Difference between revisions of "Raw I/O"
Jump to navigation
Jump to search
m (clarification of stdio usage) |
|||
| (One intermediate revision by the same user not shown) | |||
| Line 1: | Line 1: | ||
==Raw terminal I/O in ScarletDME== | ==Raw terminal I/O in ScarletDME== | ||
| − | If you want to read from input without any character translation, it's necessary to disable some of the helpful processing that SD does. | + | If you want to read from input without any character translation, it's necessary to disable some of the helpful processing that SD does. By default the input stream |
is converted from lower case to upper case (and vice versa), and Ctrl-C is processed as a break character. The output is formatted so as to require user to | is converted from lower case to upper case (and vice versa), and Ctrl-C is processed as a break character. The output is formatted so as to require user to | ||
press <return> after each screen full of characters. | press <return> after each screen full of characters. | ||
| Line 18: | Line 18: | ||
| − | Once you've done this, it is still necessary to take care getting | + | Once you've done this, it is still necessary to take care getting piped standard input (stdio) into Scarlet. Like this:- |
$include syscom err.h | $include syscom err.h | ||
Latest revision as of 07:28, 11 March 2010
Raw terminal I/O in ScarletDME
If you want to read from input without any character translation, it's necessary to disable some of the helpful processing that SD does. By default the input stream is converted from lower case to upper case (and vice versa), and Ctrl-C is processed as a break character. The output is formatted so as to require user to press <return> after each screen full of characters.
The following bit of code completely disables ALL formatting:-
execute "TERM 32767,32767 NULL" echo off ;* Disables iput echoing prompt "" ;* Disables input prompt character junk=@(0, 0) ;* Disables output paging junk = junk ;* Supress compiler warning from above line term_settings = ttyget() ;* get parameters term_settings<1> = 0 ;* Ctrl-C treated as the break key? (PTERM BREAK mode) term_settings<2> = 0 ;* Case inversion on? (PTERM CASE mode) ttyset term_settings ;* set parameters
Once you've done this, it is still necessary to take care getting piped standard input (stdio) into Scarlet. Like this:-
$include syscom err.h
count = 0
s = 1 ;* flag for more chars in stdin - we assume so at beginning
loop
count += 1
string=keyin()
if status() = er$eof then s = 0
query_string := string
while s
while count < 1000000 ;* upper size limit
repeat
Glen is working on a single statement that the compiler can interpret to do the case conversion disable.
Ashley Chapman 2009-09-23
