1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/* Verify that ftell returns the correct value after a read and a write on a
file opened in a+ mode.
Copyright (C) 2014-2021 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 <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;
}
|
