El 23/9/2015 12:25 PM, Rainer Stratmann escribió:
Rather than saving the state in a static way, I prefer implementing a
Push/Pop (LIFO queue) approach to allow for nested pairs of setting and
restoring, like this:
Type IOsCollection = {Any sort of collection, array, list, or record
with linking pointers};
var oldios : IOsCollection;
procedure PushTio(tio : termios);
begin
//Stores tio in the oldios: IOsCollection, and advances a pointer, index, etc.,
if necessary
end;
funtion PopTio: termios;
begin
//Retrieves and removes last pushed tio from the oldios: IOsCollection
end;
procedure crt_output_set_normal;
var tio : termios;
begin
tcgetattr( 1 , tio );
PushTio(tio);
// !
tio.c_oflag := tio.c_oflag or OPOST or ONLCR;
// !
tcsetattr( 1 , TCSANOW , tio );
end;
procedure crt_output_restore;
begin
// tcsetattr( 1 , TCSANOW , oldio ); //old suggestion
tcsetattr( 1 , TCSANOW , PopTio );
end;
_______________________________________________
fpc-pascal maillist - fpc-pascal@lists.freepascal.org
http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
-----------------------------------------------------
I repeat it here for the sake of clarity
-----------------------------------------------------
Type IOsCollection = {Any sort of collection, array, list, or record
with linking pointers};
var oldios : IOsCollection;
procedure PushTio(tio : termios);
begin
//Stores tio in the IOsCollection, and advances a pointer, index, etc., if
necessary
end;
funtion PopTio: termios;
begin
//Retrieves and removes last pushed tio from the IOsCollection
end;
procedure crt_output_set_normal;
var tio : termios;
begin
tcgetattr( 1 , tio );
PushTio(tio);
// !
tio.c_oflag := tio.c_oflag or OPOST or ONLCR;
// !
tcsetattr( 1 , TCSANOW , tio );
end;
procedure crt_output_restore;
begin
tcsetattr( 1 , TCSANOW , PopTio );
end;
---------------------------------------------
Now you can nest them
---------------------------------------------
uses AnyUnit {Unit that implements crt_output_set_any_other_tio_state and
any_other_tio_modifyng_routine};
procedure any_tio_modifyng_routine; forward;
procedure MyNestingExample;
begin
crt_output_set_normal;
// Do some outputs
any_tio_modifyng_routine;
//keep working;
crt_output_restore
end;
procedure any_tio_modifyng_routine;
begin
crt_output_set_any_other_tio_state;
// Do some outputs
any_other_tio_modifyng_routine;
//keep working;
crt_output_restore
end;
Best regards,
Roger Rivero
_______________________________________________
fpc-pascal maillist - fpc-pascal@lists.freepascal.org
http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
