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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 Free Software Foundation, Inc.
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This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

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
along with GNU Emacs; see the file COPYING.  If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
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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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/* 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 <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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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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extern int w32_num_mouse_buttons;
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/*
	Initialization states
 */
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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/*
  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);
#ifdef _UNICODE
const char * const LookupAccountSid_Name = "LookupAccountSidW";
#else
const char * const LookupAccountSid_Name = "LookupAccountSidA";
#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);

  /* ** A utility function ** */
static BOOL is_windows_9x ()
{
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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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}

  /* ** 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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}

/*
  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

static char the_passwd_name[PASSWD_FIELD_SIZE];
static char the_passwd_passwd[PASSWD_FIELD_SIZE];
static char the_passwd_gecos[PASSWD_FIELD_SIZE];
static char the_passwd_dir[PASSWD_FIELD_SIZE];
static char the_passwd_shell[PASSWD_FIELD_SIZE];
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static struct passwd the_passwd =
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{
  the_passwd_name,
  the_passwd_passwd,
  0,
  0,
  0,
  the_passwd_gecos,
  the_passwd_dir,
  the_passwd_shell,
};

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static struct group the_group =
{
  /* There are no groups on NT, so we just return "root" as the
     group name.  */
  "root",
};

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int
getuid ()
{
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  return the_passwd.pw_uid;
}

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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 the_passwd.pw_gid;
}

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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 == the_passwd.pw_uid)
    return &the_passwd;
  return NULL;
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}

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

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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). */

  char            user_sid[256], name[256], domain[256];
  DWORD           length = sizeof (name), dlength = sizeof (domain), trash;
  HANDLE          token = NULL;
  SID_NAME_USE    user_type;

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  if (
			open_process_token (GetCurrentProcess (), TOKEN_QUERY, &token)
      && get_token_information (
					token, TokenUser,
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			      (PVOID) user_sid, sizeof (user_sid), &trash)
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      && lookup_account_sid (
					NULL, *((PSID *) user_sid), name, &length,
			   domain, &dlength, &user_type)
			)
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    {
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      strcpy (the_passwd.pw_name, name);
      /* Determine a reasonable uid value. */
      if (stricmp ("administrator", name) == 0)
	{
	  the_passwd.pw_uid = 0;
	  the_passwd.pw_gid = 0;
	}
      else
	{
	  SID_IDENTIFIER_AUTHORITY * pSIA;

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	  pSIA = get_sid_identifier_authority (*((PSID *) user_sid));
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	  /* I believe the relative portion is the last 4 bytes (of 6)
	     with msb first. */
	  the_passwd.pw_uid = ((pSIA->Value[2] << 24) +
			       (pSIA->Value[3] << 16) +
			       (pSIA->Value[4] << 8)  +
			       (pSIA->Value[5] << 0));
	  /* restrict to conventional uid range for normal users */
	  the_passwd.pw_uid = the_passwd.pw_uid % 60001;

	  /* Get group id */
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	  if (get_token_information (token, TokenPrimaryGroup,
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				   (PVOID) user_sid, sizeof (user_sid), &trash))
	    {
	      SID_IDENTIFIER_AUTHORITY * pSIA;

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	      pSIA = get_sid_identifier_authority (*((PSID *) user_sid));
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	      the_passwd.pw_gid = ((pSIA->Value[2] << 24) +
				   (pSIA->Value[3] << 16) +
				   (pSIA->Value[4] << 8)  +
				   (pSIA->Value[5] << 0));
	      /* I don't know if this is necessary, but for safety... */
	      the_passwd.pw_gid = the_passwd.pw_gid % 60001;
	    }
	  else
	    the_passwd.pw_gid = the_passwd.pw_uid;
	}
    }
  /* If security calls are not supported (presumably because we
       are running under Windows 95), fallback to this. */
  else if (GetUserName (name, &length))
    {
      strcpy (the_passwd.pw_name, name);
      if (stricmp ("administrator", name) == 0)
	the_passwd.pw_uid = 0;
      else
	the_passwd.pw_uid = 123;
      the_passwd.pw_gid = the_passwd.pw_uid;
    }
  else
    {
      strcpy (the_passwd.pw_name, "unknown");
      the_passwd.pw_uid = 123;
      the_passwd.pw_gid = 123;
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    }
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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. */
  strcpy (the_passwd.pw_dir, getenv ("HOME"));
  strcpy (the_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++);
}

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/* 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 (strpbrk (name, "*?|<>\""))
    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;

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  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;

  if (strpbrk (ptr + 2, "*?|<>\"\\/"))
    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;
}

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void
unrequest_sigio (void)
{
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  return;
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}

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void
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request_sigio (void)
{
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  return;
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}

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#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;
  BOOL ok = FALSE;
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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)
	{
	  return (lpvalue);
	}

      if (lpvalue) xfree (lpvalue);
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      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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	{
	  return (lpvalue);
	}
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      if (lpvalue) xfree (lpvalue);
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      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
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init_environment (char ** argv)
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{
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  static const char * const tempdirs[] = {
    "$TMPDIR", "$TEMP", "$TMP", "c:/"
  };
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  int i;
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  const int imax = sizeof (tempdirs) / sizeof (tempdirs[0]);

  /* Make sure they have a usable $TMPDIR.  Many Emacs functions use
     temporary files and assume "/tmp" if $TMPDIR is unset, which
     will break on DOS/Windows.  Refuse to work if we cannot find
     a directory, not even "c:/", usable for that purpose.  */
  for (i = 0; i < imax ; i++)
    {
      const char *tmp = tempdirs[i];

      if (*tmp == '$')
	tmp = getenv (tmp + 1);
      /* Note that `access' can lie to us if the directory resides on a
	 read-only filesystem, like CD-ROM or a write-protected floppy.
	 The only way to be really sure is to actually create a file and
	 see if it succeeds.  But I think that's too much to ask.  */
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      if (tmp && _access (tmp, D_OK) == 0)
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	{
	  char * var = alloca (strlen (tmp) + 8);
	  sprintf (var, "TMPDIR=%s", tmp);
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	  _putenv (strdup (var));
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	  break;
	}
    }
  if (i >= imax)
    cmd_error_internal
      (Fcons (Qerror,
	      Fcons (build_string ("no usable temporary directories found!!"),
		     Qnil)),
       "While setting TMPDIR: ");

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  /* Check for environment variables and use registry settings if they
     don't exist.  Fallback on default values where applicable.  */
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  {
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    int i;
    LPBYTE lpval;
    DWORD dwType;
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    char locale_name[32];
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    struct stat ignored;
    char default_home[MAX_PATH];
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    static const struct env_entry
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    {
      char * name;
      char * def_value;
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    } dflt_envvars[] =
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    {
      {"HOME", "C:/"},
      {"PRELOAD_WINSOCK", NULL},
      {"emacs_dir", "C:/emacs"},
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      {"EMACSLOADPATH", "%emacs_dir%/site-lisp;%emacs_dir%/../site-lisp;%emacs_dir%/lisp;%emacs_dir%/leim"},
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      {"SHELL", "%emacs_dir%/bin/cmdproxy.exe"},
      {"EMACSDATA", "%emacs_dir%/etc"},
      {"EMACSPATH", "%emacs_dir%/bin"},
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      /* We no longer set INFOPATH because Info-default-directory-list
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	 is then ignored.  */
      /*  {"INFOPATH", "%emacs_dir%/info"},  */
      {"EMACSDOC", "%emacs_dir%/etc"},
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      {"TERM", "cmd"},
      {"LANG", NULL},
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    };

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#define N_ENV_VARS sizeof(dflt_envvars)/sizeof(dflt_envvars[0])

    /* We need to copy dflt_envvars[] and work on the copy because we
       don't want the dumped Emacs to inherit the values of
       environment variables we saw during dumping (which could be on
       a different system).  The defaults above must be left intact.  */
    struct env_entry env_vars[N_ENV_VARS];

    for (i = 0; i < N_ENV_VARS; i++)
      env_vars[i] = dflt_envvars[i];

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    /* For backwards compatibility, check if a .emacs file exists in C:/
       If not, then we can try to default to the appdata directory under the
       user's profile, which is more likely to be writable.   */
    if (stat ("C:/.emacs", &ignored) < 0)
    {
      HRESULT profile_result;
      /* Dynamically load ShGetFolderPath, as it won't exist on versions
	 of Windows 95 and NT4 that have not been updated to include
	 MSIE 5.  Also we don't link with shell32.dll by default.  */
      HMODULE shell32_dll;
      ShGetFolderPath_fn get_folder_path;
      shell32_dll = GetModuleHandle ("shell32.dll");
      get_folder_path = (ShGetFolderPath_fn)
	GetProcAddress (shell32_dll, "SHGetFolderPathA");

      if (get_folder_path != NULL)
	{
	  profile_result = get_folder_path (NULL, CSIDL_APPDATA, NULL,
					    0, default_home);

	  /* If we can't get the appdata dir, revert to old behaviour.  */
	  if (profile_result == S_OK)
	    env_vars[0].def_value = default_home;
	}

      /* Unload shell32.dll, it is not needed anymore.  */
      FreeLibrary (shell32_dll);
    }

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  /* Get default locale info and use it for LANG.  */
  if (GetLocaleInfo (LOCALE_USER_DEFAULT,
                     LOCALE_SABBREVLANGNAME | LOCALE_USE_CP_ACP,
                     locale_name, sizeof (locale_name)))
    {
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      for (i = 0; i < N_ENV_VARS; i++)
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        {
          if (strcmp (env_vars[i].name, "LANG") == 0)
            {
              env_vars[i].def_value = locale_name;
              break;
            }
        }
    }

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#define SET_ENV_BUF_SIZE (4 * MAX_PATH)	/* to cover EMACSLOADPATH */

    /* Treat emacs_dir specially: set it unconditionally based on our
       location, if it appears that we are running from the bin subdir
       of a standard installation.  */
    {
      char *p;
      char modname[MAX_PATH];

      if (!GetModuleFileName (NULL, modname, MAX_PATH))
	abort ();
      if ((p = strrchr (modname, '\\')) == NULL)
	abort ();
      *p = 0;

      if ((p = strrchr (modname, '\\')) && stricmp (p, "\\bin") == 0)
	{
	  char buf[SET_ENV_BUF_SIZE];

	  *p = 0;
	  for (p = modname; *p; p++)
	    if (*p == '\\') *p = '/';
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	  _snprintf (buf, sizeof(buf)-1, "emacs_dir=%s", modname);
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	  _putenv (strdup (buf));
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	}
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      /* Handle running emacs from the build directory: src/oo-spd/i386/  */

      /* FIXME: should use substring of get_emacs_configuration ().
	 But I don't think the Windows build supports alpha, mips etc
         anymore, so have taken the easy option for now.  */
      else if (p && stricmp (p, "\\i386") == 0)
	{
	  *p = 0;
	  p = strrchr (modname, '\\');
	  if (p != NULL)
	    {
	      *p = 0;
	      p = strrchr (modname, '\\');
	      if (p && stricmp (p, "\\src") == 0)
		{
		  char buf[SET_ENV_BUF_SIZE];

		  *p = 0;
		  for (p = modname; *p; p++)
		    if (*p == '\\') *p = '/';

		  _snprintf (buf, sizeof(buf)-1, "emacs_dir=%s", modname);
		  _putenv (strdup (buf));
		}
	    }
	}
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    }

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    for (i = 0; i < N_ENV_VARS; i++)
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      {
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	if (!getenv (env_vars[i].name))
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	  {
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	    int dont_free = 0;
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	    if ((lpval = w32_get_resource (env_vars[i].name, &dwType)) == NULL)
	      {
		lpval = env_vars[i].def_value;
		dwType = REG_EXPAND_SZ;
		dont_free = 1;
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	      }
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	    if (lpval)
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	      {
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		char buf1[SET_ENV_BUF_SIZE], buf2[SET_ENV_BUF_SIZE];
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		if (dwType == REG_EXPAND_SZ)
		  ExpandEnvironmentStrings ((LPSTR) lpval, buf1, sizeof(buf1));
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		else if (dwType == REG_SZ)
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		  strcpy (buf1, lpval);
		if (dwType == REG_EXPAND_SZ || dwType == REG_SZ)
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		  {
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		    _snprintf (buf2, sizeof(buf2)-1, "%s=%s", env_vars[i].name,
			       buf1);
		    _putenv (strdup (buf2));
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		  }
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		if (!dont_free)
		  xfree (lpval);
	      }
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	  }
      }
  }

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  /* Rebuild system configuration to reflect invoking system.  */
  Vsystem_configuration = build_string (EMACS_CONFIGURATION);

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  /* Another special case: on NT, the PATH variable is actually named
     "Path" although cmd.exe (perhaps NT itself) arranges for
     environment variable lookup and setting to be case insensitive.
     However, Emacs assumes a fully case sensitive environment, so we
     need to change "Path" to "PATH" to match the expectations of
     various elisp packages.  We do this by the sneaky method of
     modifying the string in the C runtime environ entry.

     The same applies to COMSPEC.  */
  {
    char ** envp;

    for (envp = environ; *envp; envp++)
      if (_strnicmp (*envp, "PATH=", 5) == 0)
	memcpy (*envp, "PATH=", 5);
      else if (_strnicmp (*envp, "COMSPEC=", 8) == 0)
	memcpy (*envp, "COMSPEC=", 8);
  }

  /* Remember the initial working directory for getwd, then make the
     real wd be the location of emacs.exe to avoid conflicts when
     renaming or deleting directories.  (We also don't call chdir when
     running subprocesses for the same reason.)  */
  if (!GetCurrentDirectory (MAXPATHLEN, startup_dir))
    abort ();

  {
    char *p;
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    static char modname[MAX_PATH];
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    if (!GetModuleFileName (NULL, modname, MAX_PATH))
      abort ();
    if ((p = strrchr (modname, '\\')) == NULL)
      abort ();
    *p = 0;

    SetCurrentDirectory (modname);
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    /* Ensure argv[0] has the full path to Emacs.  */
    *p = '\\';
    argv[0] = modname;
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  }

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  /* Determine if there is a middle mouse button, to allow parse_button
     to decide whether right mouse events should be mouse-2 or
     mouse-3. */
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  w32_num_mouse_buttons = GetSystemMetrics (SM_CMOUSEBUTTONS);
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  init_user_info ();
}

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char *
emacs_root_dir (void)
{
  static char root_dir[FILENAME_MAX];
  const char *p;

  p = getenv ("emacs_dir");
  if (p == NULL)
    abort ();
  strcpy (root_dir, p);
  root_dir[parse_root (root_dir, NULL)] = '\0';
  dostounix_filename (root_dir);
  return root_dir;
}

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/* We don't have scripts to automatically determine the system configuration
   for Emacs before it's compiled, and we don't want to have to make the
   user enter it, so we define EMACS_CONFIGURATION to invoke this runtime
   routine.  */

char *