/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "wbio.h"
/*
* Write `buflen' bytes from `buffer' to the file represented by `fd'.
* Returns -1 if all `buflen' bytes cannot be written, otherwise returns 0.
*/
int
wbio_nwrite(int fd, const void *buffer, size_t buflen)
{
size_t nwritten;
ssize_t nbytes;
const char *buf = buffer;
for (nwritten = 0; nwritten < buflen; nwritten += nbytes) {
nbytes = write(fd, &buf[nwritten], buflen - nwritten);
if (nbytes <= 0)
return (-1);
}
return (0);
}
/*
* Read `buflen' bytes into `buffer' from the file represented by `fd'.
* Returns -1 if all `buflen' bytes cannot be read, otherwise returns 0.
*/
int
wbio_nread(int fd, void *buffer, size_t buflen)
{
size_t nread;
ssize_t nbytes;
char *buf = buffer;
for (nread = 0; nread < buflen; nread += nbytes) {
nbytes = read(fd, &buf[nread], buflen - nread);
if (nbytes <= 0)
return (-1);
}
return (0);
}
/*
* Read a random number of `buflen' bytes into `buffer' from /dev/urandom.
* Returns -1 if all `buflen' bytes cannot be read, otherwise returns 0.
*/
int
wbio_nread_rand(void *buffer, size_t buflen)
{
int fd;
if ((fd = open("/dev/urandom", O_RDONLY)) == -1) {
return (-1);
}
if (wbio_nread(fd, buffer, buflen) != 0) {
(void) close(fd);
return (-1);
}
(void) close(fd);
return (0);
}