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| // SPDX-License-Identifier: GPL-2.0
| #include <string.h>
| #include "slip_common.h"
| #include <net_user.h>
|
| int slip_proto_read(int fd, void *buf, int len, struct slip_proto *slip)
| {
| int i, n, size, start;
|
| if(slip->more > 0){
| i = 0;
| while(i < slip->more){
| size = slip_unesc(slip->ibuf[i++], slip->ibuf,
| &slip->pos, &slip->esc);
| if(size){
| memcpy(buf, slip->ibuf, size);
| memmove(slip->ibuf, &slip->ibuf[i],
| slip->more - i);
| slip->more = slip->more - i;
| return size;
| }
| }
| slip->more = 0;
| }
|
| n = net_read(fd, &slip->ibuf[slip->pos],
| sizeof(slip->ibuf) - slip->pos);
| if(n <= 0)
| return n;
|
| start = slip->pos;
| for(i = 0; i < n; i++){
| size = slip_unesc(slip->ibuf[start + i], slip->ibuf,&slip->pos,
| &slip->esc);
| if(size){
| memcpy(buf, slip->ibuf, size);
| memmove(slip->ibuf, &slip->ibuf[start+i+1],
| n - (i + 1));
| slip->more = n - (i + 1);
| return size;
| }
| }
| return 0;
| }
|
| int slip_proto_write(int fd, void *buf, int len, struct slip_proto *slip)
| {
| int actual, n;
|
| actual = slip_esc(buf, slip->obuf, len);
| n = net_write(fd, slip->obuf, actual);
| if(n < 0)
| return n;
| else return len;
| }
|
|
