w32.c 52.4 KB
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/* Utility and Unix shadow routines for GNU Emacs on Windows NT.
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   Copyright (C) 1994, 1995 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
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
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   Geoff Voelker (voelker@cs.washington.edu)                         7-29-94
*/

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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>
#include <sys/time.h>

/* must include CRT headers *before* config.h */
#include "config.h"
#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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#define getwd _getwd
#include "lisp.h"
#undef getwd

#include <pwd.h>

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#include <windows.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
#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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/* Get the current working directory.  */
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char *
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getwd (char *dir)
{
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  if (GetCurrentDirectory (MAXPATHLEN, dir) > 0)
    return dir;
  return NULL;
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}

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#ifndef HAVE_SOCKETS
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/* Emulate gethostname.  */
int
gethostname (char *buffer, int size)
{
  /* NT only allows small host names, so the buffer is 
     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.  */
  for (i = 0; i < nelem; i++) 
    {
      loadavg[i] = 0.0;
    }
  return i;
}

/* Emulate the Unix directory procedures opendir, closedir, 
   and readdir.  We can't use the procedures supplied in sysdep.c,
   so we provide them here.  */

struct direct dir_static;       /* simulated directory contents */
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static HANDLE dir_find_handle = INVALID_HANDLE_VALUE;
static int    dir_is_fat;
static char   dir_pathname[MAXPATHLEN+1];
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extern Lisp_Object Vw32_downcase_file_names;
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DIR *
opendir (char *filename)
{
  DIR *dirp;

  /* Opening is done by FindFirstFile.  However, a read is inherent to
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     this operation, so we defer the open until read time.  */
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  if (!(dirp = (DIR *) malloc (sizeof (DIR))))
    return NULL;
  if (dir_find_handle != INVALID_HANDLE_VALUE)
    return NULL;
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  dirp->dd_fd = 0;
  dirp->dd_loc = 0;
  dirp->dd_size = 0;

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  strncpy (dir_pathname, filename, MAXPATHLEN);
  dir_pathname[MAXPATHLEN] = '\0';
  dir_is_fat = is_fat_volume (filename, NULL);

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  return dirp;
}

void
closedir (DIR *dirp)
{
  /* If we have a find-handle open, close it.  */
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  if (dir_find_handle != INVALID_HANDLE_VALUE)
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    {
      FindClose (dir_find_handle);
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      dir_find_handle = INVALID_HANDLE_VALUE;
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    }
  xfree ((char *) dirp);
}

struct direct *
readdir (DIR *dirp)
{
  WIN32_FIND_DATA find_data;
  
  /* If we aren't dir_finding, do a find-first, otherwise do a find-next. */
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  if (dir_find_handle == INVALID_HANDLE_VALUE)
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    {
      char filename[MAXNAMLEN + 3];
      int ln;

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      strcpy (filename, dir_pathname);
      ln = strlen (filename) - 1;
      if (!IS_DIRECTORY_SEP (filename[ln]))
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	strcat (filename, "\\");
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      strcat (filename, "*");
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      dir_find_handle = FindFirstFile (filename, &find_data);

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      if (dir_find_handle == INVALID_HANDLE_VALUE)
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	return NULL;
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    }
  else
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    {
      if (!FindNextFile (dir_find_handle, &find_data))
	return NULL;
    }
  
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  /* Emacs never uses this value, so don't bother making it match
     value returned by stat().  */
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  dir_static.d_ino = 1;
  
  dir_static.d_reclen = sizeof (struct direct) - MAXNAMLEN + 3 +
    dir_static.d_namlen - dir_static.d_namlen % 4;
  
  dir_static.d_namlen = strlen (find_data.cFileName);
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  strcpy (dir_static.d_name, find_data.cFileName);
  if (dir_is_fat)
    _strlwr (dir_static.d_name);
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  else if (!NILP (Vw32_downcase_file_names))
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    {
      register char *p;
      for (p = dir_static.d_name; *p; p++)
	if (*p >= 'a' && *p <= 'z')
	  break;
      if (!*p)
	_strlwr (dir_static.d_name);
    }
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  return &dir_static;
}

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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 = 
{
  the_passwd_name,
  the_passwd_passwd,
  0,
  0,
  0,
  the_passwd_gecos,
  the_passwd_dir,
  the_passwd_shell,
};

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int 
getuid () 
{ 
  return the_passwd.pw_uid;
}

int 
geteuid () 
{ 
  /* 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.  */
  return getuid (); 
}

int 
getgid () 
{ 
  return the_passwd.pw_gid;
}

int 
getegid () 
{ 
  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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}

struct passwd *
getpwnam (char *name)
{
  struct passwd *pw;
  
  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;

  if (OpenProcessToken (GetCurrentProcess (), TOKEN_QUERY, &token)
      && GetTokenInformation (token, TokenUser,
			      (PVOID) user_sid, sizeof (user_sid), &trash)
      && LookupAccountSid (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;

	  pSIA = GetSidIdentifierAuthority (*((PSID *) user_sid));
	  /* 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 */
	  if (GetTokenInformation (token, TokenPrimaryGroup,
				   (PVOID) user_sid, sizeof (user_sid), &trash))
	    {
	      SID_IDENTIFIER_AUTHORITY * pSIA;

	      pSIA = GetSidIdentifierAuthority (*((PSID *) user_sid));
	      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)
    putenv ("HOME=c:/");
  if (getenv ("SHELL") == NULL)
    putenv ((GetVersion () & 0x80000000) ? "SHELL=command" : "SHELL=cmd");
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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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}

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

int 
sigsetmask (int signal_mask) 
{ 
  return 0;
}

int 
sigblock (int sig) 
{ 
  return 0;
}

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

int 
alarm (int seconds) 
{ 
  return 0;
}

int 
unrequest_sigio (void) 
{ 
  return 0;
}

int 
request_sigio (void) 
{ 
  return 0;
}

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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;
  
  /* Check both the current user and the local machine to see if 
     we have any resources.  */
  
  if (RegOpenKeyEx (HKEY_CURRENT_USER, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
    {
      lpvalue = NULL;

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

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

void
init_environment ()
{
  /* Check for environment variables and use registry if they don't exist */
  {
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    int i;
    LPBYTE lpval;
    DWORD dwType;
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    static char * env_vars[] = 
    {
      "HOME",
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      "PRELOAD_WINSOCK",
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      "emacs_dir",
      "EMACSLOADPATH",
      "SHELL",
      "EMACSDATA",
      "EMACSPATH",
      "EMACSLOCKDIR",
      "INFOPATH",
      "EMACSDOC",
      "TERM",
    };

    for (i = 0; i < (sizeof (env_vars) / sizeof (env_vars[0])); i++) 
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      {
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	if (!getenv (env_vars[i]) &&
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	    (lpval = w32_get_resource (env_vars[i], &dwType)) != NULL)
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	  {
	    if (dwType == REG_EXPAND_SZ)
	      {
		char buf1[500], buf2[500];

		ExpandEnvironmentStrings ((LPSTR) lpval, buf1, 500);
		_snprintf (buf2, 499, "%s=%s", env_vars[i], buf1);
		putenv (strdup (buf2));
	      }
	    else if (dwType == REG_SZ)
	      {
		char buf[500];
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		_snprintf (buf, 499, "%s=%s", env_vars[i], lpval);
		putenv (strdup (buf));
	      }
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	    xfree (lpval);
	  }
      }
  }

  init_user_info ();
}

/* 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.  */

static char configuration_buffer[32];

char *
get_emacs_configuration (void)
{
  char *arch, *oem, *os;

  /* Determine the processor type.  */
  switch (get_processor_type ()) 
    {

#ifdef PROCESSOR_INTEL_386
    case PROCESSOR_INTEL_386:
    case PROCESSOR_INTEL_486:
    case PROCESSOR_INTEL_PENTIUM:
      arch = "i386";
      break;
#endif

#ifdef PROCESSOR_INTEL_860
    case PROCESSOR_INTEL_860:
      arch = "i860";
      break;
#endif

#ifdef PROCESSOR_MIPS_R2000
    case PROCESSOR_MIPS_R2000:
    case PROCESSOR_MIPS_R3000:
    case PROCESSOR_MIPS_R4000:
      arch = "mips";
      break;
#endif

#ifdef PROCESSOR_ALPHA_21064
    case PROCESSOR_ALPHA_21064:
      arch = "alpha";
      break;
#endif

    default:
      arch = "unknown";
      break;
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    }
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  /* Let oem be "*" until we figure out how to decode the OEM field.  */
  oem = "*";

  os = (GetVersion () & 0x80000000) ? "win95" : "nt";

  sprintf (configuration_buffer, "%s-%s-%s%d.%d", arch, oem, os,
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	   get_w32_major_version (), get_w32_minor_version ());
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  return configuration_buffer;
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}

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#include <sys/timeb.h>

/* Emulate gettimeofday (Ulrich Leodolter, 1/11/95).  */
void 
gettimeofday (struct timeval *tv, struct timezone *tz)
{
  struct _timeb tb;
  _ftime (&tb);

  tv->tv_sec = tb.time;
  tv->tv_usec = tb.millitm * 1000L;
  if (tz) 
    {
      tz->tz_minuteswest = tb.timezone;	/* minutes west of Greenwich  */
      tz->tz_dsttime = tb.dstflag;	/* type of dst correction  */
    }
}

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/* ------------------------------------------------------------------------- */
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/* IO support and wrapper functions for W32 API. */
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/* ------------------------------------------------------------------------- */
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/* Place a wrapper around the MSVC version of ctime.  It returns NULL
   on network directories, so we handle that case here.  
   (Ulrich Leodolter, 1/11/95).  */
char *
sys_ctime (const time_t *t)
{
  char *str = (char *) ctime (t);
  return (str ? str : "Sun Jan 01 00:00:00 1970");
}

/* Emulate sleep...we could have done this with a define, but that
   would necessitate including windows.h in the files that used it.
   This is much easier.  */
void
sys_sleep (int seconds)
{
  Sleep (seconds * 1000);
}

/* Internal MSVC data and functions for low-level descriptor munging */
#if (_MSC_VER == 900)
extern char _osfile[];
#endif
extern int __cdecl _set_osfhnd (int fd, long h);
extern int __cdecl _free_osfhnd (int fd);

/* parallel array of private info on file handles */
filedesc fd_info [ MAXDESC ];

static struct {
  DWORD     serialnum;
  DWORD     maxcomp;
  DWORD     flags;
  char      name[32];
  char      type[32];
} volume_info;

/* Get information on the volume where name is held; set path pointer to
   start of pathname in name (past UNC header\volume header if present).  */
int
get_volume_info (const char * name, const char ** pPath)
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{
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  char temp[MAX_PATH];
  char *rootname = NULL;  /* default to current volume */

  if (name == NULL)
    return FALSE;

  /* find the root name of the volume if given */
  if (isalpha (name[0]) && name[1] == ':')
    {
      rootname = temp;
      temp[0] = *name++;
      temp[1] = *name++;
      temp[2] = '\\';
      temp[3] = 0;
    }
  else if (IS_DIRECTORY_SEP (name[0]) && IS_DIRECTORY_SEP (name[1]))
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    {
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      char *str = temp;
      int slashes = 4;
      rootname = temp;
      do
        {
	  if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
	    break;
	  *str++ = *name++;
	}
      while ( *name );

      *str++ = '\\';
      *str = 0;
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    }
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  if (pPath)
    *pPath = name;
    
  if (GetVolumeInformation (rootname,
			    volume_info.name, 32,
			    &volume_info.serialnum,
			    &volume_info.maxcomp,
			    &volume_info.flags,
			    volume_info.type, 32))
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    {
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      return TRUE;
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    }
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  return FALSE;
}

/* Determine if volume is FAT format (ie. only supports short 8.3
   names); also set path pointer to start of pathname in name.  */
int
is_fat_volume (const char * name, const char ** pPath)
{
  if (get_volume_info (name, pPath))
    return (volume_info.maxcomp == 12);
  return FALSE;
}

/* Map filename to a legal 8.3 name if necessary. */
const char *
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map_w32_filename (const char * name, const char ** pPath)
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{
  static char shortname[MAX_PATH];
  char * str = shortname;
  char c;
  char * path;

  if (is_fat_volume (name, &path)) /* truncate to 8.3 */
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    {
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      register int left = 8;	/* maximum number of chars in part */
      register int extn = 0;	/* extension added? */
      register int dots = 2;	/* maximum number of dots allowed */

      while (name < path)
	*str++ = *name++;	/* skip past UNC header */

      while ((c = *name++))
        {
	  switch ( c )
	    {
	    case '\\':
	    case '/':
	      *str++ = '\\';
	      extn = 0;		/* reset extension flags */
	      dots = 2;		/* max 2 dots */
	      left = 8;		/* max length 8 for main part */
	      break;
	    case ':':
	      *str++ = ':';
	      extn = 0;		/* reset extension flags */
	      dots = 2;		/* max 2 dots */
	      left = 8;		/* max length 8 for main part */
	      break;
	    case '.':
	      if ( dots )
	        {
		  /* Convert path components of the form .xxx to _xxx,
		     but leave . and .. as they are.  This allows .emacs
		     to be read as _emacs, for example.  */

		  if (! *name ||
		      *name == '.' ||
		      IS_DIRECTORY_SEP (*name))
		    {
		      *str++ = '.';
		      dots--;
		    }
		  else
		    {
		      *str++ = '_';
		      left--;
		      dots = 0;
		    }
		}
	      else if ( !extn )
	        {
		  *str++ = '.';
		  extn = 1;		/* we've got an extension */
		  left = 3;		/* 3 chars in extension */
		}
	      else
	        {
		  /* any embedded dots after the first are converted to _ */
		  *str++ = '_';
		}
	      break;
	    case '~':
	    case '#':			/* don't lose these, they're important */
	      if ( ! left )
		str[-1] = c;		/* replace last character of part */
	      /* FALLTHRU */
	    default:
	      if ( left )
	        {
		  *str++ = tolower (c);	/* map to lower case (looks nicer) */
		  left--;
		  dots = 0;		/* started a path component */
		}
	      break;
	    }
	}
      *str = '\0';
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    }
  else
    {
      strcpy (shortname, name);
      unixtodos_filename (shortname);
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    }
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  if (pPath)
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    *pPath = shortname + (path - name);
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  return shortname;
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}


/* Shadow some MSVC runtime functions to map requests for long filenames
   to reasonable short names if necessary.  This was originally added to
   permit running Emacs on NT 3.1 on a FAT partition, which doesn't support 
   long file names.  */

int
sys_access (const char * path, int mode)
{
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  return _access (map_w32_filename (path, NULL), mode);
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}

int
sys_chdir (const char * path)
{
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  return _chdir (map_w32_filename (path, NULL));
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}

int
sys_chmod (const char * path, int mode)
{
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  return _chmod (map_w32_filename (path, NULL), mode);
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}

int
sys_creat (const char * path, int mode)
{
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  return _creat (map_w32_filename (path, NULL), mode);
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}

FILE *
sys_fopen(const char * path, const char * mode)
{
  int fd;
  int oflag;
  const char * mode_save = mode;

  /* Force all file handles to be non-inheritable.  This is necessary to
     ensure child processes don't unwittingly inherit handles that might
     prevent future file access. */

  if (mode[0] == 'r')
    oflag = O_RDONLY;
  else if (mode[0] == 'w' || mode[0] == 'a')
    oflag = O_WRONLY | O_CREAT | O_TRUNC;
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  else
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    return NULL;

  /* Only do simplistic option parsing. */
  while (*++mode)
    if (mode[0] == '+')
      {
	oflag &= ~(O_RDONLY | O_WRONLY);
	oflag |= O_RDWR;
      }
    else if (mode[0] == 'b')
      {
	oflag &= ~O_TEXT;
	oflag |= O_BINARY;
      }
    else if (mode[0] == 't')
      {
	oflag &= ~O_BINARY;
	oflag |= O_TEXT;
      }
    else break;

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  fd = _open (map_w32_filename (path, NULL), oflag | _O_NOINHERIT, 0644);
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  if (fd < 0)
    return NULL;

  return fdopen (fd, mode_save);
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}
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int
sys_link (const char * path1, const char * path2)
{
  errno = EINVAL;
  return -1;
}

int
sys_mkdir (const char * path)
{
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  return _mkdir (map_w32_filename (path, NULL));
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}

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/* Because of long name mapping issues, we need to implement this
   ourselves.  Also, MSVC's _mktemp returns NULL when it can't generate
   a unique name, instead of setting the input template to an empty
   string.

   Standard algorithm seems to be use pid or tid with a letter on the
   front (in place of the 6 X's) and cycle through the letters to find a
   unique name.  We extend that to allow any reasonable character as the
   first of the 6 X's.  */
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char *
sys_mktemp (char * template)
{
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  char * p;
  int i;
  unsigned uid = GetCurrentThreadId ();
  static char first_char[] = "abcdefghijklmnopqrstuvwyz0123456789!%-_@#";

  if (template == NULL)
    return NULL;
  p = template + strlen (template);
  i = 5;
  /* replace up to the last 5 X's with uid in decimal */
  while (--p >= template && p[0] == 'X' && --i >= 0)
    {
      p[0] = '0' + uid % 10;
      uid /= 10;
    }

  if (i < 0 && p[0] == 'X')
    {
      i = 0;
      do
	{
	  int save_errno = errno;
	  p[0] = first_char[i];
	  if (sys_access (template, 0) < 0)
	    {
	      errno = save_errno;
	      return template;
	    }
	}
      while (++i < sizeof (first_char));
    }

  /* Template is badly formed or else we can't generate a unique name,
     so return empty string */
  template[0] = 0;
  return template;
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}

int
sys_open (const char * path, int oflag, int mode)
{
  /* Force all file handles to be non-inheritable. */
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  return _open (map_w32_filename (path, NULL), oflag | _O_NOINHERIT, mode);
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}

int
sys_rename (const char * oldname, const char * newname)
{
  char temp[MAX_PATH];
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  DWORD attr;
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  /* MoveFile on Win95 doesn't correctly change the short file name
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     alias in a number of circumstances (it is not easy to predict when
     just by looking at oldname and newname, unfortunately).  In these
     cases, renaming through a temporary name avoids the problem.

     A second problem on Win95 is that renaming through a temp name when
     newname is uppercase fails (the final long name ends up in
     lowercase, although the short alias might be uppercase) UNLESS the
     long temp name is not 8.3.

     So, on Win95 we always rename through a temp name, and we make sure
     the temp name has a long extension to ensure correct renaming.  */
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  strcpy (temp, map_w32_filename (oldname, NULL));
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  if (GetVersion () & 0x80000000)
    {
      char * p;

      if (p = strrchr (temp, '\\'))
	p++;
      else
	p = temp;
      strcpy (p, "__XXXXXX");
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      sys_mktemp (temp);
      /* Force temp name to require a manufactured 8.3 alias - this
	 seems to make the second rename work properly. */
      strcat (temp, ".long");
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      if (rename (map_w32_filename (oldname, NULL), temp) < 0)
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	return -1;
    }

  /* Emulate Unix behaviour - newname is deleted if it already exists
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     (at least if it is a file; don't do this for directories).
     However, don't do this if we are just changing the case of the file
     name - we will end up deleting the file we are trying to rename!  */
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  newname = map_w32_filename (newname, NULL);
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  if (stricmp (newname, temp) != 0
      && (attr = GetFileAttributes (newname)) != -1
      && (attr & FILE_ATTRIBUTE_DIRECTORY) == 0)
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    {
      _chmod (newname, 0666);
      _unlink (newname);
    }

  return rename (temp, newname);
}

int
sys_rmdir (const char * path)
{
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  return _rmdir (map_w32_filename (path, NULL));
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}

int
sys_unlink (const char * path)
{
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  return _unlink (map_w32_filename (path, NULL));
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}

static FILETIME utc_base_ft;
static long double utc_base;
static int init = 0;

static time_t
convert_time (FILETIME ft)
{
  long double ret;

  if (!init)
    {
      /* Determine the delta between 1-Jan-1601 and 1-Jan-1970. */
      SYSTEMTIME st;

      st.wYear = 1970;
      st.wMonth = 1;
      st.wDay = 1;
      st.wHour = 0;
      st.wMinute = 0;
      st.wSecond = 0;
      st.wMilliseconds = 0;

      SystemTimeToFileTime (&st, &utc_base_ft);
      utc_base = (long double) utc_base_ft.dwHighDateTime
	* 4096 * 1024 * 1024 + utc_base_ft.dwLowDateTime;
      init = 1;
    }

  if (CompareFileTime (&ft, &utc_base_ft) < 0)
    return 0;

  ret = (long double) ft.dwHighDateTime * 4096 * 1024 * 1024 + ft.dwLowDateTime;
  ret -= utc_base;
  return (time_t) (ret * 1e-7);
}

#if 0
/* in case we ever have need of this */
void
convert_from_time_t (time_t time, FILETIME * pft)
{
  long double tmp;

  if (!init)
    {
      /* Determine the delta between 1-Jan-1601 and 1-Jan-1970. */
      SYSTEMTIME st;

      st.wYear = 1970;
      st.wMonth = 1;
      st.wDay = 1;
      st.wHour = 0;
      st.wMinute = 0;
      st.wSecond = 0;
      st.wMilliseconds = 0;

      SystemTimeToFileTime (&st, &utc_base_ft);
      utc_base = (long double) utc_base_ft.dwHighDateTime
	* 4096 * 1024 * 1024 + utc_base_ft.dwLowDateTime;
      init = 1;
    }

  /* time in 100ns units since 1-Jan-1601 */
  tmp = (long double) time * 1e7 + utc_base;
  pft->dwHighDateTime = (DWORD) (tmp / (4096.0 * 1024 * 1024));
  pft->dwLowDateTime = (DWORD) (tmp - pft->dwHighDateTime);
}
#endif

/*  "PJW" algorithm (see the "Dragon" compiler book). */
static unsigned
hashval (const char * str)
{
  unsigned h = 0;
  unsigned g;
  while (*str)
    {
      h = (h << 4) + *str++;
      if ((g = h & 0xf0000000) != 0)
	h = (h ^ (g >> 24)) & 0x0fffffff;
    }
  return h;
}

/* Return the hash value of the canonical pathname, excluding the
   drive/UNC header, to get a hopefully unique inode number. */
static _ino_t
generate_inode_val (const char * name)
{
  char fullname[ MAX_PATH ];
  char * p;
  unsigned hash;

  GetFullPathName (name, sizeof (fullname), fullname, &p);
  get_volume_info (fullname, &p);
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  /* Normal W32 filesystems are still case insensitive. */
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  _strlwr (p);
  hash = hashval (p);
  return (_ino_t) (hash ^ (hash >> 16));
}

/* MSVC stat function can't cope with UNC names and has other bugs, so
   replace it with our own.  This also allows us to calculate consistent
   inode values without hacks in the main Emacs code. */
int
stat (const char * path, struct stat * buf)
{
  char * name;
  WIN32_FIND_DATA wfd;
  HANDLE fh;
  int permission;
  int len;
  int rootdir = FALSE;

  if (path == NULL || buf == NULL)
    {
      errno = EFAULT;
      return -1;
    }

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  name = (char *) map_w32_filename (path, &path);
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  /* must be valid filename, no wild cards */
  if (strchr (name, '*') || strchr (name, '?'))
    {
      errno = ENOENT;
      return -1;
    }

  /* Remove trailing directory separator, unless name is the root
     directory of a drive or UNC volume in which case ensure there
     is a trailing separator. */
  len = strlen (name);
  rootdir = (path >= name + len - 1
	     && (IS_DIRECTORY_SEP (*path) || *path == 0));
  name = strcpy (alloca (len + 2), name);

  if (rootdir)
    {
      if (!IS_DIRECTORY_SEP (name[len-1]))
	strcat (name, "\\");
      if (GetDriveType (name) < 2)
	{
	  errno = ENOENT;
	  return -1;
	}
      memset (&wfd, 0, sizeof (wfd));
      wfd.dwFileAttributes = FILE_ATTRIBUTE_DIRECTORY;
      wfd.ftCreationTime = utc_base_ft;
      wfd.ftLastAccessTime = utc_base_ft;
      wfd.ftLastWriteTime = utc_base_ft;
      strcpy (wfd.cFileName, name);
    }
  else
    {
      if (IS_DIRECTORY_SEP (name[len-1]))
	name[len - 1] = 0;
      fh = FindFirstFile (name, &wfd);
      if (fh == INVALID_HANDLE_VALUE)
	{
	  errno = ENOENT;
	  return -1;
	}
      FindClose (fh);
    }

  if (wfd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
    {
      buf->st_mode = _S_IFDIR;
      buf->st_nlink = 2;	/* doesn't really matter */
    }
  else
    {
#if 0
      /* This is more accurate in terms of gettting the correct number
	 of links, but is quite slow (it is noticable when Emacs is
	 making a list of file name completions). */
      BY_HANDLE_FILE_INFORMATION info;

      fh = CreateFile (name, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
		       NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

      if (GetFileInformationByHandle (fh, &info))
	{
	  switch (GetFileType (fh))
	    {
	    case FILE_TYPE_DISK:
	      buf->st_mode = _S_IFREG;
	      break;
	    case FILE_TYPE_PIPE:
	      buf->st_mode = _S_IFIFO;
	      break;
	    case FILE_TYPE_CHAR:
	    case FILE_TYPE_UNKNOWN:
	    default:
	      buf->st_mode = _S_IFCHR;
	    }
	  buf->st_nlink = info.nNumberOfLinks;
	  /* Could use file index, but this is not guaranteed to be
	     unique unless we keep a handle open all the time. */
	  /* buf->st_ino = info.nFileIndexLow ^ info.nFileIndexHigh; */
	  CloseHandle (fh);
	}
      else
	{
	  errno = EACCES;
	  return -1;
	}
#else
      buf->st_mode = _S_IFREG;
      buf->st_nlink = 1;
#endif
    }

  /* consider files to belong to current user */
  buf->st_uid = the_passwd.pw_uid;
  buf->st_gid = the_passwd.pw_gid;

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  /* volume_info is set indirectly by map_w32_filename */
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  buf->st_dev = volume_info.serialnum;
  buf->st_rdev = volume_info.serialnum;

  buf->st_ino = generate_inode_val (name);

  buf->st_size = wfd.nFileSizeLow;

  /* Convert timestamps to Unix format. */
  buf->st_mtime = convert_time (wfd.ftLastWriteTime);
  buf->st_atime = convert_time (wfd.ftLastAccessTime);
  if (buf->st_atime == 0) buf->st_atime = buf->st_mtime;
  buf->st_ctime = convert_time (wfd.ftCreationTime);
  if (buf->st_ctime == 0) buf->st_ctime = buf->st_mtime;

  /* determine rwx permissions */
  if (wfd.dwFileAttributes & FILE_ATTRIBUTE_READONLY)
    permission = _S_IREAD;
  else
    permission = _S_IREAD | _S_IWRITE;
  
  if (wfd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
    permission |= _S_IEXEC;
  else
    {
      char * p = strrchr (name, '.');
      if (p != NULL &&
	  (stricmp (p, ".exe") == 0 ||
	   stricmp (p, ".com") == 0 ||
	   stricmp (p, ".bat") == 0 ||
	   stricmp (p, ".cmd") == 0))
	permission |= _S_IEXEC;
    }

  buf->st_mode |= permission | (permission >> 3) | (permission >> 6);

  return 0;
}

#ifdef HAVE_SOCKETS

/* Wrappers for  winsock functions to map between our file descriptors
   and winsock's handles; also set h_errno for convenience.

   To allow Emacs to run on systems which don't have winsock support
   installed, we dynamically link to winsock on startup if present, and
   otherwise provide the minimum necessary functionality
   (eg. gethostname). */

/* function pointers for relevant socket functions */
int (PASCAL *pfn_WSAStartup) (WORD wVersionRequired, LPWSADATA lpWSAData);
void (PASCAL *pfn_WSASetLastError) (int iError);
int (PASCAL *pfn_WSAGetLastError) (void);
int (PASCAL *pfn_socket) (int af, int type, int protocol);
int (PASCAL *pfn_bind) (SOCKET s, const struct sockaddr *addr, int namelen);
int (PASCAL *pfn_connect) (SOCKET s, const struct sockaddr *addr, int namelen);
int (PASCAL *pfn_ioctlsocket) (SOCKET s, long cmd, u_long *argp);
int (PASCAL *pfn_recv) (SOCKET s, char * buf, int len, int flags);
int (PASCAL *pfn_send) (SOCKET s, const char * buf, int len, int flags);
int (PASCAL *pfn_closesocket) (SOCKET s);
int (PASCAL *pfn_shutdown) (SOCKET s, int how);
int (PASCAL *pfn_WSACleanup) (void);

u_short (PASCAL *pfn_htons) (u_short hostshort);
u_short (PASCAL *pfn_ntohs) (u_short netshort);
unsigned long (PASCAL *pfn_inet_addr) (const char * cp);
int (PASCAL *pfn_gethostname) (char * name, int namelen);
struct hostent * (PASCAL *pfn_gethostbyname) (const char * name);
struct servent * (PASCAL *pfn_getservbyname) (const char * name, const char * proto);
1412 1413 1414 1415 1416 1417
  
/* SetHandleInformation is only needed to make sockets non-inheritable. */
BOOL (WINAPI *pfn_SetHandleInformation) (HANDLE object, DWORD mask, DWORD flags);
#ifndef HANDLE_FLAG_INHERIT
#define HANDLE_FLAG_INHERIT	1
#endif
1418

1419 1420
HANDLE winsock_lib;
static int winsock_inuse;
1421

1422
BOOL
1423 1424
term_winsock (void)
{
1425
  if (winsock_lib != NULL && winsock_inuse == 0)
1426
    {
1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
      /* Not sure what would cause WSAENETDOWN, or even if it can happen
	 after WSAStartup returns successfully, but it seems reasonable
	 to allow unloading winsock anyway in that case. */
      if (pfn_WSACleanup () == 0 ||
	  pfn_WSAGetLastError () == WSAENETDOWN)
	{
	  if (FreeLibrary (winsock_lib))
	  winsock_lib = NULL;
	  return TRUE;
	}
1437
    }
1438
  return FALSE;
1439 1440
}

1441 1442
BOOL
init_winsock (int load_now)
1443 1444 1445
{
  WSADATA  winsockData;

1446 1447
  if (winsock_lib != NULL)
    return TRUE;
1448 1449 1450 1451 1452 1453

  pfn_SetHandleInformation = NULL;
  pfn_SetHandleInformation
    = (void *) GetProcAddress (GetModuleHandle ("kernel32.dll"),
			       "SetHandleInformation");

1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482
  winsock_lib = LoadLibrary ("wsock32.dll");

  if (winsock_lib != NULL)
    {
      /* dynamically link to socket functions */

#define LOAD_PROC(fn) \
      if ((pfn_##fn = (void *) GetProcAddress (winsock_lib, #fn)) == NULL) \
        goto fail;

      LOAD_PROC( WSAStartup );
      LOAD_PROC( WSASetLastError );
      LOAD_PROC( WSAGetLastError );
      LOAD_PROC( socket );
      LOAD_PROC( bind );
      LOAD_PROC( connect );
      LOAD_PROC( ioctlsocket );
      LOAD_PROC( recv );
      LOAD_PROC( send );
      LOAD_PROC( closesocket );
      LOAD_PROC( shutdown );
      LOAD_PROC( htons );
      LOAD_PROC( ntohs );
      LOAD_PROC( inet_addr );
      LOAD_PROC( gethostname );
      LOAD_PROC( gethostbyname );
      LOAD_PROC( getservbyname );
      LOAD_PROC( WSACleanup );

1483 1484
#undef LOAD_PROC

1485 1486 1487
      /* specify version 1.1 of winsock */
      if (pfn_WSAStartup (0x101, &winsockData) == 0)
        {
1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504
	  if (winsockData.wVersion != 0x101)
	    goto fail;

	  if (!load_now)
	    {
	      /* Report that winsock exists and is usable, but leave
		 socket functions disabled.  I am assuming that calling
		 WSAStartup does not require any network interaction,
		 and in particular does not cause or require a dial-up
		 connection to be established. */

	      pfn_WSACleanup ();
	      FreeLibrary (winsock_lib);
	      winsock_lib = NULL;
	    }
	  winsock_inuse = 0;
	  return TRUE;
1505 1506 1507 1508
	}

    fail:
      FreeLibrary (winsock_lib);
1509
      winsock_lib = NULL;
1510
    }
1511 1512

  return FALSE;
1513 1514 1515 1516 1517 1518 1519 1520 1521 1522
}


int h_errno = 0;

/* function to set h_errno for compatability; map winsock error codes to
   normal system codes where they overlap (non-overlapping definitions
   are already in <sys/socket.h> */
static void set_errno ()
{
1523
  if (winsock_lib == NULL)
1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543
    h_errno = EINVAL;
  else
    h_errno = pfn_WSAGetLastError ();

  switch (h_errno)
    {
    case WSAEACCES:		h_errno = EACCES; break;
    case WSAEBADF: 		h_errno = EBADF; break;
    case WSAEFAULT:		h_errno = EFAULT; break;
    case WSAEINTR: 		h_errno = EINTR; break;
    case WSAEINVAL:		h_errno = EINVAL; break;
    case WSAEMFILE:		h_errno = EMFILE; break;
    case WSAENAMETOOLONG: 	h_errno = ENAMETOOLONG; break;
    case WSAENOTEMPTY:		h_errno = ENOTEMPTY; break;
    }
  errno = h_errno;
}

static void check_errno ()
{
1544
  if (h_errno == 0 && winsock_lib != NULL)
1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566
    pfn_WSASetLastError (0);
}

/* [andrewi 3-May-96] I've had conflicting results using both methods,
   but I believe the method of keeping the socket handle separate (and
   insuring it is not inheritable) is the correct one. */

//#define SOCK_REPLACE_HANDLE

#ifdef SOCK_REPLACE_HANDLE
#define SOCK_HANDLE(fd) ((SOCKET) _get_osfhandle (fd))
#else
#define SOCK_HANDLE(fd) ((SOCKET) fd_info[fd].hnd)
#endif

int
sys_socket(int af, int type, int protocol)
{
  int fd;
  long s;
  child_process * cp;

1567
  if (winsock_lib == NULL)
1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603
    {
      h_errno = ENETDOWN;
      return INVALID_SOCKET;
    }

  check_errno ();

  /* call the real socket function */
  s = (long) pfn_socket (af, type, protocol);
  
  if (s != INVALID_SOCKET)
    {
      /* Although under NT 3.5 _open_osfhandle will accept a socket
	 handle, if opened with SO_OPENTYPE == SO_SYNCHRONOUS_NONALERT,
	 that does not work under NT 3.1.  However, we can get the same
	 effect by using a backdoor function to replace an existing
	 descriptor handle with the one we want. */

      /* allocate a file descriptor (with appropriate flags) */
      fd = _open ("NUL:", _O_RDWR);
      if (fd >= 0)
        {
#ifdef SOCK_REPLACE_HANDLE
	  /* now replace handle to NUL with our socket handle */
	  CloseHandle ((HANDLE) _get_osfhandle (fd));
	  _free_osfhnd (fd);
	  _set_osfhnd (fd, s);
	  /* setmode (fd, _O_BINARY); */
#else
	  /* Make a non-inheritable copy of the socket handle. */
	  {
	    HANDLE parent;
	    HANDLE new_s = INVALID_HANDLE_VALUE;

	    parent = GetCurrentProcess ();

1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624
	    /* Apparently there is a bug in NT 3.51 with some service
	       packs, which prevents using DuplicateHandle to make a
	       socket handle non-inheritable (causes WSACleanup to
	       hang).  The work-around is to use SetHandleInformation
	       instead if it is available and implemented. */
	    if (!pfn_SetHandleInformation
		|| !pfn_SetHandleInformation ((HANDLE) s,
					      HANDLE_FLAG_INHERIT,
					      HANDLE_FLAG_INHERIT))
	      {
		DuplicateHandle (parent,
				 (HANDLE) s,
				 parent,
				 &new_s,
				 0,
				 FALSE,
				 DUPLICATE_SAME_ACCESS);
		pfn_closesocket (s);
		s = (SOCKET) new_s;
	      }
	    fd_info[fd].hnd = (HANDLE) s;
1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646
	  }
#endif

	  /* set our own internal flags */
	  fd_info[fd].flags = FILE_SOCKET | FILE_BINARY | FILE_READ | FILE_WRITE;

	  cp = new_child ();
	  if (cp)
	    {
	      cp->fd = fd;
	      cp->status = STATUS_READ_ACKNOWLEDGED;

	      /* attach child_process to fd_info */
	      if (fd_info[ fd ].cp != NULL)
		{
		  DebPrint (("sys_socket: fd_info[%d] apparently in use!\n", fd));
		  abort ();
		}

	      fd_info[ fd ].cp = cp;

	      /* success! */
1647
	      winsock_inuse++;	/* count open sockets */
1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665
	      return fd;
	    }

	  /* clean up */
	  _close (fd);
	}
      pfn_closesocket (s);
      h_errno = EMFILE;
    }
  set_errno ();

  return -1;
}


int
sys_bind (int s, const struct sockaddr * addr, int namelen)
{
1666
  if (winsock_lib == NULL)
1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687
    {
      h_errno = ENOTSOCK;
      return SOCKET_ERROR;
    }

  check_errno ();
  if (fd_info[s].flags & FILE_SOCKET)
    {
      int rc = pfn_bind (SOCK_HANDLE (s), addr, namelen);
      if (rc == SOCKET_ERROR)
	set_errno ();
      return rc;
    }
  h_errno = ENOTSOCK;
  return SOCKET_ERROR;
}


int
sys_connect (int s, const struct sockaddr * name, int namelen)
{
1688
  if (winsock_lib == NULL)
1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708
    {
      h_errno = ENOTSOCK;
      return SOCKET_ERROR;
    }

  check_errno ();
  if (fd_info[s].flags & FILE_SOCKET)
    {
      int rc = pfn_connect (SOCK_HANDLE (s), name, namelen);
      if (rc == SOCKET_ERROR)
	set_errno ();
      return rc;
    }
  h_errno = ENOTSOCK;
  return SOCKET_ERROR;
}

u_short
sys_htons (u_short hostshort)
{
1709
  return (winsock_lib != NULL) ?
1710 1711 1712 1713 1714 1715
    pfn_htons (hostshort) : hostshort;
}

u_short
sys_ntohs (u_short netshort)
{
1716
  return (winsock_lib != NULL) ?
1717 1718 1719 1720 1721 1722
    pfn_ntohs (netshort) : netshort;
}

unsigned long
sys_inet_addr (const char * cp)
{
1723
  return (winsock_lib != NULL) ?
1724 1725 1726 1727 1728 1729
    pfn_inet_addr (cp) : INADDR_NONE;
}

int
sys_gethostname (char * name, int namelen)
{
1730
  if (winsock_lib != NULL)
1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744
    return pfn_gethostname (name, namelen);

  if (namelen > MAX_COMPUTERNAME_LENGTH)
    return !GetComputerName (name, &namelen);

  h_errno = EFAULT;
  return SOCKET_ERROR;
}

struct hostent *
sys_gethostbyname(const char * name)
{
  struct hostent * host;

1745
  if (winsock_lib == NULL)
1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762
    {
      h_errno = ENETDOWN;
      return NULL;
    }

  check_errno ();
  host = pfn_gethostbyname (name);
  if (!host)
    set_errno ();
  return host;
}

struct servent *
sys_getservbyname(const char * name, const char * proto)
{
  struct servent * serv;

1763
  if (winsock_lib == NULL)
1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811
    {
      h_errno = ENETDOWN;
      return NULL;
    }

  check_errno ();
  serv = pfn_getservbyname (name, proto);
  if (!serv)
    set_errno ();
  return serv;
}

#endif /* HAVE_SOCKETS */


/* Shadow main io functions: we need to handle pipes and sockets more
   intelligently, and implement non-blocking mode as well. */

int
sys_close (int fd)
{
  int rc;

  if (fd < 0 || fd >= MAXDESC)
    {
      errno = EBADF;
      return -1;
    }

  if (fd_info[fd].cp)
    {
      child_process * cp = fd_info[fd].cp;

      fd_info[fd].cp = NULL;

      if (CHILD_ACTIVE (cp))
        {
	  /* if last descriptor to active child_process then cleanup */
	  int i;
	  for (i = 0; i < MAXDESC; i++)
	    {
	      if (i == fd)
		continue;
	      if (fd_info[i].cp == cp)
		break;
	    }
	  if (i == MAXDESC)
	    {
1812
#ifdef HAVE_SOCKETS
1813 1814
	      if (fd_info[fd].flags & FILE_SOCKET)
		{
1815 1816
#ifndef SOCK_REPLACE_HANDLE
		  if (winsock_lib == NULL) abort ();
1817 1818 1819

		  pfn_shutdown (SOCK_HANDLE (fd), 2);
		  rc = pfn_closesocket (SOCK_HANDLE (fd));
1820 1821
#endif
		  winsock_inuse--; /* count open sockets */
1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933
		}
#endif
	      delete_child (cp);
	    }
	}
    }

  /* Note that sockets do not need special treatment here (at least on
     NT and Win95 using the standard tcp/ip stacks) - it appears that
     closesocket is equivalent to CloseHandle, which is to be expected
     because socket handles are fully fledged kernel handles. */
  rc = _close (fd);

  if (rc == 0)
    fd_info[fd].flags = 0;

  return rc;
}

int
sys_dup (int fd)
{
  int new_fd;

  new_fd = _dup (fd);
  if (new_fd >= 0)
    {
      /* duplicate our internal info as well */
      fd_info[new_fd] = fd_info[fd];
    }
  return new_fd;
}


int
sys_dup2 (int src, int dst)
{
  int rc;

  if (dst < 0 || dst >= MAXDESC)
    {
      errno = EBADF;
      return -1;
    }

  /* make sure we close the destination first if it's a pipe or socket */
  if (src != dst && fd_info[dst].flags != 0)
    sys_close (dst);
  
  rc = _dup2 (src, dst);
  if (rc == 0)
    {
      /* duplicate our internal info as well */
      fd_info[dst] = fd_info[src];
    }
  return rc;
}

/* From callproc.c  */
extern Lisp_Object Vbinary_process_input;
extern Lisp_Object Vbinary_process_output;

/* Unix pipe() has only one arg */
int
sys_pipe (int * phandles)
{
  int rc;
  unsigned flags;
  child_process * cp;

  /* make pipe handles non-inheritable; when we spawn a child,
     we replace the relevant handle with an inheritable one. */
  rc = _pipe (phandles, 0, _O_NOINHERIT);

  if (rc == 0)
    {
      /* set internal flags, and put read and write handles into binary
	 mode as necessary; if not in binary mode, set the MSVC internal
	 FDEV (0x40) flag to prevent _read from treating ^Z as eof (this
	 could otherwise allow Emacs to hang because it then waits
	 indefinitely for the child process to exit, when it might not be
	 finished). */
      flags = FILE_PIPE | FILE_READ;
      if (!NILP (Vbinary_process_output))
	{
	  flags |= FILE_BINARY;
	  setmode (phandles[0], _O_BINARY);
	}
#if (_MSC_VER == 900)
      else
	_osfile[phandles[0]] |= 0x40;
#endif

      fd_info[phandles[0]].flags = flags;

      flags = FILE_PIPE | FILE_WRITE;
      if (!NILP (Vbinary_process_input))
	{
	  flags |= FILE_BINARY;
	  setmode (phandles[1], _O_BINARY);
	}
#if (_MSC_VER == 900)
      else
	_osfile[phandles[1]] |= 0x40;
#endif

      fd_info[phandles[1]].flags = flags;
    }

  return rc;
}

1934
/* From ntproc.c */
1935
extern Lisp_Object Vw32_pipe_read_delay;
1936

1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962
/* Function to do blocking read of one byte, needed to implement
   select.  It is only allowed on sockets and pipes. */
int
_sys_read_ahead (int fd)
{
  child_process * cp;
  int rc;

  if (fd < 0 || fd >= MAXDESC)
    return STATUS_READ_ERROR;

  cp = fd_info[fd].cp;

  if (cp == NULL || cp->fd != fd || cp->status != STATUS_READ_READY)
    return STATUS_READ_ERROR;

  if ((fd_info[fd].flags & (FILE_PIPE | FILE_SOCKET)) == 0
      || (fd_info[fd].flags & FILE_READ) == 0)
    {
      DebPrint (("_sys_read_ahead: internal error: fd %d is not a pipe or socket!\n", fd));
      abort ();
    }
  
  cp->status = STATUS_READ_IN_PROGRESS;
  
  if (fd_info[fd].flags & FILE_PIPE)
1963 1964 1965 1966 1967 1968 1969 1970 1971
    {
      /* Use read to get CRLF translation */
      rc = _read (fd, &cp->chr, sizeof (char));

      /* Give subprocess time to buffer some more output for us before
	 reporting that input is available; we need this because Win95
	 connects DOS programs to pipes by making the pipe appear to be
	 the normal console stdout - as a result most DOS programs will
	 write to stdout without buffering, ie.  one character at a
1972
	 time.  Even some W32 programs do this - "dir" in a command
1973 1974 1975
	 shell on NT is very slow if we don't do this. */
      if (rc > 0)
	{
1976
	  int wait = XINT (Vw32_pipe_read_delay);
1977 1978 1979 1980 1981 1982 1983 1984 1985 1986

	  if (wait > 0)
	    Sleep (wait);
	  else if (wait < 0)
	    while (++wait <= 0)
	      /* Yield remainder of our time slice, effectively giving a
		 temporary priority boost to the child process. */
	      Sleep (0);
	}
    }
1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073
#ifdef HAVE_SOCKETS
  else if (fd_info[fd].flags & FILE_SOCKET)
    rc = pfn_recv (SOCK_HANDLE (fd), &cp->chr, sizeof (char), 0);
#endif
  
  if (rc == sizeof (char))
    cp->status = STATUS_READ_SUCCEEDED;
  else
    cp->status = STATUS_READ_FAILED;

  return cp->status;
}

int
sys_read (int fd, char * buffer, unsigned int count)
{
  int nchars;
  int extra = 0;
  int to_read;
  DWORD waiting;

  if (fd < 0 || fd >= MAXDESC)
    {
      errno = EBADF;
      return -1;
    }

  if (fd_info[fd].flags & (FILE_PIPE | FILE_SOCKET))
    {
      child_process *cp = fd_info[fd].cp;

      if ((fd_info[fd].flags & FILE_READ) == 0)
        {
	  errno = EBADF;
	  return -1;
	}

      /* presence of a child_process structure means we are operating in
	 non-blocking mode - otherwise we just call _read directly.
	 Note that the child_process structure might be missing because
	 reap_subprocess has been called; in this case the pipe is
	 already broken, so calling _read on it is okay. */
      if (cp)
        {
	  int current_status = cp->status;

	  switch (current_status)
	    {
	    case STATUS_READ_FAILED:
	    case STATUS_READ_ERROR:
	      /* report normal EOF */
	      return 0;

	    case STATUS_READ_READY:
	    case STATUS_READ_IN_PROGRESS:
	      DebPrint (("sys_read called when read is in progress\n"));
	      errno = EWOULDBLOCK;
	      return -1;

	    case STATUS_READ_SUCCEEDED:
	      /* consume read-ahead char */
	      *buffer++ = cp->chr;
	      count--;
	      extra = 1;
	      cp->status = STATUS_READ_ACKNOWLEDGED;
	      ResetEvent (cp->char_avail);

	    case STATUS_READ_ACKNOWLEDGED:
	      break;

	    default:
	      DebPrint (("sys_read: bad status %d\n", current_status));
	      errno = EBADF;
	      return -1;
	    }

	  if (fd_info[fd].flags & FILE_PIPE)
	    {
	      PeekNamedPipe ((HANDLE) _get_osfhandle (fd), NULL, 0, NULL, &waiting, NULL);
	      to_read = min (waiting, (DWORD) count);
      
	      /* Use read to get CRLF translation */
	      nchars = _read (fd, buffer, to_read);
	    }
#ifdef HAVE_SOCKETS
	  else /* FILE_SOCKET */
	    {
2074
	      if (winsock_lib == NULL) abort ();
2075 2076 2077 2078 2079 2080 2081 2082