Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include "slip_common.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <net_user.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) int slip_proto_read(int fd, void *buf, int len, struct slip_proto *slip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 	int i, n, size, start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	if(slip->more > 0){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 		i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 		while(i < slip->more){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 			size = slip_unesc(slip->ibuf[i++], slip->ibuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 					  &slip->pos, &slip->esc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 			if(size){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 				memcpy(buf, slip->ibuf, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 				memmove(slip->ibuf, &slip->ibuf[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 					slip->more - i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 				slip->more = slip->more - i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 				return size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 		slip->more = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	n = net_read(fd, &slip->ibuf[slip->pos],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 		     sizeof(slip->ibuf) - slip->pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	if(n <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	start = slip->pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	for(i = 0; i < n; i++){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		size = slip_unesc(slip->ibuf[start + i], slip->ibuf,&slip->pos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 				  &slip->esc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		if(size){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 			memcpy(buf, slip->ibuf, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 			memmove(slip->ibuf, &slip->ibuf[start+i+1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 				n - (i + 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 			slip->more = n - (i + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 			return size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) int slip_proto_write(int fd, void *buf, int len, struct slip_proto *slip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	int actual, n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	actual = slip_esc(buf, slip->obuf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	n = net_write(fd, slip->obuf, actual);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	if(n < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	else return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }