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
|
#undef NDEBUG
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dbg.h>
#include <ringbuffer.h>
RingBuffer *RingBuffer_create(int length)
{
RingBuffer *buffer = calloc(1, sizeof(RingBuffer));
buffer->length = length + 1;
buffer->start = 0;
buffer->end = 0;
buffer->buffer = calloc(buffer->length, 1);
return buffer;
}
void RingBuffer_destroy(RingBuffer *buffer)
{
if (buffer) {
free(buffer->buffer);
free(buffer);
}
}
int RingBuffer_write(RingBuffer *buffer, char *data, int length)
{
if (RingBuffer_available_data(buffer) == 0) {
buffer->start = buffer->end = 0;
}
check(length <= RingBuffer_available_space(buffer),
"Not enough space: %d request, %d available",
RingBuffer_available_data(buffer), length);
void *result = memcpy(RingBuffer_ends_at(buffer), data, length);
check(result != NULL, "Failed to write data into buffer");
RingBuffer_commit_write(buffer, length);
return length;
error:
return -1;
}
int RingBuffer_read(RingBuffer *buffer, char *target, int amount)
{
check_debug(amount <= RingBuffer_available_data(buffer),
"Not enough in the buffer: has %d, needs %d",
RingBuffer_available_data(buffer), amount);
void *result = memcpy(target, RingBuffer_starts_at(buffer), amount);
check(result != NULL, "Failed to write buffer into data.");
RingBuffer_commit_read(buffer, amount);
if (buffer->end == buffer->start) {
buffer->start = buffer->end = 0;
}
return amount;
error:
return -1;
}
bstring RingBuffer_gets(RingBuffer *buffer, int amount)
{
check(amount > 0, "Need more than 0 for gets, you gave: %d",
amount);
check_debug(amount <= RingBuffer_available_data(buffer),
"Not enough in the buffer");
bstring result = blk2bstr(RingBuffer_starts_at(buffer), amount);
check(result != NULL, "Failed to create gets result.");
check(blength(result) == amount, "Wrong result length.");
RingBuffer_commit_read(buffer, amount);
assert(RingBuffer_available_data(buffer) >= 0
&& "Error in read commit");
return result;
error:
return NULL;
}
|
