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glibc/libio/tst-ftell-append.c
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/* Verify that ftell returns the correct value after a read and a write on a | |
file opened in a+ mode. | |
Copyright (C) 2014-2016 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 | |
<http://www.gnu.org/licenses/>. */ | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <errno.h> | |
#include <unistd.h> | |
#include <locale.h> | |
#include <wchar.h> | |
/* data points to either char_data or wide_data, depending on whether we're | |
testing regular file mode or wide mode respectively. Similarly, | |
fputs_func points to either fputs or fputws. data_len keeps track of the | |
length of the current data and file_len maintains the current file | |
length. */ | |
#define BUF_LEN 4 | |
static void *buf; | |
static char char_buf[BUF_LEN]; | |
static wchar_t wide_buf[BUF_LEN]; | |
static const void *data; | |
static const char *char_data = "abcdefghijklmnopqrstuvwxyz"; | |
static const wchar_t *wide_data = L"abcdefghijklmnopqrstuvwxyz"; | |
static size_t data_len; | |
static size_t file_len; | |
typedef int (*fputs_func_t) (const void *data, FILE *fp); | |
fputs_func_t fputs_func; | |
typedef void *(*fgets_func_t) (void *s, int size, FILE *stream); | |
fgets_func_t fgets_func; | |
static int do_test (void); | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" | |
static FILE * | |
init_file (const char *filename) | |
{ | |
FILE *fp = fopen (filename, "w"); | |
if (fp == NULL) | |
{ | |
printf ("fopen: %m\n"); | |
return NULL; | |
} | |
int written = fputs_func (data, fp); | |
if (written == EOF) | |
{ | |
printf ("fputs failed to write data\n"); | |
fclose (fp); | |
return NULL; | |
} | |
file_len = data_len; | |
fclose (fp); | |
fp = fopen (filename, "a+"); | |
if (fp == NULL) | |
{ | |
printf ("fopen(a+): %m\n"); | |
return NULL; | |
} | |
return fp; | |
} | |
static int | |
do_one_test (const char *filename) | |
{ | |
FILE *fp = init_file (filename); | |
if (fp == NULL) | |
return 1; | |
void *ret = fgets_func (buf, BUF_LEN, fp); | |
if (ret == NULL) | |
{ | |
printf ("read failed: %m\n"); | |
fclose (fp); | |
return 1; | |
} | |
int written = fputs_func (data, fp); | |
if (written == EOF) | |
{ | |
printf ("fputs failed to write data\n"); | |
fclose (fp); | |
return 1; | |
} | |
file_len += data_len; | |
long off = ftell (fp); | |
if (off != file_len) | |
{ | |
printf ("Incorrect offset %ld, expected %zu\n", off, file_len); | |
fclose (fp); | |
return 1; | |
} | |
else | |
printf ("Correct offset %ld after write.\n", off); | |
return 0; | |
} | |
/* Run the tests for regular files and wide mode files. */ | |
static int | |
do_test (void) | |
{ | |
int ret = 0; | |
char *filename; | |
int fd = create_temp_file ("tst-ftell-append-tmp.", &filename); | |
if (fd == -1) | |
{ | |
printf ("create_temp_file: %m\n"); | |
return 1; | |
} | |
close (fd); | |
/* Tests for regular files. */ | |
puts ("Regular mode:"); | |
fputs_func = (fputs_func_t) fputs; | |
fgets_func = (fgets_func_t) fgets; | |
data = char_data; | |
buf = char_buf; | |
data_len = strlen (char_data); | |
ret |= do_one_test (filename); | |
/* 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; | |
buf = wide_buf; | |
data_len = wcslen (wide_data); | |
ret |= do_one_test (filename); | |
return ret; | |
} |