/*
 * Helper functions for ntdll
 *
 * Copyright 2000 Juergen Schmied
 * Copyright 2010 Marcus Meissner
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "config.h"

#include <time.h>
#include <math.h>
#ifdef HAVE_SYS_UTSNAME_H
#include <sys/utsname.h>
#endif

#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "wine/library.h"
#include "wine/debug.h"
#include "ntdll_misc.h"
#include "wmistr.h"
#include "evntrace.h"

WINE_DEFAULT_DEBUG_CHANNEL(ntdll);

LPCSTR debugstr_ObjectAttributes(const OBJECT_ATTRIBUTES *oa)
{
    if (!oa) return "<null>";
    return wine_dbg_sprintf( "{name=%s, attr=0x%08x, hRoot=%p, sd=%p}\n",
                             debugstr_us(oa->ObjectName), oa->Attributes,
                             oa->RootDirectory, oa->SecurityDescriptor );
}

LPCSTR debugstr_us( const UNICODE_STRING *us )
{
    if (!us) return "<null>";
    return debugstr_wn(us->Buffer, us->Length / sizeof(WCHAR));
}

/*********************************************************************
 *                  wine_get_version   (NTDLL.@)
 */
const char * CDECL NTDLL_wine_get_version(void)
{
    return wine_get_version();
}

/*********************************************************************
 *                  wine_get_build_id   (NTDLL.@)
 */
const char * CDECL NTDLL_wine_get_build_id(void)
{
    return wine_get_build_id();
}

/*********************************************************************
 *                  wine_get_host_version   (NTDLL.@)
 */
void CDECL NTDLL_wine_get_host_version( const char **sysname, const char **release )
{
#ifdef HAVE_SYS_UTSNAME_H
    static struct utsname buf;
    static BOOL init_done;

    if (!init_done)
    {
        uname( &buf );
        init_done = TRUE;
    }
    if (sysname) *sysname = buf.sysname;
    if (release) *release = buf.release;
#else
    if (sysname) *sysname = "";
    if (release) *release = "";
#endif
}

/*********************************************************************
 *                  abs   (NTDLL.@)
 */
int CDECL NTDLL_abs( int i )
{
    return abs( i );
}

/*********************************************************************
 *                  labs   (NTDLL.@)
 */
LONG CDECL NTDLL_labs( LONG i )
{
    return labs( i );
}

/*********************************************************************
 *                  atan   (NTDLL.@)
 */
double CDECL NTDLL_atan( double d )
{
    return atan( d );
}

/*********************************************************************
 *                  ceil   (NTDLL.@)
 */
double CDECL NTDLL_ceil( double d )
{
    return ceil( d );
}

/*********************************************************************
 *                  cos   (NTDLL.@)
 */
double CDECL NTDLL_cos( double d )
{
    return cos( d );
}

/*********************************************************************
 *                  fabs   (NTDLL.@)
 */
double CDECL NTDLL_fabs( double d )
{
    return fabs( d );
}

/*********************************************************************
 *                  floor   (NTDLL.@)
 */
double CDECL NTDLL_floor( double d )
{
    return floor( d );
}

/*********************************************************************
 *                  log   (NTDLL.@)
 */
double CDECL NTDLL_log( double d )
{
    return log( d );
}

/*********************************************************************
 *                  pow   (NTDLL.@)
 */
double CDECL NTDLL_pow( double x, double y )
{
    return pow( x, y );
}

/*********************************************************************
 *                  sin   (NTDLL.@)
 */
double CDECL NTDLL_sin( double d )
{
    return sin( d );
}

/*********************************************************************
 *                  sqrt   (NTDLL.@)
 */
double CDECL NTDLL_sqrt( double d )
{
    return sqrt( d );
}

/*********************************************************************
 *                  tan   (NTDLL.@)
 */
double CDECL NTDLL_tan( double d )
{
    return tan( d );
}

#if defined(__GNUC__) && defined(__i386__)

#define FPU_DOUBLE(var) double var; \
    __asm__ __volatile__( "fstpl %0;fwait" : "=m" (var) : )
#define FPU_DOUBLES(var1,var2) double var1,var2; \
    __asm__ __volatile__( "fstpl %0;fwait" : "=m" (var2) : ); \
    __asm__ __volatile__( "fstpl %0;fwait" : "=m" (var1) : )

/*********************************************************************
 *		_CIcos (NTDLL.@)
 */
double CDECL NTDLL__CIcos(void)
{
    FPU_DOUBLE(x);
    return NTDLL_cos(x);
}

/*********************************************************************
 *		_CIlog (NTDLL.@)
 */
double CDECL NTDLL__CIlog(void)
{
    FPU_DOUBLE(x);
    return NTDLL_log(x);
}

/*********************************************************************
 *		_CIpow (NTDLL.@)
 */
double CDECL NTDLL__CIpow(void)
{
    FPU_DOUBLES(x,y);
    return NTDLL_pow(x,y);
}

/*********************************************************************
 *		_CIsin (NTDLL.@)
 */
double CDECL NTDLL__CIsin(void)
{
    FPU_DOUBLE(x);
    return NTDLL_sin(x);
}

/*********************************************************************
 *		_CIsqrt (NTDLL.@)
 */
double CDECL NTDLL__CIsqrt(void)
{
    FPU_DOUBLE(x);
    return NTDLL_sqrt(x);
}

/*********************************************************************
 *                  _ftol   (NTDLL.@)
 */
LONGLONG CDECL NTDLL__ftol(void)
{
    FPU_DOUBLE(x);
    return (LONGLONG)x;
}

#endif /* defined(__GNUC__) && defined(__i386__) */

static void
NTDLL_mergesort( void *arr, void *barr, size_t elemsize, int(__cdecl *compar)(const void *, const void *),
                 size_t left, size_t right )
{
    if(right>left) {
        size_t i, j, k, m;
        m=left+(right-left)/2;
        NTDLL_mergesort( arr, barr, elemsize, compar, left, m);
        NTDLL_mergesort( arr, barr, elemsize, compar, m+1, right);

#define X(a,i) ((char*)a+elemsize*(i))
        for (k=left, i=left, j=m+1; i<=m && j<=right; k++) {
            if (compar(X(arr, i), X(arr,j)) <= 0) {
                memcpy(X(barr,k), X(arr, i), elemsize);
                i++;
            } else {
                memcpy(X(barr,k), X(arr, j), elemsize);
                j++;
            }
        }
        if (i<=m)
            memcpy(X(barr,k), X(arr,i), (m-i+1)*elemsize);
        else
            memcpy(X(barr,k), X(arr,j), (right-j+1)*elemsize);

        memcpy(X(arr, left), X(barr, left), (right-left+1)*elemsize);
    }
#undef X
}

/*********************************************************************
 *                  qsort   (NTDLL.@)
 */
void __cdecl NTDLL_qsort( void *base, size_t nmemb, size_t size,
                          int(__cdecl *compar)(const void *, const void *) )
{
    void *secondarr;
    if (nmemb < 2 || size == 0) return;
    secondarr = RtlAllocateHeap (GetProcessHeap(), 0, nmemb*size);
    NTDLL_mergesort( base, secondarr, size, compar, 0, nmemb-1 );
    RtlFreeHeap (GetProcessHeap(),0, secondarr);
}

/*********************************************************************
 *                  bsearch   (NTDLL.@)
 */
void * __cdecl
NTDLL_bsearch( const void *key, const void *base, size_t nmemb,
               size_t size, int (__cdecl *compar)(const void *, const void *) )
{
    ssize_t min = 0;
    ssize_t max = nmemb - 1;

    while (min <= max)
    {
        ssize_t cursor = min + (max - min) / 2;
        int ret = compar(key,(const char *)base+(cursor*size));
        if (!ret)
            return (char*)base+(cursor*size);
        if (ret < 0)
            max = cursor - 1;
        else
            min = cursor + 1;
    }
    return NULL;
}


/*********************************************************************
 *                  _lfind   (NTDLL.@)
 */
void * __cdecl _lfind( const void *key, const void *base, unsigned int *nmemb,
                       size_t size, int(__cdecl *compar)(const void *, const void *) )
{
    size_t i, n = *nmemb;

    for (i=0;i<n;i++)
        if (!compar(key,(char*)base+(size*i)))
            return (char*)base+(size*i);
    return NULL;
}

/******************************************************************************
 *                  WinSqmEndSession   (NTDLL.@)
 */
NTSTATUS WINAPI WinSqmEndSession(HANDLE session)
{
    FIXME("(%p): stub\n", session);
    return STATUS_NOT_IMPLEMENTED;
}

/*********************************************************************
 *                  WinSqmIsOptedIn   (NTDLL.@)
 */
BOOL WINAPI WinSqmIsOptedIn(void)
{
    FIXME("(): stub\n");
    return FALSE;
}

/******************************************************************************
 *                  WinSqmStartSession   (NTDLL.@)
 */
HANDLE WINAPI WinSqmStartSession(GUID *sessionguid, DWORD sessionid, DWORD unknown1)
{
    FIXME("(%p, 0x%x, 0x%x): stub\n", sessionguid, sessionid, unknown1);
    return INVALID_HANDLE_VALUE;
}

/******************************************************************************
 *                  EtwRegisterTraceGuidsW (NTDLL.@)
 *
 * Register an event trace provider and the event trace classes that it uses
 * to generate events.
 *
 * PARAMS
 *  RequestAddress     [I]   ControlCallback function
 *  RequestContext     [I]   Optional provider-defined context
 *  ControlGuid        [I]   GUID of the registering provider
 *  GuidCount          [I]   Number of elements in the TraceGuidReg array
 *  TraceGuidReg       [I/O] Array of TRACE_GUID_REGISTRATION structures
 *  MofImagePath       [I]   not supported, set to NULL
 *  MofResourceName    [I]   not supported, set to NULL
 *  RegistrationHandle [O]   Provider's registration handle
 *
 * RETURNS
 *  Success: ERROR_SUCCESS
 *  Failure: System error code
 */
ULONG WINAPI EtwRegisterTraceGuidsW( WMIDPREQUEST RequestAddress,
                void *RequestContext, const GUID *ControlGuid, ULONG GuidCount,
                TRACE_GUID_REGISTRATION *TraceGuidReg, const WCHAR *MofImagePath,
                const WCHAR *MofResourceName, TRACEHANDLE *RegistrationHandle )
{
    FIXME("(%p, %p, %s, %u, %p, %s, %s, %p): stub\n", RequestAddress, RequestContext,
          debugstr_guid(ControlGuid), GuidCount, TraceGuidReg, debugstr_w(MofImagePath),
          debugstr_w(MofResourceName), RegistrationHandle);

    if (TraceGuidReg)
    {
        ULONG i;
        for (i = 0; i < GuidCount; i++)
        {
            FIXME("  register trace class %s\n", debugstr_guid(TraceGuidReg[i].Guid));
            TraceGuidReg[i].RegHandle = (HANDLE)0xdeadbeef;
        }
    }
    *RegistrationHandle = (TRACEHANDLE)0xdeadbeef;
    return ERROR_SUCCESS;
}

/******************************************************************************
 *                  EtwRegisterTraceGuidsA (NTDLL.@)
 */
ULONG WINAPI EtwRegisterTraceGuidsA( WMIDPREQUEST RequestAddress,
                void *RequestContext, const GUID *ControlGuid, ULONG GuidCount,
                TRACE_GUID_REGISTRATION *TraceGuidReg, const char *MofImagePath,
                const char *MofResourceName, TRACEHANDLE *RegistrationHandle )
{
    FIXME("(%p, %p, %s, %u, %p, %s, %s, %p): stub\n", RequestAddress, RequestContext,
          debugstr_guid(ControlGuid), GuidCount, TraceGuidReg, debugstr_a(MofImagePath),
          debugstr_a(MofResourceName), RegistrationHandle);
    return ERROR_SUCCESS;
}