/*
 * %CopyrightBegin%
 * 
 * Copyright Ericsson AB 1997-2014. All Rights Reserved.
 * 
 * The contents of this file are subject to the Erlang Public License,
 * Version 1.1, (the "License"); you may not use this file except in
 * compliance with the License. You should have received a copy of the
 * Erlang Public License along with this software. If not, it can be
 * retrieved online at http://www.erlang.org/.
 * 
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 * 
 * %CopyrightEnd%
 */
/*
 * This file handles differences between operating systems.
 * This should be the only place with conditional compilation
 * depending on the type of OS.
 */

#ifndef _ERL_WIN_SYS_H
#define _ERL_WIN_SYS_H

#define HAS_STDARG

#ifdef __GNUC__
#ifdef pid_t
/* Really... */
#undef pid_t
#endif
#endif
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <limits.h>
#include <process.h>
#include <malloc.h>
#ifndef __GNUC__
#include <direct.h>
#endif
#include "erl_errno.h"
#include <io.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <sys/timeb.h>
#pragma comment(linker,"/manifestdependency:\"type='win32' "\
		"name='Microsoft.Windows.Common-Controls' "\
		"version='6.0.0.0' processorArchitecture='*' "\
		"publicKeyToken='6595b64144ccf1df' language='*'\"")

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#undef WIN32_LEAN_AND_MEAN


#ifndef MAXPATHLEN
#define MAXPATHLEN 4096
/*
   erts-6.0 (OTP 17.0):
   We now accept windows paths longer than 260 (MAX_PATH) by conversion to
   UNC path format. In order to also return long paths from the driver we
   increased MAXPATHLEN from 260 to larger (but arbitrary) value 4096.
   It would of course be nicer to instead dynamically allocate large enough
   tmp buffers when efile_drv needs to return really long paths, and do that
   for unix as well.
 */
#endif /* MAXPATHLEN */

/*
 * Various configuration options, used to be in the Makefile.
 */

#define NO_ASINH
#define NO_ACOSH
#define NO_ATANH
#define NO_ERF
#define NO_ERFC

#define NO_SYSCONF
#define NO_DAEMON
#define NO_PWD
/*#define HAVE_MEMMOVE*/

#define strncasecmp _strnicmp

#ifndef __GNUC__
#  undef ERTS_I64_LITERAL
#  define ERTS_I64_LITERAL(X) X##i64
#endif

#define ERTS_HAVE_ERTS_SYS_ALIGNED_ALLOC 1

/*
 * Practial Windows specific macros.
 */

#define CreateAutoEvent(state) CreateEvent(NULL, FALSE, state, NULL)
#define CreateManualEvent(state) CreateEvent(NULL, TRUE, state, NULL)

/*
 * Min number of async threads
 */
#define ERTS_MIN_NO_OF_ASYNC_THREADS 0

/*
 * Our own type of "FD's"
 */
#define ERTS_SYS_FD_INVALID INVALID_HANDLE_VALUE
#define ERTS_SYS_FD_TYPE HANDLE
#define NO_FSTAT_ON_SYS_FD_TYPE 1 /* They are events, not files */

/*
 * For erl_time_sup
 */
#define HAVE_GETHRTIME

#define sys_init_hrtime() /* Nothing */

#define SYS_CLK_TCK 1000
#define SYS_CLOCK_RESOLUTION 1

#if SIZEOF_TIME_T != 8
#  error "Unexpected sizeof(time_t)"
#endif

/*
 * gcc uses a 4 byte time_t and vc++ uses an 8 byte time_t.
 * Types seen in beam_emu.c *need* to have the same size
 * as in the rest of the system...
 */
typedef __int64 erts_time_t;

struct tm *sys_localtime_r(time_t *epochs, struct tm *ptm);
struct tm *sys_gmtime_r(time_t *epochs, struct tm *ptm);
time_t sys_mktime( struct tm *ptm);

#define localtime_r sys_localtime_r
#define HAVE_LOCALTIME_R 1
#define gmtime_r sys_gmtime_r
#define HAVE_GMTIME_R
#define mktime sys_mktime

typedef struct {
    erts_time_t tv_sec;
    erts_time_t tv_usec;
} SysTimeval;

typedef struct {
    clock_t tms_utime;
    clock_t tms_stime;
    clock_t tms_cutime;
    clock_t tms_cstime;
} SysTimes;

#define HAVE_INT64 1
#if defined (__GNUC__)
typedef unsigned long long Uint64;
typedef long long          Sint64;

typedef long long SysHrTime;
#else
typedef ULONGLONG Uint64;
typedef LONGLONG  Sint64;

typedef LONGLONG SysHrTime;
#endif

extern int sys_init_time(void);
extern void sys_gettimeofday(SysTimeval *tv);
extern SysHrTime sys_gethrtime(void);
extern clock_t sys_times(SysTimes *buffer);

extern char *win_build_environment(char *);

typedef struct {
    WCHAR *environment_strings;
    WCHAR *next_string;
} GETENV_STATE;

void erts_sys_env_init(void);

/*
 ** These are to avoid irritating warnings
 */
#pragma warning(disable : 4244)
#pragma warning(disable : 4018)

/*
 * Floating point support.
 */

extern volatile int erl_fp_exception;

#include <float.h>
/* I suspect this test isn't right, it might depend on the version of GCC
   rather than if it's a MINGW gcc, but I havent been able to pinpoint the
   exact point where _finite was added to the headers in cygwin... */
#if defined (__GNUC__) && !defined(__MINGW32__)
int _finite(double x);
#endif

/*#define NO_FPE_SIGNALS*/
#define erts_get_current_fp_exception() NULL
#define __ERTS_FP_CHECK_INIT(fpexnp) do {} while (0)
#define __ERTS_FP_ERROR(fpexnp, f, Action) if (!_finite(f)) { Action; } else {}
#define __ERTS_FP_ERROR_THOROUGH(fpexnp, f, Action) __ERTS_FP_ERROR(fpexnp, f, Action)
#define __ERTS_SAVE_FP_EXCEPTION(fpexnp)
#define __ERTS_RESTORE_FP_EXCEPTION(fpexnp)

#define ERTS_FP_CHECK_INIT(p)		__ERTS_FP_CHECK_INIT(&(p)->fp_exception)
#define ERTS_FP_ERROR(p, f, A)		__ERTS_FP_ERROR(&(p)->fp_exception, f, A)
#define ERTS_SAVE_FP_EXCEPTION(p)	__ERTS_SAVE_FP_EXCEPTION(&(p)->fp_exception)
#define ERTS_RESTORE_FP_EXCEPTION(p)	__ERTS_RESTORE_FP_EXCEPTION(&(p)->fp_exception)
#define ERTS_FP_ERROR_THOROUGH(p, f, A)	__ERTS_FP_ERROR_THOROUGH(&(p)->fp_exception, f, A)

#define erts_sys_block_fpe() 0
#define erts_sys_unblock_fpe(x) do{}while(0)

/*
 * Seems to be missing.
 */
#ifndef __GNUC__
typedef long ssize_t;
#endif

/* Threads */
#ifdef USE_THREADS
int init_async(int);
int exit_async(void);
#endif
#endif