/**

   \file

   \brief This module contains common APIs declarations.

   Copyright (c) 2016 Atmel Corporation. All rights reserved.

   \asf_license_start

   \page License

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.

   2. Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.

   3. The name of Atmel may not be used to endorse or promote products derived
      from this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
   WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
   EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
   ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   POSSIBILITY OF SUCH DAMAGE.

   \asf_license_stop

*/
#include "common/include/nm_common.h"

void m2m_memcpy(uint8* pDst, uint8* pSrc, uint32 sz)
{
  if (sz == 0)
    return;

  do
  {
    *pDst = *pSrc;
    pDst++;
    pSrc++;
  } while (--sz);
}
uint8 m2m_checksum(uint8* buf, int sz)
{
  uint8 cs = 0;

  while (--sz)
  {
    cs ^= *buf;
    buf++;
  }

  return cs;
}

void m2m_memset(uint8* pBuf, uint8 val, uint32 sz)
{
  if (sz == 0)
    return;

  do
  {
    *pBuf = val;
    pBuf++;
  } while (--sz);
}

uint16 m2m_strlen(uint8 * pcStr)
{
  uint16  u16StrLen = 0;

  while (*pcStr)
  {
    u16StrLen ++;
    pcStr++;
  }

  return u16StrLen;
}

uint8 m2m_strncmp(uint8 *pcS1, uint8 *pcS2, uint16 u16Len)
{
  for ( ; u16Len > 0; pcS1++, pcS2++, --u16Len)
    if (*pcS1 != *pcS2)
      return ((*(uint8 *)pcS1 < * (uint8 *)pcS2) ? -1 : +1);
    else if (*pcS1 == '\0')
      return 0;

  return 0;
}

/* Finds the occurance of pcStr in pcIn.
  If pcStr is part of pcIn it returns a valid pointer to the start of pcStr within pcIn.
  Otherwise a NULL Pointer is returned.
*/
uint8 * m2m_strstr(uint8 *pcIn, uint8 *pcStr)
{
  uint8 u8c;
  uint16 u16StrLen;

  u8c = *pcStr++;

  if (!u8c)
    return (uint8 *) pcIn;  // Trivial empty string case

  u16StrLen = m2m_strlen(pcStr);

  do
  {
    uint8 u8Sc;

    do
    {
      u8Sc = *pcIn++;

      if (!u8Sc)
        return (uint8 *) 0;
    } while (u8Sc != u8c);
  } while (m2m_strncmp(pcIn, pcStr, u16StrLen) != 0);

  return (uint8 *) (pcIn - 1);
}

sint8 m2m_memcmp(uint8 *pu8Buff1, uint8 *pu8Buff2, uint32 u32Size)
{
  uint32  i;
  sint8   s8Result = 0;

  for (i  = 0 ; i < u32Size ; i++)
  {
    if (pu8Buff1[i] != pu8Buff2[i])
    {
      s8Result = 1;
      break;
    }
  }

  return s8Result;
}