blob: d32de187ce3bf5d4a40a9ebbbfe5494b138a6b0b (
plain)
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
|
// Copyright: SPDX-License-Identifier: GPL-3.0-only
#ifndef CRINGBUFFER_INTERNAL_H
#define CRINGBUFFER_INTERNAL_H
struct rbuf_t {
char *data;
// points to next byte where we can write
char *head;
// points to oldest (next to be poped) readable byte
char *tail;
// to avoid calculating data + size
// all the time
char *end;
size_t size;
size_t size_data;
};
/* this exists so that it can be tested by unit tests
* without optimization that resets head and tail to
* beginning if buffer empty
*/
inline static int rbuf_bump_tail_noopt(rbuf_t buffer, size_t bytes)
{
if (bytes > buffer->size_data)
return 0;
int i = buffer->tail - buffer->data;
buffer->tail = &buffer->data[(i + bytes) % buffer->size];
buffer->size_data -= bytes;
return 1;
}
#endif
|
