RomWBW/Source/Images/d_cowgol/u0/COMMON.COH

sub print(ptr: [uint8]) is
    loop
        var c := [ptr];
        if c == 0 then
            return;
        end if;
        print_char(c);
        ptr := ptr + 1;
    end loop;
end sub;

sub print_nl() is
	print_char('\n');
end sub;

sub UIToA(value: uint32, base: uint8, buffer: [uint8]): (ptr: [uint8]) is
	ptr := buffer;
	loop
		var rem := value % (base as uint32);
		value := value / (base as uint32);
		if rem < 10 then
			rem := rem + '0';
		else
			rem := rem + ('a' - 10);
		end if;
		[ptr] := rem as uint8;
		ptr := @next ptr;

		if value == 0 then
			break;
		end if;
	end loop;

	var s1 := buffer;
	var s2 := @prev ptr;
	while s2 > s1 loop
		var c := [s1];
		[s1] := [s2];
		[s2] := c;
		s1 := @next s1;
		s2 := @prev s2;
	end loop;

	[ptr] := 0;
end sub;

sub IToA(value: int32, base: uint8, buffer: [uint8]): (ptr: [uint8]) is
	if value < 0 then
		[buffer] := '-';
		buffer := @next buffer;
		value := -value;
	end if;
	ptr := UIToA(value as uint32, base, buffer);
end sub;

sub print_i32(value: uint32) is
    var buffer: uint8[12];
	var pe := UIToA(value, 10, &buffer[0]);
	print(&buffer[0]);
end sub;

sub print_i16(value: uint16) is
    print_i32(value as uint32);
end sub;

sub print_i8(value: uint8) is
    print_i32(value as uint32);
end sub;

sub print_hex_i8(value: uint8) is
    var i: uint8 := 2;
    loop
        var digit := value >> 4;
        if digit < 10 then
            digit := digit + '0';
        else
            digit := digit + ('a' - 10);
        end if;
        print_char(digit);
        value := value << 4;
        i := i - 1;
        if i == 0 then
            break;
        end if;
    end loop;
end sub;

sub print_hex_i16(value: uint16) is
    print_hex_i8((value >> 8) as uint8);
    print_hex_i8(value as uint8);
end sub;

sub print_hex_i32(value: uint32) is
    print_hex_i8((value >> 24) as uint8);
    print_hex_i8((value >> 16) as uint8);
    print_hex_i8((value >> 8) as uint8);
    print_hex_i8(value as uint8);
end sub;

sub AToI(buffer: [uint8]): (result: int32, ptr: [uint8]) is
	var negative: uint8 := 0;
	var base: uint8 := 10;
	ptr := buffer;
	result := 0;
	
	var c := [ptr];
	if (c == '-') then
		negative := 1;
		ptr := ptr + 1;
		c := [ptr];
	end if;
	if (c == '0') then
		case [ptr+1] is
			when 'x':  base := 16;
			when 'o':  base := 8;
			when 'b':  base := 2;
			when 'd':  base := 10;

			when else: ptr := ptr - 2;
		end case;
		ptr := ptr + 2;
		c := [ptr];
	end if;

	loop
		if c >= 'a' then
			c := c - 'a' + 10;
		elseif c >= 'A' then
			c := c - 'A' + 10;
		else
			c := c - '0';
		end if;
		if c >= (base as uint8) then
			break;
		end if;
		result := (result * base as int32) + (c as int32);

		ptr := ptr + 1;
		c := [ptr];
	end loop;

	if negative != 0 then
		result := -result;
	end if;
end sub;

sub MemZero(ptr: [uint8], size: intptr) is
	MemSet(ptr, 0, size);
end sub;