1  /*
 2   * Copyright (c) 2017 Nordic Semiconductor ASA
 3   * Copyright (c) 2016 Vinayak Kariappa Chettimada
 4   * Copyright (c) 2015-2016 Intel Corporation
 5   *
 6   * SPDX-License-Identifier: Apache-2.0
 7   */
 8  
 9  #include <string.h>
10  
11  #include "mesh_types.h"
12  #include "mesh_util.h"
13  
14  const char *bt_hex(const void *buf, size_t len)
15  {
16      static const char hex[] = "0123456789abcdef";
17      static char hexbufs[2][129];
18      static u8_t curbuf;
19      const u8_t *b = buf;
20      char *str = NULL;
21      int i;
22  
23      str = hexbufs[curbuf++];
24      curbuf %= ARRAY_SIZE(hexbufs);
25  
26      len = MIN(len, (sizeof(hexbufs[0]) - 1) / 2);
27  
28      for (i = 0; i < len; i++) {
29          str[i * 2]     = hex[b[i] >> 4];
30          str[i * 2 + 1] = hex[b[i] & 0xf];
31      }
32  
33      str[i * 2] = '\0';
34  
35      return str;
36  }
37  
38  void mem_rcopy(u8_t *dst, u8_t const *src, u16_t len)
39  {
40      src += len;
41      while (len--) {
42          *dst++ = *--src;
43      }
44  }