1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26 #pragma ident "%Z%%M% %I% %E% SMI"
27
28 #include <unistd.h>
29 #include <sys/stat.h>
30 #include <fcntl.h>
31
32 #include "wbio.h"
33
34 /*
35 * Write `buflen' bytes from `buffer' to the file represented by `fd'.
36 * Returns -1 if all `buflen' bytes cannot be written, otherwise returns 0.
37 */
38 int
wbio_nwrite(int fd,const void * buffer,size_t buflen)39 wbio_nwrite(int fd, const void *buffer, size_t buflen)
40 {
41 size_t nwritten;
42 ssize_t nbytes;
43 const char *buf = buffer;
44
45 for (nwritten = 0; nwritten < buflen; nwritten += nbytes) {
46 nbytes = write(fd, &buf[nwritten], buflen - nwritten);
47 if (nbytes <= 0)
48 return (-1);
49 }
50
51 return (0);
52 }
53
54 /*
55 * Read `buflen' bytes into `buffer' from the file represented by `fd'.
56 * Returns -1 if all `buflen' bytes cannot be read, otherwise returns 0.
57 */
58 int
wbio_nread(int fd,void * buffer,size_t buflen)59 wbio_nread(int fd, void *buffer, size_t buflen)
60 {
61 size_t nread;
62 ssize_t nbytes;
63 char *buf = buffer;
64
65 for (nread = 0; nread < buflen; nread += nbytes) {
66 nbytes = read(fd, &buf[nread], buflen - nread);
67 if (nbytes <= 0)
68 return (-1);
69 }
70
71 return (0);
72 }
73
74 /*
75 * Read a random number of `buflen' bytes into `buffer' from /dev/urandom.
76 * Returns -1 if all `buflen' bytes cannot be read, otherwise returns 0.
77 */
78 int
wbio_nread_rand(void * buffer,size_t buflen)79 wbio_nread_rand(void *buffer, size_t buflen)
80 {
81 int fd;
82
83 if ((fd = open("/dev/urandom", O_RDONLY)) == -1) {
84 return (-1);
85 }
86
87 if (wbio_nread(fd, buffer, buflen) != 0) {
88 (void) close(fd);
89 return (-1);
90 }
91
92 (void) close(fd);
93 return (0);
94 }
95