w32.c 156 KB
Newer Older
1
/* Utility and Unix shadow routines for GNU Emacs on the Microsoft W32 API.
Glenn Morris's avatar
Glenn Morris committed
2
   Copyright (C) 1994, 1995, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
Glenn Morris's avatar
Glenn Morris committed
3
                 2007, 2008, 2009, 2010  Free Software Foundation, Inc.
Richard M. Stallman's avatar
Richard M. Stallman committed
4

5 6
This file is part of GNU Emacs.

7
GNU Emacs is free software: you can redistribute it and/or modify
8
it under the terms of the GNU General Public License as published by
9 10
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
11 12 13 14 15 16 17

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
18
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
19

20
/*
Richard M. Stallman's avatar
Richard M. Stallman committed
21 22
   Geoff Voelker (voelker@cs.washington.edu)                         7-29-94
*/
Geoff Voelker's avatar
Geoff Voelker committed
23
#include <stddef.h> /* for offsetof */
Richard M. Stallman's avatar
Richard M. Stallman committed
24 25
#include <stdlib.h>
#include <stdio.h>
26
#include <float.h>	/* for DBL_EPSILON */
Richard M. Stallman's avatar
Richard M. Stallman committed
27
#include <io.h>
28
#include <errno.h>
Richard M. Stallman's avatar
Richard M. Stallman committed
29 30
#include <fcntl.h>
#include <ctype.h>
31
#include <signal.h>
Karl Heuer's avatar
Karl Heuer committed
32
#include <sys/file.h>
33
#include <sys/time.h>
34
#include <sys/utime.h>
35
#include <mbstring.h>	/* for _mbspbrk */
36
#include <math.h>
37
#include <setjmp.h>
38 39

/* must include CRT headers *before* config.h */
Pavel Janík's avatar
Pavel Janík committed
40 41 42 43 44

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
#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
Richard M. Stallman's avatar
Richard M. Stallman committed
65

Andrew Innes's avatar
Andrew Innes committed
66 67
#undef strerror

Richard M. Stallman's avatar
Richard M. Stallman committed
68 69 70
#include "lisp.h"

#include <pwd.h>
Lars Hansen's avatar
Lars Hansen committed
71
#include <grp.h>
Richard M. Stallman's avatar
Richard M. Stallman committed
72

73 74 75 76
#ifdef __GNUC__
#define _ANONYMOUS_UNION
#define _ANONYMOUS_STRUCT
#endif
77
#include <windows.h>
78 79 80
/* Some versions of compiler define MEMORYSTATUSEX, some don't, so we
   use a different name to avoid compilation problems.  */
typedef struct _MEMORY_STATUS_EX {
81 82 83 84 85 86 87 88 89
        DWORD dwLength;
        DWORD dwMemoryLoad;
        DWORDLONG ullTotalPhys;
        DWORDLONG ullAvailPhys;
        DWORDLONG ullTotalPageFile;
        DWORDLONG ullAvailPageFile;
        DWORDLONG ullTotalVirtual;
        DWORDLONG ullAvailVirtual;
        DWORDLONG ullAvailExtendedVirtual;
90
} MEMORY_STATUS_EX,*LPMEMORY_STATUS_EX;
91

92
#include <lmcons.h>
93
#include <shlobj.h>
94

95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112
#include <tlhelp32.h>
#include <psapi.h>
/* This either is not in psapi.h or guarded by higher value of
   _WIN32_WINNT than what we use.  */
typedef struct _PROCESS_MEMORY_COUNTERS_EX {
	DWORD cb;
	DWORD PageFaultCount;
	DWORD PeakWorkingSetSize;
	DWORD WorkingSetSize;
	DWORD QuotaPeakPagedPoolUsage;
	DWORD QuotaPagedPoolUsage;
	DWORD QuotaPeakNonPagedPoolUsage;
	DWORD QuotaNonPagedPoolUsage;
	DWORD PagefileUsage;
	DWORD PeakPagefileUsage;
	DWORD PrivateUsage;
} PROCESS_MEMORY_COUNTERS_EX,*PPROCESS_MEMORY_COUNTERS_EX;

113 114 115 116 117 118 119 120 121 122 123
#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
124
#undef getpeername
Geoff Voelker's avatar
Geoff Voelker committed
125
#undef shutdown
126 127 128 129 130 131
#undef setsockopt
#undef listen
#undef getsockname
#undef accept
#undef recvfrom
#undef sendto
132
#endif
133

Geoff Voelker's avatar
Geoff Voelker committed
134
#include "w32.h"
135
#include "ndir.h"
Geoff Voelker's avatar
Geoff Voelker committed
136
#include "w32heap.h"
137
#include "systime.h"
Eli Zaretskii's avatar
Eli Zaretskii committed
138
#include "dispextern.h"		/* for xstrcasecmp */
139
#include "coding.h"		/* for Vlocale_coding_system */
140

Glenn Morris's avatar
Glenn Morris committed
141
/* For serial_configure and serial_open.  */
142 143
#include "process.h"

144 145 146
typedef HRESULT (WINAPI * ShGetFolderPath_fn)
  (IN HWND, IN int, IN HANDLE, IN DWORD, OUT char *);

147
void globals_of_w32 (void);
148
static DWORD get_rid (PSID);
149

Geoff Voelker's avatar
Geoff Voelker committed
150 151 152
extern Lisp_Object Vw32_downcase_file_names;
extern Lisp_Object Vw32_generate_fake_inodes;
extern Lisp_Object Vw32_get_true_file_attributes;
153 154 155
/* Defined in process.c for its own purpose.  */
extern Lisp_Object Qlocal;

156
extern int w32_num_mouse_buttons;
Geoff Voelker's avatar
Geoff Voelker committed
157

158

159 160 161 162 163 164 165 166 167
/* Initialization states.

   WARNING: If you add any more such variables for additional APIs,
            you MUST add initialization for them to globals_of_w32
            below.  This is because these variables might get set
            to non-NULL values during dumping, but the dumped Emacs
            cannot reuse those values, because it could be run on a
            different version of the OS, where API addresses are
            different.  */
168 169 170 171 172
static BOOL g_b_init_is_windows_9x;
static BOOL g_b_init_open_process_token;
static BOOL g_b_init_get_token_information;
static BOOL g_b_init_lookup_account_sid;
static BOOL g_b_init_get_sid_identifier_authority;
173 174
static BOOL g_b_init_get_sid_sub_authority;
static BOOL g_b_init_get_sid_sub_authority_count;
175 176 177 178
static BOOL g_b_init_get_file_security;
static BOOL g_b_init_get_security_descriptor_owner;
static BOOL g_b_init_get_security_descriptor_group;
static BOOL g_b_init_is_valid_sid;
179 180 181 182 183 184 185 186 187 188
static BOOL g_b_init_create_toolhelp32_snapshot;
static BOOL g_b_init_process32_first;
static BOOL g_b_init_process32_next;
static BOOL g_b_init_open_thread_token;
static BOOL g_b_init_impersonate_self;
static BOOL g_b_init_revert_to_self;
static BOOL g_b_init_get_process_memory_info;
static BOOL g_b_init_get_process_working_set_size;
static BOOL g_b_init_global_memory_status;
static BOOL g_b_init_global_memory_status_ex;
189 190 191
static BOOL g_b_init_get_length_sid;
static BOOL g_b_init_equal_sid;
static BOOL g_b_init_copy_sid;
192 193
static BOOL g_b_init_get_native_system_info;
static BOOL g_b_init_get_system_times;
194

195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210
/*
  BEGIN: Wrapper functions around OpenProcessToken
  and other functions in advapi32.dll that are only
  supported in Windows NT / 2k / XP
*/
  /* ** Function pointer typedefs ** */
typedef BOOL (WINAPI * OpenProcessToken_Proc) (
    HANDLE ProcessHandle,
    DWORD DesiredAccess,
    PHANDLE TokenHandle);
typedef BOOL (WINAPI * GetTokenInformation_Proc) (
    HANDLE TokenHandle,
    TOKEN_INFORMATION_CLASS TokenInformationClass,
    LPVOID TokenInformation,
    DWORD TokenInformationLength,
    PDWORD ReturnLength);
211 212 213 214 215 216 217 218 219
typedef BOOL (WINAPI * GetProcessTimes_Proc) (
    HANDLE process_handle,
    LPFILETIME creation_time,
    LPFILETIME exit_time,
    LPFILETIME kernel_time,
    LPFILETIME user_time);

GetProcessTimes_Proc get_process_times_fn = NULL;

220 221
#ifdef _UNICODE
const char * const LookupAccountSid_Name = "LookupAccountSidW";
222
const char * const GetFileSecurity_Name =  "GetFileSecurityW";
223 224
#else
const char * const LookupAccountSid_Name = "LookupAccountSidA";
225
const char * const GetFileSecurity_Name =  "GetFileSecurityA";
226 227 228 229 230 231 232 233 234 235 236
#endif
typedef BOOL (WINAPI * LookupAccountSid_Proc) (
    LPCTSTR lpSystemName,
    PSID Sid,
    LPTSTR Name,
    LPDWORD cbName,
    LPTSTR DomainName,
    LPDWORD cbDomainName,
    PSID_NAME_USE peUse);
typedef PSID_IDENTIFIER_AUTHORITY (WINAPI * GetSidIdentifierAuthority_Proc) (
    PSID pSid);
237 238 239 240 241
typedef PDWORD (WINAPI * GetSidSubAuthority_Proc) (
    PSID pSid,
    DWORD n);
typedef PUCHAR (WINAPI * GetSidSubAuthorityCount_Proc) (
    PSID pSid);
242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257
typedef BOOL (WINAPI * GetFileSecurity_Proc) (
    LPCTSTR lpFileName,
    SECURITY_INFORMATION RequestedInformation,
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    DWORD nLength,
    LPDWORD lpnLengthNeeded);
typedef BOOL (WINAPI * GetSecurityDescriptorOwner_Proc) (
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    PSID *pOwner,
    LPBOOL lpbOwnerDefaulted);
typedef BOOL (WINAPI * GetSecurityDescriptorGroup_Proc) (
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    PSID *pGroup,
    LPBOOL lpbGroupDefaulted);
typedef BOOL (WINAPI * IsValidSid_Proc) (
    PSID sid);
258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285
typedef HANDLE (WINAPI * CreateToolhelp32Snapshot_Proc) (
    DWORD dwFlags,
    DWORD th32ProcessID);
typedef BOOL (WINAPI * Process32First_Proc) (
    HANDLE hSnapshot,
    LPPROCESSENTRY32 lppe);
typedef BOOL (WINAPI * Process32Next_Proc) (
    HANDLE hSnapshot,
    LPPROCESSENTRY32 lppe);
typedef BOOL (WINAPI * OpenThreadToken_Proc) (
    HANDLE ThreadHandle,
    DWORD DesiredAccess,
    BOOL OpenAsSelf,
    PHANDLE TokenHandle);
typedef BOOL (WINAPI * ImpersonateSelf_Proc) (
    SECURITY_IMPERSONATION_LEVEL ImpersonationLevel);
typedef BOOL (WINAPI * RevertToSelf_Proc) (void);
typedef BOOL (WINAPI * GetProcessMemoryInfo_Proc) (
    HANDLE Process,
    PPROCESS_MEMORY_COUNTERS ppsmemCounters,
    DWORD cb);
typedef BOOL (WINAPI * GetProcessWorkingSetSize_Proc) (
    HANDLE hProcess,
    DWORD * lpMinimumWorkingSetSize,
    DWORD * lpMaximumWorkingSetSize);
typedef BOOL (WINAPI * GlobalMemoryStatus_Proc) (
    LPMEMORYSTATUS lpBuffer);
typedef BOOL (WINAPI * GlobalMemoryStatusEx_Proc) (
286
    LPMEMORY_STATUS_EX lpBuffer);
287 288 289 290 291 292 293 294 295
typedef BOOL (WINAPI * CopySid_Proc) (
    DWORD nDestinationSidLength,
    PSID pDestinationSid,
    PSID pSourceSid);
typedef BOOL (WINAPI * EqualSid_Proc) (
    PSID pSid1,
    PSID pSid2);
typedef DWORD (WINAPI * GetLengthSid_Proc) (
    PSID pSid);
296 297 298 299 300 301
typedef void (WINAPI * GetNativeSystemInfo_Proc) (
    LPSYSTEM_INFO lpSystemInfo);
typedef BOOL (WINAPI * GetSystemTimes_Proc) (
    LPFILETIME lpIdleTime,
    LPFILETIME lpKernelTime,
    LPFILETIME lpUserTime);
302 303


304 305

  /* ** A utility function ** */
Kim F. Storm's avatar
Kim F. Storm committed
306
static BOOL
307
is_windows_9x (void)
308
{
309
  static BOOL s_b_ret=0;
310
  OSVERSIONINFO os_ver;
311
  if (g_b_init_is_windows_9x == 0)
312
    {
313
      g_b_init_is_windows_9x = 1;
314 315
      ZeroMemory (&os_ver, sizeof (OSVERSIONINFO));
      os_ver.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
316 317 318 319
      if (GetVersionEx (&os_ver))
        {
          s_b_ret = (os_ver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS);
        }
320
    }
321
  return s_b_ret;
322 323
}

324 325 326 327
/* Get total user and system times for get-internal-run-time.
   Returns a list of three integers if the times are provided by the OS
   (NT derivatives), otherwise it returns the result of current-time. */
Lisp_Object
328
w32_get_internal_run_time (void)
329 330 331 332
{
  if (get_process_times_fn)
    {
      FILETIME create, exit, kernel, user;
333
      HANDLE proc = GetCurrentProcess ();
334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363
      if ((*get_process_times_fn) (proc, &create, &exit, &kernel, &user))
        {
          LARGE_INTEGER user_int, kernel_int, total;
          int microseconds;
          user_int.LowPart = user.dwLowDateTime;
          user_int.HighPart = user.dwHighDateTime;
          kernel_int.LowPart = kernel.dwLowDateTime;
          kernel_int.HighPart = kernel.dwHighDateTime;
          total.QuadPart = user_int.QuadPart + kernel_int.QuadPart;
          /* FILETIME is 100 nanosecond increments, Emacs only wants
             microsecond resolution.  */
          total.QuadPart /= 10;
          microseconds = total.QuadPart % 1000000;
          total.QuadPart /= 1000000;

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

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

  return Fcurrent_time ();
}

364 365 366 367 368 369 370
  /* ** The wrapper functions ** */

BOOL WINAPI open_process_token (
    HANDLE ProcessHandle,
    DWORD DesiredAccess,
    PHANDLE TokenHandle)
{
371
  static OpenProcessToken_Proc s_pfn_Open_Process_Token = NULL;
372 373 374 375 376
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
377 378 379 380 381 382 383 384
  if (g_b_init_open_process_token == 0)
    {
      g_b_init_open_process_token = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Open_Process_Token =
        (OpenProcessToken_Proc) GetProcAddress (hm_advapi32, "OpenProcessToken");
    }
  if (s_pfn_Open_Process_Token == NULL)
385 386 387 388
    {
      return FALSE;
    }
  return (
389
      s_pfn_Open_Process_Token (
390 391 392 393 394 395 396 397 398 399 400 401 402
          ProcessHandle,
          DesiredAccess,
          TokenHandle)
      );
}

BOOL WINAPI get_token_information (
    HANDLE TokenHandle,
    TOKEN_INFORMATION_CLASS TokenInformationClass,
    LPVOID TokenInformation,
    DWORD TokenInformationLength,
    PDWORD ReturnLength)
{
403
  static GetTokenInformation_Proc s_pfn_Get_Token_Information = NULL;
404 405 406 407 408
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
409 410 411 412 413 414 415 416
  if (g_b_init_get_token_information == 0)
    {
      g_b_init_get_token_information = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Token_Information =
        (GetTokenInformation_Proc) GetProcAddress (hm_advapi32, "GetTokenInformation");
    }
  if (s_pfn_Get_Token_Information == NULL)
417 418 419 420
    {
      return FALSE;
    }
  return (
421
      s_pfn_Get_Token_Information (
422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438
          TokenHandle,
          TokenInformationClass,
          TokenInformation,
          TokenInformationLength,
          ReturnLength)
      );
}

BOOL WINAPI lookup_account_sid (
    LPCTSTR lpSystemName,
    PSID Sid,
    LPTSTR Name,
    LPDWORD cbName,
    LPTSTR DomainName,
    LPDWORD cbDomainName,
    PSID_NAME_USE peUse)
{
439
  static LookupAccountSid_Proc s_pfn_Lookup_Account_Sid = NULL;
440 441 442 443 444
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
445 446 447 448 449 450 451 452
  if (g_b_init_lookup_account_sid == 0)
    {
      g_b_init_lookup_account_sid = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Lookup_Account_Sid =
        (LookupAccountSid_Proc) GetProcAddress (hm_advapi32, LookupAccountSid_Name);
    }
  if (s_pfn_Lookup_Account_Sid == NULL)
453 454 455 456
    {
      return FALSE;
    }
  return (
457
      s_pfn_Lookup_Account_Sid (
458 459 460 461 462 463 464 465 466 467 468 469 470
          lpSystemName,
          Sid,
          Name,
          cbName,
          DomainName,
          cbDomainName,
          peUse)
      );
}

PSID_IDENTIFIER_AUTHORITY WINAPI get_sid_identifier_authority (
    PSID pSid)
{
471
  static GetSidIdentifierAuthority_Proc s_pfn_Get_Sid_Identifier_Authority = NULL;
472 473 474 475 476
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return NULL;
    }
477 478 479 480 481 482 483 484 485
  if (g_b_init_get_sid_identifier_authority == 0)
    {
      g_b_init_get_sid_identifier_authority = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Sid_Identifier_Authority =
        (GetSidIdentifierAuthority_Proc) GetProcAddress (
            hm_advapi32, "GetSidIdentifierAuthority");
    }
  if (s_pfn_Get_Sid_Identifier_Authority == NULL)
486 487 488
    {
      return NULL;
    }
489
  return (s_pfn_Get_Sid_Identifier_Authority (pSid));
490 491
}

492 493 494 495 496
PDWORD WINAPI get_sid_sub_authority (
    PSID pSid,
    DWORD n)
{
  static GetSidSubAuthority_Proc s_pfn_Get_Sid_Sub_Authority = NULL;
497
  static DWORD zero = 0U;
498 499 500
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
501
      return &zero;
502 503 504 505 506 507 508 509 510 511 512
    }
  if (g_b_init_get_sid_sub_authority == 0)
    {
      g_b_init_get_sid_sub_authority = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Sid_Sub_Authority =
        (GetSidSubAuthority_Proc) GetProcAddress (
            hm_advapi32, "GetSidSubAuthority");
    }
  if (s_pfn_Get_Sid_Sub_Authority == NULL)
    {
513
      return &zero;
514 515 516 517 518 519 520 521
    }
  return (s_pfn_Get_Sid_Sub_Authority (pSid, n));
}

PUCHAR WINAPI get_sid_sub_authority_count (
    PSID pSid)
{
  static GetSidSubAuthorityCount_Proc s_pfn_Get_Sid_Sub_Authority_Count = NULL;
522
  static UCHAR zero = 0U;
523 524 525
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
526
      return &zero;
527 528 529 530 531 532 533 534 535 536 537
    }
  if (g_b_init_get_sid_sub_authority_count == 0)
    {
      g_b_init_get_sid_sub_authority_count = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Sid_Sub_Authority_Count =
        (GetSidSubAuthorityCount_Proc) GetProcAddress (
            hm_advapi32, "GetSidSubAuthorityCount");
    }
  if (s_pfn_Get_Sid_Sub_Authority_Count == NULL)
    {
538
      return &zero;
539 540 541 542
    }
  return (s_pfn_Get_Sid_Sub_Authority_Count (pSid));
}

543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650
BOOL WINAPI get_file_security (
    LPCTSTR lpFileName,
    SECURITY_INFORMATION RequestedInformation,
    PSECURITY_DESCRIPTOR pSecurityDescriptor,
    DWORD nLength,
    LPDWORD lpnLengthNeeded)
{
  static GetFileSecurity_Proc s_pfn_Get_File_Security = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
  if (g_b_init_get_file_security == 0)
    {
      g_b_init_get_file_security = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_File_Security =
        (GetFileSecurity_Proc) GetProcAddress (
            hm_advapi32, GetFileSecurity_Name);
    }
  if (s_pfn_Get_File_Security == NULL)
    {
      return FALSE;
    }
  return (s_pfn_Get_File_Security (lpFileName, RequestedInformation,
				   pSecurityDescriptor, nLength,
				   lpnLengthNeeded));
}

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

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

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

651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
BOOL WINAPI equal_sid (
    PSID sid1,
    PSID sid2)
{
  static EqualSid_Proc s_pfn_Equal_Sid = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
  if (g_b_init_equal_sid == 0)
    {
      g_b_init_equal_sid = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Equal_Sid =
        (EqualSid_Proc) GetProcAddress (
            hm_advapi32, "EqualSid");
    }
  if (s_pfn_Equal_Sid == NULL)
    {
      return FALSE;
    }
  return (s_pfn_Equal_Sid (sid1, sid2));
}

DWORD WINAPI get_length_sid (
    PSID sid)
{
  static GetLengthSid_Proc s_pfn_Get_Length_Sid = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return 0;
    }
  if (g_b_init_get_length_sid == 0)
    {
      g_b_init_get_length_sid = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Get_Length_Sid =
        (GetLengthSid_Proc) GetProcAddress (
            hm_advapi32, "GetLengthSid");
    }
  if (s_pfn_Get_Length_Sid == NULL)
    {
      return 0;
    }
  return (s_pfn_Get_Length_Sid (sid));
}

BOOL WINAPI copy_sid (
    DWORD destlen,
    PSID dest,
    PSID src)
{
  static CopySid_Proc s_pfn_Copy_Sid = NULL;
  HMODULE hm_advapi32 = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
  if (g_b_init_copy_sid == 0)
    {
      g_b_init_copy_sid = 1;
      hm_advapi32 = LoadLibrary ("Advapi32.dll");
      s_pfn_Copy_Sid =
        (CopySid_Proc) GetProcAddress (
            hm_advapi32, "CopySid");
    }
  if (s_pfn_Copy_Sid == NULL)
    {
      return FALSE;
    }
  return (s_pfn_Copy_Sid (destlen, dest, src));
}

726 727 728 729 730 731
/*
  END: Wrapper functions around OpenProcessToken
  and other functions in advapi32.dll that are only
  supported in Windows NT / 2k / XP
*/

732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751
void WINAPI get_native_system_info (
    LPSYSTEM_INFO lpSystemInfo)
{
  static GetNativeSystemInfo_Proc s_pfn_Get_Native_System_Info = NULL;
  if (is_windows_9x () != TRUE)
    {
      if (g_b_init_get_native_system_info == 0)
	{
	  g_b_init_get_native_system_info = 1;
	  s_pfn_Get_Native_System_Info =
	    (GetNativeSystemInfo_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
						      "GetNativeSystemInfo");
	}
      if (s_pfn_Get_Native_System_Info != NULL)
	s_pfn_Get_Native_System_Info (lpSystemInfo);
    }
  else
    lpSystemInfo->dwNumberOfProcessors = -1;
}

752
BOOL WINAPI get_system_times (
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772
    LPFILETIME lpIdleTime,
    LPFILETIME lpKernelTime,
    LPFILETIME lpUserTime)
{
  static GetSystemTimes_Proc s_pfn_Get_System_times = NULL;
  if (is_windows_9x () == TRUE)
    {
      return FALSE;
    }
  if (g_b_init_get_system_times == 0)
    {
      g_b_init_get_system_times = 1;
      s_pfn_Get_System_times =
	(GetSystemTimes_Proc)GetProcAddress (GetModuleHandle ("kernel32.dll"),
					     "GetSystemTimes");
    }
  if (s_pfn_Get_System_times == NULL)
    return FALSE;
  return (s_pfn_Get_System_times (lpIdleTime, lpKernelTime, lpUserTime));
}
Andrew Innes's avatar
Andrew Innes committed
773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791

/* Equivalent of strerror for W32 error codes.  */
char *
w32_strerror (int error_no)
{
  static char buf[500];

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

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

792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813
/* Return 1 if P is a valid pointer to an object of size SIZE.  Return
   0 if P is NOT a valid pointer.  Return -1 if we cannot validate P.

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

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

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

Geoff Voelker's avatar
Geoff Voelker committed
814
static char startup_dir[MAXPATHLEN];
815

Richard M. Stallman's avatar
Richard M. Stallman committed
816
/* Get the current working directory.  */
817
char *
Richard M. Stallman's avatar
Richard M. Stallman committed
818 819
getwd (char *dir)
{
Geoff Voelker's avatar
Geoff Voelker committed
820
#if 0
821 822 823
  if (GetCurrentDirectory (MAXPATHLEN, dir) > 0)
    return dir;
  return NULL;
Geoff Voelker's avatar
Geoff Voelker committed
824 825 826 827 828 829 830
#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
Richard M. Stallman's avatar
Richard M. Stallman committed
831 832
}

833
#ifndef HAVE_SOCKETS
Richard M. Stallman's avatar
Richard M. Stallman committed
834 835 836 837
/* Emulate gethostname.  */
int
gethostname (char *buffer, int size)
{
838
  /* NT only allows small host names, so the buffer is
Richard M. Stallman's avatar
Richard M. Stallman committed
839 840 841
     certainly large enough.  */
  return !GetComputerName (buffer, &size);
}
842
#endif /* HAVE_SOCKETS */
Richard M. Stallman's avatar
Richard M. Stallman committed
843 844

/* Emulate getloadavg.  */
845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961

struct load_sample {
  time_t sample_time;
  ULONGLONG idle;
  ULONGLONG kernel;
  ULONGLONG user;
};

/* Number of processors on this machine.  */
static unsigned num_of_processors;

/* We maintain 1-sec samples for the last 16 minutes in a circular buffer.  */
static struct load_sample samples[16*60];
static int first_idx = -1, last_idx = -1;
static int max_idx = sizeof (samples) / sizeof (samples[0]);

static int
buf_next (int from)
{
  int next_idx = from + 1;

  if (next_idx >= max_idx)
    next_idx = 0;

  return next_idx;
}

static int
buf_prev (int from)
{
  int prev_idx = from - 1;

  if (prev_idx < 0)
    prev_idx = max_idx - 1;

  return prev_idx;
}

static void
sample_system_load (ULONGLONG *idle, ULONGLONG *kernel, ULONGLONG *user)
{
  SYSTEM_INFO sysinfo;
  FILETIME ft_idle, ft_user, ft_kernel;

  /* Initialize the number of processors on this machine.  */
  if (num_of_processors <= 0)
    {
      get_native_system_info (&sysinfo);
      num_of_processors = sysinfo.dwNumberOfProcessors;
      if (num_of_processors <= 0)
	{
	  GetSystemInfo (&sysinfo);
	  num_of_processors = sysinfo.dwNumberOfProcessors;
	}
      if (num_of_processors <= 0)
	num_of_processors = 1;
    }

  /* TODO: Take into account threads that are ready to run, by
     sampling the "\System\Processor Queue Length" performance
     counter.  The code below accounts only for threads that are
     actually running.  */

  if (get_system_times (&ft_idle, &ft_kernel, &ft_user))
    {
      ULARGE_INTEGER uidle, ukernel, uuser;

      memcpy (&uidle, &ft_idle, sizeof (ft_idle));
      memcpy (&ukernel, &ft_kernel, sizeof (ft_kernel));
      memcpy (&uuser, &ft_user, sizeof (ft_user));
      *idle = uidle.QuadPart;
      *kernel = ukernel.QuadPart;
      *user = uuser.QuadPart;
    }
  else
    {
      *idle = 0;
      *kernel = 0;
      *user = 0;
    }
}

/* Produce the load average for a given time interval, using the
   samples in the samples[] array.  WHICH can be 0, 1, or 2, meaning
   1-minute, 5-minute, or 15-minute average, respectively. */
static double
getavg (int which)
{
  double retval = -1.0;
  double tdiff;
  int idx;
  double span = (which == 0 ? 1.0 : (which == 1 ? 5.0 : 15.0)) * 60;
  time_t now = samples[last_idx].sample_time;

  if (first_idx != last_idx)
    {
      for (idx = buf_prev (last_idx); ; idx = buf_prev (idx))
	{
	  tdiff = difftime (now, samples[idx].sample_time);
	  if (tdiff >= span - 2*DBL_EPSILON*now)
	    {
	      long double sys =
		samples[last_idx].kernel + samples[last_idx].user
		- (samples[idx].kernel + samples[idx].user);
	      long double idl = samples[last_idx].idle - samples[idx].idle;

	      retval = (1.0 - idl / sys) * num_of_processors;
	      break;
	    }
	  if (idx == first_idx)
	    break;
	}
    }

  return retval;
}

Richard M. Stallman's avatar
Richard M. Stallman committed
962 963 964
int
getloadavg (double loadavg[], int nelem)
{
965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987
  int elem;
  ULONGLONG idle, kernel, user;
  time_t now = time (NULL);

  /* Store another sample.  We ignore samples that are less than 1 sec
     apart.  */
  if (difftime (now, samples[last_idx].sample_time) >= 1.0 - 2*DBL_EPSILON*now)
    {
      sample_system_load (&idle, &kernel, &user);
      last_idx = buf_next (last_idx);
      samples[last_idx].sample_time = now;
      samples[last_idx].idle = idle;
      samples[last_idx].kernel = kernel;
      samples[last_idx].user = user;
      /* If the buffer has more that 15 min worth of samples, discard
	 the old ones.  */
      if (first_idx == -1)
	first_idx = last_idx;
      while (first_idx != last_idx
	     && (difftime (now, samples[first_idx].sample_time)
	         >= 15.0*60 + 2*DBL_EPSILON*now))
	first_idx = buf_next (first_idx);
    }
Richard M. Stallman's avatar
Richard M. Stallman committed
988

989
  for (elem = 0; elem < nelem; elem++)
Richard M. Stallman's avatar
Richard M. Stallman committed
990
    {
991 992 993 994 995
      double avg = getavg (elem);

      if (avg < 0)
	break;
      loadavg[elem] = avg;
Richard M. Stallman's avatar
Richard M. Stallman committed
996
    }
997 998

  return elem;
Richard M. Stallman's avatar
Richard M. Stallman committed
999 1000
}

1001
/* Emulate getpwuid, getpwnam and others.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
1002

Geoff Voelker's avatar
Geoff Voelker committed
1003 1004
#define PASSWD_FIELD_SIZE 256

1005 1006 1007 1008 1009
static char dflt_passwd_name[PASSWD_FIELD_SIZE];
static char dflt_passwd_passwd[PASSWD_FIELD_SIZE];
static char dflt_passwd_gecos[PASSWD_FIELD_SIZE];
static char dflt_passwd_dir[PASSWD_FIELD_SIZE];
static char dflt_passwd_shell[PASSWD_FIELD_SIZE];
Richard M. Stallman's avatar
Richard M. Stallman committed
1010

1011
static struct passwd dflt_passwd =
Richard M. Stallman's avatar
Richard M. Stallman committed
1012
{
1013 1014
  dflt_passwd_name,
  dflt_passwd_passwd,
Richard M. Stallman's avatar
Richard M. Stallman committed
1015 1016 1017
  0,
  0,
  0,
1018 1019 1020
  dflt_passwd_gecos,
  dflt_passwd_dir,
  dflt_passwd_shell,
Richard M. Stallman's avatar
Richard M. Stallman committed
1021 1022
};

1023 1024 1025
static char dflt_group_name[GNLEN+1];

static struct group dflt_group =
Lars Hansen's avatar
Lars Hansen committed
1026
{
1027 1028 1029 1030
  /* When group information is not available, we return this as the
     group for all files.  */
  dflt_group_name,
  0,
Lars Hansen's avatar
Lars Hansen committed
1031 1032
};

1033
unsigned
1034
getuid (void)
1035
{
1036
  return dflt_passwd.pw_uid;
1037 1038
}

1039
unsigned
1040
geteuid (void)
1041
{
1042 1043 1044
  /* 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.  */
1045
  return getuid ();
1046 1047
}

1048
unsigned
1049
getgid (void)
1050
{
1051
  return dflt_passwd.pw_gid;
1052 1053
}

1054
unsigned
1055
getegid (void)
1056
{
1057 1058 1059
  return getgid ();
}

Richard M. Stallman's avatar
Richard M. Stallman committed
1060
struct passwd *
1061
getpwuid (unsigned uid)
Richard M. Stallman's avatar
Richard M. Stallman committed
1062
{
1063 1064
  if (uid == dflt_passwd.pw_uid)
    return &dflt_passwd;
1065
  return NULL;
Richard M. Stallman's avatar
Richard M. Stallman committed
1066 1067
}

Lars Hansen's avatar
Lars Hansen committed
1068 1069 1070
struct group *
getgrgid (gid_t gid)
{
1071
  return &dflt_group;
Lars Hansen's avatar
Lars Hansen committed
1072 1073
}

Richard M. Stallman's avatar
Richard M. Stallman committed
1074 1075 1076 1077
struct passwd *
getpwnam (char *name)
{
  struct passwd *pw;
1078

Richard M. Stallman's avatar
Richard M. Stallman committed
1079 1080 1081 1082
  pw = getpwuid (getuid ());
  if (!pw)
    return pw;

1083
  if (xstrcasecmp (name, pw->pw_name))
Richard M. Stallman's avatar
Richard M. Stallman committed
1084 1085 1086 1087 1088
    return NULL;

  return pw;
}

1089
void
1090
init_user_info (void)
Richard M. Stallman's avatar
Richard M. Stallman committed
1091
{
1092 1093 1094 1095 1096 1097 1098
  /* 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). */

1099
  char         uname[UNLEN+1], gname[GNLEN+1], domain[1025];
1100
  DWORD        ulength = sizeof (uname), dlength = sizeof (domain), needed;
1101
  DWORD	       glength = sizeof (gname);
1102 1103
  HANDLE       token = NULL;
  SID_NAME_USE user_type;
1104 1105
  unsigned char *buf = NULL;
  DWORD        blen = 0;
1106 1107
  TOKEN_USER   user_token;
  TOKEN_PRIMARY_GROUP group_token;
1108
  BOOL         result;
1109

1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130
  result = open_process_token (GetCurrentProcess (), TOKEN_QUERY, &token);
  if (result)
    {
      result = get_token_information (token, TokenUser, NULL, 0, &blen);
      if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
	{
	  buf = xmalloc (blen);
	  result = get_token_information (token, TokenUser,
					  (LPVOID)buf, blen, &needed);
	  if (result)
	    {
	      memcpy (&user_token, buf, sizeof (user_token));
	      result = lookup_account_sid (NULL, user_token.User.Sid,
					   uname, &ulength,
					   domain, &dlength, &user_type);
	    }
	}
      else
	result = FALSE;
    }
  if (result)
Richard M. Stallman's avatar
Richard M. Stallman committed
1131
    {
1132
      strcpy (dflt_passwd.pw_name, uname);
1133
      /* Determine a reasonable uid value.  */
1134
      if (xstrcasecmp ("administrator", uname) == 0)
1135
	{
1136 1137
	  dflt_passwd.pw_uid = 500; /* well-known Administrator uid */
	  dflt_passwd.pw_gid = 513; /* well-known None gid */
1138 1139 1140
	}
      else
	{
1141 1142
	  /* Use the last sub-authority value of the RID, the relative
	     portion of the SID, as user/group ID. */
1143
	  dflt_passwd.pw_uid = get_rid (user_token.User.Sid);
1144

1145
	  /* Get group id and name.  */
1146 1147 1148 1149 1150 1151 1152 1153 1154
	  result = get_token_information (token, TokenPrimaryGroup,
					  (LPVOID)buf, blen, &needed);
	  if (!result && GetLastError () == ERROR_INSUFFICIENT_BUFFER)
	    {
	      buf = xrealloc (buf, blen = needed);
	      result = get_token_information (token, TokenPrimaryGroup,
					      (LPVOID)buf, blen, &needed);
	    }
	  if (result)
1155
	    {
1156
	      memcpy (&group_token, buf, sizeof (group_token));
1157
	      dflt_passwd.pw_gid = get_rid (group_token.PrimaryGroup);
1158
	      dlength = sizeof (domain);
1159 1160 1161
	      /* If we can get at the real Primary Group name, use that.
		 Otherwise, the default group name was already set to
		 "None" in globals_of_w32.  */
1162 1163 1164 1165
	      if (lookup_account_sid (NULL, group_token.PrimaryGroup,
				      gname, &glength, NULL, &dlength,
				      &user_type))
		strcpy (dflt_group_name, gname);
1166 1167
	    }
	  else
1168
	    dflt_passwd.pw_gid = dflt_passwd.pw_uid;
1169 1170 1171
	}
    }
  /* If security calls are not supported (presumably because we
1172
     are running under Windows 9X), fallback to this: */
1173
  else if (GetUserName (uname, &ulength))
1174
    {
1175
      strcpy (dflt_passwd.pw_name, uname);
1176
      if (xstrcasecmp ("administrator", uname) == 0)
1177
	dflt_passwd.pw_uid = 0;
1178
      else
1179 1180
	dflt_passwd.pw_uid = 123;
      dflt_passwd.pw_gid = dflt_passwd.pw_uid;
1181 1182 1183
    }
  else
    {
1184 1185 1186
      strcpy (dflt_passwd.pw_name, "unknown");
      dflt_passwd.pw_uid = 123;
      dflt_passwd.pw_gid = 123;
Richard M. Stallman's avatar
Richard M. Stallman committed
1187
    }
1188
  dflt_group.gr_gid = dflt_passwd.pw_gid;
Richard M. Stallman's avatar
Richard M. Stallman committed
1189

1190 1191
  /* Ensure HOME and SHELL are defined. */
  if (getenv ("HOME") == NULL)
1192
    abort ();
1193
  if (getenv ("SHELL") == NULL)
1194
    abort ();
Richard M. Stallman's avatar
Richard M. Stallman committed
1195

1196
  /* Set dir and shell from environment variables. */
1197 1198
  strcpy (dflt_passwd.pw_dir, getenv ("HOME"));
  strcpy (dflt_passwd.pw_shell, getenv ("SHELL"));
1199

1200
  xfree (buf);
1201 1202
  if (token)
    CloseHandle (token);
Richard M. Stallman's avatar
Richard M. Stallman committed
1203 1204 1205
}

int
1206
random (void)
Richard M. Stallman's avatar
Richard M. Stallman committed
1207
{
1208 1209
  /* rand () on NT gives us 15 random bits...hack together 30 bits.  */
  return ((rand () << 15) | rand ());
Richard M. Stallman's avatar
Richard M. Stallman committed
1210 1211 1212
}

void
1213
srandom (int seed)
Richard M. Stallman's avatar
Richard M. Stallman committed
1214
{
1215
  srand (seed);
Richard M. Stallman's avatar
Richard M. Stallman committed
1216 1217
}

Geoff Voelker's avatar
Geoff Voelker committed
1218

1219 1220 1221 1222 1223
/* Normalize filename by converting all path separators to
   the specified separator.  Also conditionally convert upper
   case path name components to lower case.  */

static void
1224
normalize_filename (register char *fp, char path_sep)
1225 1226 1227 1228
{
  char sep;
  char *elem;

1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
  /* 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;
    }

1240
  if (NILP (Vw32_downcase_file_names))
1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277
    {
      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++);
}

1278
/* Destructively turn backslashes into slashes.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
1279
void
1280
dostounix_filename (register char *p)
Richard M. Stallman's avatar
Richard M. Stallman committed
1281
{
1282
  normalize_filename (p, '/');
Richard M. Stallman's avatar
Richard M. Stallman committed
1283 1284
}

1285
/* Destructively turn slashes into backslashes.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
1286
void
1287
unixtodos_filename (register char *p)
Richard M. Stallman's avatar
Richard M. Stallman committed
1288
{
1289
  normalize_filename (p, '\\');
Richard M. Stallman's avatar
Richard M. Stallman committed
1290 1291
}

1292 1293 1294
/* 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.)  */
Karl Heuer's avatar
Karl Heuer committed
1295
int
1296
crlf_to_lf (register int n, register unsigned char *buf)
Karl Heuer's avatar
Karl Heuer committed
1297
{
1298 1299 1300
  unsigned char *np = buf;
  unsigned char *startp = buf;
  unsigned char *endp = buf + n;
Karl Heuer's avatar
Karl Heuer committed
1301

1302 1303 1304
  if (n == 0)
    return n;
  while (buf < endp - 1)
Richard M. Stallman's avatar
Richard M. Stallman committed
1305
    {
1306 1307 1308 1309 1310 1311 1312
      if (*buf == 0x0d)
	{
	  if (*(++buf) != 0x0a)
	    *np++ = 0x0d;
	}
      else
	*np++ = *buf++;
Richard M. Stallman's avatar
Richard M. Stallman committed
1313
    }
1314 1315 1316
  if (buf < endp)
    *np++ = *buf++;
  return np - startp;
Richard M. Stallman's avatar
Richard M. Stallman committed
1317 1318
}

Geoff Voelker's avatar
Geoff Voelker committed
1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365
/* 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;

1366
  /* must be valid filename, no wild cards or other invalid characters */
1367
  if (_mbspbrk (name, "*?|<>\""))
1368 1369
    return 0;

Geoff Voelker's avatar
Geoff Voelker committed
1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387