slip_common.c

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#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;
}