nt/runemacs.c

   1 /* Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
   2
   3 This file is part of GNU Emacs.
   4
   5 GNU Emacs is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 GNU Emacs is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with GNU Emacs; see the file COPYING.  If not, write to
  17 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18 Boston, MA 02110-1301, USA.  */
  19
  20
  21 /*
  22   Simple program to start Emacs with its console window hidden.
  23
  24   This program is provided purely for convenience, since most users will
  25   use Emacs in windowing (GUI) mode, and will not want to have an extra
  26   console window lying around.  */
  27
  28 /*
  29    You may want to define this if you want to be able to install updated
  30    emacs binaries even when other users are using the current version.
  31    The problem with some file servers (notably Novell) is that an open
  32    file cannot be overwritten, deleted, or even renamed.  So if someone
  33    is running emacs.exe already, you cannot install a newer version.
  34    By defining CHOOSE_NEWEST_EXE, you can name your new emacs.exe
  35    something else which matches "emacs*.exe", and runemacs will
  36    automatically select the newest emacs executeable in the bin directory.
  37    (So you'll probably be able to delete the old version some hours/days
  38    later).
  39 */
  40
  41 /* #define CHOOSE_NEWEST_EXE */
  42
  43 #include <windows.h>
  44 #include <string.h>
  45 #include <malloc.h>
  46
  47 int WINAPI
  48 WinMain (HINSTANCE hSelf, HINSTANCE hPrev, LPSTR cmdline, int nShow)
  49 {
  50   STARTUPINFO start;
  51   SECURITY_ATTRIBUTES sec_attrs;
  52   SECURITY_DESCRIPTOR sec_desc;
  53   PROCESS_INFORMATION child;
  54   int wait_for_child = FALSE;
  55   DWORD priority_class = NORMAL_PRIORITY_CLASS;
  56   DWORD ret_code = 0;
  57   char *new_cmdline;
  58   char *p;
  59   char modname[MAX_PATH];
  60
  61   if (!GetModuleFileName (NULL, modname, MAX_PATH))
  62     goto error;
  63   if ((p = strrchr (modname, '\\')) == NULL)
  64     goto error;
  65   *p = 0;
  66
  67   new_cmdline = alloca (MAX_PATH + strlen (cmdline) + 3);
  68   /* Quote executable name in case of spaces in the path. */
  69   *new_cmdline = '"';
  70   strcpy (new_cmdline + 1, modname);
  71
  72 #ifdef CHOOSE_NEWEST_EXE
  73   {
  74     /* Silly hack to allow new versions to be installed on
  75        server even when current version is in use. */
  76
  77     char * best_name = alloca (MAX_PATH + 1);
  78     FILETIME best_time = {0,0};
  79     WIN32_FIND_DATA wfd;
  80     HANDLE fh;
  81     p = new_cmdline + strlen (new_cmdline);
  82     strcpy (p, "\\emacs*.exe\" ");
  83     fh = FindFirstFile (new_cmdline, &wfd);
  84     if (fh == INVALID_HANDLE_VALUE)
  85       goto error;
  86     do
  87       {
  88         if (wfd.ftLastWriteTime.dwHighDateTime > best_time.dwHighDateTime
  89             || (wfd.ftLastWriteTime.dwHighDateTime == best_time.dwHighDateTime
  90                 && wfd.ftLastWriteTime.dwLowDateTime > best_time.dwLowDateTime))
  91           {
  92             best_time = wfd.ftLastWriteTime;
  93             strcpy (best_name, wfd.cFileName);
  94           }
  95       }
  96     while (FindNextFile (fh, &wfd));
  97     FindClose (fh);
  98     *p++ = '\\';
  99     strcpy (p, best_name);
 100     strcat (p, " ");
 101   }
 102 #else
 103   strcat (new_cmdline, "\\emacs.exe\" ");
 104 #endif
 105
 106   /* Append original arguments if any; first look for arguments we
 107      recognise (-wait, -high, and -low), and apply them ourselves.  */
 108   while (cmdline[0] == '-' || cmdline[0] == '/')
 109     {
 110       if (strncmp (cmdline+1, "wait", 4) == 0)
 111         {
 112       wait_for_child = TRUE;
 113       cmdline += 5;
 114     }
 115       else if (strncmp (cmdline+1, "high", 4) == 0)
 116         {
 117           priority_class = HIGH_PRIORITY_CLASS;
 118           cmdline += 5;
 119         }
 120       else if (strncmp (cmdline+1, "low", 3) == 0)
 121         {
 122           priority_class = IDLE_PRIORITY_CLASS;
 123           cmdline += 4;
 124         }
 125       else
 126         break;
 127     }
 128   strcat (new_cmdline, cmdline);
 129
 130   /* Set emacs_dir variable if runemacs was in "%emacs_dir%\bin".  */
 131   if ((p = strrchr (modname, '\\')) && stricmp (p, "\\bin") == 0)
 132     {
 133       *p = 0;
 134       for (p = modname; *p; p++)
 135         if (*p == '\\') *p = '/';
 136       SetEnvironmentVariable ("emacs_dir", modname);
 137     }
 138
 139   memset (&start, 0, sizeof (start));
 140   start.cb = sizeof (start);
 141   start.dwFlags = STARTF_USESHOWWINDOW | STARTF_USECOUNTCHARS;
 142   start.wShowWindow = SW_HIDE;
 143   /* Ensure that we don't waste memory if the user has specified a huge
 144      default screen buffer for command windows.  */
 145   start.dwXCountChars = 80;
 146   start.dwYCountChars = 25;
 147
 148   sec_attrs.nLength = sizeof (sec_attrs);
 149   sec_attrs.lpSecurityDescriptor = NULL;
 150   sec_attrs.bInheritHandle = FALSE;
 151
 152   if (CreateProcess (NULL, new_cmdline, &sec_attrs, NULL, TRUE, priority_class,
 153                      NULL, NULL, &start, &child))
 154     {
 155       if (wait_for_child)
 156         {
 157           WaitForSingleObject (child.hProcess, INFINITE);
 158           GetExitCodeProcess (child.hProcess, &ret_code);
 159         }
 160       CloseHandle (child.hThread);
 161       CloseHandle (child.hProcess);
 162     }
 163   else
 164     goto error;
 165   return (int) ret_code;
 166
 167 error:
 168   MessageBox (NULL, "Could not start Emacs.", "Error", MB_ICONSTOP);
 169   return 1;
 170 }
 171
 172 /* arch-tag: 7e02df73-4df7-4aa0-baea-99c6d047a384
 173    (do not change this comment) */