(*
BSD 2-Clause License
Copyright (c) 2020, Anton Krotov
All rights reserved.
*)
MODULE HOST;
IMPORT SYSTEM, Trap;
CONST
slash* = "\";
eol* = 0DX + 0AX;
bit_depth* = 32;
maxint* = 7FFFFFFFH;
minint* = 80000000H;
VAR
maxreal*: REAL;
PROCEDURE syscall0 (fn: INTEGER): INTEGER;
BEGIN
Trap.syscall(SYSTEM.ADR(fn))
RETURN fn
END syscall0;
PROCEDURE syscall1 (fn, p1: INTEGER): INTEGER;
BEGIN
Trap.syscall(SYSTEM.ADR(fn))
RETURN fn
END syscall1;
PROCEDURE syscall2 (fn, p1, p2: INTEGER): INTEGER;
BEGIN
Trap.syscall(SYSTEM.ADR(fn))
RETURN fn
END syscall2;
PROCEDURE syscall3 (fn, p1, p2, p3: INTEGER): INTEGER;
BEGIN
Trap.syscall(SYSTEM.ADR(fn))
RETURN fn
END syscall3;
PROCEDURE syscall4 (fn, p1, p2, p3, p4: INTEGER): INTEGER;
BEGIN
Trap.syscall(SYSTEM.ADR(fn))
RETURN fn
END syscall4;
PROCEDURE ExitProcess* (code: INTEGER);
BEGIN
code := syscall1(0, code)
END ExitProcess;
PROCEDURE GetCurrentDirectory* (VAR path: ARRAY OF CHAR);
VAR
a: INTEGER;
BEGIN
a := syscall2(1, LEN(path), SYSTEM.ADR(path[0]))
END GetCurrentDirectory;
PROCEDURE GetArg* (n: INTEGER; VAR s: ARRAY OF CHAR);
BEGIN
n := syscall3(2, n, LEN(s), SYSTEM.ADR(s[0]))
END GetArg;
PROCEDURE FileRead* (F: INTEGER; VAR Buffer: ARRAY OF CHAR; bytes: INTEGER): INTEGER;
RETURN syscall4(3, F, LEN(Buffer), SYSTEM.ADR(Buffer[0]), bytes)
END FileRead;
PROCEDURE FileWrite* (F: INTEGER; Buffer: ARRAY OF BYTE; bytes: INTEGER): INTEGER;
RETURN syscall4(4, F, LEN(Buffer), SYSTEM.ADR(Buffer[0]), bytes)
END FileWrite;
PROCEDURE FileCreate* (FName: ARRAY OF CHAR): INTEGER;
RETURN syscall2(5, LEN(FName), SYSTEM.ADR(FName[0]))
END FileCreate;
PROCEDURE FileClose* (F: INTEGER);
BEGIN
F := syscall1(6, F)
END FileClose;
PROCEDURE FileOpen* (FName: ARRAY OF CHAR): INTEGER;
RETURN syscall2(7, LEN(FName), SYSTEM.ADR(FName[0]))
END FileOpen;
PROCEDURE chmod* (FName: ARRAY OF CHAR);
VAR
a: INTEGER;
BEGIN
a := syscall2(12, LEN(FName), SYSTEM.ADR(FName[0]))
END chmod;
PROCEDURE OutChar* (c: CHAR);
VAR
a: INTEGER;
BEGIN
a := syscall1(8, ORD(c))
END OutChar;
PROCEDURE GetTickCount* (): INTEGER;
RETURN syscall0(9)
END GetTickCount;
PROCEDURE isRelative* (path: ARRAY OF CHAR): BOOLEAN;
RETURN syscall2(11, LEN(path), SYSTEM.ADR(path[0])) # 0
END isRelative;
PROCEDURE UnixTime* (): INTEGER;
RETURN syscall0(10)
END UnixTime;
PROCEDURE s2d (x: INTEGER; VAR h, l: INTEGER);
VAR
s, e, f: INTEGER;
BEGIN
s := ASR(x, 31) MOD 2;
f := x MOD 800000H;
e := (x DIV 800000H) MOD 256;
IF e = 255 THEN
e := 2047
ELSE
INC(e, 896)
END;
h := LSL(s, 31) + LSL(e, 20) + (f DIV 8);
l := (f MOD 8) * 20000000H
END s2d;
PROCEDURE d2s* (x: REAL): INTEGER;
VAR
i: INTEGER;
BEGIN
SYSTEM.GET(SYSTEM.ADR(x), i)
RETURN i
END d2s;
PROCEDURE splitf* (x: REAL; VAR a, b: INTEGER): INTEGER;
BEGIN
s2d(d2s(x), b, a)
RETURN a
END splitf;
BEGIN
maxreal := 1.9;
PACK(maxreal, 127)
END HOST.