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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //boot/delay.4th |
\ Copyright (c) 2008-2011 Devin Teske <devinteske@hotmail.com> \ All rights reserved. \ \ Redistribution and use in source and binary forms, with or without \ modification, are permitted provided that the following conditions \ are met: \ 1. Redistributions of source code must retain the above copyright \ notice, this list of conditions and the following disclaimer. \ 2. Redistributions in binary form must reproduce the above copyright \ notice, this list of conditions and the following disclaimer in the \ documentation and/or other materials provided with the distribution. \ \ THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND \ ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE \ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE \ ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE \ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL \ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS \ OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) \ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT \ LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY \ OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF \ SUCH DAMAGE. \ \ $FreeBSD: release/9.1.0/sys/boot/forth/delay.4th 222417 2011-05-28 08:50:38Z julian $ marker task-delay.4th 2 constant delay_default \ Default delay (in seconds) 3 constant etx_key \ End-of-Text character produced by Ctrl+C 13 constant enter_key \ Carriage-Return character produce by ENTER 27 constant esc_key \ Escape character produced by ESC or Ctrl+[ variable delay_tstart \ state variable used for delay timing variable delay_delay \ determined configurable delay duration variable delay_cancelled \ state variable for user cancellation variable delay_showdots \ whether continually print dots while waiting : delay_execute ( -- ) \ make sure that we have a command to execute s" delay_command" getenv dup -1 = if drop exit then \ read custom time-duration (if set) s" loader_delay" getenv dup -1 = if drop \ no custom duration (remove dup'd bunk -1) delay_default \ use default setting (replacing bunk -1) else \ make sure custom duration is a number ?number 0= if delay_default \ use default if otherwise then then \ initialize state variables delay_delay ! \ stored value is on the stack from above seconds delay_tstart ! \ store the time we started 0 delay_cancelled ! \ boolean flag indicating user-cancelled event false delay_showdots ! \ reset to zero and read from environment s" delay_showdots" getenv dup -1 <> if 2drop \ don't need the value, just existance true delay_showdots ! else drop then \ Loop until we have exceeded the desired time duration begin 25 ms \ sleep for 25 milliseconds (40 iterations/sec) \ throw some dots up on the screen if desired delay_showdots @ if ." ." \ dots visually aid in the perception of time then \ was a key depressed? key? if key \ obtain ASCII value for keystroke dup enter_key = if -1 delay_delay ! \ break loop then dup etx_key = swap esc_key = OR if -1 delay_delay ! \ break loop -1 delay_cancelled ! \ set cancelled flag then then \ if the time duration is set to zero, loop forever \ waiting for either ENTER or Ctrl-C/Escape to be pressed delay_delay @ 0> if \ calculate elapsed time seconds delay_tstart @ - delay_delay @ > else -1 \ break loop then until \ if we were throwing up dots, throw up a line-break delay_showdots @ if cr then \ did the user press either Ctrl-C or Escape? delay_cancelled @ if 2drop \ we don't need the command string anymore else evaluate \ evaluate/execute the command string then ;