grub/normal/term.c
2010-01-20 09:12:47 +01:00

251 lines
5 KiB
C

/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2002,2003,2005,2007,2008,2009 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/term.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/file.h>
#include <grub/dl.h>
#include <grub/env.h>
#include <grub/normal.h>
/* The amount of lines counted by the pager. */
static unsigned grub_more_lines;
/* If the more pager is active. */
static int grub_more;
static void
process_newline (void)
{
struct grub_term_output *cur;
unsigned height = -1;
FOR_ACTIVE_TERM_OUTPUTS(cur)
if (grub_term_height (cur) < height)
height = grub_term_height (cur);
grub_more_lines++;
if (grub_more && grub_more_lines >= height - 1)
{
char key;
grub_uint16_t *pos;
pos = grub_term_save_pos ();
grub_setcolorstate (GRUB_TERM_COLOR_HIGHLIGHT);
grub_printf ("--MORE--");
grub_setcolorstate (GRUB_TERM_COLOR_STANDARD);
key = grub_getkey ();
/* Remove the message. */
grub_term_restore_pos (pos);
grub_printf (" ");
grub_term_restore_pos (pos);
/* Scroll one lines or an entire page, depending on the key. */
if (key == '\r' || key =='\n')
grub_more_lines = height - 2;
else
grub_more_lines = 0;
}
}
void
grub_set_more (int onoff)
{
if (onoff == 1)
grub_more++;
else
grub_more--;
grub_more_lines = 0;
grub_newline_hook = process_newline;
}
void
grub_puts_terminal (const char *str, struct grub_term_output *term)
{
grub_uint32_t code;
grub_ssize_t ret;
const grub_uint8_t *ptr = (const grub_uint8_t *) str;
const grub_uint8_t *end;
end = (const grub_uint8_t *) (str + grub_strlen (str));
while (*ptr)
{
ret = grub_utf8_to_ucs4 (&code, 1, ptr, end - ptr, &ptr);
grub_putcode (code, term);
}
}
grub_uint16_t *
grub_term_save_pos (void)
{
struct grub_term_output *cur;
unsigned cnt = 0;
grub_uint16_t *ret, *ptr;
FOR_ACTIVE_TERM_OUTPUTS(cur)
cnt++;
ret = grub_malloc (cnt * sizeof (ret[0]));
if (!ret)
return NULL;
ptr = ret;
FOR_ACTIVE_TERM_OUTPUTS(cur)
*ptr++ = grub_term_getxy (cur);
return ret;
}
void
grub_term_restore_pos (grub_uint16_t *pos)
{
struct grub_term_output *cur;
grub_uint16_t *ptr = pos;
if (!pos)
return;
FOR_ACTIVE_TERM_OUTPUTS(cur)
{
grub_term_gotoxy (cur, (*ptr & 0xff00) >> 8, *ptr & 0xff);
ptr++;
}
}
static void
grub_terminal_autoload_free (void)
{
struct grub_term_autoload *cur, *next;
unsigned i;
for (i = 0; i < 2; i++)
for (cur = i ? grub_term_input_autoload : grub_term_output_autoload;
cur; cur = next)
{
next = cur->next;
grub_free (cur->name);
grub_free (cur->modname);
grub_free (cur);
}
grub_term_input_autoload = NULL;
grub_term_output_autoload = NULL;
}
/* Read the file terminal.lst for auto-loading. */
void
read_terminal_list (void)
{
const char *prefix;
char *filename;
grub_file_t file;
char *buf = NULL;
prefix = grub_env_get ("prefix");
if (!prefix)
{
grub_errno = GRUB_ERR_NONE;
return;
}
filename = grub_xasprintf ("%s/terminal.lst", prefix);
if (!filename)
{
grub_errno = GRUB_ERR_NONE;
return;
}
file = grub_file_open (filename);
if (!file)
{
grub_errno = GRUB_ERR_NONE;
return;
}
/* Override previous terminal.lst. */
grub_terminal_autoload_free ();
for (;; grub_free (buf))
{
char *p, *name;
struct grub_term_autoload *cur;
struct grub_term_autoload **target = NULL;
buf = grub_file_getline (file);
if (! buf)
break;
switch (buf[0])
{
case 'i':
target = &grub_term_input_autoload;
break;
case 'o':
target = &grub_term_output_autoload;
break;
}
if (!target)
continue;
name = buf + 1;
p = grub_strchr (name, ':');
if (! p)
continue;
*p = '\0';
while (*++p == ' ')
;
cur = grub_malloc (sizeof (*cur));
if (!cur)
{
grub_errno = GRUB_ERR_NONE;
continue;
}
cur->name = grub_strdup (name);
if (! name)
{
grub_errno = GRUB_ERR_NONE;
grub_free (cur);
continue;
}
cur->modname = grub_strdup (p);
if (! cur->modname)
{
grub_errno = GRUB_ERR_NONE;
grub_free (cur);
grub_free (cur->name);
continue;
}
cur->next = *target;
*target = cur;
}
grub_file_close (file);
grub_errno = GRUB_ERR_NONE;
}