grub/term/terminfo.c
2009-06-10 21:04:23 +00:00

188 lines
4.7 KiB
C

/* 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>
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)
{
while (*str)
grub_putchar (*str++);
}
/* Move the cursor to the given position starting with "0". */
void
grub_terminfo_gotoxy (grub_uint8_t x, grub_uint8_t y)
{
putstr (grub_terminfo_tparm (term.gotoxy, y, x));
}
/* Clear the screen. */
void
grub_terminfo_cls (void)
{
putstr (grub_terminfo_tparm (term.cls));
}
/* Set reverse video mode on. */
void
grub_terminfo_reverse_video_on (void)
{
putstr (grub_terminfo_tparm (term.reverse_video_on));
}
/* Set reverse video mode off. */
void
grub_terminfo_reverse_video_off (void)
{
putstr (grub_terminfo_tparm (term.reverse_video_off));
}
/* Show cursor. */
void
grub_terminfo_cursor_on (void)
{
putstr (grub_terminfo_tparm (term.cursor_on));
}
/* Hide cursor. */
void
grub_terminfo_cursor_off (void)
{
putstr (grub_terminfo_tparm (term.cursor_off));
}
/* 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,
"terminfo [TERM]", "Set terminfo type.");
grub_terminfo_set_current ("vt100");
}
GRUB_MOD_FINI(terminfo)
{
grub_unregister_command (cmd);
}