C语言实现字符串替换

char * replace_all(char* src, const char* old_value, const char* new_value)
{
    char* ReturnArray = new char[512];
    memset(ReturnArray, 0, sizeof(ReturnArray));
  //i love fishc -> Apple replace e ->i lovApple fishc
    int length = strlen(src);
    char* srcEnd = src + length;
    char* tmpPoint = ReturnArray;
    int old_length = strlen(old_value);

    while (src < srcEnd)
    {
        if (*src != old_value[0])
        {
            *tmpPoint++ = *src++;
        }
        else
        {
            int nCount = 0;

            if (src + strlen(old_value) > srcEnd)
            {
                *tmpPoint++ = *src++;
            }
            else
            {
                for (int j = 0; j < strlen(old_value); ++j)
                {
                    if (src[j] == old_value[j])
                        nCount++;
                }

                if (nCount == strlen(old_value))
                {
                    for (int j = 0; j < strlen(new_value); ++j)
                    {
                        *tmpPoint++ = new_value[j];
                    }
                    src += strlen(old_value);
                }
                else
                {
                    *tmpPoint++ = *src++;
                }
            }
          
        }
    }
    *tmpPoint = '';

    return ReturnArray;
}