kolibrios/programs/develop/oberon07/Lib/Windows32/API.ob07

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(*
Copyright 2016 Anton Krotov
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*)
MODULE API;
IMPORT sys := SYSTEM;
VAR
Alloc*: PROCEDURE [winapi] (uFlags, dwBytes: INTEGER): INTEGER;
Free*: PROCEDURE [winapi] (hMem: INTEGER): INTEGER;
MessageBoxA*: PROCEDURE [winapi] (hWnd, lpText, lpCaption, uType: INTEGER): INTEGER;
ExitProcess*: PROCEDURE [winapi] (code: INTEGER);
strncmp*: PROCEDURE [cdecl] (a, b, n: INTEGER): INTEGER;
GetProcAddress*: PROCEDURE [winapi] (hModule, name: INTEGER): INTEGER;
LoadLibraryA*: PROCEDURE [winapi] (name: INTEGER): INTEGER;
PROCEDURE zeromem*(size, adr: INTEGER);
END zeromem;
PROCEDURE DebugMsg*(lpText, lpCaption: INTEGER);
BEGIN
MessageBoxA(0, lpText, lpCaption, 16)
END DebugMsg;
PROCEDURE GetProc(name: ARRAY OF CHAR; hMOD, adr: INTEGER);
VAR H: INTEGER;
BEGIN
H := GetProcAddress(hMOD, sys.ADR(name[0]));
ASSERT(H # 0);
sys.PUT(adr, H);
END GetProc;
PROCEDURE _NEW*(size: INTEGER): INTEGER;
RETURN Alloc(64, size)
END _NEW;
PROCEDURE _DISPOSE*(p: INTEGER): INTEGER;
RETURN Free(p)
END _DISPOSE;
PROCEDURE init* (esp: INTEGER);
VAR lib: INTEGER;
BEGIN
sys.GET(esp, GetProcAddress);
sys.GET(esp + 4, LoadLibraryA);
lib := LoadLibraryA(sys.ADR("kernel32.dll"));
GetProc("ExitProcess", lib, sys.ADR(ExitProcess));
GetProc("GlobalAlloc", lib, sys.ADR(Alloc));
GetProc("GlobalFree", lib, sys.ADR(Free));
lib := LoadLibraryA(sys.ADR("msvcrt.dll"));
GetProc("strncmp", lib, sys.ADR(strncmp));
lib := LoadLibraryA(sys.ADR("user32.dll"));
GetProc("MessageBoxA", lib, sys.ADR(MessageBoxA));
END init;
END API.