[linux-block.git] / lib / net_utils.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/string.h>
#include <linux/if_ether.h>
#include <linux/ctype.h>
#include <linux/kernel.h>

bool mac_pton(const char *s, u8 *mac)
{
	size_t maxlen = 3 * ETH_ALEN - 1;
	int i;

	/* XX:XX:XX:XX:XX:XX */
	if (strnlen(s, maxlen) < maxlen)
		return false;

	/* Don't dirty result unless string is valid MAC. */
	for (i = 0; i < ETH_ALEN; i++) {
		if (!isxdigit(s[i * 3]) || !isxdigit(s[i * 3 + 1]))
			return false;
		if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':')
			return false;
	}
	for (i = 0; i < ETH_ALEN; i++) {
		mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]);
	}
	return true;
}
EXPORT_SYMBOL(mac_pton);
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <linux/string.h>
	3	#include <linux/if_ether.h>
	4	#include <linux/ctype.h>
	5	#include <linux/kernel.h>
	6
	7	bool mac_pton(const char s, u8 mac)
	8	{
	9	size_t maxlen = 3 * ETH_ALEN - 1;
	10	int i;
	11
	12	/* XX:XX:XX:XX:XX:XX */
	13	if (strnlen(s, maxlen) < maxlen)
	14	return false;
	15
	16	/* Don't dirty result unless string is valid MAC. */
	17	for (i = 0; i < ETH_ALEN; i++) {
	18	if (!isxdigit(s[i * 3]) \|\| !isxdigit(s[i * 3 + 1]))
	19	return false;
	20	if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':')
	21	return false;
	22	}
	23	for (i = 0; i < ETH_ALEN; i++) {
	24	mac[i] = (hex_to_bin(s[i * 3]) << 4) \| hex_to_bin(s[i * 3 + 1]);
	25	}
	26	return true;
	27	}
	28	EXPORT_SYMBOL(mac_pton);