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/*
* 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;
}
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