src/w32common.h

   1 /* Common functions for Microsoft Windows builds of Emacs
   2    Copyright (C) 2012-2018 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 (at
   9 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 <https://www.gnu.org/licenses/>.
  18
  19 */
  20
  21 #ifndef W32COMMON_H
  22 #define W32COMMON_H
  23
  24 #include <windows.h>
  25
  26 #define ROUND_UP(p, align)   (((DWORD_PTR)(p) + (align)-1) & ~((DWORD_PTR)(align)-1))
  27 #define ROUND_DOWN(p, align) ((DWORD_PTR)(p) & ~((DWORD_PTR)(align)-1))
  28
  29 #define get_page_size()                 sysinfo_cache.dwPageSize
  30 #define get_allocation_unit()           sysinfo_cache.dwAllocationGranularity
  31 #define get_processor_type()            sysinfo_cache.dwProcessorType
  32 #define get_w32_major_version()         w32_major_version
  33 #define get_w32_minor_version()         w32_minor_version
  34
  35 extern SYSTEM_INFO    sysinfo_cache;
  36 extern OSVERSIONINFO  osinfo_cache;
  37 extern DWORD_PTR      syspage_mask;
  38
  39 extern int            w32_major_version;
  40 extern int            w32_minor_version;
  41 extern int            w32_build_number;
  42
  43 enum {
  44   OS_9X = 1,
  45   OS_NT
  46 };
  47
  48 extern int os_subtype;
  49
  50 /* Cache system info, e.g., the NT page size.  */
  51 extern void cache_system_info (void);
  52
  53 typedef void (* VOIDFNPTR) (void);
  54
  55 /* Load a function address from a DLL.  Cast the result via VOIDFNPTR
  56    to pacify -Wcast-function-type in GCC 8.1.  The return value must
  57    be cast to the correct function pointer type.  */
  58 INLINE VOIDFNPTR get_proc_addr (HINSTANCE, LPCSTR);
  59 INLINE VOIDFNPTR
  60 get_proc_addr (HINSTANCE handle, LPCSTR fname)
  61 {
  62   return (VOIDFNPTR) GetProcAddress (handle, fname);
  63 }
  64
  65 /* Define a function that will be loaded from a DLL.  The variable
  66    arguments should contain the argument list for the function, and
  67    optionally be followed by function attributes.  For example:
  68    DEF_DLL_FN (void, png_longjmp, (png_structp, int) PNG_NORETURN);
  69   */
  70 #define DEF_DLL_FN(type, func, ...)                     \
  71   typedef type (CDECL *W32_PFN_##func) __VA_ARGS__;     \
  72   static W32_PFN_##func fn_##func
  73
  74 /* Load a function from the DLL.  */
  75 #define LOAD_DLL_FN(lib, func)                                          \
  76   do                                                                    \
  77     {                                                                   \
  78       fn_##func = (W32_PFN_##func) get_proc_addr (lib, #func);          \
  79       if (!fn_##func)                                                   \
  80         return false;                                                   \
  81     }                                                                   \
  82   while (false)
  83
  84 #endif /* W32COMMON_H */