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 executable 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   PROCESS_INFORMATION child;
  53   int wait_for_child = FALSE;
  54   DWORD priority_class = NORMAL_PRIORITY_CLASS;
  55   DWORD ret_code = 0;
  56   char *new_cmdline;
  57   char *p;
  58   char modname[MAX_PATH];
  59
  60   if (!GetModuleFileName (NULL, modname, MAX_PATH))
  61     goto error;
  62   if ((p = strrchr (modname, '\\')) == NULL)
  63     goto error;
  64   *p = 0;
  65
  66   new_cmdline = alloca (MAX_PATH + strlen (cmdline) + 3);
  67   /* Quote executable name in case of spaces in the path. */
  68   *new_cmdline = '"';
  69   strcpy (new_cmdline + 1, modname);
  70
  71 #ifdef CHOOSE_NEWEST_EXE
  72   {
  73     /* Silly hack to allow new versions to be installed on
  74        server even when current version is in use. */
  75
  76     char * best_name = alloca (MAX_PATH + 1);
  77     FILETIME best_time = {0,0};
  78     WIN32_FIND_DATA wfd;
  79     HANDLE fh;
  80     p = new_cmdline + strlen (new_cmdline);
  81     strcpy (p, "\\emacs*.exe\" ");
  82     fh = FindFirstFile (new_cmdline, &wfd);
  83     if (fh == INVALID_HANDLE_VALUE)
  84       goto error;
  85     do
  86       {
  87         if (wfd.ftLastWriteTime.dwHighDateTime > best_time.dwHighDateTime
  88             || (wfd.ftLastWriteTime.dwHighDateTime == best_time.dwHighDateTime
  89                 && wfd.ftLastWriteTime.dwLowDateTime > best_time.dwLowDateTime))
  90           {
  91             best_time = wfd.ftLastWriteTime;
  92             strcpy (best_name, wfd.cFileName);
  93           }
  94       }
  95     while (FindNextFile (fh, &wfd));
  96     FindClose (fh);
  97     *p++ = '\\';
  98     strcpy (p, best_name);
  99     strcat (p, " ");
 100   }
 101 #else
 102   strcat (new_cmdline, "\\emacs.exe\" ");
 103 #endif
 104
 105   /* Append original arguments if any; first look for arguments we
 106      recognise (-wait, -high, and -low), and apply them ourselves.  */
 107   while (cmdline[0] == '-' || cmdline[0] == '/')
 108     {
 109       if (strncmp (cmdline+1, "wait", 4) == 0)
 110         {
 111           wait_for_child = TRUE;
 112           cmdline += 5;
 113         }
 114       else if (strncmp (cmdline+1, "high", 4) == 0)
 115         {
 116           priority_class = HIGH_PRIORITY_CLASS;
 117           cmdline += 5;
 118         }
 119       else if (strncmp (cmdline+1, "low", 3) == 0)
 120         {
 121           priority_class = IDLE_PRIORITY_CLASS;
 122           cmdline += 4;
 123         }
 124       else
 125         break;
 126       /* Look for next argument.  */
 127       while (*++cmdline == ' ');
 128     }
 129
 130   strcat (new_cmdline, cmdline);
 131
 132   /* Set emacs_dir variable if runemacs was in "%emacs_dir%\bin".  */
 133   if ((p = strrchr (modname, '\\')) && stricmp (p, "\\bin") == 0)
 134     {
 135       *p = 0;
 136       for (p = modname; *p; p++)
 137         if (*p == '\\') *p = '/';
 138       SetEnvironmentVariable ("emacs_dir", modname);
 139     }
 140
 141   memset (&start, 0, sizeof (start));
 142   start.cb = sizeof (start);
 143   start.dwFlags = STARTF_USESHOWWINDOW | STARTF_USECOUNTCHARS;
 144   start.wShowWindow = SW_HIDE;
 145   /* Ensure that we don't waste memory if the user has specified a huge
 146      default screen buffer for command windows.  */
 147   start.dwXCountChars = 80;
 148   start.dwYCountChars = 25;
 149
 150   sec_attrs.nLength = sizeof (sec_attrs);
 151   sec_attrs.lpSecurityDescriptor = NULL;
 152   sec_attrs.bInheritHandle = FALSE;
 153
 154   if (CreateProcess (NULL, new_cmdline, &sec_attrs, NULL, TRUE, priority_class,
 155                      NULL, NULL, &start, &child))
 156     {
 157       if (wait_for_child)
 158         {
 159           WaitForSingleObject (child.hProcess, INFINITE);
 160           GetExitCodeProcess (child.hProcess, &ret_code);
 161         }
 162       CloseHandle (child.hThread);
 163       CloseHandle (child.hProcess);
 164     }
 165   else
 166     goto error;
 167   return (int) ret_code;
 168
 169 error:
 170   MessageBox (NULL, "Could not start Emacs.", "Error", MB_ICONSTOP);
 171   return 1;
 172 }
 173
 174 /* arch-tag: 7e02df73-4df7-4aa0-baea-99c6d047a384
 175    (do not change this comment) */