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
|
/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2025 Keith Packard
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define _DEFAULT_SOURCE
#include <stdio.h>
#include <stdlib.h>
#ifndef TEST_FILE_NAME
#define TEST_FILE_NAME "SETVBUF.TXT"
#endif
#define check(condition, message, format, ...) \
do { \
if (!(condition)) { \
printf("%s: %s ", message, #condition); \
printf(format, ##__VA_ARGS__); \
if (f) \
fclose(f); \
(void)remove(TEST_FILE_NAME); \
exit(1); \
} \
} while (0)
#define MESSAGE "hello, world\n"
#define ONE_CHAR "h"
static void
check_contents(const char *contents)
{
FILE *f;
const char *s;
int r;
int c;
f = fopen(TEST_FILE_NAME, "r");
check(f != NULL, "fopen r", "%s\n", TEST_FILE_NAME);
for (s = contents; *s; s++) {
c = getc(f);
check((char)c == *s, "contents", "got %d expect %d\n", c, *s);
}
c = getc(f);
check(c == EOF, "EOF", "got %d expected EOF\n", c);
r = fclose(f);
f = NULL;
check(r == 0, "fclose r", "got %d\n", r);
}
#define MY_BUFSIZ 512
static char mybuf[MY_BUFSIZ];
int
main(void)
{
FILE *f;
int ret;
/* Check _IOFBF mode */
f = fopen(TEST_FILE_NAME, "w");
check(f != NULL, "fopen w", "got NULL\n");
ret = setvbuf(f, mybuf, _IOFBF, sizeof(mybuf));
check(ret == 0, "setvbuf _IOFBF mybuf", "got %d expected 0\n", ret);
fputs(MESSAGE, f);
fclose(f);
check_contents(MESSAGE);
/* Check _IOFBF mode with library-allocated buffer */
f = fopen(TEST_FILE_NAME, "w");
check(f != NULL, "fopen w", "got NULL\n");
ret = setvbuf(f, NULL, _IOFBF, MY_BUFSIZ);
check(ret == 0, "setvbuf _IOFBF mybuf", "got %d expected 0\n", ret);
fputs(MESSAGE, f);
fclose(f);
check_contents(MESSAGE);
/* Check _IOLBF mode */
f = fopen(TEST_FILE_NAME, "w");
check(f != NULL, "fopen w", "got NULL\n");
ret = setvbuf(f, mybuf, _IOLBF, sizeof(mybuf));
check(ret == 0, "setvbuf _IOLBF mybuf", "got %d expected 0\n", ret);
fputs(MESSAGE, f);
/* Make sure the contents are in the file immediately */
check_contents(MESSAGE);
fclose(f);
/* Make sure the contents haven't changed */
check_contents(MESSAGE);
/* Check _IOLBF mode with library allocated buffer */
f = fopen(TEST_FILE_NAME, "w");
check(f != NULL, "fopen w", "got NULL\n");
ret = setvbuf(f, NULL, _IOLBF, MY_BUFSIZ);
check(ret == 0, "setvbuf _IOLBF NULL", "got %d\n", ret);
fputs(MESSAGE, f);
/* Make sure the contents are in the file immediately */
check_contents(MESSAGE);
fclose(f);
/* Make sure the contents haven't changed */
check_contents(MESSAGE);
/* Check _IONBF mode */
f = fopen(TEST_FILE_NAME, "w");
check(f != NULL, "fopen w", "got NULL\n");
ret = setvbuf(f, NULL, _IONBF, 0);
check(ret == 0, "setvbuf _IONBF NULL", "got %d expected 0\n", ret);
fputs(ONE_CHAR, f);
/* Make sure the contents are in the file immediately */
check_contents(ONE_CHAR);
fclose(f);
/* Make sure the contents haven't changed */
check_contents(ONE_CHAR);
(void)remove(TEST_FILE_NAME);
return 0;
}
|
