net/bluetooth/log.c

/* log.c - logging helpers */

/*
 * Copyright (c) 2016 Intel Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* Helper for printk parameters to convert from binary to hex.
 * We declare multiple buffers so the helper can be used multiple times
 * in a single printk call.
 */

#include <stddef.h>
#include <stdint.h>
#include <nanokernel.h>
#include <misc/util.h>

#include <bluetooth/log.h>

const char *bt_hex(const void *buf, size_t len)
{
	static const char hex[] = "0123456789abcdef";
	static char hexbufs[4][129];
	static uint8_t curbuf;
	const uint8_t *b = buf;
	unsigned int mask;
	char *str;
	int i;

	mask = irq_lock();
	str = hexbufs[curbuf++];
	curbuf %= ARRAY_SIZE(hexbufs);
	irq_unlock(mask);

	len = min(len, (sizeof(hexbufs[0]) - 1) / 2);

	for (i = 0; i < len; i++) {
		str[i * 2]     = hex[b[i] >> 4];
		str[i * 2 + 1] = hex[b[i] & 0xf];
	}

	str[i * 2] = '\0';

	return str;
}