[PATCH] sleep.mod

[Robert Millan <rmh@aybabtu.com>]

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A sleep command.

-- 
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call… if you are unable to speak?
(as seen on /.)

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diff -x configure -x config.h.in -x CVS -x '*~' -x '*.mk' -urp -N ../grub2/commands/sleep.c ./commands/sleep.c
--- ../grub2/commands/sleep.c	1970-01-01 01:00:00.000000000 +0100
+++ ./commands/sleep.c	2008-02-08 17:01:51.000000000 +0100
@@ -0,0 +1,110 @@
+/* sleep.c - Command to wait a specified number of seconds.  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2006,2007,2008  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/term.h>
+#include <grub/types.h>
+#include <grub/misc.h>
+#include <grub/normal.h>
+#include <grub/machine/time.h>
+
+static const struct grub_arg_option options[] =
+  {
+    {"verbose", 'v', 0, "verbose countdown", 0, 0},
+    {"interruptible", 'i', 0, "interruptible with ESC", 0, 0},
+    {0, 0, 0, 0, 0, 0}
+  };
+
+static grub_uint8_t x, y;
+
+static void
+do_print (int n)
+{
+  grub_gotoxy (x, y);
+  /* NOTE: Do not remove the trailing space characters.
+     They are required to clear the line.  */
+  grub_printf ("%d    ", n);
+}
+
+/* Based on grub_millisleep() from kern/misc.c.  */
+static int
+grub_interruptible_millisleep (grub_uint32_t ms)
+{
+  grub_uint32_t end_at;
+  
+  end_at = grub_get_rtc () + grub_div_roundup (ms * GRUB_TICKS_PER_SECOND, 1000);
+  
+  while (grub_get_rtc () < end_at)
+    if (GRUB_TERM_ASCII_CHAR (grub_checkkey ()) == GRUB_TERM_ESC)
+      return 1;
+
+  return 0;
+}
+
+static grub_err_t
+grub_cmd_sleep (struct grub_arg_list *state, int argc, char **args)
+{
+  grub_uint16_t xy;
+  int n;
+
+  if (argc != 1)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, "missing operand");
+
+  n = grub_strtoul (args[0], 0, 10);
+
+  if (n == 0)
+    {
+      /* Either `0' or broken input.  */
+      return 0;
+    }
+
+  xy = grub_getxy ();
+  x = xy >> 8;
+  y = xy & 0xff;
+
+  for (; n; n--)
+    {
+      if (state[0].set)
+	do_print (n);
+
+      if (state[1].set)
+	{
+	  if (grub_interruptible_millisleep (1000))
+	    return 1;
+	}
+      else
+	grub_millisleep (1000);
+    }
+  if (state[0].set)
+    do_print (0);
+
+  return 0;
+}
+
+\f
+GRUB_MOD_INIT(sleep)
+{
+  grub_register_command ("sleep", grub_cmd_sleep, GRUB_COMMAND_FLAG_BOTH,
+			 "sleep NUMBER_OF_SECONDS", "Wait for a specified number of seconds", options);
+}
+
+GRUB_MOD_FINI(sleep)
+{
+  grub_unregister_command ("sleep");
+}
diff -x configure -x config.h.in -x CVS -x '*~' -x '*.mk' -urp -N ../grub2/conf/common.rmk ./conf/common.rmk
--- ../grub2/conf/common.rmk	2008-02-06 17:21:45.000000000 +0100
+++ ./conf/common.rmk	2008-02-08 16:08:26.000000000 +0100
@@ -265,7 +265,7 @@ pkglib_MODULES += hello.mod boot.mod ter
 	cmp.mod cat.mod help.mod font.mod search.mod		\
 	loopback.mod configfile.mod echo.mod			\
 	terminfo.mod test.mod blocklist.mod hexdump.mod		\
-	read.mod
+	read.mod sleep.mod
 
 # For hello.mod.
 hello_mod_SOURCES = hello/hello.c
@@ -364,3 +364,8 @@ gzio_mod_LDFLAGS = $(COMMON_LDFLAGS)
 read_mod_SOURCES = commands/read.c
 read_mod_CFLAGS = $(COMMON_CFLAGS)
 read_mod_LDFLAGS = $(COMMON_LDFLAGS)
+
+# For sleep.mod.
+sleep_mod_SOURCES = commands/sleep.c
+sleep_mod_CFLAGS = $(COMMON_CFLAGS)
+sleep_mod_LDFLAGS = $(COMMON_LDFLAGS)