170 lines
3.9 KiB
C
170 lines
3.9 KiB
C
/* Verify that ftell returns the correct value after a read and a write on a
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file opened in a+ mode.
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Copyright (C) 2014-2022 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 <locale.h>
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#include <wchar.h>
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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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#define BUF_LEN 4
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static void *buf;
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static char char_buf[BUF_LEN];
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static wchar_t wide_buf[BUF_LEN];
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static const void *data;
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static const char *char_data = "abcdefghijklmnopqrstuvwxyz";
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static const wchar_t *wide_data = L"abcdefghijklmnopqrstuvwxyz";
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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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fputs_func_t fputs_func;
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typedef void *(*fgets_func_t) (void *s, int size, FILE *stream);
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fgets_func_t fgets_func;
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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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static FILE *
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init_file (const char *filename)
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{
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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 ("fopen: %m\n");
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return NULL;
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}
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int written = fputs_func (data, fp);
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if (written == EOF)
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{
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printf ("fputs failed to write data\n");
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fclose (fp);
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return NULL;
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}
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file_len = data_len;
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fclose (fp);
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fp = fopen (filename, "a+");
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if (fp == NULL)
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{
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printf ("fopen(a+): %m\n");
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return NULL;
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}
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return fp;
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}
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static int
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do_one_test (const char *filename)
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{
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FILE *fp = init_file (filename);
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if (fp == NULL)
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return 1;
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void *ret = fgets_func (buf, BUF_LEN, fp);
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if (ret == NULL)
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{
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printf ("read failed: %m\n");
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fclose (fp);
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return 1;
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}
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int written = fputs_func (data, fp);
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if (written == EOF)
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{
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printf ("fputs failed to write data\n");
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fclose (fp);
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return 1;
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}
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file_len += data_len;
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long off = ftell (fp);
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if (off != file_len)
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{
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printf ("Incorrect offset %ld, expected %zu\n", off, file_len);
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fclose (fp);
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return 1;
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}
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else
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printf ("Correct offset %ld after write.\n", off);
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return 0;
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}
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/* Run the tests for regular files and wide mode files. */
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static int
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do_test (void)
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{
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int ret = 0;
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char *filename;
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int fd = create_temp_file ("tst-ftell-append-tmp.", &filename);
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if (fd == -1)
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{
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printf ("create_temp_file: %m\n");
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return 1;
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}
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close (fd);
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/* Tests for regular files. */
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puts ("Regular mode:");
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fputs_func = (fputs_func_t) fputs;
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fgets_func = (fgets_func_t) fgets;
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data = char_data;
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buf = char_buf;
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data_len = strlen (char_data);
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ret |= do_one_test (filename);
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/* Tests for wide files. */
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puts ("Wide mode:");
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if (setlocale (LC_ALL, "en_US.UTF-8") == NULL)
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{
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printf ("Cannot set en_US.UTF-8 locale.\n");
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return 1;
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}
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fputs_func = (fputs_func_t) fputws;
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fgets_func = (fgets_func_t) fgetws;
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data = wide_data;
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buf = wide_buf;
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data_len = wcslen (wide_data);
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ret |= do_one_test (filename);
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return ret;
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}
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