1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include <string.h> |
3 | #include "slip_common.h" |
4 | #include <net_user.h> |
5 | |
6 | int slip_proto_read(int fd, void *buf, int len, struct slip_proto *slip) |
7 | { |
8 | int i, n, size, start; |
9 | |
10 | if(slip->more > 0){ |
11 | i = 0; |
12 | while(i < slip->more){ |
13 | size = slip_unesc(c: slip->ibuf[i++], buf: slip->ibuf, |
14 | pos: &slip->pos, esc: &slip->esc); |
15 | if(size){ |
16 | memcpy(buf, slip->ibuf, size); |
17 | memmove(slip->ibuf, &slip->ibuf[i], |
18 | slip->more - i); |
19 | slip->more = slip->more - i; |
20 | return size; |
21 | } |
22 | } |
23 | slip->more = 0; |
24 | } |
25 | |
26 | n = net_read(fd, &slip->ibuf[slip->pos], |
27 | sizeof(slip->ibuf) - slip->pos); |
28 | if(n <= 0) |
29 | return n; |
30 | |
31 | start = slip->pos; |
32 | for(i = 0; i < n; i++){ |
33 | size = slip_unesc(c: slip->ibuf[start + i], buf: slip->ibuf,pos: &slip->pos, |
34 | esc: &slip->esc); |
35 | if(size){ |
36 | memcpy(buf, slip->ibuf, size); |
37 | memmove(slip->ibuf, &slip->ibuf[start+i+1], |
38 | n - (i + 1)); |
39 | slip->more = n - (i + 1); |
40 | return size; |
41 | } |
42 | } |
43 | return 0; |
44 | } |
45 | |
46 | int slip_proto_write(int fd, void *buf, int len, struct slip_proto *slip) |
47 | { |
48 | int actual, n; |
49 | |
50 | actual = slip_esc(s: buf, d: slip->obuf, len); |
51 | n = net_write(fd, slip->obuf, actual); |
52 | if(n < 0) |
53 | return n; |
54 | else return len; |
55 | } |
56 | |