esp-idf/components/bt/esp_ble_mesh/mesh_common/mesh_util.c

/*
 * Copyright (c) 2017 Nordic Semiconductor ASA
 * Copyright (c) 2016 Vinayak Kariappa Chettimada
 * Copyright (c) 2015-2016 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <string.h>

#include "mesh_types.h"
#include "mesh_util.h"

const char *bt_hex(const void *buf, size_t len)
{
    static const char hex[] = "0123456789abcdef";
    static char hexbufs[2][129];
    static u8_t curbuf;
    const u8_t *b = buf;
    char *str = NULL;
    int i;

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

    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;
}

void mem_rcopy(u8_t *dst, u8_t const *src, u16_t len)
{
    src += len;
    while (len--) {
        *dst++ = *--src;
    }
}