lib-src/ntlib.c

   1 /* Utility and Unix shadow routines for GNU Emacs support programs on NT.
   2
   3 Copyright (C) 1994, 2001-2012 Free Software Foundation, Inc.
   4
   5 Author: Geoff Voelker (voelker@cs.washington.edu)
   6 Created: 10-8-94
   7
   8 This file is part of GNU Emacs.
   9
  10 GNU Emacs is free software: you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation, either version 3 of the License, or
  13 (at your option) any later version.
  14
  15 GNU Emacs is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include <windows.h>
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <time.h>
  27 #include <direct.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <errno.h>
  31 #include <ctype.h>
  32 #include <sys/timeb.h>
  33 #include <mbstring.h>
  34
  35 #include "ntlib.h"
  36
  37 struct timezone
  38 {
  39   int           tz_minuteswest; /* minutes west of Greenwich */
  40   int           tz_dsttime;     /* type of dst correction */
  41 };
  42
  43 #define MAXPATHLEN _MAX_PATH
  44
  45 /* Emulate sleep...we could have done this with a define, but that
  46    would necessitate including windows.h in the files that used it.
  47    This is much easier.  */
  48 void
  49 sleep (unsigned long seconds)
  50 {
  51   Sleep (seconds * 1000);
  52 }
  53
  54 /* Get the current working directory.  */
  55 char *
  56 getwd (char *dir)
  57 {
  58   if (GetCurrentDirectory (MAXPATHLEN, dir) > 0)
  59     return dir;
  60   return NULL;
  61 }
  62
  63 static HANDLE getppid_parent;
  64 static int    getppid_ppid;
  65
  66 int
  67 getppid (void)
  68 {
  69   char *ppid;
  70   DWORD result;
  71
  72   ppid = getenv ("EM_PARENT_PROCESS_ID");
  73   if (!ppid)
  74     {
  75       printf ("no pid.\n");
  76       return 0;
  77     }
  78   else
  79     {
  80       getppid_ppid = atoi (ppid);
  81     }
  82
  83   if (!getppid_parent)
  84     {
  85       getppid_parent = OpenProcess (SYNCHRONIZE, FALSE, atoi (ppid));
  86       if (!getppid_parent)
  87         {
  88           printf ("Failed to open handle to parent process: %d\n",
  89                  GetLastError ());
  90           exit (1);
  91         }
  92     }
  93
  94   result = WaitForSingleObject (getppid_parent, 0);
  95   switch (result)
  96     {
  97     case WAIT_TIMEOUT:
  98       /* The parent is still alive.  */
  99       return getppid_ppid;
 100     case WAIT_OBJECT_0:
 101       /* The parent is gone.  Return the pid of Unix init (1).  */
 102       return 1;
 103     case WAIT_FAILED:
 104     default:
 105       printf ("Checking parent status failed: %d\n", GetLastError ());
 106       exit (1);
 107     }
 108 }
 109
 110 char *
 111 getlogin (void)
 112 {
 113   static char user_name[256];
 114   DWORD  length = sizeof (user_name);
 115
 116   if (GetUserName (user_name, &length))
 117     return user_name;
 118   return NULL;
 119 }
 120
 121 char *
 122 cuserid (char * s)
 123 {
 124   char * name = getlogin ();
 125   if (s)
 126     return strcpy (s, name ? name : "");
 127   return name;
 128 }
 129
 130 unsigned
 131 getuid (void)
 132 {
 133   return 0;
 134 }
 135
 136 unsigned
 137 getgid (void)
 138 {
 139   return 0;
 140 }
 141
 142 unsigned
 143 getegid (void)
 144 {
 145   return 0;
 146 }
 147
 148 int
 149 setuid (unsigned uid)
 150 {
 151   return 0;
 152 }
 153
 154 int
 155 setregid (unsigned rgid, unsigned gid)
 156 {
 157   return 0;
 158 }
 159
 160 struct passwd *
 161 getpwuid (unsigned uid)
 162 {
 163   return NULL;
 164 }
 165
 166 char *
 167 getpass (const char * prompt)
 168 {
 169   static char input[256];
 170   HANDLE in;
 171   HANDLE err;
 172   DWORD  count;
 173
 174   in = GetStdHandle (STD_INPUT_HANDLE);
 175   err = GetStdHandle (STD_ERROR_HANDLE);
 176
 177   if (in == INVALID_HANDLE_VALUE || err == INVALID_HANDLE_VALUE)
 178     return NULL;
 179
 180   if (WriteFile (err, prompt, strlen (prompt), &count, NULL))
 181     {
 182       int istty = (GetFileType (in) == FILE_TYPE_CHAR);
 183       DWORD old_flags;
 184       int rc;
 185
 186       if (istty)
 187         {
 188           if (GetConsoleMode (in, &old_flags))
 189             SetConsoleMode (in, ENABLE_LINE_INPUT | ENABLE_PROCESSED_INPUT);
 190           else
 191             istty = 0;
 192         }
 193       rc = ReadFile (in, input, sizeof (input), &count, NULL);
 194       if (count >= 2 && input[count - 2] == '\r')
 195         input[count - 2] = '\0';
 196       else
 197         {
 198           char buf[256];
 199           while (ReadFile (in, buf, sizeof (buf), &count, NULL) > 0)
 200             if (count >= 2 && buf[count - 2] == '\r')
 201               break;
 202         }
 203       WriteFile (err, "\r\n", 2, &count, NULL);
 204       if (istty)
 205         SetConsoleMode (in, old_flags);
 206       if (rc)
 207         return input;
 208     }
 209
 210   return NULL;
 211 }
 212
 213 /* This is needed because lib/gettime.c calls gettimeofday, which MSVC
 214    doesn't have.  Copied from w32.c.  */
 215 void
 216 gettimeofday (struct timeval *tv, struct timezone *tz)
 217 {
 218   struct _timeb tb;
 219   _ftime (&tb);
 220
 221   tv->tv_sec = tb.time;
 222   tv->tv_usec = tb.millitm * 1000L;
 223   /* Implementation note: _ftime sometimes doesn't update the dstflag
 224      according to the new timezone when the system timezone is
 225      changed.  We could fix that by using GetSystemTime and
 226      GetTimeZoneInformation, but that doesn't seem necessary, since
 227      Emacs always calls gettimeofday with the 2nd argument NULL (see
 228      current_emacs_time).  */
 229   if (tz)
 230     {
 231       tz->tz_minuteswest = tb.timezone; /* minutes west of Greenwich  */
 232       tz->tz_dsttime = tb.dstflag;      /* type of dst correction  */
 233     }
 234 }
 235
 236 int
 237 fchown (int fd, unsigned uid, unsigned gid)
 238 {
 239   return 0;
 240 }
 241
 242 /* Place a wrapper around the MSVC version of ctime.  It returns NULL
 243    on network directories, so we handle that case here.
 244    (Ulrich Leodolter, 1/11/95).  */
 245 char *
 246 sys_ctime (const time_t *t)
 247 {
 248   char *str = (char *) ctime (t);
 249   return (str ? str : "Sun Jan 01 00:00:00 1970");
 250 }
 251
 252 FILE *
 253 sys_fopen (const char * path, const char * mode)
 254 {
 255   return fopen (path, mode);
 256 }
 257
 258 int
 259 sys_chdir (const char * path)
 260 {
 261   return _chdir (path);
 262 }
 263
 264 static FILETIME utc_base_ft;
 265 static long double utc_base;
 266 static int init = 0;
 267
 268 static time_t
 269 convert_time (FILETIME ft)
 270 {
 271   long double ret;
 272
 273   if (CompareFileTime (&ft, &utc_base_ft) < 0)
 274     return 0;
 275
 276   ret = (long double) ft.dwHighDateTime
 277     * 4096.0L * 1024.0L * 1024.0L + ft.dwLowDateTime;
 278   ret -= utc_base;
 279   return (time_t) (ret * 1e-7L);
 280 }
 281
 282 static int
 283 is_exec (const char * name)
 284 {
 285   char * p = strrchr (name, '.');
 286   return
 287     (p != NULL
 288      && (stricmp (p, ".exe") == 0 ||
 289          stricmp (p, ".com") == 0 ||
 290          stricmp (p, ".bat") == 0 ||
 291          stricmp (p, ".cmd") == 0));
 292 }
 293
 294 /* FIXME?  This is in config.nt now - is this still needed?  */
 295 #define IS_DIRECTORY_SEP(x) ((x) == '/' || (x) == '\\')
 296
 297 /* We need this because nt/inc/sys/stat.h defines struct stat that is
 298    incompatible with the MS run-time libraries.  */
 299 int
 300 stat (const char * path, struct stat * buf)
 301 {
 302   WIN32_FIND_DATA wfd;
 303   HANDLE fh;
 304   int permission;
 305   int len;
 306   int rootdir = FALSE;
 307   char *name = alloca (FILENAME_MAX);
 308
 309   if (!init)
 310     {
 311       /* Determine the delta between 1-Jan-1601 and 1-Jan-1970. */
 312       SYSTEMTIME st;
 313
 314       st.wYear = 1970;
 315       st.wMonth = 1;
 316       st.wDay = 1;
 317       st.wHour = 0;
 318       st.wMinute = 0;
 319       st.wSecond = 0;
 320       st.wMilliseconds = 0;
 321
 322       SystemTimeToFileTime (&st, &utc_base_ft);
 323       utc_base = (long double) utc_base_ft.dwHighDateTime
 324         * 4096.0L * 1024.0L * 1024.0L + utc_base_ft.dwLowDateTime;
 325       init = 1;
 326     }
 327
 328   if (path == NULL || buf == NULL || *path == '\0')
 329     {
 330       errno = EFAULT;
 331       return -1;
 332     }
 333   if (_mbspbrk (path, "*?|<>\""))
 334     {
 335       errno = ENOENT;
 336       return -1;
 337     }
 338
 339   strcpy (name, path);
 340   /* Remove trailing directory separator, unless name is the root
 341      directory of a drive in which case ensure there is a trailing
 342      separator. */
 343   len = strlen (name);
 344   rootdir = IS_DIRECTORY_SEP (name[0])
 345     || (len == 3 && name[1] == ':' && IS_DIRECTORY_SEP (name[2]));
 346   if (rootdir)
 347     {
 348       if (GetDriveType (name) < 2)
 349         {
 350           errno = ENOENT;
 351           return -1;
 352         }
 353       memset (&wfd, 0, sizeof (wfd));
 354       wfd.dwFileAttributes = FILE_ATTRIBUTE_DIRECTORY;
 355       wfd.ftCreationTime = utc_base_ft;
 356       wfd.ftLastAccessTime = utc_base_ft;
 357       wfd.ftLastWriteTime = utc_base_ft;
 358       strcpy (wfd.cFileName, name);
 359     }
 360   else
 361     {
 362       if (IS_DIRECTORY_SEP (name[len-1]))
 363         name[len - 1] = 0;
 364
 365       fh = FindFirstFile (name, &wfd);
 366       if (fh == INVALID_HANDLE_VALUE)
 367         {
 368           errno = ENOENT;
 369           return -1;
 370         }
 371       FindClose (fh);
 372     }
 373   buf->st_mode = (wfd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) ?
 374     S_IFDIR : S_IFREG;
 375   buf->st_nlink = 1;
 376   buf->st_ino = 0;
 377
 378   if (name[0] && name[1] == ':')
 379     buf->st_dev = tolower (name[0]) - 'a' + 1;
 380   else
 381     buf->st_dev = _getdrive ();
 382   buf->st_rdev = buf->st_dev;
 383
 384   buf->st_size = wfd.nFileSizeLow;
 385
 386   /* Convert timestamps to Unix format. */
 387   buf->st_mtime = convert_time (wfd.ftLastWriteTime);
 388   buf->st_atime = convert_time (wfd.ftLastAccessTime);
 389   if (buf->st_atime == 0) buf->st_atime = buf->st_mtime;
 390   buf->st_ctime = convert_time (wfd.ftCreationTime);
 391   if (buf->st_ctime == 0) buf->st_ctime = buf->st_mtime;
 392
 393   /* determine rwx permissions */
 394   if (wfd.dwFileAttributes & FILE_ATTRIBUTE_READONLY)
 395     permission = S_IREAD;
 396   else
 397     permission = S_IREAD | S_IWRITE;
 398
 399   if (wfd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
 400     permission |= S_IEXEC;
 401   else if (is_exec (name))
 402     permission |= S_IEXEC;
 403
 404   buf->st_mode |= permission | (permission >> 3) | (permission >> 6);
 405
 406   return 0;
 407 }
 408
 409 int
 410 lstat (const char * path, struct stat * buf)
 411 {
 412   return stat (path, buf);
 413 }
 414