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