1// SPDX-License-Identifier: GPL-2.0
 2#include <string.h>
 3#include "slip_common.h"
 4#include <net_user.h>
 5
 6int 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
46int 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}

 1// SPDX-License-Identifier: GPL-2.0
 2#include <string.h>
 3#include "slip_common.h"
 4#include <net_user.h>
 5
 6int 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
46int 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}