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
|
// SPDX-License-Identifier: GPL-2.0
/*
* C++ stream style string builder used in KUnit for building messages.
*
* Copyright (C) 2019, Google LLC.
* Author: Brendan Higgins <brendanhiggins@google.com>
*/
#include <kunit/test.h>
#include <linux/list.h>
#include <linux/slab.h>
#include "string-stream.h"
static struct string_stream_fragment *alloc_string_stream_fragment(
struct kunit *test, int len, gfp_t gfp)
{
struct string_stream_fragment *frag;
frag = kunit_kzalloc(test, sizeof(*frag), gfp);
if (!frag)
return ERR_PTR(-ENOMEM);
frag->fragment = kunit_kmalloc(test, len, gfp);
if (!frag->fragment) {
kunit_kfree(test, frag);
return ERR_PTR(-ENOMEM);
}
return frag;
}
static void string_stream_fragment_destroy(struct kunit *test,
struct string_stream_fragment *frag)
{
list_del(&frag->node);
kunit_kfree(test, frag->fragment);
kunit_kfree(test, frag);
}
int string_stream_vadd(struct string_stream *stream,
const char *fmt,
va_list args)
{
struct string_stream_fragment *frag_container;
int len;
va_list args_for_counting;
/* Make a copy because `vsnprintf` could change it */
va_copy(args_for_counting, args);
/* Need space for null byte. */
len = vsnprintf(NULL, 0, fmt, args_for_counting) + 1;
va_end(args_for_counting);
frag_container = alloc_string_stream_fragment(stream->test,
len,
stream->gfp);
if (IS_ERR(frag_container))
return PTR_ERR(frag_container);
len = vsnprintf(frag_container->fragment, len, fmt, args);
spin_lock(&stream->lock);
stream->length += len;
list_add_tail(&frag_container->node, &stream->fragments);
spin_unlock(&stream->lock);
return 0;
}
int string_stream_add(struct string_stream *stream, const char *fmt, ...)
{
va_list args;
int result;
va_start(args, fmt);
result = string_stream_vadd(stream, fmt, args);
va_end(args);
return result;
}
static void string_stream_clear(struct string_stream *stream)
{
struct string_stream_fragment *frag_container, *frag_container_safe;
spin_lock(&stream->lock);
list_for_each_entry_safe(frag_container,
frag_container_safe,
&stream->fragments,
node) {
string_stream_fragment_destroy(stream->test, frag_container);
}
stream->length = 0;
spin_unlock(&stream->lock);
}
char *string_stream_get_string(struct string_stream *stream)
{
struct string_stream_fragment *frag_container;
size_t buf_len = stream->length + 1; /* +1 for null byte. */
char *buf;
buf = kunit_kzalloc(stream->test, buf_len, stream->gfp);
if (!buf)
return NULL;
spin_lock(&stream->lock);
list_for_each_entry(frag_container, &stream->fragments, node)
strlcat(buf, frag_container->fragment, buf_len);
spin_unlock(&stream->lock);
return buf;
}
int string_stream_append(struct string_stream *stream,
struct string_stream *other)
{
const char *other_content;
other_content = string_stream_get_string(other);
if (!other_content)
return -ENOMEM;
return string_stream_add(stream, other_content);
}
bool string_stream_is_empty(struct string_stream *stream)
{
return list_empty(&stream->fragments);
}
struct string_stream *alloc_string_stream(struct kunit *test, gfp_t gfp)
{
struct string_stream *stream;
stream = kunit_kzalloc(test, sizeof(*stream), gfp);
if (!stream)
return ERR_PTR(-ENOMEM);
stream->gfp = gfp;
stream->test = test;
INIT_LIST_HEAD(&stream->fragments);
spin_lock_init(&stream->lock);
return stream;
}
void string_stream_destroy(struct string_stream *stream)
{
string_stream_clear(stream);
}
|
