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d96f28bb63
Upstream would like to consider this at more length. See http://lists.gnu.org/archive/html/grub-devel/2009-08/msg00718.html, and the rest of the thread for context. Forwarded: http://lists.gnu.org/archive/html/grub-devel/2009-08/msg00694.html Last-Update: 2013-12-04 Patch-Name: sleep_shift.patch
143 lines
3.1 KiB
C
143 lines
3.1 KiB
C
/* sleep.c - Command to wait a specified number of seconds. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2006,2007,2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/term.h>
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#include <grub/time.h>
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#include <grub/types.h>
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#include <grub/misc.h>
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#include <grub/extcmd.h>
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#include <grub/i18n.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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static const struct grub_arg_option options[] =
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{
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{"verbose", 'v', 0, N_("Verbose countdown."), 0, 0},
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{"interruptible", 'i', 0, N_("Allow to interrupt with ESC."), 0, 0},
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{0, 0, 0, 0, 0, 0}
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};
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static struct grub_term_coordinate *pos;
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static void
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do_print (int n)
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{
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grub_term_restore_pos (pos);
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/* NOTE: Do not remove the trailing space characters.
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They are required to clear the line. */
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grub_printf ("%d ", n);
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grub_refresh ();
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}
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static int
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grub_check_keyboard (void)
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{
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int mods = 0;
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grub_term_input_t term;
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if (grub_term_poll_usb)
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grub_term_poll_usb (0);
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FOR_ACTIVE_TERM_INPUTS(term)
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{
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if (term->getkeystatus)
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mods |= term->getkeystatus (term);
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}
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if (mods >= 0 &&
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(mods & (GRUB_TERM_STATUS_LSHIFT | GRUB_TERM_STATUS_RSHIFT)) != 0)
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return 1;
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if (grub_getkey_noblock () == GRUB_TERM_ESC)
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return 1;
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return 0;
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}
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/* Based on grub_millisleep() from kern/generic/millisleep.c. */
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static int
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grub_interruptible_millisleep (grub_uint32_t ms)
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{
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grub_uint64_t start;
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start = grub_get_time_ms ();
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while (grub_get_time_ms () - start < ms)
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if (grub_check_keyboard ())
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return 1;
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return 0;
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}
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static grub_err_t
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grub_cmd_sleep (grub_extcmd_context_t ctxt, int argc, char **args)
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{
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struct grub_arg_list *state = ctxt->state;
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int n;
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if (argc != 1)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
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n = grub_strtoul (args[0], 0, 10);
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if (n == 0)
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{
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/* Either `0' or broken input. */
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return 0;
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}
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grub_refresh ();
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pos = grub_term_save_pos ();
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for (; n; n--)
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{
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if (state[0].set)
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do_print (n);
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if (state[1].set)
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{
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if (grub_interruptible_millisleep (1000))
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return 1;
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}
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else
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grub_millisleep (1000);
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}
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if (state[0].set)
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do_print (0);
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return 0;
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}
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static grub_extcmd_t cmd;
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GRUB_MOD_INIT(sleep)
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{
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cmd = grub_register_extcmd ("sleep", grub_cmd_sleep, 0,
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N_("NUMBER_OF_SECONDS"),
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N_("Wait for a specified number of seconds."),
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options);
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}
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GRUB_MOD_FINI(sleep)
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{
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grub_unregister_extcmd (cmd);
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}
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