+/*
+ * 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 *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 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 = nvram_find_var(name, buf, nvram_len);
+ if (!mac_str) {
+ ret = -EINVAL;
+ goto free;
+ }
+
+ 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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