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(slip->ibuf[i++], slip->ibuf,
14 &slip->pos, &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(slip->ibuf[start + i], slip->ibuf,&slip->pos,
34 &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(buf, slip->obuf, len);
51 n = net_write(fd, slip->obuf, actual);
52 if(n < 0)
53 return n;
54 else return len;
55 }
56
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