data\n");
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ret |= 1;
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}
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rewind (fp);
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long offset = ftell (fp);
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if (offset != test_modes[i].old_off)
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{
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printf ("Incorrect old offset. Expected %zu, but got %ld, ",
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test_modes[i].old_off, offset);
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ret |= 1;
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}
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else
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printf ("old offset = %ld, ", offset);
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written = fputs_func (data, fp);
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if (written == EOF)
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{
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printf ("fputs[1] failed to write data\n");
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ret |= 1;
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}
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/* After this write, the offset in append modes should factor in the
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implicit lseek to the end of file. */
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offset = ftell (fp);
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if (offset != test_modes[i].new_off)
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{
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printf ("Incorrect new offset. Expected %zu, but got %ld\n",
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test_modes[i].new_off, offset);
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ret |= 1;
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}
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else
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printf ("new offset = %ld\n", offset);
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}
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}
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return ret;
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}
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/* Test that the value of ftell is not cached when the stream handle is not
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active. */
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static int
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do_ftell_test (const char *filename)
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{
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int ret = 0;
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struct test
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{
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const char *mode;
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int fd_mode;
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size_t old_off;
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size_t new_off;
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size_t eof_off;
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} test_modes[] = {
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/* In w, w+ and r+ modes, the file position should be at the
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beginning of the file. After the write, the offset should be
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updated to data_len. We don't use eof_off in w and a modes since
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they don't allow reading. */
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{"w", O_WRONLY | O_TRUNC, 0, data_len, 0},
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{"w+", O_RDWR | O_TRUNC, 0, data_len, 2 * data_len},
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{"r+", O_RDWR, 0, data_len, 3 * data_len},
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/* For the 'a' mode, the initial file position should be the
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current end of file. After the write, the offset has data_len
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added to the old value. For a+ mode however, the initial file
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position is the file position of the underlying file descriptor,
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since it is initially assumed to be in read mode. */
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{"a", O_WRONLY, 3 * data_len, 4 * data_len, 5 * data_len},
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{"a+", O_RDWR, 0, 5 * data_len, 6 * data_len},
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};
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for (int j = 0; j < 2; j++)
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{
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for (int i = 0; i < sizeof (test_modes) / sizeof (struct test); i++)
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{
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FILE *fp;
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int fd;
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int fileret;
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printf ("\tftell: %s (file, \"%s\"): ", j == 0 ? "fdopen" : "fopen",
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test_modes[i].mode);
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if (j == 0)
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fileret = get_handles_fdopen (filename, fd, fp,
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test_modes[i].fd_mode,
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test_modes[i].mode);
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else
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fileret = get_handles_fopen (filename, fd, fp, test_modes[i].mode);
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if (fileret != 0)
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return fileret;
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long off = ftell (fp);
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if (off != test_modes[i].old_off)
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{
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printf ("Incorrect old offset. Expected %zu but got %ld, ",
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test_modes[i].old_off, off);
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ret |= 1;
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}
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else
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printf ("old offset = %ld, ", off);
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/* The effect of this write on the offset should be seen in the ftell
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call that follows it. */
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int write_ret = write (fd, data, data_len);
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if (write_ret != data_len)
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{
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printf ("write failed (%m)\n");
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ret |= 1;
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}
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off = ftell (fp);
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if (off != test_modes[i].new_off)
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{
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printf ("Incorrect new offset. Expected %zu but got %ld",
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test_modes[i].new_off, off);
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ret |= 1;
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}
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else
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printf ("new offset = %ld", off);
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/* Read to the end, write some data to the fd and check if ftell can
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see the new ofset. Do this test only for files that allow
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reading. */
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if (test_modes[i].fd_mode != O_WRONLY)
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{
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wchar_t tmpbuf[data_len];
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rewind (fp);
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while (fgets_func (tmpbuf, data_len, fp) && !feof (fp));
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write_ret = write (fd, data, data_len);
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if (write_ret != data_len)
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{
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printf ("write failed (%m)\n");
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ret |= 1;
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}
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off = ftell (fp);
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if (off != test_modes[i].eof_off)
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{
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printf (", Incorrect offset after read EOF. "
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"Expected %zu but got %ld\n",
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test_modes[i].eof_off, off);
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ret |= 1;
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}
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else
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printf (", offset after EOF = %ld\n", off);
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}
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else
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putc ('\n', stdout);
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fclose (fp);
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}
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}
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return ret;
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}
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/* This test opens the file for writing, moves the file offset of the
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underlying file, writes out data and then checks if ftell trips on it. */
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static int
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do_write_test (const char *filename)
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{
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FILE *fp = NULL;
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int fd;
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int ret = 0;
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struct test
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{
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const char *mode;
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int fd_mode;
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} test_modes[] = {
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{"w", O_WRONLY | O_TRUNC},
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{"w+", O_RDWR | O_TRUNC},
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{"r+", O_RDWR}
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};
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for (int j = 0; j < 2; j++)
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{
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for (int i = 0; i < sizeof (test_modes) / sizeof (struct test); i++)
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{
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int fileret;
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printf ("\twrite: %s (file, \"%s\"): ", j == 0 ? "fopen" : "fdopen",
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test_modes[i].mode);
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if (j == 0)
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fileret = get_handles_fopen (filename, fd, fp, test_modes[i].mode);
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else
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fileret = get_handles_fdopen (filename, fd, fp,
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test_modes[i].fd_mode,
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test_modes[i].mode);
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if (fileret != 0)
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return fileret;
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/* Move offset to just before the end of the file. */
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off_t seek_ret = lseek (fd, file_len - 1, SEEK_SET);
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if (seek_ret == -1)
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{
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printf ("lseek failed: %m\n");
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ret |= 1;
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}
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/* Write some data. */
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size_t written = fputs_func (data, fp);
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if (written == EOF)
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{
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printf ("fputs[1] failed to write data\n");
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ret |= 1;
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}
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/* Verify that the offset points to the end of the file. The length
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of the file would be the original length + the length of data
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written to it - the amount by which we moved the offset using
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lseek. */
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long offset = ftell (fp);
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file_len = file_len - 1 + data_len;
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if (offset != file_len)
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{
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printf ("Incorrect offset. Expected %zu, but got %ld\n",
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file_len, offset);
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ret |= 1;
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}
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printf ("offset = %ld\n", offset);
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fclose (fp);
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}
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}
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return ret;
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}
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/* This test opens a file in append mode, writes some data, and then verifies
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that ftell does not trip over it. */
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static int
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do_append_test (const char *filename)
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{
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FILE *fp = NULL;
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int ret = 0;
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int fd;
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struct test
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{
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const char *mode;
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int fd_mode;
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} test_modes[] = {
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{"a", O_WRONLY},
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{"a+", O_RDWR}
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};
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for (int j = 0; j < 2; j++)
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{
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for (int i = 0; i < sizeof (test_modes) / sizeof (struct test); i++)
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{
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int fileret;
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printf ("\tappend: %s (file, \"%s\"): ", j == 0 ? "fopen" : "fdopen",
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test_modes[i].mode);
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if (j == 0)
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fileret = get_handles_fopen (filename, fd, fp, test_modes[i].mode);
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else
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fileret = get_handles_fdopen (filename, fd, fp,
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test_modes[i].fd_mode,
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test_modes[i].mode);
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if (fileret != 0)
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return fileret;
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/* Write some data. */
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size_t written = fputs_func (data, fp);
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if (written == EOF)
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{
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printf ("fputs[1] failed to write all data\n");
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ret |= 1;
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}
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/* Verify that the offset points to the end of the file. The file
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len is maintained by adding data_len each time to reflect the data
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written to it. */
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long offset = ftell (fp);
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file_len += data_len;
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if (offset != file_len)
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{
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printf ("Incorrect offset. Expected %zu, but got %ld\n",
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file_len, offset);
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ret |= 1;
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}
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printf ("offset = %ld\n", offset);
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fclose (fp);
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}
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}
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/* For fdopen in 'a' mode, the file descriptor should not change if the file
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is already open with the O_APPEND flag set. */
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fd = open (filename, O_WRONLY | O_APPEND, 0);
|
|
if (fd == -1)
|
|
{
|
|
printf ("open(O_APPEND) failed: %m\n");
|
|
return 1;
|
|
}
|
|
|
|
off_t seek_ret = lseek (fd, file_len - 1, SEEK_SET);
|
|
if (seek_ret == -1)
|
|
{
|
|
printf ("lseek[O_APPEND][0] failed: %m\n");
|
|
ret |= 1;
|
|
}
|
|
|
|
fp = fdopen (fd, "a");
|
|
if (fp == NULL)
|
|
{
|
|
printf ("fdopen(O_APPEND) failed: %m\n");
|
|
close (fd);
|
|
return 1;
|
|
}
|
|
|
|
off_t new_seek_ret = lseek (fd, 0, SEEK_CUR);
|
|
if (seek_ret == -1)
|
|
{
|
|
printf ("lseek[O_APPEND][1] failed: %m\n");
|
|
ret |= 1;
|
|
}
|
|
|
|
printf ("\tappend: fdopen (file, \"a\"): O_APPEND: ");
|
|
|
|
if (seek_ret != new_seek_ret)
|
|
{
|
|
printf ("incorrectly modified file offset to %jd, should be %jd",
|
|
(intmax_t) new_seek_ret, (intmax_t) seek_ret);
|
|
ret |= 1;
|
|
}
|
|
else
|
|
printf ("retained current file offset %jd", (intmax_t) seek_ret);
|
|
|
|
new_seek_ret = ftello (fp);
|
|
|
|
if (seek_ret != new_seek_ret)
|
|
{
|
|
printf (", ftello reported incorrect offset %jd, should be %jd\n",
|
|
(intmax_t) new_seek_ret, (intmax_t) seek_ret);
|
|
ret |= 1;
|
|
}
|
|
else
|
|
printf (", ftello reported correct offset %jd\n", (intmax_t) seek_ret);
|
|
|
|
fclose (fp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
do_one_test (const char *filename)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret |= do_ftell_test (filename);
|
|
ret |= do_write_test (filename);
|
|
ret |= do_append_test (filename);
|
|
ret |= do_rewind_test (filename);
|
|
ret |= do_ftruncate_test (filename);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Run a set of tests for ftell for regular files and wide mode files. */
|
|
static int
|
|
do_test (void)
|
|
{
|
|
int ret = 0;
|
|
FILE *fp = NULL;
|
|
char *filename;
|
|
size_t written;
|
|
int fd = create_temp_file ("tst-active-handler-tmp.", &filename);
|
|
|
|
if (fd == -1)
|
|
{
|
|
printf ("create_temp_file: %m\n");
|
|
return 1;
|
|
}
|
|
|
|
fp = fdopen (fd, "w");
|
|
if (fp == NULL)
|
|
{
|
|
printf ("fdopen[0]: %m\n");
|
|
close (fd);
|
|
return 1;
|
|
}
|
|
|
|
data = char_data;
|
|
data_len = strlen (char_data);
|
|
file_len = strlen (char_data);
|
|
written = fputs (data, fp);
|
|
|
|
if (written == EOF)
|
|
{
|
|
printf ("fputs[1] failed to write data\n");
|
|
ret = 1;
|
|
}
|
|
|
|
fclose (fp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Tests for regular files. */
|
|
puts ("Regular mode:");
|
|
fputs_func = (fputs_func_t) fputs;
|
|
fgets_func = (fgets_func_t) fgets;
|
|
data = char_data;
|
|
data_len = strlen (char_data);
|
|
ret |= do_one_test (filename);
|
|
|
|
/* Truncate the file before repeating the tests in wide mode. */
|
|
fp = fopen (filename, "w");
|
|
if (fp == NULL)
|
|
{
|
|
printf ("fopen failed %m\n");
|
|
return 1;
|
|
}
|
|
fclose (fp);
|
|
|
|
/* Tests for wide files. */
|
|
puts ("Wide mode:");
|
|
if (setlocale (LC_ALL, "en_US.UTF-8") == NULL)
|
|
{
|
|
printf ("Cannot set en_US.UTF-8 locale.\n");
|
|
return 1;
|
|
}
|
|
fputs_func = (fputs_func_t) fputws;
|
|
fgets_func = (fgets_func_t) fgetws;
|
|
data = wide_data;
|
|
data_len = wcslen (wide_data);
|
|
ret |= do_one_test (filename);
|
|
|
|
return ret;
|
|
}
|