Rune*
getblock(int atl, int iof)
{
int bno, off;
static uchar ibuff[BLKSIZE];
static uchar obuff[BLKSIZE];
bno = atl / (BLKSIZE/sizeof(Rune));
off = (atl*sizeof(Rune)) & (BLKSIZE-1) & ~03;
if(bno >= NBLK) {
lastc = '\n';
error(T);
}
nleft = BLKSIZE - off;
if(bno == iblock) {
ichanged |= iof;
return (Rune*)(ibuff+off);
}
if(bno == oblock)
return (Rune*)(obuff+off);
if(iof == OREAD) {
if(ichanged)
blkio(iblock, ibuff, 0);
ichanged = 0;
iblock = bno;
blkio(bno, ibuff, 1);
return (Rune*)(ibuff+off);
}
if(oblock >= 0)
blkio(oblock, obuff, 0);
oblock = bno;
return (Rune*)(obuff+off);
}
char *
getblock(unsigned int atl, int iof)
{
int bno, off;
bno = (atl/(BLKSIZE/2));
off = (atl<<1) & (BLKSIZE-1) & ~03;
if (bno >= NBLK) {
lastc = '\n';
error(T);
}
nleft = BLKSIZE - off;
if (bno==iblock) {
ichanged |= iof;
return(ibuff+off);
}
if (bno==oblock)
return(obuff+off);
if (iof==READ) {
if (ichanged)
blkio(iblock, ibuff, write);
ichanged = 0;
iblock = bno;
blkio(bno, ibuff, read);
return(ibuff+off);
}
if (oblock>=0)
blkio(oblock, obuff, write);
oblock = bno;
return(obuff+off);
}
