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/*
* Copyright (c) 1995 Danny Gasparovski.
*
* Please read the file COPYRIGHT for the
* terms and conditions of the copyright.
*/
#include "sbuf.h"
#include "mbuf.h"
#include "slirp_common.h"
/* Done as a macro in socket.h */
/* int
* sbspace(struct sockbuff *sb)
* {
* return SB_DATALEN - sb->sb_cc;
* }
*/
void
sbfree(sb)
struct sbuf *sb;
{
free(sb->sb_data);
}
void
sbdrop(sb, num)
struct sbuf *sb;
int num;
{
/*
* We can only drop how much we have
* This should never succeed
*/
if(num > sb->sb_cc)
num = sb->sb_cc;
sb->sb_cc -= num;
sb->sb_rptr += num;
if(sb->sb_rptr >= sb->sb_data + sb->sb_datalen)
sb->sb_rptr -= sb->sb_datalen;
}
void
sbreserve(sb, size)
struct sbuf *sb;
int size;
{
if (sb->sb_data) {
/* Already alloced, realloc if necessary */
if (sb->sb_datalen != size) {
sb->sb_wptr = sb->sb_rptr = sb->sb_data = (char *)realloc(sb->sb_data, size);
sb->sb_cc = 0;
if (sb->sb_wptr)
sb->sb_datalen = size;
else
sb->sb_datalen = 0;
}
} else {
sb->sb_wptr = sb->sb_rptr = sb->sb_data = (char *)malloc(size);
sb->sb_cc = 0;
if (sb->sb_wptr)
sb->sb_datalen = size;
else
sb->sb_datalen = 0;
}
}
/*
* Copy the data from m into sb
* The caller is responsible to make sure there's enough room
*/
void
sbappendsb(struct sbuf *sb, struct mbuf *m)
{
int len, n, nn;
len = m->m_len;
if (sb->sb_wptr < sb->sb_rptr) {
n = sb->sb_rptr - sb->sb_wptr;
if (n > len) n = len;
memcpy(sb->sb_wptr, m->m_data, n);
} else {
/* Do the right edge first */
n = sb->sb_data + sb->sb_datalen - sb->sb_wptr;
if (n > len) n = len;
memcpy(sb->sb_wptr, m->m_data, n);
len -= n;
if (len) {
/* Now the left edge */
nn = sb->sb_rptr - sb->sb_data;
if (nn > len) nn = len;
memcpy(sb->sb_data,m->m_data+n,nn);
n += nn;
}
}
sb->sb_cc += n;
sb->sb_wptr += n;
if (sb->sb_wptr >= sb->sb_data + sb->sb_datalen)
sb->sb_wptr -= sb->sb_datalen;
}
/*
* Copy data from sbuf to a normal, straight buffer
* Don't update the sbuf rptr, this will be
* done in sbdrop when the data is acked
*/
void
sbcopy(sb, off, len, to)
struct sbuf *sb;
int off;
int len;
char *to;
{
char *from;
from = sb->sb_rptr + off;
if (from >= sb->sb_data + sb->sb_datalen)
from -= sb->sb_datalen;
if (from < sb->sb_wptr) {
if (len > sb->sb_cc) len = sb->sb_cc;
memcpy(to,from,len);
} else {
/* re-use off */
off = (sb->sb_data + sb->sb_datalen) - from;
if (off > len) off = len;
memcpy(to,from,off);
len -= off;
if (len)
memcpy(to+off,sb->sb_data,len);
}
}
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