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/* Utility and Unix shadow routines for GNU Emacs on the Microsoft W32 API.
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   Copyright (C) 1994, 1995, 2000, 2001, 2002, 2003, 2004,
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                 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
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This file is part of GNU Emacs.

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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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GNU Emacs 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 General Public License for more details.

You should have received a copy of the GNU General Public License
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along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
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/*
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   Geoff Voelker (voelker@cs.washington.edu)                         7-29-94
*/
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#include <stddef.h> /* for offsetof */
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#include <stdlib.h>
#include <stdio.h>
#include <io.h>
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#include <errno.h>
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#include <fcntl.h>
#include <ctype.h>
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#include <signal.h>
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#include <sys/file.h>
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#include <sys/time.h>
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#include <sys/utime.h>
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#include <mbstring.h>	/* for _mbspbrk */
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/* must include CRT headers *before* config.h */
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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

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#undef access
#undef chdir
#undef chmod
#undef creat
#undef ctime
#undef fopen
#undef link
#undef mkdir
#undef mktemp
#undef open
#undef rename
#undef rmdir
#undef unlink

#undef close
#undef dup
#undef dup2
#undef pipe
#undef read
#undef write
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#undef strerror

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#include "lisp.h"

#include <pwd.h>
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#include <grp.h>
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#ifdef __GNUC__
#define _ANONYMOUS_UNION
#define _ANONYMOUS_STRUCT
#endif
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#include <windows.h>
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#include <lmcons.h>
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#include <shlobj.h>
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#ifdef HAVE_SOCKETS	/* TCP connection support, if kernel can do it */
#include <sys/socket.h>
#undef socket
#undef bind
#undef connect
#undef htons
#undef ntohs
#undef inet_addr
#undef gethostname
#undef gethostbyname
#undef getservbyname
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#undef getpeername
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#undef shutdown
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#undef setsockopt
#undef listen
#undef getsockname
#undef accept
#undef recvfrom
#undef sendto
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#endif
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#include "w32.h"
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#include "ndir.h"
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#include "w32heap.h"
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#include "systime.h"

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typedef HRESULT (WINAPI * ShGetFolderPath_fn)
  (IN HWND, IN int, IN HANDLE, IN DWORD, OUT char *);

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void globals_of_w32 ();
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static DWORD get_rid (PSID);
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extern Lisp_Object Vw32_downcase_file_names;
extern Lisp_Object Vw32_generate_fake_inodes;
extern Lisp_Object Vw32_get_true_file_attributes;
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/* Defined in process.c for its own purpose.  */
extern Lisp_Object Qlocal;

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extern int w32_num_mouse_buttons;
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/* Initialization states.

   WARNING: If you add any more such variables for additional APIs,
            you MUST add initialization for them to globals_of_w32
            below.  This is because these variables might get set
            to non-NULL values during dumping, but the dumped Emacs
            cannot reuse those values, because it could be run on a
            different version of the OS, where API addresses are
            different.  */
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static BOOL g_b_init_is_windows_9x;
static BOOL g_b_init_open_process_token;
static BOOL g_b_init_get_token_information;
static BOOL g_b_init_lookup_account_sid;
static BOOL g_b_init_get_sid_identifier_authority;
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static BOOL g_b_init_get_sid_sub_authority;
static BOOL g_b_init_get_sid_sub_authority_count;
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static BOOL g_b_init_get_file_security;
static BOOL g_b_init_get_security_descriptor_owner;
static BOOL g_b_init_get_security_descriptor_group;
static BOOL g_b_init_is_valid_sid;
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/*
  BEGIN: Wrapper functions around OpenProcessToken
  and other functions in advapi32.dll that are only
  supported in Windows NT / 2k / XP
*/
  /* ** Function pointer typedefs ** */
typedef BOOL (WINAPI * OpenProcessToken_Proc) (
    HANDLE ProcessHandle,
    DWORD DesiredAccess,
    PHANDLE TokenHandle);
typedef BOOL (WINAPI * GetTokenInformation_Proc) (
    HANDLE TokenHandle,
    TOKEN_INFORMATION_CLASS TokenInformationClass,
    LPVOID TokenInformation,
    DWORD TokenInformationLength,
    PDWORD ReturnLength);
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typedef BOOL (WINAPI * GetProcessTimes_Proc) (
    HANDLE process_handle,
    LPFILETIME creation_time,
    LPFILETIME exit_time,
    LPFILETIME kernel_time,
    LPFILETIME user_time);

GetProcessTimes_Proc get_process_times_fn = NULL;

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#ifdef _UNICODE
const char * const LookupAccountSid_Name = "LookupAccountSidW";
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const char * const GetFileSecurity_Name =  "GetFileSecurityW";
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#else
const char * const LookupAccountSid_Name = "LookupAccountSidA";
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const char * const GetFileSecurity_Name =  "GetFileSecurityA";
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#endif
typedef BOOL (WINAPI * LookupAccountSid_Proc) (
    LPCTSTR lpSystemName,
    PSID Sid,
    LPTSTR Name,
    LPDWORD cbName,
    LPTSTR DomainName,
    LPDWORD cbDomainName,
    PSID_NAME_USE peUse);
typedef PSID_IDENTIFIER_AUTHORITY (WINAPI * GetSidIdentifierAuthority_Proc) (
    PSID pSid);
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typedef PDWORD (WINAPI * GetSidSubAuthority_Proc) (
    PSID pSid,
    DWORD n);
typedef PUCHAR (WINAPI * GetSidSubAuthorityCount_Proc) (
    PSID pSid);
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typedef BOOL (WINAPI * GetFileSecurity_Proc) (
    LPCTSTR lpFileName,
    SECURITY_INFORMATION RequestedInformation,
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    DWORD nLength,
    LPDWORD lpnLengthNeeded);
typedef BOOL (WINAPI * GetSecurityDescriptorOwner_Proc) (
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    PSID *pOwner,
    LPBOOL lpbOwnerDefaulted);
typedef BOOL (WINAPI * GetSecurityDescriptorGroup_Proc) (
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    PSID *pGroup,
    LPBOOL lpbGroupDefaulted);
typedef BOOL (WINAPI * IsValidSid_Proc) (
    PSID sid);
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  /* ** A utility function ** */
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static BOOL
is_windows_9x ()
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{
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  static BOOL s_b_ret=0;
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  OSVERSIONINFO os_ver;
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  if (g_b_init_is_windows_9x == 0)
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    {
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      g_b_init_is_windows_9x = 1;
      ZeroMemory(&os_ver, sizeof(OSVERSIONINFO));
      os_ver.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
      if (GetVersionEx (&os_ver))
        {
          s_b_ret = (os_ver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS);
        }
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    }
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  return s_b_ret;
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}

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/* Get total user and system times for get-internal-run-time.
   Returns a list of three integers if the times are provided by the OS
   (NT derivatives), otherwise it returns the result of current-time. */
Lisp_Object
w32_get_internal_run_time ()
{
  if (get_process_times_fn)
    {
      FILETIME create, exit, kernel, user;
      HANDLE proc = GetCurrentProcess();
      if ((*get_process_times_fn) (proc, &create, &exit, &kernel, &user))
        {
          LARGE_INTEGER user_int, kernel_int, total;
          int microseconds;
          user_int.LowPart = user.dwLowDateTime;
          user_int.HighPart = user.dwHighDateTime;
          kernel_int.LowPart = kernel.dwLowDateTime;
          kernel_int.HighPart = kernel.dwHighDateTime;
          total.QuadPart = user_int.QuadPart + kernel_int.QuadPart;
          /* FILETIME is 100 nanosecond increments, Emacs only wants
             microsecond resolution.  */
          total.QuadPart /= 10;
          microseconds = total.QuadPart % 1000000;
          total.QuadPart /= 1000000;

          /* Sanity check to make sure we can represent the result.  */
          if (total.HighPart == 0)
            {
              int secs = total.LowPart;

              return list3 (make_number ((secs >> 16) & 0xffff),
                            make_number (secs & 0xffff),
                            make_number (microseconds));
            }
        }
    }

  return Fcurrent_time ();
}

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  /* ** The wrapper functions ** */

BOOL WINAPI open_process_token (
    HANDLE ProcessHandle,
    DWORD DesiredAccess,
    PHANDLE TokenHandle)
{
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  static OpenProcessToken_Proc s_pfn_Open_Process_Token = NULL;
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  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
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  if (g_b_init_open_process_token == 0)
    {
      g_b_init_open_process_token = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Open_Process_Token =
        (OpenProcessToken_Proc) GetProcAddress (hm_advapi32, "OpenProcessToken");
    }
  if (s_pfn_Open_Process_Token == NULL)
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    {
      return FALSE;
    }
  return (
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      s_pfn_Open_Process_Token (
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          ProcessHandle,
          DesiredAccess,
          TokenHandle)
      );
}

BOOL WINAPI get_token_information (
    HANDLE TokenHandle,
    TOKEN_INFORMATION_CLASS TokenInformationClass,
    LPVOID TokenInformation,
    DWORD TokenInformationLength,
    PDWORD ReturnLength)
{
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  static GetTokenInformation_Proc s_pfn_Get_Token_Information = NULL;
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  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
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  if (g_b_init_get_token_information == 0)
    {
      g_b_init_get_token_information = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Token_Information =
        (GetTokenInformation_Proc) GetProcAddress (hm_advapi32, "GetTokenInformation");
    }
  if (s_pfn_Get_Token_Information == NULL)
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    {
      return FALSE;
    }
  return (
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      s_pfn_Get_Token_Information (
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          TokenHandle,
          TokenInformationClass,
          TokenInformation,
          TokenInformationLength,
          ReturnLength)
      );
}

BOOL WINAPI lookup_account_sid (
    LPCTSTR lpSystemName,
    PSID Sid,
    LPTSTR Name,
    LPDWORD cbName,
    LPTSTR DomainName,
    LPDWORD cbDomainName,
    PSID_NAME_USE peUse)
{
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  static LookupAccountSid_Proc s_pfn_Lookup_Account_Sid = NULL;
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  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
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  if (g_b_init_lookup_account_sid == 0)
    {
      g_b_init_lookup_account_sid = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Lookup_Account_Sid =
        (LookupAccountSid_Proc) GetProcAddress (hm_advapi32, LookupAccountSid_Name);
    }
  if (s_pfn_Lookup_Account_Sid == NULL)
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    {
      return FALSE;
    }
  return (
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      s_pfn_Lookup_Account_Sid (
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          lpSystemName,
          Sid,
          Name,
          cbName,
          DomainName,
          cbDomainName,
          peUse)
      );
}

PSID_IDENTIFIER_AUTHORITY WINAPI get_sid_identifier_authority (
    PSID pSid)
{
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  static GetSidIdentifierAuthority_Proc s_pfn_Get_Sid_Identifier_Authority = NULL;
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  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return NULL;
    }
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  if (g_b_init_get_sid_identifier_authority == 0)
    {
      g_b_init_get_sid_identifier_authority = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Sid_Identifier_Authority =
        (GetSidIdentifierAuthority_Proc) GetProcAddress (
            hm_advapi32, "GetSidIdentifierAuthority");
    }
  if (s_pfn_Get_Sid_Identifier_Authority == NULL)
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    {
      return NULL;
    }
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  return (s_pfn_Get_Sid_Identifier_Authority (pSid));
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}

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PDWORD WINAPI get_sid_sub_authority (
    PSID pSid,
    DWORD n)
{
  static GetSidSubAuthority_Proc s_pfn_Get_Sid_Sub_Authority = NULL;
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  static DWORD zero = 0U;
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  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
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      return &zero;
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    }
  if (g_b_init_get_sid_sub_authority == 0)
    {
      g_b_init_get_sid_sub_authority = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Sid_Sub_Authority =
        (GetSidSubAuthority_Proc) GetProcAddress (
            hm_advapi32, "GetSidSubAuthority");
    }
  if (s_pfn_Get_Sid_Sub_Authority == NULL)
    {
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      return &zero;
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    }
  return (s_pfn_Get_Sid_Sub_Authority (pSid, n));
}

PUCHAR WINAPI get_sid_sub_authority_count (
    PSID pSid)
{
  static GetSidSubAuthorityCount_Proc s_pfn_Get_Sid_Sub_Authority_Count = NULL;
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  static UCHAR zero = 0U;
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  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
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      return &zero;
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    }
  if (g_b_init_get_sid_sub_authority_count == 0)
    {
      g_b_init_get_sid_sub_authority_count = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Sid_Sub_Authority_Count =
        (GetSidSubAuthorityCount_Proc) GetProcAddress (
            hm_advapi32, "GetSidSubAuthorityCount");
    }
  if (s_pfn_Get_Sid_Sub_Authority_Count == NULL)
    {
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      return &zero;
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    }
  return (s_pfn_Get_Sid_Sub_Authority_Count (pSid));
}

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BOOL WINAPI get_file_security (
    LPCTSTR lpFileName,
    SECURITY_INFORMATION RequestedInformation,
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    DWORD nLength,
    LPDWORD lpnLengthNeeded)
{
  static GetFileSecurity_Proc s_pfn_Get_File_Security = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
  if (g_b_init_get_file_security == 0)
    {
      g_b_init_get_file_security = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_File_Security =
        (GetFileSecurity_Proc) GetProcAddress (
            hm_advapi32, GetFileSecurity_Name);
    }
  if (s_pfn_Get_File_Security == NULL)
    {
      return FALSE;
    }
  return (s_pfn_Get_File_Security (lpFileName, RequestedInformation,
				   pSecurityDescriptor, nLength,
				   lpnLengthNeeded));
}

BOOL WINAPI get_security_descriptor_owner (
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    PSID *pOwner,
    LPBOOL lpbOwnerDefaulted)
{
  static GetSecurityDescriptorOwner_Proc s_pfn_Get_Security_Descriptor_Owner = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
  if (g_b_init_get_security_descriptor_owner == 0)
    {
      g_b_init_get_security_descriptor_owner = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Security_Descriptor_Owner =
        (GetSecurityDescriptorOwner_Proc) GetProcAddress (
            hm_advapi32, "GetSecurityDescriptorOwner");
    }
  if (s_pfn_Get_Security_Descriptor_Owner == NULL)
    {
      return FALSE;
    }
  return (s_pfn_Get_Security_Descriptor_Owner (pSecurityDescriptor, pOwner,
					       lpbOwnerDefaulted));
}

BOOL WINAPI get_security_descriptor_group (
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    PSID *pGroup,
    LPBOOL lpbGroupDefaulted)
{
  static GetSecurityDescriptorGroup_Proc s_pfn_Get_Security_Descriptor_Group = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
  if (g_b_init_get_security_descriptor_group == 0)
    {
      g_b_init_get_security_descriptor_group = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Security_Descriptor_Group =
        (GetSecurityDescriptorGroup_Proc) GetProcAddress (
            hm_advapi32, "GetSecurityDescriptorGroup");
    }
  if (s_pfn_Get_Security_Descriptor_Group == NULL)
    {
      return FALSE;
    }
  return (s_pfn_Get_Security_Descriptor_Group (pSecurityDescriptor, pGroup,
					       lpbGroupDefaulted));
}

BOOL WINAPI is_valid_sid (
    PSID sid)
{
  static IsValidSid_Proc s_pfn_Is_Valid_Sid = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
  if (g_b_init_is_valid_sid == 0)
    {
      g_b_init_is_valid_sid = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Is_Valid_Sid =
        (IsValidSid_Proc) GetProcAddress (
            hm_advapi32, "IsValidSid");
    }
  if (s_pfn_Is_Valid_Sid == NULL)
    {
      return FALSE;
    }
  return (s_pfn_Is_Valid_Sid (sid));
}

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/*
  END: Wrapper functions around OpenProcessToken
  and other functions in advapi32.dll that are only
  supported in Windows NT / 2k / XP
*/

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/* Equivalent of strerror for W32 error codes.  */
char *
w32_strerror (int error_no)
{
  static char buf[500];

  if (error_no == 0)
    error_no = GetLastError ();

  buf[0] = '\0';
  if (!FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM, NULL,
		      error_no,
		      0, /* choose most suitable language */
		      buf, sizeof (buf), NULL))
    sprintf (buf, "w32 error %u", error_no);
  return buf;
}

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/* Return 1 if P is a valid pointer to an object of size SIZE.  Return
   0 if P is NOT a valid pointer.  Return -1 if we cannot validate P.

   This is called from alloc.c:valid_pointer_p.  */
int
w32_valid_pointer_p (void *p, int size)
{
  SIZE_T done;
  HANDLE h = OpenProcess (PROCESS_VM_READ, FALSE, GetCurrentProcessId ());

  if (h)
    {
      unsigned char *buf = alloca (size);
      int retval = ReadProcessMemory (h, p, buf, size, &done);

      CloseHandle (h);
      return retval;
    }
  else
    return -1;
}

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static char startup_dir[MAXPATHLEN];
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/* Get the current working directory.  */
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char *
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getwd (char *dir)
{
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#if 0
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  if (GetCurrentDirectory (MAXPATHLEN, dir) > 0)
    return dir;
  return NULL;
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#else
  /* Emacs doesn't actually change directory itself, and we want to
     force our real wd to be where emacs.exe is to avoid unnecessary
     conflicts when trying to rename or delete directories.  */
  strcpy (dir, startup_dir);
  return dir;
#endif
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}

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#ifndef HAVE_SOCKETS
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/* Emulate gethostname.  */
int
gethostname (char *buffer, int size)
{
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  /* NT only allows small host names, so the buffer is
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     certainly large enough.  */
  return !GetComputerName (buffer, &size);
}
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#endif /* HAVE_SOCKETS */
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/* Emulate getloadavg.  */
int
getloadavg (double loadavg[], int nelem)
{
  int i;

  /* A faithful emulation is going to have to be saved for a rainy day.  */
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  for (i = 0; i < nelem; i++)
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    {
      loadavg[i] = 0.0;
    }
  return i;
}

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/* Emulate getpwuid, getpwnam and others.  */
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#define PASSWD_FIELD_SIZE 256

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static char dflt_passwd_name[PASSWD_FIELD_SIZE];
static char dflt_passwd_passwd[PASSWD_FIELD_SIZE];
static char dflt_passwd_gecos[PASSWD_FIELD_SIZE];
static char dflt_passwd_dir[PASSWD_FIELD_SIZE];
static char dflt_passwd_shell[PASSWD_FIELD_SIZE];
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static struct passwd dflt_passwd =
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{
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  dflt_passwd_name,
  dflt_passwd_passwd,
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  0,
  0,
  0,
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  dflt_passwd_gecos,
  dflt_passwd_dir,
  dflt_passwd_shell,
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};

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static char dflt_group_name[GNLEN+1];

static struct group dflt_group =
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{
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  /* When group information is not available, we return this as the
     group for all files.  */
  dflt_group_name,
  0,
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};

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int
getuid ()
{
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  return dflt_passwd.pw_uid;
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}

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int
geteuid ()
{
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  /* I could imagine arguing for checking to see whether the user is
     in the Administrators group and returning a UID of 0 for that
     case, but I don't know how wise that would be in the long run.  */
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  return getuid ();
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}

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int
getgid ()
{
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  return dflt_passwd.pw_gid;
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}

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int
getegid ()
{
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  return getgid ();
}

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struct passwd *
getpwuid (int uid)
{
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  if (uid == dflt_passwd.pw_uid)
    return &dflt_passwd;
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  return NULL;
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}

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struct group *
getgrgid (gid_t gid)
{
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  return &dflt_group;
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}

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struct passwd *
getpwnam (char *name)
{
  struct passwd *pw;
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  pw = getpwuid (getuid ());
  if (!pw)
    return pw;

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  if (stricmp (name, pw->pw_name))
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    return NULL;

  return pw;
}

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void
init_user_info ()
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{
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  /* Find the user's real name by opening the process token and
     looking up the name associated with the user-sid in that token.

     Use the relative portion of the identifier authority value from
     the user-sid as the user id value (same for group id using the
     primary group sid from the process token). */

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  char         uname[UNLEN+1], gname[GNLEN+1], domain[1025];
  DWORD        ulength = sizeof (uname), dlength = sizeof (domain), trash;
  DWORD	       glength = sizeof (gname);
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  HANDLE       token = NULL;
  SID_NAME_USE user_type;
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  unsigned char buf[1024];
  TOKEN_USER   user_token;
  TOKEN_PRIMARY_GROUP group_token;
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  if (open_process_token (GetCurrentProcess (), TOKEN_QUERY, &token)
      && get_token_information (token, TokenUser,
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				(PVOID)buf, sizeof (buf), &trash)
      && (memcpy (&user_token, buf, sizeof (user_token)),
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	  lookup_account_sid (NULL, user_token.User.Sid, uname, &ulength,
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			      domain, &dlength, &user_type)))
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    {
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      strcpy (dflt_passwd.pw_name, uname);
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      /* Determine a reasonable uid value.  */
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      if (stricmp ("administrator", uname) == 0)
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	{
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	  dflt_passwd.pw_uid = 500; /* well-known Administrator uid */
	  dflt_passwd.pw_gid = 513; /* well-known None gid */
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	}
      else
	{
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	  /* Use the last sub-authority value of the RID, the relative
	     portion of the SID, as user/group ID. */
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	  dflt_passwd.pw_uid = get_rid (user_token.User.Sid);
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	  /* Get group id and name.  */
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	  if (get_token_information (token, TokenPrimaryGroup,
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				     (PVOID)buf, sizeof (buf), &trash))
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	    {
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	      memcpy (&group_token, buf, sizeof (group_token));
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	      dflt_passwd.pw_gid = get_rid (group_token.PrimaryGroup);
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	      dlength = sizeof (domain);
	      if (lookup_account_sid (NULL, group_token.PrimaryGroup,
				      gname, &glength, NULL, &dlength,
				      &user_type))
		strcpy (dflt_group_name, gname);
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	    }
	  else
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	    dflt_passwd.pw_gid = dflt_passwd.pw_uid;
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	}
    }
  /* If security calls are not supported (presumably because we
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     are running under Windows 95), fallback to this. */
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  else if (GetUserName (uname, &ulength))
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    {
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      strcpy (dflt_passwd.pw_name, uname);
      if (stricmp ("administrator", uname) == 0)
	dflt_passwd.pw_uid = 0;
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      else
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	dflt_passwd.pw_uid = 123;
      dflt_passwd.pw_gid = dflt_passwd.pw_uid;
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    }
  else
    {
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      strcpy (dflt_passwd.pw_name, "unknown");
      dflt_passwd.pw_uid = 123;
      dflt_passwd.pw_gid = 123;
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    }
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  dflt_group.gr_gid = dflt_passwd.pw_gid;
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  /* Ensure HOME and SHELL are defined. */
  if (getenv ("HOME") == NULL)
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    abort ();
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  if (getenv ("SHELL") == NULL)
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    abort ();
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  /* Set dir and shell from environment variables. */
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  strcpy (dflt_passwd.pw_dir, getenv ("HOME"));
  strcpy (dflt_passwd.pw_shell, getenv ("SHELL"));
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  if (token)
    CloseHandle (token);
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}

int
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random ()
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{
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  /* rand () on NT gives us 15 random bits...hack together 30 bits.  */
  return ((rand () << 15) | rand ());
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}

void
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srandom (int seed)
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{
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  srand (seed);
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}

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/* Normalize filename by converting all path separators to
   the specified separator.  Also conditionally convert upper
   case path name components to lower case.  */

static void
normalize_filename (fp, path_sep)
     register char *fp;
     char path_sep;
{
  char sep;
  char *elem;

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  /* Always lower-case drive letters a-z, even if the filesystem
     preserves case in filenames.
     This is so filenames can be compared by string comparison
     functions that are case-sensitive.  Even case-preserving filesystems
     do not distinguish case in drive letters.  */
  if (fp[1] == ':' && *fp >= 'A' && *fp <= 'Z')
    {
      *fp += 'a' - 'A';
      fp += 2;
    }

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  if (NILP (Vw32_downcase_file_names))
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    {
      while (*fp)
	{
	  if (*fp == '/' || *fp == '\\')
	    *fp = path_sep;
	  fp++;
	}
      return;
    }

  sep = path_sep;		/* convert to this path separator */
  elem = fp;			/* start of current path element */

  do {
    if (*fp >= 'a' && *fp <= 'z')
      elem = 0;			/* don't convert this element */

    if (*fp == 0 || *fp == ':')
      {
	sep = *fp;		/* restore current separator (or 0) */
	*fp = '/';		/* after conversion of this element */
      }

    if (*fp == '/' || *fp == '\\')
      {
	if (elem && elem != fp)
	  {
	    *fp = 0;		/* temporary end of string */
	    _strlwr (elem);	/* while we convert to lower case */
	  }
	*fp = sep;		/* convert (or restore) path separator */
	elem = fp + 1;		/* next element starts after separator */
	sep = path_sep;
      }
  } while (*fp++);
}

892
/* Destructively turn backslashes into slashes.  */
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void
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dostounix_filename (p)
     register char *p;
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{
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  normalize_filename (p, '/');
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}

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/* Destructively turn slashes into backslashes.  */
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void
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unixtodos_filename (p)
     register char *p;
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{
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  normalize_filename (p, '\\');
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}

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/* Remove all CR's that are followed by a LF.
   (From msdos.c...probably should figure out a way to share it,
   although this code isn't going to ever change.)  */
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int
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crlf_to_lf (n, buf)
     register int n;
     register unsigned char *buf;
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{
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  unsigned char *np = buf;
  unsigned char *startp = buf;
  unsigned char *endp = buf + n;
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  if (n == 0)
    return n;
  while (buf < endp - 1)
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    {
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      if (*buf == 0x0d)
	{
	  if (*(++buf) != 0x0a)
	    *np++ = 0x0d;
	}
      else
	*np++ = *buf++;
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    }
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  if (buf < endp)
    *np++ = *buf++;
  return np - startp;
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}

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/* Parse the root part of file name, if present.  Return length and
    optionally store pointer to char after root.  */
static int
parse_root (char * name, char ** pPath)
{
  char * start = name;

  if (name == NULL)
    return 0;

  /* find the root name of the volume if given */
  if (isalpha (name[0]) && name[1] == ':')
    {
      /* skip past drive specifier */
      name += 2;
      if (IS_DIRECTORY_SEP (name[0]))
	name++;
    }
  else if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
    {
      int slashes = 2;
      name += 2;
      do
        {
	  if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
	    break;
	  name++;
	}
      while ( *name );
      if (IS_DIRECTORY_SEP (name[0]))
	name++;
    }

  if (pPath)
    *pPath = name;

  return name - start;
}

/* Get long base name for name; name is assumed to be absolute.  */
static int
get_long_basename (char * name, char * buf, int size)
{
  WIN32_FIND_DATA find_data;
  HANDLE dir_handle;
  int len = 0;

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  /* must be valid filename, no wild cards or other invalid characters */
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  if (_mbspbrk (name, "*?|<>\""))
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    return 0;

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  dir_handle = FindFirstFile (name, &find_data);
  if (dir_handle != INVALID_HANDLE_VALUE)
    {
      if ((len = strlen (find_data.cFileName)) < size)
	memcpy (buf, find_data.cFileName, len + 1);
      else
	len = 0;
      FindClose (dir_handle);
    }
  return len;
}

/* Get long name for file, if possible (assumed to be absolute).  */
BOOL
w32_get_long_filename (char * name, char * buf, int size)
{
  char * o = buf;
  char * p;
  char * q;
  char full[ MAX_PATH ];
  int len;

  len = strlen (name);
  if (len >= MAX_PATH)
    return FALSE;

  /* Use local copy for destructive modification.  */
  memcpy (full, name, len+1);
  unixtodos_filename (full);

  /* Copy root part verbatim.  */
  len = parse_root (full, &p);
  memcpy (o, full, len);
  o += len;
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  *o = '\0';
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  size -= len;

1025
  while (p != NULL && *p)
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    {
      q = p;
      p = strchr (q, '\\');
      if (p) *p = '\0';
      len = get_long_basename (full, o, size);
      if (len > 0)
	{
	  o += len;
	  size -= len;
	  if (p != NULL)
	    {
	      *p++ = '\\';
	      if (size < 2)
		return FALSE;
	      *o++ = '\\';
	      size--;
	      *o = '\0';
	    }
	}
      else
	return FALSE;
    }

  return TRUE;
}

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int
is_unc_volume (const char *filename)
{
  const char *ptr = filename;

  if (!IS_DIRECTORY_SEP (ptr[0]) || !IS_DIRECTORY_SEP (ptr[1]) || !ptr[2])
    return 0;

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  if (_mbspbrk (ptr + 2, "*?|<>\"\\/"))
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    return 0;

  return 1;
}
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/* Routines that are no-ops on NT but are defined to get Emacs to compile.  */

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int
sigsetmask (int signal_mask)
{
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  return 0;
}

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int
sigmask (int sig)
{
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  return 0;
}

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int
sigblock (int sig)
{
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  return 0;
}

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int
sigunblock (int sig)
{
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  return 0;
}

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int
setpgrp (int pid, int gid)
{
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  return 0;
}

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int
alarm (int seconds)
{
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  return 0;
}

1104
#define REG_ROOT "SOFTWARE\\GNU\\Emacs"
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LPBYTE
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w32_get_resource (key, lpdwtype)
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    char *key;
    LPDWORD lpdwtype;
{
  LPBYTE lpvalue;
  HKEY hrootkey = NULL;
  DWORD cbData;
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  /* Check both the current user and the local machine to see if
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     we have any resources.  */
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  if (RegOpenKeyEx (HKEY_CURRENT_USER, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
    {
      lpvalue = NULL;

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      if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS
	  && (lpvalue = (LPBYTE) xmalloc (cbData)) != NULL
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	  && RegQueryValueEx (hrootkey, key, NULL, lpdwtype, lpvalue, &cbData) == ERROR_SUCCESS)
	{
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          RegCloseKey (hrootkey);
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	  return (lpvalue);
	}

      if (lpvalue) xfree (lpvalue);
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1132
      RegCloseKey (hrootkey);
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    }

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  if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
    {
      lpvalue = NULL;
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      if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS
	  && (lpvalue = (LPBYTE) xmalloc (cbData)) != NULL
	  && RegQueryValueEx (hrootkey, key, NULL, lpdwtype, lpvalue, &cbData) == ERROR_SUCCESS)
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	{
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          RegCloseKey (hrootkey);
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	  return (lpvalue);
	}
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      if (lpvalue) xfree (lpvalue);
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1149
      RegCloseKey (hrootkey);
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    }

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  return (NULL);
}

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char *get_emacs_configuration (void);
extern Lisp_Object Vsystem_configuration;

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void
1159
init_environment (char ** argv)
1160
{
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  static const char * const tempdirs[] = {
    "$TMPDIR", "$TEMP", "$TMP", "c:/"
  };
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  int i;
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