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/*
* Atheros AR71xx minimal nvram support
*
* Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/vmalloc.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/string.h>
#include "nvram.h"
char *ath79_nvram_find_var(const char *name, const char *buf, unsigned buf_len)
{
unsigned len = strlen(name);
char *cur, *last;
if (buf_len == 0 || len == 0)
return NULL;
if (buf_len < len)
return NULL;
if (len == 1)
return memchr(buf, (int) *name, buf_len);
last = (char *) buf + buf_len - len;
for (cur = (char *) buf; cur <= last; cur++)
if (cur[0] == name[0] && memcmp(cur, name, len) == 0)
return cur + len;
return NULL;
}
int ath79_nvram_parse_mac_addr(const char *nvram, unsigned nvram_len,
const char *name, char *mac)
{
char *buf;
char *mac_str;
int ret;
int t;
buf = vmalloc(nvram_len);
if (!buf)
return -ENOMEM;
memcpy(buf, nvram, nvram_len);
buf[nvram_len - 1] = '\0';
mac_str = ath79_nvram_find_var(name, buf, nvram_len);
if (!mac_str) {
ret = -EINVAL;
goto free;
}
if (strlen(mac_str) == 19 && mac_str[0] == '"' && mac_str[18] == '"') {
mac_str[18] = 0;
mac_str++;
}
t = sscanf(mac_str, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
&mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5]);
if (t != 6) {
ret = -EINVAL;
goto free;
}
ret = 0;
free:
vfree(buf);
return ret;
}
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