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|
\ tag: stdin/stdout handling
\
\ Copyright (C) 2003 Samuel Rydh
\
\ See the file "COPYING" for further information about
\ the copyright and warranty status of this work.
\
\ 7.4.5 I/O control
variable stdout
variable stdin
: input ( dev-str dev-len -- )
2dup find-dev 0= if
." Input device " type ." not found." cr exit
then
" read" rot find-method 0= if
type ." has no read method." cr exit
then
drop
\ open stdin device
2dup open-dev ?dup 0= if
." Opening " type ." failed." cr exit
then
-rot 2drop
\ call install-abort if present
dup " install-abort" rot ['] $call-method catch if 3drop then
\ close old stdin
stdin @ ?dup if
dup " remove-abort" rot ['] $call-method catch if 3drop then
close-dev
then
stdin !
;
: output ( dev-str dev-len -- )
2dup find-dev 0= if
." Output device " type ." not found." cr exit
then
" write" rot find-method 0= if
type ." has no write method." cr exit
then
drop
\ open stdin device
2dup open-dev ?dup 0= if
." Opening " type ." failed." cr exit
then
-rot 2drop
\ close old stdout
stdout @ ?dup if close-dev then
stdout !
;
: io ( dev-str dev-len -- )
2dup input output
;
\ key?, key and emit implementation
variable io-char
variable io-out-char
: io-key? ( -- available? )
io-char @ -1 <> if true exit then
io-char 1 " read" stdin @ $call-method
1 =
;
: io-key ( -- key )
\ poll for key
begin io-key? until
io-char c@ -1 to io-char
;
: io-emit ( char -- )
io-out-char c!
io-out-char 1 " write" stdout @ $call-method drop
;
variable CONSOLE-IN-list
variable CONSOLE-OUT-list
: CONSOLE-IN-initializer ( xt -- )
CONSOLE-IN-list list-add ,
;
: CONSOLE-OUT-initializer ( xt -- )
CONSOLE-OUT-list list-add ,
;
: install-console ( -- )
\ create screen alias
" /aliases" find-package if
>r
" screen" find-package if drop else
\ bad (or missing) screen alias
0 " display" iterate-device-type ?dup if
( display-ph R: alias-ph )
get-package-path encode-string " screen" r@ (property)
then
then
r> drop
then
output-device output
input-device input
\ let arch determine a useful output device
CONSOLE-OUT-list begin list-get while
stdout @ if drop else @ execute then
repeat
\ let arch determine a useful input device
CONSOLE-IN-list begin list-get while
stdin @ if drop else @ execute then
repeat
\ activate console
stdout @ if
['] io-emit to emit
then
stdin @ if
-1 to io-char
['] io-key? to key?
['] io-key to key
then
;
:noname
" screen" output
; CONSOLE-OUT-initializer
|
