automake commit without merge history

grub-core/term/terminfo.c

@@ -0,0 +1,189 @@
+/* terminfo.c - simple terminfo module */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2003,2004,2005,2007  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/>.
+ */
+
+/*
+ * This file contains various functions dealing with different
+ * terminal capabilities. For example, vt52 and vt100.
+ */
+
+#include <grub/types.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/err.h>
+#include <grub/dl.h>
+#include <grub/term.h>
+#include <grub/terminfo.h>
+#include <grub/tparm.h>
+#include <grub/command.h>
+#include <grub/i18n.h>
+
+struct terminfo
+{
+  char *name;
+
+  char *gotoxy;
+  char *cls;
+  char *reverse_video_on;
+  char *reverse_video_off;
+  char *cursor_on;
+  char *cursor_off;
+};
+
+static struct terminfo term;
+
+/* Get current terminfo name.  */
+char *
+grub_terminfo_get_current (void)
+{
+  return term.name;
+}
+
+/* Free *PTR and set *PTR to NULL, to prevent double-free.  */
+static void
+grub_terminfo_free (char **ptr)
+{
+  grub_free (*ptr);
+  *ptr = 0;
+}
+
+/* Set current terminfo type.  */
+grub_err_t
+grub_terminfo_set_current (const char *str)
+{
+  /* TODO
+   * Lookup user specified terminfo type. If found, set term variables
+   * as appropriate. Otherwise return an error.
+   *
+   * How should this be done?
+   *  a. A static table included in this module.
+   *     - I do not like this idea.
+   *  b. A table stored in the configuration directory.
+   *     - Users must convert their terminfo settings if we have not already.
+   *  c. Look for terminfo files in the configuration directory.
+   *     - /usr/share/terminfo is 6.3M on my system.
+   *     - /usr/share/terminfo is not on most users boot partition.
+   *     + Copying the terminfo files you want to use to the grub
+   *       configuration directory is easier then (b).
+   *  d. Your idea here.
+   */
+
+  /* Free previously allocated memory.  */
+  grub_terminfo_free (&term.name);
+  grub_terminfo_free (&term.gotoxy);
+  grub_terminfo_free (&term.cls);
+  grub_terminfo_free (&term.reverse_video_on);
+  grub_terminfo_free (&term.reverse_video_off);
+  grub_terminfo_free (&term.cursor_on);
+  grub_terminfo_free (&term.cursor_off);
+
+  if (grub_strcmp ("vt100", str) == 0)
+    {
+      term.name              = grub_strdup ("vt100");
+      term.gotoxy            = grub_strdup ("\e[%i%p1%d;%p2%dH");
+      term.cls               = grub_strdup ("\e[H\e[J");
+      term.reverse_video_on  = grub_strdup ("\e[7m");
+      term.reverse_video_off = grub_strdup ("\e[m");
+      term.cursor_on         = grub_strdup ("\e[?25h");
+      term.cursor_off        = grub_strdup ("\e[?25l");
+      return grub_errno;
+    }
+
+  return grub_error (GRUB_ERR_BAD_ARGUMENT, "unknown terminfo type");
+}
+
+/* Wrapper for grub_putchar to write strings.  */
+static void
+putstr (const char *str, grub_term_output_t oterm)
+{
+  while (*str)
+    grub_putcode (*str++, oterm);
+}
+
+/* Move the cursor to the given position starting with "0".  */
+void
+grub_terminfo_gotoxy (grub_uint8_t x, grub_uint8_t y, grub_term_output_t oterm)
+{
+  putstr (grub_terminfo_tparm (term.gotoxy, y, x), oterm);
+}
+
+/* Clear the screen.  */
+void
+grub_terminfo_cls (grub_term_output_t oterm)
+{
+  putstr (grub_terminfo_tparm (term.cls), oterm);
+}
+
+/* Set reverse video mode on.  */
+void
+grub_terminfo_reverse_video_on (grub_term_output_t oterm)
+{
+  putstr (grub_terminfo_tparm (term.reverse_video_on), oterm);
+}
+
+/* Set reverse video mode off.  */
+void
+grub_terminfo_reverse_video_off (grub_term_output_t oterm)
+{
+  putstr (grub_terminfo_tparm (term.reverse_video_off), oterm);
+}
+
+/* Show cursor.  */
+void
+grub_terminfo_cursor_on (grub_term_output_t oterm)
+{
+  putstr (grub_terminfo_tparm (term.cursor_on), oterm);
+}
+
+/* Hide cursor.  */
+void
+grub_terminfo_cursor_off (grub_term_output_t oterm)
+{
+  putstr (grub_terminfo_tparm (term.cursor_off), oterm);
+}
+
+/* GRUB Command.  */
+
+static grub_err_t
+grub_cmd_terminfo (grub_command_t cmd __attribute__ ((unused)),
+		   int argc, char **args)
+{
+  if (argc == 0)
+  {
+    grub_printf ("Current terminfo type: %s\n", grub_terminfo_get_current());
+    return GRUB_ERR_NONE;
+  }
+  else if (argc != 1)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, "too many parameters");
+  else
+    return grub_terminfo_set_current (args[0]);
+}
+
+static grub_command_t cmd;
+
+GRUB_MOD_INIT(terminfo)
+{
+  cmd = grub_register_command ("terminfo", grub_cmd_terminfo,
+			       N_("[TERM]"), N_("Set terminfo type."));
+  grub_terminfo_set_current ("vt100");
+}
+
+GRUB_MOD_FINI(terminfo)
+{
+  grub_unregister_command (cmd);
+}