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
170
171
172
173
174
175
176
177
|
/* Test fwrite on a memory stream.
Copyright (C) 2024-2025 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 <support/check.h>
#include <support/temp_file.h>
#include <support/xstdio.h>
#include <support/xunistd.h>
void
test_ro (void)
{
FILE *f;
char *out;
/* Try to allocate a small buffer for this test. */
out = malloc (2);
TEST_VERIFY_EXIT (out != NULL);
/* Try to open the allocated buffer as a read-only stream. */
f = fmemopen (out, 2, "r");
TEST_VERIFY_EXIT (f != NULL);
/* Try to write to the temporary file with nmemb = 0, then check that
fwrite returns 0. No errors are expected from this. */
TEST_COMPARE (fwrite ("a", 1, 0, f), 0);
TEST_COMPARE (ferror (f), 0);
/* Try to write to the temporary file with size = 0, then check that
fwrite returns 0. No errors are expected from this. */
TEST_COMPARE (fwrite ("a", 0, 1, f), 0);
TEST_COMPARE (ferror (f), 0);
/* Try to write a single byte to the temporary file, then check that
fwrite returns 0. Check if an error was reported. */
TEST_COMPARE (fwrite ("a", 1, 1, f), 0);
TEST_COMPARE (ferror (f), 1);
clearerr (f);
xfclose (f);
free (out);
}
/* Length of the output buffer in bytes. */
#define RWBUF_SIZE 16 * 1024
/* Maximum number of bytes to be written in output buffer. The rest will be
used to check against overflow. */
#define RWBUF_SIZE_WRITABLE RWBUF_SIZE-2048
/* Use the following byte to identify areas that should have not been
modified. */
#define KNOWN_BYTE 0xaa
void
test_one_rw (const char *in, size_t size, size_t nmemb,
size_t expected_ret)
{
FILE *f;
char *out, *expected_out;
/* Total number of bytes expected to be written. */
size_t expected_bytes = size * nmemb;
printf ("Testing with size = %zd, nmemb = %zd\n", size, nmemb);
TEST_VERIFY_EXIT (expected_ret <= RWBUF_SIZE_WRITABLE);
TEST_VERIFY_EXIT (expected_bytes <= RWBUF_SIZE_WRITABLE);
/* Try to allocate a buffer for this test and initialize it with
known contents. */
out = malloc (RWBUF_SIZE);
TEST_VERIFY_EXIT (out != NULL);
memset (out, KNOWN_BYTE, RWBUF_SIZE);
/* Try to allocate a buffer and fill it with the contents that are expected
to be in memory after flushing/closing the memory stream. */
expected_out = malloc (RWBUF_SIZE);
TEST_VERIFY_EXIT (expected_out != NULL);
if (expected_bytes > 0)
{
memcpy (expected_out, in, expected_bytes);
expected_out[expected_bytes] = 0;
memset (expected_out + expected_bytes + 1, KNOWN_BYTE,
RWBUF_SIZE - expected_bytes - 1);
}
else
{
/* No changes to the output are expected. */
memset (expected_out, KNOWN_BYTE, RWBUF_SIZE);
}
/* Try to open the allocated buffer as a read-write stream. */
f = fmemopen (out, RWBUF_SIZE, "w");
TEST_VERIFY_EXIT (f != NULL);
/* Try to write to the memory stream. Check if fwrite() returns the
expected value. No errors are expected. */
TEST_COMPARE (fwrite (in, size, nmemb, f), expected_ret);
TEST_COMPARE (ferror (f), 0);
xfclose (f);
/* Ensure the output has the expected contents. */
TEST_COMPARE (memcmp (out, expected_out, expected_bytes), 0);
free (expected_out);
free (out);
}
void
test_rw (void)
{
char * in;
int i, j;
size_t size[] = {1, 8, 11, 16, 17, 0};
size_t nmemb[] = {32, 83, 278, 709, 4097, RWBUF_SIZE / 2,
RWBUF_SIZE_WRITABLE, 0};
size_t n;
/* Try to write to the temporary file with nmemb = 0, then check that
fwrite returns 0; */
test_one_rw ("a", 1, 0, 0);
/* Try to write to the temporary file with size = 0, then check that
fwrite returns 0; */
test_one_rw ("a", 0, 1, 0);
/* Try to write a single byte to the temporary file, then check that
fwrite returns 1; */
test_one_rw ("a", 1, 2, 2);
in = malloc (RWBUF_SIZE);
TEST_VERIFY_EXIT (in != NULL);
for (i = 0; i < RWBUF_SIZE / 2; i++)
in[i] = i % 0xff;
/* Test with all posibilities of size[] x nmemb[]. */
for (i = 0; nmemb[i] != 0; i++)
{
for (j = 0; size[j] != 0; j++)
{
n = nmemb[i] / size[j];
test_one_rw (in, size[j], n, n);
}
/* Run the test with a single item of maximum size. */
test_one_rw (in, nmemb[i], 1, 1);
}
free (in);
}
static int
do_test (void)
{
test_ro ();
test_rw ();
return 0;
}
#include <support/test-driver.c>
|
