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1 /* sleep.c - Command to wait a specified number of seconds. */
2 /*
3 * GRUB -- GRand Unified Bootloader
4 * Copyright (C) 2006,2007,2008 Free Software Foundation, Inc.
5 *
6 * GRUB is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * GRUB is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include <grub/dl.h>
21 #include <grub/term.h>
22 #include <grub/time.h>
23 #include <grub/types.h>
24 #include <grub/misc.h>
25 #include <grub/extcmd.h>
26 #include <grub/i18n.h>
27
28 GRUB_MOD_LICENSE ("GPLv3+");
29
30 static const struct grub_arg_option options[] =
31 {
32 {"verbose", 'v', 0, N_("Verbose countdown."), 0, 0},
33 {"interruptible", 'i', 0, N_("Interruptible with ESC."), 0, 0},
34 {0, 0, 0, 0, 0, 0}
35 };
36
37 static grub_uint16_t *pos;
38
39 static void
40 do_print (int n)
41 {
42 grub_term_restore_pos (pos);
43 /* NOTE: Do not remove the trailing space characters.
44 They are required to clear the line. */
45 grub_printf ("%d ", n);
46 }
47
48 /* Based on grub_millisleep() from kern/generic/millisleep.c. */
49 static int
50 grub_interruptible_millisleep (grub_uint32_t ms)
51 {
52 grub_uint64_t start;
53
54 start = grub_get_time_ms ();
55
56 while (grub_get_time_ms () - start < ms)
57 if (grub_checkkey () >= 0 && grub_getkey () == GRUB_TERM_ESC)
58 return 1;
59
60 return 0;
61 }
62
63 static grub_err_t
64 grub_cmd_sleep (grub_extcmd_context_t ctxt, int argc, char **args)
65 {
66 struct grub_arg_list *state = ctxt->state;
67 int n;
68
69 if (argc != 1)
70 return grub_error (GRUB_ERR_BAD_ARGUMENT, "missing operand");
71
72 n = grub_strtoul (args[0], 0, 10);
73
74 if (n == 0)
75 {
76 /* Either `0' or broken input. */
77 return 0;
78 }
79
80 pos = grub_term_save_pos ();
81
82 for (; n; n--)
83 {
84 if (state[0].set)
85 do_print (n);
86
87 if (state[1].set)
88 {
89 if (grub_interruptible_millisleep (1000))
90 return 1;
91 }
92 else
93 grub_millisleep (1000);
94 }
95 if (state[0].set)
96 do_print (0);
97
98 return 0;
99 }
100
101 static grub_extcmd_t cmd;
102 \f
103 GRUB_MOD_INIT(sleep)
104 {
105 cmd = grub_register_extcmd ("sleep", grub_cmd_sleep, 0,
106 N_("NUMBER_OF_SECONDS"),
107 N_("Wait for a specified number of seconds."),
108 options);
109 }
110
111 GRUB_MOD_FINI(sleep)
112 {
113 grub_unregister_extcmd (cmd);
114 }