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