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#include <u.h>
#include <libc.h>
static
long
ioreadv(int fd, IOchunk *io, int nio, vlong offset)
{
int i;
long m, n, tot;
char *buf, *p;
tot = 0;
for(i=0; i<nio; i++)
tot += io[i].len;
buf = malloc(tot);
if(buf == nil)
return -1;
tot = pread(fd, buf, tot, offset);
p = buf;
n = tot;
for(i=0; i<nio; i++){
if(n <= 0)
break;
m = io->len;
if(m > n)
m = n;
memmove(io->addr, p, m);
n -= m;
p += m;
io++;
}
free(buf);
return tot;
}
long
readv(int fd, IOchunk *io, int nio)
{
return ioreadv(fd, io, nio, -1LL);
}
long
preadv(int fd, IOchunk *io, int nio, vlong off)
{
return ioreadv(fd, io, nio, off);
}
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