while(n > 0){
setcache(b, q0);
off = q0-b->cq;
if(b->cnc+n <= Maxblock){
/* Everything fits in one block. */
t = b->cnc+n;
m = n;
if(b->bl == nil){ /* allocate */
if(b->cnc != 0)
panic("internal error: bufinsert1 cnc!=0");
addblock(b, 0, t);
b->cbi = 0;
}
sizecache(b, t);
runemove(b->c+off+m, b->c+off, b->cnc-off);
runemove(b->c+off, s, m);
b->cnc = t;
goto Tail;
}
/*
* We must make a new block. If q0 is at
* the very beginning or end of this block,
* just make a new block and fill it.
*/
if(q0==b->cq || q0==b->cq+b->cnc){
if(b->cdirty)
flush(b);
m = min(n, Maxblock);
if(b->bl == nil){ /* allocate */
if(b->cnc != 0)
panic("internal error: bufinsert2 cnc!=0");
i = 0;
}else{
i = b->cbi;
if(q0 > b->cq)
i++;
}
addblock(b, i, m);
sizecache(b, m);
runemove(b->c, s, m);
b->cq = q0;
b->cbi = i;
b->cnc = m;
goto Tail;
}
/*
* Split the block; cut off the right side and
* let go of it.
*/
m = b->cnc-off;
if(m > 0){
i = b->cbi+1;
addblock(b, i, m);
diskwrite(disk, &b->bl[i], b->c+off, m);
b->cnc -= m;
}
/*
* Now at end of block. Take as much input
* as possible and tack it on end of block.
*/
m = min(n, Maxblock-b->cnc);
sizecache(b, b->cnc+m);
runemove(b->c+b->cnc, s, m);
b->cnc += m;
Tail:
b->nc += m;
q0 += m;
s += m;
n -= m;
b->cdirty = TRUE;
}
}
void
bufdelete(Buffer *b, uint q0, uint q1)
{
uint m, n, off;
uint
bufload(Buffer *b, uint q0, int fd, int *nulls)
{
char *p;
Rune *r;
int l, m, n, nb, nr;
uint q1;
if(q0 > b->nc)
panic("internal error: bufload");
p = malloc((Maxblock+UTFmax+1)*sizeof p[0]);
if(p == nil)
panic("bufload: malloc failed");
r = runemalloc(Maxblock);
m = 0;
n = 1;
q1 = q0;
/*
* At top of loop, may have m bytes left over from
* last pass, possibly representing a partial rune.
*/
while(n > 0){
n = read(fd, p+m, Maxblock);
if(n < 0){
error(Ebufload);
break;
}
m += n;
p[m] = 0;
l = m;
if(n > 0)
l -= UTFmax;
cvttorunes(p, l, r, &nb, &nr, nulls);
memmove(p, p+nb, m-nb);
m -= nb;
bufinsert(b, q1, r, nr);
q1 += nr;
}
free(p);
free(r);
return q1-q0;
}