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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 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 <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>
#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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#include "lisp.h"

#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
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#undef shutdown
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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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extern Lisp_Object Vw32_downcase_file_names;
extern Lisp_Object Vw32_generate_fake_inodes;
extern Lisp_Object Vw32_get_true_file_attributes;

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)
{
  /* 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;
}

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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)
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    putenv (os_subtype == OS_WIN95 ? "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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}

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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;

  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;
  size -= len;

  do
    {
      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;
    }
  while (p != NULL && *p);

  return TRUE;
}


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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;
	
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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);
	}
	
      if (lpvalue) xfree (lpvalue);
	
      RegCloseKey (hrootkey);
    } 
  
  return (NULL);
}

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char *get_emacs_configuration (void);
extern Lisp_Object Vsystem_configuration;

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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",
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      "CMDPROXY",
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      "EMACSDATA",
      "EMACSPATH",
      "EMACSLOCKDIR",
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      /* We no longer set INFOPATH because Info-default-directory-list
	 is then ignored.  We use a hook in winnt.el instead.  */
      /*      "INFOPATH", */
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      "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])
	    && (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);
	  }
      }
  }

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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;
    char modname[MAX_PATH];

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

    SetCurrentDirectory (modname);
  }

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  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 = "*";

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  os = (GetVersion () & OS_WIN95) ? "windows95" : "nt";
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  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);
}

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/* Internal MSVC functions for low-level descriptor munging */
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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 ];

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typedef struct volume_info_data {
  struct volume_info_data * next;

  /* time when info was obtained */
  DWORD     timestamp;

  /* actual volume info */
  char *    root_dir;
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  DWORD     serialnum;
  DWORD     maxcomp;
  DWORD     flags;
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  char *    name;
  char *    type;
} volume_info_data;

/* Global referenced by various functions.  */
static volume_info_data volume_info;

/* Vector to indicate which drives are local and fixed (for which cached
   data never expires).  */
static BOOL fixed_drives[26];

/* Consider cached volume information to be stale if older than 10s,
   at least for non-local drives.  Info for fixed drives is never stale.  */
#define DRIVE_INDEX( c ) ( (c) <= 'Z' ? (c) - 'A' : (c) - 'a' )
#define VOLINFO_STILL_VALID( root_dir, info )		\
  ( ( isalpha (root_dir[0]) &&				\
      fixed_drives[ DRIVE_INDEX (root_dir[0]) ] )	\
    || GetTickCount () - info->timestamp < 10000 )

/* Cache support functions.  */

/* Simple linked list with linear search is sufficient.  */
static volume_info_data *volume_cache = NULL;

static volume_info_data *
lookup_volume_info (char * root_dir)
{
  volume_info_data * info;

  for (info = volume_cache; info; info = info->next)
    if (stricmp (info->root_dir, root_dir) == 0)
      break;
  return info;
}

static void
add_volume_info (char * root_dir, volume_info_data * info)
{
  info->root_dir = strdup (root_dir);
  info->next = volume_cache;
  volume_cache = info;
}


/* Wrapper for GetVolumeInformation, which uses caching to avoid
   performance penalty (~2ms on 486 for local drives, 7.5ms for local
   cdrom drive, ~5-10ms or more for remote drives on LAN).  */
volume_info_data *
GetCachedVolumeInformation (char * root_dir)
{
  volume_info_data * info;
  char default_root[ MAX_PATH ];

  /* NULL for root_dir means use root from current directory.  */
  if (root_dir == NULL)
    {
      if (GetCurrentDirectory (MAX_PATH, default_root) == 0)
	return NULL;
      parse_root (default_root, &root_dir);
      *root_dir = 0;
      root_dir = default_root;
    }

  /* Local fixed drives can be cached permanently.  Removable drives
     cannot be cached permanently, since the volume name and serial
     number (if nothing else) can change.  Remote drives should be
     treated as if they are removable, since there is no sure way to
     tell whether they are or not.  Also, the UNC association of drive
     letters mapped to remote volumes can be changed at any time (even
     by other processes) without notice.
   
     As a compromise, so we can benefit from caching info for remote
     volumes, we use a simple expiry mechanism to invalidate cache
     entries that are more than ten seconds old.  */

#if 0
  /* No point doing this, because WNetGetConnection is even slower than
     GetVolumeInformation, consistently taking ~50ms on a 486 (FWIW,
     GetDriveType is about the only call of this type which does not
     involve network access, and so is extremely quick).  */

  /* Map drive letter to UNC if remote. */
  if ( isalpha( root_dir[0] ) && !fixed[ DRIVE_INDEX( root_dir[0] ) ] )
    {
      char remote_name[ 256 ];
      char drive[3] = { root_dir[0], ':' };

      if (WNetGetConnection (drive, remote_name, sizeof (remote_name))
	  == NO_ERROR)
	/* do something */ ;
    }
#endif

  info = lookup_volume_info (root_dir);

  if (info == NULL || ! VOLINFO_STILL_VALID (root_dir, info))
  {
    char  name[ 256 ];
    DWORD serialnum;
    DWORD maxcomp;
    DWORD flags;
    char  type[ 256 ];

    /* Info is not cached, or is stale. */
    if (!GetVolumeInformation (root_dir,
			       name, sizeof (name),
			       &serialnum,
			       &maxcomp,
			       &flags,
			       type, sizeof (type)))
      return NULL;

    /* Cache the volume information for future use, overwriting existing
       entry if present.  */
    if (info == NULL)
      {
	info = (volume_info_data *) xmalloc (sizeof (volume_info_data));
	add_volume_info (root_dir, info);
      }
    else
      {
	free (info->name);
	free (info->type);
      }

    info->name = strdup (name);
    info->serialnum = serialnum;
    info->maxcomp = maxcomp;
    info->flags = flags;
    info->type = strdup (type);
    info->timestamp = GetTickCount ();
  }

  return info;
}
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/* 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 */
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  volume_info_data * info;
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  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;
    
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  info = GetCachedVolumeInformation (rootname);
  if (info != NULL)
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    {
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      /* Set global referenced by other functions.  */
      volume_info = *info;
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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;
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  const char * save_name = name;
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  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 - save_name);
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  return shortname;
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}

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/* 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 */
static HANDLE dir_find_handle = INVALID_HANDLE_VALUE;
static int    dir_is_fat;
static char   dir_pathname[MAXPATHLEN+1];
static WIN32_FIND_DATA dir_find_data;

DIR *
opendir (char *filename)
{
  DIR *dirp;

  /* Opening is done by FindFirstFile.  However, a read is inherent to
     this operation, so we defer the open until read time.  */

  if (!(dirp = (DIR *) malloc (sizeof (DIR))))
    return NULL;
  if (dir_find_handle != INVALID_HANDLE_VALUE)
    return NULL;

  dirp->dd_fd = 0;
  dirp->dd_loc = 0;
  dirp->dd_size = 0;

  strncpy (dir_pathname, map_w32_filename (filename, NULL), MAXPATHLEN);
  dir_pathname[MAXPATHLEN] = '\0';
  dir_is_fat = is_fat_volume (filename, NULL);

  return dirp;
}

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

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

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

      dir_find_handle = FindFirstFile (filename, &dir_find_data);

      if (dir_find_handle == INVALID_HANDLE_VALUE)
	return NULL;
    }
  else
    {
      if (!FindNextFile (dir_find_handle, &dir_find_data))
	return NULL;
    }
  
  /* Emacs never uses this value, so don't bother making it match
     value returned by stat().  */
  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 (dir_find_data.cFileName);
  strcpy (dir_static.d_name, dir_find_data.cFileName);
  if (dir_is_fat)
    _strlwr (dir_static.d_name);
  else if (!NILP (Vw32_downcase_file_names))
    {
      register char *p;
      for (p = dir_static.d_name; *p; p++)
	if (*p >= 'a' && *p <= 'z')
	  break;
      if (!*p)
	_strlwr (dir_static.d_name);
    }
  
  return &dir_static;
}

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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;

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  return _fdopen (fd, mode_save);
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}
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/* This only works on NTFS volumes, but is useful to have.  */
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int
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sys_link (const char * old, const char * new)
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{
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  HANDLE fileh;
  int   result = -1;
  char oldname[MAX_PATH], newname[MAX_PATH];

  if (old == NULL || new == NULL)
    {
      errno = ENOENT;
      return -1;
    }

  strcpy (oldname, map_w32_filename (old, NULL));
  strcpy (newname, map_w32_filename (new, NULL));

  fileh = CreateFile (oldname, 0, 0, NULL, OPEN_EXISTING,
		      FILE_FLAG_BACKUP_SEMANTICS, NULL);
  if (fileh != INVALID_HANDLE_VALUE)
    {
      int wlen;

      /* Confusingly, the "alternate" stream name field does not apply
         when restoring a hard link, and instead contains the actual
         stream data for the link (ie. the name of the link to create).
         The WIN32_STREAM_ID structure before the cStreamName field is
         the stream header, which is then immediately followed by the
         stream data.  */

      struct {
	WIN32_STREAM_ID wid;
	WCHAR wbuffer[MAX_PATH];	/* extra space for link name */
      } data;

      wlen = MultiByteToWideChar (CP_ACP, MB_PRECOMPOSED, newname, -1,
				  data.wid.cStreamName, MAX_PATH);
      if (wlen > 0)
	{
	  LPVOID context = NULL;
	  DWORD wbytes = 0;

	  data.wid.dwStreamId = BACKUP_LINK;
	  data.wid.dwStreamAttributes = 0;
	  data.wid.Size.LowPart = wlen * sizeof(WCHAR);
	  data.wid.Size.HighPart = 0;
	  data.wid.dwStreamNameSize = 0;

	  if (BackupWrite (fileh, (LPBYTE)&data,
			   offsetof (WIN32_STREAM_ID, cStreamName)
			   + data.wid.Size.LowPart,
			   &wbytes, FALSE, FALSE, &context)
	      && BackupWrite (fileh, NULL, 0, &wbytes, TRUE, FALSE, &context))
	    {
	      /* succeeded */
	      result = 0;
	    }
	  else
	    {
	      /* Should try mapping GetLastError to errno; for now just
		 indicate a general error (eg. links not supported).  */
	      errno = EINVAL;  // perhaps EMLINK?
	    }
	}

      CloseHandle (fileh);
    }
  else
    errno = ENOENT;

  return result;
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}

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 Windows 95 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.

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     A second problem on Windows 95 is that renaming through a temp name when
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     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.

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     So, on Windows 95 we always rename through a temp name, and we make sure
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     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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Geoff Voelker committed
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  if (os_subtype == OS_WIN95)
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    {
      char * p;

      if (p = strrchr (temp, '\\'))
	p++;
      else
	p = temp;
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      /* Force temp name to require a manufactured 8.3 alias - this
	 seems to make the second rename work properly. */
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      strcpy (p, "_rename_temp.XXXXXX");
      sys_mktemp (temp);
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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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  /* TODO: Use GetInformationByHandle (on NT) to ensure newname and temp
     do not refer to the same file, eg. through share aliases.  */
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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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