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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
23 */
24
25#include <stdio.h>
26#include <libintl.h>
27#include <errno.h>
28#include <assert.h>
29#include <unistd.h>
30#include "bblk_einfo.h"
31#include "boot_utils.h"
32
33boolean_t boot_debug = B_FALSE;
34boolean_t nowrite = B_FALSE;
35
36void
37boot_gdebug(const char *funcname, char *format, ...)
38{
39	va_list ap;
40
41	if (boot_debug == B_FALSE)
42		return;
43
44	(void) fprintf(stdout, "%s(): ", funcname);
45
46	va_start(ap, format);
47	/* LINTED: E_SEC_PRINTF_VAR_FMT */
48	(void) vfprintf(stdout, format, ap);
49	va_end(ap);
50}
51
52/*
53 * Common functions to write out and read in block-sized data to a file
54 * descriptor.
55 */
56int
57write_out(int fd, void *buffer, size_t size, off_t off)
58{
59	int		ret;
60	char		*buf = buffer;
61
62	if (size % SECTOR_SIZE != 0)
63		BOOT_DEBUG("Expected block-sized data, got: %d\n", size);
64
65	/* Dry run. */
66	if (nowrite)
67		return (BC_SUCCESS);
68
69	for (;;) {
70	again:
71		ret = pwrite(fd, buf, size, off);
72		if (ret == -1) {
73			if (errno == EAGAIN)
74				goto again;
75			else
76				return (BC_ERROR);
77			}
78		if (ret < size) {
79			size -= ret;
80			off += ret;
81			buf += ret;
82		} else {
83			break;
84		}
85	}
86	return (BC_SUCCESS);
87}
88
89int
90read_in(int fd, void *buffer, size_t size, off_t off)
91{
92	int		ret;
93	char		*buf = buffer;
94
95	if (size % SECTOR_SIZE != 0)
96		BOOT_DEBUG("Expected block-sized data, got: %d\n", size);
97
98	for (;;) {
99	again:
100		ret = pread(fd, buf, size, off);
101		if (ret == -1) {
102			if (errno == EAGAIN)
103				goto again;
104			else
105				return (BC_ERROR);
106			}
107		if (ret < size) {
108			size -= ret;
109			off += ret;
110			buf += ret;
111		} else {
112			break;
113		}
114	}
115	return (BC_SUCCESS);
116}
117