nt/runemacs.c

   1 /* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
   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 3 of the License, or
   9 (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19
  20 /*
  21   Simple program to start Emacs with its console window hidden.
  22
  23   This program is provided purely for convenience, since most users will
  24   use Emacs in windowing (GUI) mode, and will not want to have an extra
  25   console window lying around.  */
  26
  27 /*
  28    You may want to define this if you want to be able to install updated
  29    emacs binaries even when other users are using the current version.
  30    The problem with some file servers (notably Novell) is that an open
  31    file cannot be overwritten, deleted, or even renamed.  So if someone
  32    is running emacs.exe already, you cannot install a newer version.
  33    By defining CHOOSE_NEWEST_EXE, you can name your new emacs.exe
  34    something else which matches "emacs*.exe", and runemacs will
  35    automatically select the newest emacs executable in the bin directory.
  36    (So you'll probably be able to delete the old version some hours/days
  37    later).
  38 */
  39
  40 /* #define CHOOSE_NEWEST_EXE */
  41
  42 #include <windows.h>
  43 #include <string.h>
  44 #include <malloc.h>
  45
  46 int WINAPI
  47 WinMain (HINSTANCE hSelf, HINSTANCE hPrev, LPSTR cmdline, int nShow)
  48 {
  49   STARTUPINFO start;
  50   SECURITY_ATTRIBUTES sec_attrs;
  51   PROCESS_INFORMATION child;
  52   int wait_for_child = FALSE;
  53   DWORD priority_class = NORMAL_PRIORITY_CLASS;
  54   DWORD ret_code = 0;
  55   char *new_cmdline;
  56   char *p;
  57   char modname[MAX_PATH];
  58
  59   if (!GetModuleFileName (NULL, modname, MAX_PATH))
  60     goto error;
  61   if ((p = strrchr (modname, '\\')) == NULL)
  62     goto error;
  63   *p = 0;
  64
  65   new_cmdline = alloca (MAX_PATH + strlen (cmdline) + 3);
  66   /* Quote executable name in case of spaces in the path. */
  67   *new_cmdline = '"';
  68   strcpy (new_cmdline + 1, modname);
  69
  70 #ifdef CHOOSE_NEWEST_EXE
  71   {
  72     /* Silly hack to allow new versions to be installed on
  73        server even when current version is in use. */
  74
  75     char * best_name = alloca (MAX_PATH + 1);
  76     FILETIME best_time = {0,0};
  77     WIN32_FIND_DATA wfd;
  78     HANDLE fh;
  79     p = new_cmdline + strlen (new_cmdline);
  80     strcpy (p, "\\emacs*.exe\" ");
  81     fh = FindFirstFile (new_cmdline, &wfd);
  82     if (fh == INVALID_HANDLE_VALUE)
  83       goto error;
  84     do
  85       {
  86         if (wfd.ftLastWriteTime.dwHighDateTime > best_time.dwHighDateTime
  87             || (wfd.ftLastWriteTime.dwHighDateTime == best_time.dwHighDateTime
  88                 && wfd.ftLastWriteTime.dwLowDateTime > best_time.dwLowDateTime))
  89           {
  90             best_time = wfd.ftLastWriteTime;
  91             strcpy (best_name, wfd.cFileName);
  92           }
  93       }
  94     while (FindNextFile (fh, &wfd));
  95     FindClose (fh);
  96     *p++ = '\\';
  97     strcpy (p, best_name);
  98     strcat (p, " ");
  99   }
 100 #else
 101   strcat (new_cmdline, "\\emacs.exe\" ");
 102 #endif
 103
 104   /* Append original arguments if any; first look for arguments we
 105      recognise (-wait, -high, and -low), and apply them ourselves.  */
 106   while (cmdline[0] == '-' || cmdline[0] == '/')
 107     {
 108       if (strncmp (cmdline+1, "wait", 4) == 0)
 109         {
 110           wait_for_child = TRUE;
 111           cmdline += 5;
 112         }
 113       else if (strncmp (cmdline+1, "high", 4) == 0)
 114         {
 115           priority_class = HIGH_PRIORITY_CLASS;
 116           cmdline += 5;
 117         }
 118       else if (strncmp (cmdline+1, "low", 3) == 0)
 119         {
 120           priority_class = IDLE_PRIORITY_CLASS;
 121           cmdline += 4;
 122         }
 123       else
 124         break;
 125       /* Look for next argument.  */
 126       while (*++cmdline == ' ');
 127     }
 128
 129   strcat (new_cmdline, cmdline);
 130
 131   /* Set emacs_dir variable if runemacs was in "%emacs_dir%\bin".  */
 132   if ((p = strrchr (modname, '\\')) && stricmp (p, "\\bin") == 0)
 133     {
 134       *p = 0;
 135       for (p = modname; *p; p++)
 136         if (*p == '\\') *p = '/';
 137       SetEnvironmentVariable ("emacs_dir", modname);
 138     }
 139
 140   memset (&start, 0, sizeof (start));
 141   start.cb = sizeof (start);
 142   start.dwFlags = STARTF_USESHOWWINDOW | STARTF_USECOUNTCHARS;
 143   start.wShowWindow = SW_HIDE;
 144   /* Ensure that we don't waste memory if the user has specified a huge
 145      default screen buffer for command windows.  */
 146   start.dwXCountChars = 80;
 147   start.dwYCountChars = 25;
 148
 149   sec_attrs.nLength = sizeof (sec_attrs);
 150   sec_attrs.lpSecurityDescriptor = NULL;
 151   sec_attrs.bInheritHandle = FALSE;
 152
 153   if (CreateProcess (NULL, new_cmdline, &sec_attrs, NULL, TRUE, priority_class,
 154                      NULL, NULL, &start, &child))
 155     {
 156       if (wait_for_child)
 157         {
 158           WaitForSingleObject (child.hProcess, INFINITE);
 159           GetExitCodeProcess (child.hProcess, &ret_code);
 160         }
 161       CloseHandle (child.hThread);
 162       CloseHandle (child.hProcess);
 163     }
 164   else
 165     goto error;
 166   return (int) ret_code;
 167
 168 error:
 169   MessageBox (NULL, "Could not start Emacs.", "Error", MB_ICONSTOP);
 170   return 1;
 171 }
 172
 173 /* arch-tag: 7e02df73-4df7-4aa0-baea-99c6d047a384
 174    (do not change this comment) */