/*
 * Copyright 2016-2017, Intel Corporation
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * 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.
 *
 *     * Neither the name of the copyright holder nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS 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.
 */

/*
 * ex_common.h -- examples utilities
 */
#ifndef EX_COMMON_H
#define EX_COMMON_H

#include <stdint.h>

#define MIN(a, b)  (((a) < (b)) ? (a) : (b))

#ifdef __cplusplus
extern "C" {
#endif

#ifndef _WIN32

#include <unistd.h>

#define CREATE_MODE_RW (S_IWUSR | S_IRUSR)

/*
 * file_exists -- checks if file exists
 */
static inline int
file_exists(char const *file)
{
    return access(file, F_OK);
}

/*
 * find_last_set_64 -- returns last set bit position or -1 if set bit not found
 */
static inline int
find_last_set_64(uint64_t val)
{
    return 64 - __builtin_clzll(val) - 1;
}
#else

#include <windows.h>
#include <corecrt_io.h>
#include <process.h>

#define CREATE_MODE_RW (S_IWRITE | S_IREAD)

/*
 * file_exists -- checks if file exists
 */
static inline int
file_exists(char const *file)
{
    return _access(file, 0);
}

/*
 * find_last_set_64 -- returns last set bit position or -1 if set bit not found
 */
static inline int
find_last_set_64(uint64_t val)
{
    DWORD lz = 0;

    if (BitScanReverse64(&lz, val))
        return (int)lz;
    else
        return -1;
}
#endif

#ifdef __cplusplus
}
#endif
#endif /* ex_common.h */