Subversion Repositories planix.SVN

#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);
}