aboutsummaryrefslogtreecommitdiff
path: root/ubi-utils/src/libubi_sysfs.c
blob: 95fd3deca636b510aededa6b65c492ff98450c93 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
/*
 * Copyright (c) International Business Machines Corp., 2006
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
 * the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * UBI (Unsorted Block Images) library.
 *
 * Author: Artem B. Bityutskiy
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>
#include <stdarg.h>

#include "config.h"
#include "libubi_int.h"

int
sysfs_read_data(const char *file, void *buf, int len)
{
	int fd;
	ssize_t rd;

	fd = open(file, O_RDONLY);
	if (fd == -1) {
		ubi_err("cannot open file %s", file);
		return -1;
	}

	rd = read(fd, buf, len);
	if (rd == -1)
		ubi_err("cannot read file %s", file);

	close(fd);

	return rd;
}

int
sysfs_read_data_subst(const char *patt, void *buf, int len, int n, ...)
{
	va_list args;
	char buf1[strlen(patt) + 20 * n];

	va_start(args, n);
	vsprintf(&buf1[0], patt, args);
	va_end(args);

	return sysfs_read_data(&buf1[0], buf, len);
}

int
sysfs_read_dev(const char *file, unsigned int *major, unsigned int *minor)
{
	int fd;
	int ret;
	ssize_t rd;
	int err = -1;
	char buf[40];

	fd = open(file, O_RDONLY);
	if (fd == -1) {
		ubi_err("cannot open file %s", file);
		return -1;
	}

	rd = read(fd, &buf[0], 20);
	if (rd == -1) {
		ubi_err("cannot read file %s", file);
		goto error;
	}
	if (rd < 4) {
		ubi_err("bad contents of file %s:", file);
		goto error;
	}

	err = -1;
	if (buf[rd -1] != '\n') {
		ubi_err("bad contents of file %s", file);
		goto error;
	}

	ret = sscanf(&buf[0], "%d:%d\n", major, minor);
	if (ret != 2) {
		ubi_err("bad contents of file %s", file);
		goto error;
	}

	err = 0;

error:
	close(fd);

	return err;
}

int
sysfs_read_dev_subst(const char *patt, unsigned int *major,
		unsigned int *minor, int n, ...)
{
	va_list args;
	char buf[strlen(patt) + 20 * n];

	va_start(args, n);
	vsprintf(&buf[0], patt, args);
	va_end(args);

	return sysfs_read_dev(&buf[0], major, minor);
}

static int
sysfs_read_ull(const char *file __unused, unsigned long long *num __unused)
{
	return 0;
}

int
sysfs_read_ull_subst(const char *patt, unsigned long long *num, int n, ...)
{
	va_list args;
	char buf[strlen(patt) + 20 * n];

	va_start(args, n);
	vsprintf(&buf[0], patt, args);
	va_end(args);

	return	sysfs_read_ull(&buf[0], num);
}

static int
sysfs_read_uint(const char *file __unused, unsigned int *num __unused)
{
	return 0;
}

int
sysfs_read_uint_subst(const char *patt, unsigned int *num, int n, ...)
{
	va_list args;
	char buf[strlen(patt) + 20 * n];

	va_start(args, n);
	vsprintf(&buf[0], patt, args);
	va_end(args);

	return	sysfs_read_uint(&buf[0], num);
}

int
sysfs_read_ll(const char *file, long long *num)
{
	int fd;
	ssize_t rd;
	int err = -1;
	char buf[20];
	char *endptr;

	fd = open(file, O_RDONLY);
	if (fd == -1)
		return -1;

	rd = read(fd, &buf[0], 20);
	if (rd == -1)
		goto out;

	if (rd < 2) {
		ubi_err("bad contents in file %s: \"%c%c...\"",
			file, buf[0], buf[1]);
		goto out_errno;
	}

	*num = strtoll(&buf[0], &endptr, 10);
	if (endptr == &buf[0] || *endptr != '\n') {
		ubi_err("bad contents in file %s: \"%c%c...\"",
			file, buf[0], buf[1]);
		goto out_errno;
	}

	if  (*num < 0) {
		ubi_err("bad number in file %s: %lld", file, *num);
		goto out_errno;
	}

	err = 0;

out_errno:
	errno = EINVAL;

out:
	close(fd);
	return err;
}

int
sysfs_read_int(const char *file, int *num)
{
	int err;
	long long res = 0;

	err = sysfs_read_ll(file, &res);
	if (err)
		return err;

	if (res < 0 || res > INT_MAX) {
		ubi_err("bad number in file %s: %lld", file, res);
		errno = EINVAL;
		return -1;
	}

	*num = res;
	return 0;
}