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{
This file is part of the Free Pascal run time library.
Copyright (c) 2011 by the Free Pascal development team.
Console i/o for the FPC embedded target
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
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.
**********************************************************************}
Unit consoleio;
interface
type
TWriteCharFunc = function(ACh: char; AUserData: pointer): boolean;
TReadCharFunc = function(var ACh: char; AUserData: pointer): boolean;
procedure OpenIO(var f: Text; AWrite: TWriteCharFunc; ARead: TReadCharFunc; AMode: word; AUserData: pointer);
implementation
{$i textrec.inc}
type
PUserData = ^TUserData;
TUserData = record
WriteChar: TWriteCharFunc;
ReadChar: TReadCharFunc;
UserData: Pointer;
end;
function EmptyWrite(ACh: char; AUserData: pointer): boolean;
begin
EmptyWrite:=true;
end;
function EmptyRead(var ACh: char; AUserData: pointer): boolean;
begin
EmptyRead:=true;
ACh:=#0;
end;
procedure Console_Close(var t:TextRec);
begin
end;
function ReadData(Func: TReadCharFunc; UserData: pointer; Buffer: pchar; count: SizeInt): SizeInt;
var
c: char;
got_linechar: boolean;
begin
ReadData:=0;
got_linechar:=false;
while (ReadData < count) and (not got_linechar) do
begin
if Func(c, UserData) then
begin
if c = #10 then
got_linechar:=true;
buffer^:=c;
inc(buffer);
inc(ReadData);
end;
end;
end;
Procedure Console_Read(var t:TextRec);
var
userdata: PUserData;
begin
userdata:=@t.UserData[1];
InOutRes:=0;
t.bufend:=ReadData(userdata^.ReadChar,userdata^.UserData,pchar(t.bufptr),t.bufsize);
t.bufpos:=0;
end;
Procedure Console_Write(var t:TextRec);
var
userdata: PUserData;
p: pchar;
i: SizeInt;
begin
if t.BufPos=0 then exit;
userdata:=@t.UserData[1];
i := 0;
p := pchar(t.bufptr);
while i < t.bufpos do
begin
if not userdata^.WriteChar(p^, userdata^.UserData) then
break;
inc(p);
inc(i);
end;
if i<>t.BufPos then
InOutRes:=101
else
InOutRes:=0;
t.BufPos:=0;
end;
procedure OpenIO(var f: Text; AWrite: TWriteCharFunc; ARead: TReadCharFunc; AMode: word; AUserData: pointer);
var
userdata: PUserData;
begin
{ Essentially just init everything, more or less what Assign(f,'');
does }
FillChar(f,SizeOf(TextRec),0);
{ only set things that are not zero }
TextRec(f).Handle:=UnusedHandle;
TextRec(f).BufSize:=TextRecBufSize;
TextRec(f).Bufptr:=@TextRec(f).Buffer;
TextRec(f).OpenFunc:=nil;
TextRec(f).LineEnd := #13#10;
userdata:=@TextRec(f).UserData[1];
TextRec(f).Mode:=AMode;
case AMode of
fmInput: TextRec(f).Handle:=StdInputHandle;
fmOutput: TextRec(f).Handle:=StdOutputHandle;
end;
TextRec(f).CloseFunc:=@Console_Close;
TextRec(f).FlushFunc:=nil;
case AMode of
fmInput: TextRec(f).InOutFunc:=@Console_Read;
fmOutput:
begin
TextRec(f).InOutFunc:=@Console_Write;
TextRec(f).FlushFunc:=@Console_Write;
end;
end;
userdata^.WriteChar := AWrite;
userdata^.ReadChar := ARead;
userdata^.UserData := AUserData;
end;
procedure SysInitStdIO;
begin
OpenIO(Input, @EmptyWrite, @EmptyRead, fmInput, nil);
OpenIO(Output, @EmptyWrite, @EmptyRead, fmOutput, nil);
OpenIO(ErrOutput, @EmptyWrite, @EmptyRead, fmOutput, nil);
OpenIO(StdOut, @EmptyWrite, @EmptyRead, fmOutput, nil);
OpenIO(StdErr, @EmptyWrite, @EmptyRead, fmOutput, nil);
end;
procedure SysFlushStdIO;
begin
end;
var
ErrorBase : Pointer;external name 'FPC_ERRORBASE';
var
pstdout : ^Text;
{$ifndef CPUAVR}
initialization
{ Setup stdin, stdout and stderr }
SysInitStdIO;
finalization
{ Show runtime error and exit }
pstdout:=@stdout;
If erroraddr<>nil Then
Begin
Writeln(pstdout^,'Runtime error ',Errorcode,' at $',hexstr(erroraddr));
{ to get a nice symify }
Writeln(pstdout^,BackTraceStrFunc(Erroraddr));
dump_stack(pstdout^,ErrorBase);
Writeln(pstdout^,'');
End;
SysFlushStdIO;
{$endif CPUAVR}
end.
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