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