read-full.c revision 2d566ba9c304ffa14cd1f8f39e1d9fd432be9db5
/* Copyright (c) 2003 Timo Sirainen */
#include "lib.h"
#include "read-full.h"
#include <unistd.h>
int read_full(int fd, void *data, size_t size)
{
ssize_t ret;
while (size > 0) {
ret = read(fd, data, size < SSIZE_T_MAX ? size : SSIZE_T_MAX);
if (ret <= 0)
return ret;
data = PTR_OFFSET(data, ret);
size -= ret;
}
return 1;
}
int pread_full(int fd, void *data, size_t size, off_t offset)
{
ssize_t ret;
while (size > 0) {
ret = pread(fd, data, size < SSIZE_T_MAX ?
size : SSIZE_T_MAX, offset);
if (ret <= 0)
return ret;
data = PTR_OFFSET(data, ret);
size -= ret;
offset += ret;
}
return 1;
}