nt/runemacs.c

   1 /* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
   2      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., 51 Franklin Street, Fifth Floor,
  19 Boston, MA 02110-1301, USA.  */
  20
  21
  22 /*
  23   Simple program to start Emacs with its console window hidden.
  24
  25   This program is provided purely for convenience, since most users will
  26   use Emacs in windowing (GUI) mode, and will not want to have an extra
  27   console window lying around.  */
  28
  29 /*
  30    You may want to define this if you want to be able to install updated
  31    emacs binaries even when other users are using the current version.
  32    The problem with some file servers (notably Novell) is that an open
  33    file cannot be overwritten, deleted, or even renamed.  So if someone
  34    is running emacs.exe already, you cannot install a newer version.
  35    By defining CHOOSE_NEWEST_EXE, you can name your new emacs.exe
  36    something else which matches "emacs*.exe", and runemacs will
  37    automatically select the newest emacs executable in the bin directory.
  38    (So you'll probably be able to delete the old version some hours/days
  39    later).
  40 */
  41
  42 /* #define CHOOSE_NEWEST_EXE */
  43
  44 #include <windows.h>
  45 #include <string.h>
  46 #include <malloc.h>
  47
  48 int WINAPI
  49 WinMain (HINSTANCE hSelf, HINSTANCE hPrev, LPSTR cmdline, int nShow)
  50 {
  51   STARTUPINFO start;
  52   SECURITY_ATTRIBUTES sec_attrs;
  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       /* Look for next argument.  */
 128       while (*++cmdline == ' ');
 129     }
 130
 131   strcat (new_cmdline, cmdline);
 132
 133   /* Set emacs_dir variable if runemacs was in "%emacs_dir%\bin".  */
 134   if ((p = strrchr (modname, '\\')) && stricmp (p, "\\bin") == 0)
 135     {
 136       *p = 0;
 137       for (p = modname; *p; p++)
 138         if (*p == '\\') *p = '/';
 139       SetEnvironmentVariable ("emacs_dir", modname);
 140     }
 141
 142   memset (&start, 0, sizeof (start));
 143   start.cb = sizeof (start);
 144   start.dwFlags = STARTF_USESHOWWINDOW | STARTF_USECOUNTCHARS;
 145   start.wShowWindow = SW_HIDE;
 146   /* Ensure that we don't waste memory if the user has specified a huge
 147      default screen buffer for command windows.  */
 148   start.dwXCountChars = 80;
 149   start.dwYCountChars = 25;
 150
 151   sec_attrs.nLength = sizeof (sec_attrs);
 152   sec_attrs.lpSecurityDescriptor = NULL;
 153   sec_attrs.bInheritHandle = FALSE;
 154
 155   if (CreateProcess (NULL, new_cmdline, &sec_attrs, NULL, TRUE, priority_class,
 156                      NULL, NULL, &start, &child))
 157     {
 158       if (wait_for_child)
 159         {
 160           WaitForSingleObject (child.hProcess, INFINITE);
 161           GetExitCodeProcess (child.hProcess, &ret_code);
 162         }
 163       CloseHandle (child.hThread);
 164       CloseHandle (child.hProcess);
 165     }
 166   else
 167     goto error;
 168   return (int) ret_code;
 169
 170 error:
 171   MessageBox (NULL, "Could not start Emacs.", "Error", MB_ICONSTOP);
 172   return 1;
 173 }
 174
 175 /* arch-tag: 7e02df73-4df7-4aa0-baea-99c6d047a384
 176    (do not change this comment) */