#include <u.h>#include <libc.h> staticlongioreadv(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;} longreadv(int fd, IOchunk *io, int nio){ return ioreadv(fd, io, nio, -1LL);} longpreadv(int fd, IOchunk *io, int nio, vlong off){ return ioreadv(fd, io, nio, off);}
#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);
}