code.delx.au - gnu-emacs/blob - src/w32.c

   1 /* Utility and Unix shadow routines for GNU Emacs on Windows NT.
   2    Copyright (C) 1994, 1995 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.
  20
  21    Geoff Voelker (voelker@cs.washington.edu)                         7-29-94
  22 */
  23
  24
  25 /* Define stat before including config.h.  */
  26 #include <string.h>
  27 #include <sys/stat.h>
  28 #include <malloc.h>
  29
  30 static int is_toplevel_share_name (char *);
  31 static int stat_toplevel_share (char *, void *);
  32
  33 int
  34 nt_stat (char *filename, struct stat *statbuf)
  35 {
  36   int l = strlen (filename);
  37   char *str = NULL;
  38
  39   /* stat has a bug when passed a name of a directory with a trailing
  40      backslash (but a trailing forward slash works fine).  */
  41   if (filename[l - 1] == '\\')
  42     {
  43       str = (char *) alloca (l + 1);
  44       strcpy (str, filename);
  45       str[l - 1] = '/';
  46       return stat (str, statbuf);
  47     }
  48
  49   if (stat (filename, statbuf) == 0)
  50     return 0;
  51   else if (is_toplevel_share_name (filename))
  52     return stat_toplevel_share (filename, statbuf);
  53   else
  54     return -1;
  55 }
  56
  57 /* Place a wrapper around the NT version of ctime.  It returns NULL
  58    on network directories, so we handle that case here.
  59    Define it before including config.h.  (Ulrich Leodolter, 1/11/95).  */
  60 char *
  61 nt_ctime (const time_t *t)
  62 {
  63   char *str = (char *) ctime (t);
  64   return (str ? str : "Sun Jan 01 00:00:00 1970");
  65 }
  66
  67 #include <config.h>
  68 #include <windows.h>
  69 #include <stdlib.h>
  70 #include <stdio.h>
  71 #include <io.h>
  72 #include <fcntl.h>
  73 #include <ctype.h>
  74
  75 #define getwd _getwd
  76 #include "lisp.h"
  77 #undef getwd
  78
  79 #include <pwd.h>
  80
  81 #include "ndir.h"
  82 #include "ntheap.h"
  83
  84 extern int report_file_error (char *, Lisp_Object);
  85
  86 /* Routines for extending stat above.  */
  87 static int
  88 get_unassigned_drive_letter ()
  89 {
  90   int i;
  91   unsigned int mask;
  92
  93   mask = GetLogicalDrives ();
  94   for (i = 0; i < 26; i++)
  95     {
  96       if (mask & (1 << i))
  97         continue;
  98       break;
  99     }
 100   return (i == 26 ? -1 : 'A' + i);
 101 }
 102
 103 void dostounix_filename (char *);
 104
 105 /* Return nonzero if NAME is of the form \\host\share (forward slashes
 106    also valid), otherwise return 0.  */
 107 static int
 108 is_toplevel_share_name (char *filename)
 109 {
 110   int len;
 111   char *name;
 112   char *host;
 113   char *share;
 114   char *suffix;
 115
 116   len = strlen (filename);
 117   name = alloca (len + 1);
 118   strcpy (name, filename);
 119
 120   dostounix_filename (name);
 121   if (name[0] != '/' || name[1] != '/')
 122     return 0;
 123
 124   host = strtok (&name[2], "/");
 125   share = strtok (NULL, "/");
 126   suffix = strtok (NULL, "/");
 127   if (!host || !share || suffix)
 128     return 0;
 129
 130   return 1;
 131 }
 132
 133
 134 /* FILENAME is of the form \\host\share, and stat can't handle names
 135    of this form.  But stat can handle \\host\share if it's been
 136    assigned a drive letter.  So we create a network connection to this
 137    share, assign it a drive letter, stat the drive letter, and
 138    disconnect from the share.  Hassle... */
 139 static int
 140 stat_toplevel_share (char *filename, void *statbuf)
 141 {
 142   NETRESOURCE net;
 143   int drive_letter;
 144   char drive[4];
 145   int result;
 146
 147   drive_letter = get_unassigned_drive_letter ();
 148   if (drive_letter < 0)
 149     return -1;
 150
 151   drive[0] = drive_letter;
 152   drive[1] = ':';
 153   drive[2] = '\0';
 154   net.dwType = RESOURCETYPE_DISK;
 155   net.lpLocalName = drive;
 156   net.lpRemoteName = filename;
 157   net.lpProvider = NULL;
 158
 159   switch (WNetAddConnection2 (&net, NULL, NULL, 0))
 160     {
 161     case NO_ERROR:
 162       break;
 163     case ERROR_ALREADY_ASSIGNED:
 164     default:
 165       return -1;
 166     }
 167
 168   /* Name the toplevel directory on the drive letter. */
 169   drive[2] = '/';
 170   drive[3] = '\0';
 171   result = stat (drive, (void *) statbuf);
 172
 173   /* Strip the slash so we can disconnect. */
 174   drive[2] = '\0';
 175   if (WNetCancelConnection2 (drive, 0, TRUE) != NO_ERROR)
 176     result = -1;
 177
 178   return result;
 179 }
 180
 181
 182 /* Get the current working directory.  */
 183 int
 184 getwd (char *dir)
 185 {
 186   return GetCurrentDirectory (MAXPATHLEN, dir);
 187 }
 188
 189 /* Emulate gethostname.  */
 190 int
 191 gethostname (char *buffer, int size)
 192 {
 193   /* NT only allows small host names, so the buffer is
 194      certainly large enough.  */
 195   return !GetComputerName (buffer, &size);
 196 }
 197
 198 /* Emulate getloadavg.  */
 199 int
 200 getloadavg (double loadavg[], int nelem)
 201 {
 202   int i;
 203
 204   /* A faithful emulation is going to have to be saved for a rainy day.  */
 205   for (i = 0; i < nelem; i++)
 206     {
 207       loadavg[i] = 0.0;
 208     }
 209   return i;
 210 }
 211
 212 /* Emulate sleep...we could have done this with a define, but that
 213    would necessitate including windows.h in the files that used it.
 214    This is much easier.  */
 215 void
 216 nt_sleep (int seconds)
 217 {
 218   Sleep (seconds * 1000);
 219 }
 220
 221 /* Emulate the Unix directory procedures opendir, closedir,
 222    and readdir.  We can't use the procedures supplied in sysdep.c,
 223    so we provide them here.  */
 224
 225 struct direct dir_static;       /* simulated directory contents */
 226 static int    dir_finding;
 227 static HANDLE dir_find_handle;
 228
 229 DIR *
 230 opendir (char *filename)
 231 {
 232   DIR *dirp;
 233
 234   /* Opening is done by FindFirstFile.  However, a read is inherent to
 235      this operation, so we have a flag to handle the open at read
 236      time.  This flag essentially means "there is a find-handle open and
 237      it needs to be closed."  */
 238
 239   if (!(dirp = (DIR *) malloc (sizeof (DIR))))
 240     {
 241       return 0;
 242     }
 243
 244   dirp->dd_fd = 0;
 245   dirp->dd_loc = 0;
 246   dirp->dd_size = 0;
 247
 248   /* This is tacky, but we need the directory name for our
 249      implementation of readdir.  */
 250   strncpy (dirp->dd_buf, filename, DIRBLKSIZ);
 251   return dirp;
 252 }
 253
 254 void
 255 closedir (DIR *dirp)
 256 {
 257   /* If we have a find-handle open, close it.  */
 258   if (dir_finding)
 259     {
 260       FindClose (dir_find_handle);
 261       dir_finding = 0;
 262     }
 263   xfree ((char *) dirp);
 264 }
 265
 266 struct direct *
 267 readdir (DIR *dirp)
 268 {
 269   WIN32_FIND_DATA find_data;
 270
 271   /* If we aren't dir_finding, do a find-first, otherwise do a find-next. */
 272   if (!dir_finding)
 273     {
 274       char filename[MAXNAMLEN + 3];
 275       int ln;
 276
 277       strncpy (filename, dirp->dd_buf, MAXNAMLEN);
 278       ln = strlen (filename)-1;
 279       if (!IS_ANY_SEP (filename[ln]))
 280         strcat (filename, "\\");
 281       strcat (filename, "*.*");
 282
 283       dir_find_handle = FindFirstFile (filename, &find_data);
 284
 285       if (dir_find_handle == INVALID_HANDLE_VALUE)
 286         return NULL;
 287
 288       dir_finding = 1;
 289     }
 290   else
 291     {
 292       if (!FindNextFile (dir_find_handle, &find_data))
 293         return NULL;
 294     }
 295
 296   /* NT's unique ID for a file is 64 bits, so we have to fake it here.
 297      This should work as long as we never use 0.  */
 298   dir_static.d_ino = 1;
 299
 300   dir_static.d_reclen = sizeof (struct direct) - MAXNAMLEN + 3 +
 301     dir_static.d_namlen - dir_static.d_namlen % 4;
 302
 303   dir_static.d_namlen = strlen (find_data.cFileName);
 304   strncpy (dir_static.d_name, find_data.cFileName, MAXNAMLEN);
 305
 306   return &dir_static;
 307 }
 308
 309 /* Emulate getpwuid and getpwnam.  */
 310
 311 int getuid ();  /* forward declaration */
 312
 313 #define PASSWD_FIELD_SIZE 256
 314
 315 static char the_passwd_name[PASSWD_FIELD_SIZE];
 316 static char the_passwd_passwd[PASSWD_FIELD_SIZE];
 317 static char the_passwd_gecos[PASSWD_FIELD_SIZE];
 318 static char the_passwd_dir[PASSWD_FIELD_SIZE];
 319 static char the_passwd_shell[PASSWD_FIELD_SIZE];
 320
 321 static struct passwd the_passwd =
 322 {
 323   the_passwd_name,
 324   the_passwd_passwd,
 325   0,
 326   0,
 327   0,
 328   the_passwd_gecos,
 329   the_passwd_dir,
 330   the_passwd_shell,
 331 };
 332
 333 struct passwd *
 334 getpwuid (int uid)
 335 {
 336   int size = PASSWD_FIELD_SIZE;
 337
 338   if (!GetUserName (the_passwd.pw_name, &size))
 339     return NULL;
 340
 341   the_passwd.pw_passwd[0] = '\0';
 342   the_passwd.pw_uid = 0;
 343   the_passwd.pw_gid = 0;
 344   strcpy (the_passwd.pw_gecos, the_passwd.pw_name);
 345   the_passwd.pw_dir[0] = '\0';
 346   the_passwd.pw_shell[0] = '\0';
 347
 348   return &the_passwd;
 349 }
 350
 351 struct passwd *
 352 getpwnam (char *name)
 353 {
 354   struct passwd *pw;
 355
 356   pw = getpwuid (getuid ());
 357   if (!pw)
 358     return pw;
 359
 360   if (strcmp (name, pw->pw_name))
 361     return NULL;
 362
 363   return pw;
 364 }
 365
 366
 367 /* We don't have scripts to automatically determine the system configuration
 368    for Emacs before it's compiled, and we don't want to have to make the
 369    user enter it, so we define EMACS_CONFIGURATION to invoke this runtime
 370    routine.  */
 371
 372 static char configuration_buffer[32];
 373
 374 char *
 375 get_emacs_configuration (void)
 376 {
 377   char *arch, *oem, *os;
 378
 379   /* Determine the processor type.  */
 380   switch (get_processor_type ())
 381     {
 382
 383 #ifdef PROCESSOR_INTEL_386
 384     case PROCESSOR_INTEL_386:
 385     case PROCESSOR_INTEL_486:
 386     case PROCESSOR_INTEL_PENTIUM:
 387       arch = "i386";
 388       break;
 389 #endif
 390
 391 #ifdef PROCESSOR_INTEL_860
 392     case PROCESSOR_INTEL_860:
 393       arch = "i860";
 394       break;
 395 #endif
 396
 397 #ifdef PROCESSOR_MIPS_R2000
 398     case PROCESSOR_MIPS_R2000:
 399     case PROCESSOR_MIPS_R3000:
 400     case PROCESSOR_MIPS_R4000:
 401       arch = "mips";
 402       break;
 403 #endif
 404
 405 #ifdef PROCESSOR_ALPHA_21064
 406     case PROCESSOR_ALPHA_21064:
 407       arch = "alpha";
 408       break;
 409 #endif
 410
 411     default:
 412       arch = "unknown";
 413       break;
 414     }
 415
 416   /* Let oem be "*" until we figure out how to decode the OEM field.  */
 417   oem = "*";
 418
 419 #ifdef WINDOWS95
 420   os = "win";
 421 #else
 422   os = "nt";
 423 #endif
 424
 425   sprintf (configuration_buffer, "%s-%s-%s%d.%d", arch, oem, os,
 426            get_nt_major_version (), get_nt_minor_version ());
 427   return configuration_buffer;
 428 }
 429
 430 /* Conjure up inode and device numbers that will serve the purpose
 431    of Emacs.  Return 1 upon success, 0 upon failure.  */
 432 int
 433 get_inode_and_device_vals (Lisp_Object filename, Lisp_Object *p_inode,
 434                            Lisp_Object *p_device)
 435 {
 436   /* File uids on NT are found using a handle to a file, which
 437      implies that it has been opened.  Since we want to be able
 438      to stat an arbitrary file, we must open it, get the info,
 439      and then close it.
 440
 441      Also, NT file uids are 64-bits.  This is a problem.  */
 442
 443   HANDLE handle;
 444   BOOL result;
 445   DWORD attrs;
 446   BY_HANDLE_FILE_INFORMATION info;
 447
 448   /* We have to stat files and directories differently, so check
 449      to see what filename references.  */
 450   attrs = GetFileAttributes (XSTRING (filename)->data);
 451   if (attrs == 0xFFFFFFFF) {
 452     return 0;
 453   }
 454   if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
 455     /* Conjure up bogus, but unique, values.  */
 456     attrs = GetTickCount ();
 457     *p_inode = make_number (attrs);
 458     *p_device = make_number (attrs);
 459     return 1;
 460   }
 461
 462   /* FIXME:  It shouldn't be opened without READ access, but NT on x86
 463      doesn't allow GetFileInfo in that case (NT on mips does).  */
 464
 465   handle = CreateFile (XSTRING (filename)->data,
 466                        GENERIC_READ,
 467                        FILE_SHARE_READ | FILE_SHARE_WRITE,
 468                        NULL,
 469                        OPEN_EXISTING,
 470                        FILE_ATTRIBUTE_NORMAL,
 471                        NULL);
 472   if (handle == INVALID_HANDLE_VALUE)
 473     return 0;
 474
 475   result = GetFileInformationByHandle (handle, &info);
 476   CloseHandle (handle);
 477   if (!result)
 478     return 0;
 479
 480   *p_inode = make_number (info.nFileIndexLow);          /* use the low value */
 481   *p_device = make_number (info.dwVolumeSerialNumber);
 482
 483   return 1;
 484 }
 485
 486 /* The following pipe routines are used to support our fork emulation.
 487    Since NT's crt dup always creates inherited handles, we
 488    must be careful in setting up pipes.  First create
 489    non-inherited pipe handles, then create an inherited handle
 490    to the write end by dup-ing it, and then close the non-inherited
 491    end that was just duped.  This gives us one non-inherited handle
 492    on the read end and one inherited handle to the write end.  As
 493    the parent, we close the inherited handle to the write end after
 494    spawning the child.  */
 495
 496 /* From callproc.c  */
 497 extern Lisp_Object Vbinary_process_input;
 498 extern Lisp_Object Vbinary_process_output;
 499
 500 void
 501 pipe_with_inherited_out (int fds[2])
 502 {
 503   int inherit_out;
 504   unsigned int flags = _O_NOINHERIT;
 505
 506   if (!NILP (Vbinary_process_output))
 507     flags |= _O_BINARY;
 508
 509   _pipe (fds, 0, flags);
 510   inherit_out = dup (fds[1]);
 511   close (fds[1]);
 512   fds[1] = inherit_out;
 513 }
 514
 515 void
 516 pipe_with_inherited_in (int fds[2])
 517 {
 518   int inherit_in;
 519   unsigned int flags = _O_NOINHERIT;
 520
 521   if (!NILP (Vbinary_process_input))
 522     flags |= _O_BINARY;
 523
 524   _pipe (fds, 0, flags);
 525   inherit_in = dup (fds[0]);
 526   close (fds[0]);
 527   fds[0] = inherit_in;
 528 }
 529
 530 /* The following two routines are used to manipulate stdin, stdout, and
 531    stderr of our child processes.
 532
 533    Assuming that in, out, and err are inherited, we make them stdin,
 534    stdout, and stderr of the child as follows:
 535
 536    - Save the parent's current standard handles.
 537    - Set the parent's standard handles to the handles being passed in.
 538      (Note that _get_osfhandle is an io.h procedure that
 539      maps crt file descriptors to NT file handles.)
 540    - Spawn the child, which inherits in, out, and err as stdin,
 541      stdout, and stderr. (see Spawnve)
 542    - Reset the parent's standard handles to the saved handles.
 543      (see reset_standard_handles)
 544    We assume that the caller closes in, out, and err after calling us.  */
 545
 546 void
 547 prepare_standard_handles (int in, int out, int err, HANDLE handles[4])
 548 {
 549   HANDLE parent, stdin_save, stdout_save, stderr_save, err_handle;
 550
 551 #ifdef WINDOWS95
 552   /* The Win95 beta doesn't set the standard handles correctly.
 553      Handicap subprocesses until we get a version that works correctly.
 554      Undefining the subprocesses macro reveals other incompatibilities,
 555      so, since we're expecting subprocs to work in the near future,
 556      disable them here.  */
 557   report_file_error ("Subprocesses currently disabled on Win95", Qnil);
 558 #endif
 559
 560   parent = GetCurrentProcess ();
 561   stdin_save = GetStdHandle (STD_INPUT_HANDLE);
 562   stdout_save = GetStdHandle (STD_OUTPUT_HANDLE);
 563   stderr_save = GetStdHandle (STD_ERROR_HANDLE);
 564
 565 #ifndef HAVE_NTGUI
 566   if (!DuplicateHandle (parent,
 567                        GetStdHandle (STD_INPUT_HANDLE),
 568                        parent,
 569                        &stdin_save,
 570                        0,
 571                        FALSE,
 572                        DUPLICATE_SAME_ACCESS))
 573     report_file_error ("Duplicating parent's input handle", Qnil);
 574
 575   if (!DuplicateHandle (parent,
 576                        GetStdHandle (STD_OUTPUT_HANDLE),
 577                        parent,
 578                        &stdout_save,
 579                        0,
 580                        FALSE,
 581                        DUPLICATE_SAME_ACCESS))
 582     report_file_error ("Duplicating parent's output handle", Qnil);
 583
 584   if (!DuplicateHandle (parent,
 585                        GetStdHandle (STD_ERROR_HANDLE),
 586                        parent,
 587                        &stderr_save,
 588                        0,
 589                        FALSE,
 590                        DUPLICATE_SAME_ACCESS))
 591     report_file_error ("Duplicating parent's error handle", Qnil);
 592 #endif /* !HAVE_NTGUI */
 593
 594   if (!SetStdHandle (STD_INPUT_HANDLE, (HANDLE) _get_osfhandle (in)))
 595     report_file_error ("Changing stdin handle", Qnil);
 596
 597   if (!SetStdHandle (STD_OUTPUT_HANDLE, (HANDLE) _get_osfhandle (out)))
 598     report_file_error ("Changing stdout handle", Qnil);
 599
 600   /* We lose data if we use the same handle to the pipe for stdout and
 601      stderr, so make a duplicate.  This took a while to find.  */
 602   if (out == err)
 603     {
 604       if (!DuplicateHandle (parent,
 605                            (HANDLE) _get_osfhandle (err),
 606                            parent,
 607                            &err_handle,
 608                            0,
 609                            TRUE,
 610                            DUPLICATE_SAME_ACCESS))
 611         report_file_error ("Duplicating out handle to make err handle.",
 612                           Qnil);
 613     }
 614   else
 615     {
 616       err_handle = (HANDLE) _get_osfhandle (err);
 617     }
 618
 619   if (!SetStdHandle (STD_ERROR_HANDLE, err_handle))
 620     report_file_error ("Changing stderr handle", Qnil);
 621
 622   handles[0] = stdin_save;
 623   handles[1] = stdout_save;
 624   handles[2] = stderr_save;
 625   handles[3] = err_handle;
 626 }
 627
 628 void
 629 reset_standard_handles (int in, int out, int err, HANDLE handles[4])
 630 {
 631   HANDLE stdin_save = handles[0];
 632   HANDLE stdout_save = handles[1];
 633   HANDLE stderr_save = handles[2];
 634   HANDLE err_handle = handles[3];
 635   int i;
 636
 637 #ifndef HAVE_NTGUI
 638   if (!SetStdHandle (STD_INPUT_HANDLE, stdin_save))
 639     report_file_error ("Resetting input handle", Qnil);
 640
 641   if (!SetStdHandle (STD_OUTPUT_HANDLE, stdout_save))
 642     {
 643       i = GetLastError ();
 644       report_file_error ("Resetting output handle", Qnil);
 645     }
 646
 647   if (!SetStdHandle (STD_ERROR_HANDLE, stderr_save))
 648     report_file_error ("Resetting error handle", Qnil);
 649 #endif /* !HAVE_NTGUI */
 650
 651   if (out == err)
 652     {
 653       /* If out and err are the same handle, then we duplicated out
 654          and stuck it in err_handle.  Close the duplicate to clean up.  */
 655       if (!CloseHandle (err_handle))
 656         report_file_error ("Closing error handle duplicated from out.",
 657                           Qnil);
 658     }
 659 }
 660
 661 int
 662 random ()
 663 {
 664   /* rand () on NT gives us 15 random bits...hack together 30 bits.  */
 665   return ((rand () << 15) | rand ());
 666 }
 667
 668 void
 669 srandom (int seed)
 670 {
 671   srand (seed);
 672 }
 673
 674 /* Destructively turn backslashes into slashes.  */
 675 void
 676 dostounix_filename (p)
 677      register char *p;
 678 {
 679   while (*p)
 680     {
 681       if (*p == '\\')
 682         *p = '/';
 683       p++;
 684     }
 685 }
 686
 687 /* Routines that are no-ops on NT but are defined to get Emacs to compile.  */
 688
 689
 690 int
 691 sigsetmask (int signal_mask)
 692 {
 693   return 0;
 694 }
 695
 696 int
 697 sigblock (int sig)
 698 {
 699   return 0;
 700 }
 701
 702 int
 703 kill (int pid, int signal)
 704 {
 705   return 0;
 706 }
 707
 708 int
 709 setpgrp (int pid, int gid)
 710 {
 711   return 0;
 712 }
 713
 714 int
 715 alarm (int seconds)
 716 {
 717   return 0;
 718 }
 719
 720 int
 721 unrequest_sigio (void)
 722 {
 723   return 0;
 724 }
 725
 726 int
 727 request_sigio (void)
 728 {
 729   return 0;
 730 }
 731
 732 int
 733 getuid ()
 734 {
 735   char buffer[256];
 736   int size = 256;
 737
 738   if (!GetUserName (buffer, &size))
 739     /* Assume all powers upon failure.  */
 740     return 0;
 741
 742   if (!stricmp ("administrator", buffer))
 743     return 0;
 744   else
 745     /* A complete fabrication...is there anything to base it on? */
 746     return 123;
 747 }
 748
 749 int
 750 geteuid ()
 751 {
 752   /* I could imagine arguing for checking to see whether the user is
 753      in the Administrators group and returning a UID of 0 for that
 754      case, but I don't know how wise that would be in the long run.  */
 755   return getuid ();
 756 }
 757
 758 /* Remove all CR's that are followed by a LF.
 759    (From msdos.c...probably should figure out a way to share it,
 760    although this code isn't going to ever change.)  */
 761 int
 762 crlf_to_lf (n, buf)
 763      register int n;
 764      register unsigned char *buf;
 765 {
 766   unsigned char *np = buf;
 767   unsigned char *startp = buf;
 768   unsigned char *endp = buf + n;
 769
 770   if (n == 0)
 771     return n;
 772   while (buf < endp - 1)
 773     {
 774       if (*buf == 0x0d)
 775         {
 776           if (*(++buf) != 0x0a)
 777             *np++ = 0x0d;
 778         }
 779       else
 780         *np++ = *buf++;
 781     }
 782   if (buf < endp)
 783     *np++ = *buf++;
 784   return np - startp;
 785 }
 786
 787 #define REG_ROOT "SOFTWARE\\GNU\\Emacs\\"
 788
 789 LPBYTE
 790 nt_get_resource (key, lpdwtype)
 791     char *key;
 792     LPDWORD lpdwtype;
 793 {
 794   LPBYTE lpvalue;
 795   HKEY hrootkey = NULL;
 796   DWORD cbData;
 797   BOOL ok = FALSE;
 798
 799   /* Check both the current user and the local machine to see if
 800      we have any resources.  */
 801
 802   if (RegOpenKeyEx (HKEY_CURRENT_USER, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
 803     {
 804       lpvalue = NULL;
 805
 806       if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS
 807           && (lpvalue = (LPBYTE) xmalloc (cbData)) != NULL
 808           && RegQueryValueEx (hrootkey, key, NULL, lpdwtype, lpvalue, &cbData) == ERROR_SUCCESS)
 809         {
 810           return (lpvalue);
 811         }
 812
 813       if (lpvalue) xfree (lpvalue);
 814
 815       RegCloseKey (hrootkey);
 816     }
 817
 818   if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
 819     {
 820       lpvalue = NULL;
 821
 822       if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS &&
 823           (lpvalue = (LPBYTE) xmalloc (cbData)) != NULL &&
 824           RegQueryValueEx (hrootkey, key, NULL, lpdwtype, lpvalue, &cbData) == ERROR_SUCCESS)
 825         {
 826           return (lpvalue);
 827         }
 828
 829       if (lpvalue) xfree (lpvalue);
 830
 831       RegCloseKey (hrootkey);
 832     }
 833
 834   return (NULL);
 835 }
 836
 837 void
 838 init_environment ()
 839 {
 840   /* Open a console window to display messages during dumping. */
 841   if (!initialized)
 842     AllocConsole ();
 843
 844   /* Check for environment variables and use registry if they don't exist */
 845   {
 846       int i;
 847       LPBYTE lpval;
 848       DWORD dwType;
 849
 850       static char * env_vars[] =
 851       {
 852           "emacs_path",
 853           "EMACSLOADPATH",
 854           "SHELL",
 855           "EMACSDATA",
 856           "EMACSPATH",
 857           "EMACSLOCKDIR",
 858           "INFOPATH",
 859           "EMACSDOC",
 860           "TERM",
 861       };
 862
 863       for (i = 0; i < (sizeof (env_vars) / sizeof (env_vars[0])); i++)
 864         {
 865           if (!getenv (env_vars[i]) &&
 866               (lpval = nt_get_resource (env_vars[i], &dwType)) != NULL)
 867             {
 868               if (dwType == REG_EXPAND_SZ)
 869                 {
 870                   char buf1[500], buf2[500];
 871
 872                   ExpandEnvironmentStrings ((LPSTR) lpval, buf1, 500);
 873                   _snprintf (buf2, 499, "%s=%s", env_vars[i], buf1);
 874                   putenv (strdup (buf2));
 875                 }
 876               else if (dwType == REG_SZ)
 877                 {
 878                   char buf[500];
 879
 880                   _snprintf (buf, 499, "%s=%s", env_vars[i], lpval);
 881                   putenv (strdup (buf));
 882                 }
 883
 884               xfree (lpval);
 885             }
 886         }
 887     }
 888 }
 889
 890 #ifdef HAVE_TIMEVAL
 891 #include <sys/timeb.h>
 892
 893 /* Emulate gettimeofday (Ulrich Leodolter, 1/11/95).  */
 894 void
 895 gettimeofday (struct timeval *tv, struct timezone *tz)
 896 {
 897   struct _timeb tb;
 898   _ftime (&tb);
 899
 900   tv->tv_sec = tb.time;
 901   tv->tv_usec = tb.millitm * 1000L;
 902   if (tz)
 903     {
 904       tz->tz_minuteswest = tb.timezone; /* minutes west of Greenwich  */
 905       tz->tz_dsttime = tb.dstflag;      /* type of dst correction  */
 906     }
 907 }
 908 #endif /* HAVE_TIMEVAL */
 909
 910
 911 #ifdef PIGSFLY
 912 Keep this around...we might need it later.
 913 #ifdef WINDOWSNT
 914 {
 915   /*
 916    * Find the user's real name by opening the process token and looking
 917    * up the name associated with the user-sid in that token.
 918    */
 919
 920   char            b[256], Name[256], RefD[256];
 921   DWORD           length = 256, rlength = 256, trash;
 922   HANDLE          Token;
 923   SID_NAME_USE    User;
 924
 925   if (1)
 926     Vuser_real_login_name = build_string ("foo");
 927   else if (!OpenProcessToken (GetCurrentProcess (), TOKEN_QUERY, &Token))
 928     {
 929       Vuser_real_login_name = build_string ("unknown");
 930     }
 931   else if (!GetTokenInformation (Token, TokenUser, (PVOID)b, 256,
 932                                  &trash))
 933     {
 934       CloseHandle (Token);
 935       Vuser_real_login_name = build_string ("unknown");
 936     }
 937   else if (!LookupAccountSid ((void *)0, (PSID)b, Name, &length, RefD,
 938                               &rlength, &User))
 939     {
 940       CloseHandle (Token);
 941       Vuser_real_login_name = build_string ("unknown");
 942     }
 943   else
 944     Vuser_real_login_name = build_string (Name);
 945 }
 946 #else   /* not WINDOWSNT */
 947 #endif  /* not WINDOWSNT */
 948 #endif  /* PIGSFLY */