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grub2/grub-core/normal/menu_entry.c
Peter Jones 3f05d693d1 malloc: Use overflow checking primitives where we do complex allocations 
This attempts to fix the places where we do the following where
arithmetic_expr may include unvalidated data:

  X = grub_malloc(arithmetic_expr);

It accomplishes this by doing the arithmetic ahead of time using grub_add(),
grub_sub(), grub_mul() and testing for overflow before proceeding.

Among other issues, this fixes:
  - allocation of integer overflow in grub_video_bitmap_create()
    reported by Chris Coulson,
  - allocation of integer overflow in grub_png_decode_image_header()
    reported by Chris Coulson,
  - allocation of integer overflow in grub_squash_read_symlink()
    reported by Chris Coulson,
  - allocation of integer overflow in grub_ext2_read_symlink()
    reported by Chris Coulson,
  - allocation of integer overflow in read_section_as_string()
    reported by Chris Coulson.

Fixes: CVE-2020-14309, CVE-2020-14310, CVE-2020-14311

Signed-off-by: Peter Jones <pjones@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
2020-07-29 16:55:47 +02:00

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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2005,2006,2007,2008,2009 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/normal.h>
#include <grub/term.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/loader.h>
#include <grub/command.h>
#include <grub/parser.h>
#include <grub/script_sh.h>
#include <grub/auth.h>
#include <grub/i18n.h>
#include <grub/charset.h>
#include <grub/safemath.h>
enum update_mode
{
NO_LINE,
SINGLE_LINE,
ALL_LINES
};
struct line
{
/* The line buffer. */
grub_uint32_t *buf;
/* The length of the line. */
int len;
/* The maximum length of the line. */
int max_len;
struct grub_term_pos **pos;
};
struct per_term_screen
{
struct grub_term_output *term;
int y_line_start;
struct grub_term_screen_geometry geo;
/* Scratch variables used when updating. Having them here avoids
loads of small mallocs. */
int orig_num;
int down;
enum update_mode mode;
};
struct screen
{
/* The array of lines. */
struct line *lines;
/* The number of lines. */
int num_lines;
/* The current column. */
int column;
/* The real column. */
int real_column;
/* The current line. */
int line;
/* The kill buffer. */
char *killed_text;
/* The flag of a completion window. */
int completion_shown;
int submenu;
struct per_term_screen *terms;
unsigned nterms;
};
/* Used for storing completion items temporarily. */
static struct {
char *buf;
grub_size_t len;
grub_size_t max_len;
} completion_buffer;
static int completion_type;
/* Initialize a line. */
static int
init_line (struct screen *screen, struct line *linep)
{
linep->len = 0;
linep->max_len = 80;
linep->buf = grub_calloc (linep->max_len + 1, sizeof (linep->buf[0]));
linep->pos = grub_calloc (screen->nterms, sizeof (linep->pos[0]));
if (! linep->buf || !linep->pos)
{
grub_free (linep->buf);
grub_free (linep->pos);
return 0;
}
return 1;
}
/* Allocate extra space if necessary. */
static int
ensure_space (struct line *linep, int extra)
{
if (linep->max_len < linep->len + extra)
{
grub_size_t sz0, sz1;
if (grub_add (linep->len, extra, &sz0) ||
grub_mul (sz0, 2, &sz0) ||
grub_add (sz0, 1, &sz1) ||
grub_mul (sz1, sizeof (linep->buf[0]), &sz1))
return 0;
linep->buf = grub_realloc (linep->buf, sz1);
if (! linep->buf)
return 0;
linep->max_len = sz0;
}
return 1;
}
/* Return the number of lines occupied by this line on the screen. */
static int
get_logical_num_lines (struct line *linep, struct per_term_screen *term_screen)
{
grub_size_t width = grub_getstringwidth (linep->buf, linep->buf + linep->len,
term_screen->term);
/* Empty line still consumes space on screen */
return width ? (width + (unsigned) term_screen->geo.entry_width - 1) /
(unsigned) term_screen->geo.entry_width
: 1;
}
static void
advance_to (struct screen *screen, int c)
{
if (c > screen->lines[screen->line].len)
c = screen->lines[screen->line].len;
screen->column = grub_unicode_get_comb_end (screen->lines[screen->line].buf
+ screen->lines[screen->line].len,
screen->lines[screen->line].buf
+ c)
- screen->lines[screen->line].buf;
}
/* Print an empty line. */
static void
print_empty_line (int y, struct per_term_screen *term_screen)
{
int i;
grub_term_gotoxy (term_screen->term,
(struct grub_term_coordinate) { term_screen->geo.first_entry_x,
y + term_screen->geo.first_entry_y });
for (i = 0; i < term_screen->geo.entry_width + 1; i++)
grub_putcode (' ', term_screen->term);
}
static void
print_updown (int upflag, int downflag, struct per_term_screen *term_screen)
{
grub_term_gotoxy (term_screen->term,
(struct grub_term_coordinate) { term_screen->geo.first_entry_x
+ term_screen->geo.entry_width + 1
+ term_screen->geo.border,
term_screen->geo.first_entry_y });
if (upflag && downflag)
grub_putcode (GRUB_UNICODE_UPDOWNARROW, term_screen->term);
else if (upflag)
grub_putcode (GRUB_UNICODE_UPARROW, term_screen->term);
else if (downflag)
grub_putcode (GRUB_UNICODE_DOWNARROW, term_screen->term);
else
grub_putcode (' ', term_screen->term);
}
/* Print an up arrow. */
static void
print_up (int flag, struct per_term_screen *term_screen)
{
grub_term_gotoxy (term_screen->term,
(struct grub_term_coordinate) { term_screen->geo.first_entry_x
+ term_screen->geo.entry_width + 1
+ term_screen->geo.border,
term_screen->geo.first_entry_y });
if (flag)
grub_putcode (GRUB_UNICODE_UPARROW, term_screen->term);
else
grub_putcode (' ', term_screen->term);
}
/* Print a down arrow. */
static void
print_down (int flag, struct per_term_screen *term_screen)
{
grub_term_gotoxy (term_screen->term,
(struct grub_term_coordinate) { term_screen->geo.first_entry_x
+ term_screen->geo.entry_width + 1
+ term_screen->geo.border,
term_screen->geo.first_entry_y
+ term_screen->geo.num_entries - 1 });
if (flag)
grub_putcode (GRUB_UNICODE_DOWNARROW, term_screen->term);
else
grub_putcode (' ', term_screen->term);
}
/* Draw the lines of the screen SCREEN. */
static void
update_screen (struct screen *screen, struct per_term_screen *term_screen,
int region_start, int region_column __attribute__ ((unused)),
int up, int down, enum update_mode mode)
{
int up_flag = 0;
int down_flag = 0;
int y;
int i;
struct line *linep;
y = term_screen->y_line_start;
linep = screen->lines;
for (i = 0; i < screen->line; i++, linep++)
y += get_logical_num_lines (linep, term_screen);
linep = screen->lines + screen->line;
grub_size_t t = grub_getstringwidth (linep->buf, linep->buf + screen->column,
term_screen->term);
y += t / (unsigned) term_screen->geo.entry_width;
if (t % (unsigned) term_screen->geo.entry_width == 0
&& t != 0 && screen->column == linep->len)
y--;
/* Check if scrolling is necessary. */
if (y < 0 || y >= term_screen->geo.num_entries)
{
int delta;
if (y < 0)
delta = -y;
else
delta = term_screen->geo.num_entries - 1 - y;
term_screen->y_line_start += delta;
region_start = 0;
up = 1;
down = 1;
mode = ALL_LINES;
}
grub_term_setcursor (term_screen->term, 0);
if (mode != NO_LINE)
{
/* Draw lines. This code is tricky, because this must calculate logical
positions. */
y = term_screen->y_line_start;
i = 0;
linep = screen->lines;
while (1)
{
int add;
add = get_logical_num_lines (linep, term_screen);
if (y + add > 0)
break;
i++;
linep++;
y += add;
}
if (y < 0 || i > 0)
up_flag = 1;
do
{
struct grub_term_pos **pos;
if (linep >= screen->lines + screen->num_lines)
break;
pos = linep->pos + (term_screen - screen->terms);
if (!*pos)
*pos = grub_calloc (linep->len + 1, sizeof (**pos));
if (i == region_start || linep == screen->lines + screen->line
|| (i > region_start && mode == ALL_LINES))
{
grub_term_gotoxy (term_screen->term,
(struct grub_term_coordinate) { term_screen->geo.first_entry_x,
(y < 0 ? 0 : y)
+ term_screen->geo.first_entry_y });
grub_print_ucs4_menu (linep->buf,
linep->buf + linep->len,
term_screen->geo.first_entry_x,
term_screen->geo.right_margin,
term_screen->term,
(y < 0) ? -y : 0,
term_screen->geo.num_entries
- ((y > 0) ? y : 0), '\\',
*pos);
}
y += get_logical_num_lines (linep, term_screen);
if (y >= term_screen->geo.num_entries)
{
if (i + 1 < screen->num_lines)
down_flag = 1;
}
linep++;
i++;
if (mode == ALL_LINES && i == screen->num_lines)
for (; y < term_screen->geo.num_entries; y++)
print_empty_line (y, term_screen);
}
while (y < term_screen->geo.num_entries);
/* Draw up and down arrows. */
if (term_screen->geo.num_entries == 1)
{
if (up || down)
print_updown (up_flag, down_flag, term_screen);
}
else
{
if (up)
print_up (up_flag, term_screen);
if (down)
print_down (down_flag, term_screen);
}
}
/* Place the cursor. */
if (screen->lines[screen->line].pos[term_screen - screen->terms])
{
const struct grub_term_pos *cpos;
for (cpos = &(screen->lines[screen->line].pos[term_screen - screen->terms])[screen->column];
cpos >= &(screen->lines[screen->line].pos[term_screen - screen->terms])[0];
cpos--)
if (cpos->valid)
break;
y = term_screen->y_line_start;
for (i = 0; i < screen->line; i++)
y += get_logical_num_lines (screen->lines + i, term_screen);
if (cpos >= &(screen->lines[screen->line].pos[term_screen - screen->terms])[0])
grub_term_gotoxy (term_screen->term,
(struct grub_term_coordinate) { cpos->x + term_screen->geo.first_entry_x,
cpos->y + y
+ term_screen->geo.first_entry_y });
else
grub_term_gotoxy (term_screen->term,
(struct grub_term_coordinate) { term_screen->geo.first_entry_x,
y + term_screen->geo.first_entry_y });
}
grub_term_setcursor (term_screen->term, 1);
grub_term_refresh (term_screen->term);
}
static void
update_screen_all (struct screen *screen,
int region_start, int region_column,
int up, int down, enum update_mode mode)
{
unsigned i;
for (i = 0; i < screen->nterms; i++)
update_screen (screen, &screen->terms[i], region_start, region_column,
up, down, mode);
}
static int
insert_string (struct screen *screen, const char *s, int update)
{
int region_start = screen->num_lines;
int region_column = 0;
unsigned i;
for (i = 0; i < screen->nterms; i++)
{
screen->terms[i].down = 0;
screen->terms[i].mode = NO_LINE;
}
while (*s)
{
if (*s == '\n')
{
/* LF is special because it creates a new line. */
struct line *current_linep;
struct line *next_linep;
int size;
/* Make a new line. */
screen->num_lines++;
screen->lines = grub_realloc (screen->lines,
screen->num_lines
* sizeof (screen->lines[0]));
if (! screen->lines)
return 0;
/* Shift down if not appending after the last line. */
if (screen->line < screen->num_lines - 2)
grub_memmove (screen->lines + screen->line + 2,
screen->lines + screen->line + 1,
((screen->num_lines - screen->line - 2)
* sizeof (struct line)));
if (! init_line (screen, screen->lines + screen->line + 1))
return 0;
/* Fold the line. */
current_linep = screen->lines + screen->line;
next_linep = current_linep + 1;
size = current_linep->len - screen->column;
if (! ensure_space (next_linep, size))
return 0;
grub_memmove (next_linep->buf,
current_linep->buf + screen->column,
size * sizeof (next_linep->buf[0]));
current_linep->len = screen->column;
for (i = 0; i < screen->nterms; i++)
{
grub_free (current_linep->pos[i]);
current_linep->pos[i] = 0;
}
next_linep->len = size;
/* Update a dirty region. */
if (region_start > screen->line)
{
region_start = screen->line;
region_column = screen->column;
}
for (i = 0; i < screen->nterms; i++)
{
screen->terms[i].mode = ALL_LINES;
screen->terms[i].down = 1; /* XXX not optimal. */
}
/* Move the cursor. */
screen->column = screen->real_column = 0;
screen->line++;
s++;
}
else
{
/* All but LF. */
const char *p;
struct line *current_linep;
int size;
grub_uint32_t *unicode_msg;
/* Find a string delimited by LF. */
p = grub_strchr (s, '\n');
if (! p)
p = s + grub_strlen (s);
/* Insert the string. */
current_linep = screen->lines + screen->line;
unicode_msg = grub_calloc (p - s, sizeof (grub_uint32_t));
if (!unicode_msg)
return 0;
size = grub_utf8_to_ucs4 (unicode_msg, (p - s),
(grub_uint8_t *) s, (p - s), 0);
if (! ensure_space (current_linep, size))
{
grub_free (unicode_msg);
return 0;
}
grub_memmove (current_linep->buf + screen->column + size,
current_linep->buf + screen->column,
(current_linep->len - screen->column)
* sizeof (current_linep->buf[0]));
grub_memmove (current_linep->buf + screen->column,
unicode_msg,
size * sizeof (current_linep->buf[0]));
grub_free (unicode_msg);
for (i = 0; i < screen->nterms; i++)
{
grub_free (current_linep->pos[i]);
current_linep->pos[i] = 0;
}
for (i = 0; i < screen->nterms; i++)
screen->terms[i].orig_num = get_logical_num_lines (current_linep,
&screen->terms[i]);
current_linep->len += size;
/* Update the dirty region. */
if (region_start > screen->line)
{
region_start = screen->line;
region_column = screen->column;
}
for (i = 0; i < screen->nterms; i++)
{
int new_num = get_logical_num_lines (current_linep,
&screen->terms[i]);
if (screen->terms[i].orig_num != new_num)
{
screen->terms[i].mode = ALL_LINES;
screen->terms[i].down = 1; /* XXX not optimal. */
}
else if (screen->terms[i].mode != ALL_LINES)
screen->terms[i].mode = SINGLE_LINE;
}
/* Move the cursor. */
advance_to (screen, screen->column + size);
screen->real_column = screen->column;
s = p;
}
}
if (update)
for (i = 0; i < screen->nterms; i++)
update_screen (screen, &screen->terms[i],
region_start, region_column, 0, screen->terms[i].down,
screen->terms[i].mode);
return 1;
}
/* Release the resource allocated for SCREEN. */
static void
destroy_screen (struct screen *screen)
{
int i;
if (screen->lines)
for (i = 0; i < screen->num_lines; i++)
{
struct line *linep = screen->lines + i;
if (linep)
{
unsigned j;
if (linep->pos)
for (j = 0; j < screen->nterms; j++)
grub_free (linep->pos[j]);
grub_free (linep->buf);
grub_free (linep->pos);
}
}
grub_free (screen->killed_text);
grub_free (screen->lines);
grub_free (screen->terms);
grub_free (screen);
}
/* Make a new screen. */
static struct screen *
make_screen (grub_menu_entry_t entry)
{
struct screen *screen;
unsigned i;
/* Initialize the screen. */
screen = grub_zalloc (sizeof (*screen));
if (! screen)
return 0;
screen->submenu = entry->submenu;
screen->num_lines = 1;
screen->lines = grub_malloc (sizeof (struct line));
if (! screen->lines)
goto fail;
/* Initialize the first line which must be always present. */
if (! init_line (screen, screen->lines))
goto fail;
insert_string (screen, (char *) entry->sourcecode, 0);
/* Reset the cursor position. */
screen->column = 0;
screen->real_column = 0;
screen->line = 0;
for (i = 0; i < screen->nterms; i++)
{
screen->terms[i].y_line_start = 0;
}
return screen;
fail:
destroy_screen (screen);
return 0;
}
static int
forward_char (struct screen *screen, int update)
{
struct line *linep;
linep = screen->lines + screen->line;
if (screen->column < linep->len)
{
screen->column = grub_unicode_get_comb_end (screen->lines[screen->line].buf
+ screen->lines[screen->line].len,
screen->lines[screen->line].buf
+ screen->column + 1)
- screen->lines[screen->line].buf;
}
else if (screen->num_lines > screen->line + 1)
{
screen->column = 0;
screen->line++;
}
screen->real_column = screen->column;
if (update)
update_screen_all (screen, screen->num_lines, 0, 0, 0, NO_LINE);
return 1;
}
static int
backward_char (struct screen *screen, int update)
{
if (screen->column > 0)
{
struct grub_unicode_glyph glyph;
struct line *linep;
linep = screen->lines + screen->line;
screen->column--;
screen->column = grub_unicode_get_comb_start (linep->buf,
linep->buf + screen->column)
- linep->buf;
grub_unicode_aglomerate_comb (screen->lines[screen->line].buf + screen->column,
screen->lines[screen->line].len - screen->column,
&glyph);
screen->column = grub_unicode_get_comb_start (linep->buf,
linep->buf + screen->column)
- linep->buf;
grub_unicode_destroy_glyph (&glyph);
}
else if (screen->line > 0)
{
screen->line--;
screen->column = screen->lines[screen->line].len;
}
screen->real_column = screen->column;
if (update)
update_screen_all (screen, screen->num_lines, 0, 0, 0, NO_LINE);
return 1;
}
static int
previous_line (struct screen *screen, int update)
{
if (screen->line > 0)
{
struct line *linep;
int col;
screen->line--;
linep = screen->lines + screen->line;
if (linep->len < screen->real_column)
col = linep->len;
else
col = screen->real_column;
screen->column = 0;
advance_to (screen, col);
}
else
{
screen->column = 0;
}
if (update)
update_screen_all (screen, screen->num_lines, 0, 0, 0, NO_LINE);
return 1;
}
static int
next_line (struct screen *screen, int update)
{
if (screen->line < screen->num_lines - 1)
{
struct line *linep;
int c;
/* How many physical lines from the current position
to the last physical line? */
linep = screen->lines + screen->line;
screen->line++;
if ((linep + 1)->len < screen->real_column)
c = (linep + 1)->len;
else
c = screen->real_column;
screen->column = 0;
advance_to (screen, c);
}
else
advance_to (screen, screen->lines[screen->line].len);
if (update)
update_screen_all (screen, screen->num_lines, 0, 0, 0, NO_LINE);
return 1;
}
static int
beginning_of_line (struct screen *screen, int update)
{
screen->column = screen->real_column = 0;
if (update)
update_screen_all (screen, screen->num_lines, 0, 0, 0, NO_LINE);
return 1;
}
static int
end_of_line (struct screen *screen, int update)
{
advance_to (screen, screen->lines[screen->line].len);
if (update)
update_screen_all (screen, screen->num_lines, 0, 0, 0, NO_LINE);
return 1;
}
static int
delete_char (struct screen *screen, int update)
{
struct line *linep;
int start = screen->num_lines;
int column = 0;
linep = screen->lines + screen->line;
if (linep->len > screen->column)
{
unsigned i;
for (i = 0; i < screen->nterms; i++)
screen->terms[i].orig_num = get_logical_num_lines (linep, &screen->terms[i]);
grub_memmove (linep->buf + screen->column,
linep->buf + screen->column + 1,
(linep->len - screen->column - 1)
* sizeof (linep->buf[0]));
linep->len--;
for (i = 0; i < screen->nterms; i++)
{
grub_free (linep->pos[i]);
linep->pos[i] = 0;
}
start = screen->line;
column = screen->column;
screen->real_column = screen->column;
if (update)
{
for (i = 0; i < screen->nterms; i++)
{
int new_num;
new_num = get_logical_num_lines (linep, &screen->terms[i]);
if (screen->terms[i].orig_num != new_num)
update_screen (screen, &screen->terms[i],
start, column, 0, 0, ALL_LINES);
else
update_screen (screen, &screen->terms[i],
start, column, 0, 0, SINGLE_LINE);
}
}
}
else if (screen->num_lines > screen->line + 1)
{
struct line *next_linep;
unsigned i;
next_linep = linep + 1;
if (! ensure_space (linep, next_linep->len))
return 0;
grub_memmove (linep->buf + linep->len, next_linep->buf,
next_linep->len * sizeof (linep->buf[0]));
linep->len += next_linep->len;
for (i = 0; i < screen->nterms; i++)
{
grub_free (linep->pos[i]);
linep->pos[i] = 0;
}
grub_free (next_linep->buf);
grub_memmove (next_linep,
next_linep + 1,
(screen->num_lines - screen->line - 2)
* sizeof (struct line));
screen->num_lines--;
start = screen->line;
column = screen->column;
screen->real_column = screen->column;
if (update)
update_screen_all (screen, start, column, 0, 1, ALL_LINES);
}
return 1;
}
static int
backward_delete_char (struct screen *screen, int update)
{
int saved_column;
int saved_line;
saved_column = screen->column;
saved_line = screen->line;
if (! backward_char (screen, 0))
return 0;
if (saved_column != screen->column || saved_line != screen->line)
if (! delete_char (screen, update))
return 0;
return 1;
}
static int
kill_line (struct screen *screen, int continuous, int update)
{
struct line *linep;
char *p;
int size;
int offset;
p = screen->killed_text;
if (! continuous && p)
p[0] = '\0';
linep = screen->lines + screen->line;
size = linep->len - screen->column;
if (p)
offset = grub_strlen (p);
else
offset = 0;
if (size > 0)
{
unsigned i;
p = grub_realloc (p, offset + size + 1);
if (! p)
return 0;
grub_memmove (p + offset, linep->buf + screen->column, size);
p[offset + size] = '\0';
screen->killed_text = p;
for (i = 0; i < screen->nterms; i++)
screen->terms[i].orig_num = get_logical_num_lines (linep, &screen->terms[i]);
linep->len = screen->column;
if (update)
{
for (i = 0; i < screen->nterms; i++)
{
int new_num;
new_num = get_logical_num_lines (linep, &screen->terms[i]);
if (screen->terms[i].orig_num != new_num)
update_screen (screen, &screen->terms[i],
screen->line, screen->column, 0, 1, ALL_LINES);
else
update_screen (screen, &screen->terms[i],
screen->line, screen->column, 0, 0, SINGLE_LINE);
}
}
}
else if (screen->line + 1 < screen->num_lines)
{
p = grub_realloc (p, offset + 1 + 1);
if (! p)
return 0;
p[offset] = '\n';
p[offset + 1] = '\0';
screen->killed_text = p;
return delete_char (screen, update);
}
return 1;
}
static int
yank (struct screen *screen, int update)
{
if (screen->killed_text)
return insert_string (screen, screen->killed_text, update);
return 1;
}
static int
open_line (struct screen *screen, int update)
{
if (! insert_string (screen, "\n", 0))
return 0;
if (! backward_char (screen, 0))
return 0;
if (update)
update_screen_all (screen, screen->line, screen->column, 0, 1, ALL_LINES);
return 1;
}
/* A completion hook to print items. */
static void
store_completion (const char *item, grub_completion_type_t type,
int count __attribute__ ((unused)))
{
char *p;
completion_type = type;
/* Make sure that the completion buffer has enough room. */
if (completion_buffer.max_len < (completion_buffer.len
+ (int) grub_strlen (item) + 1 + 1))
{
grub_size_t new_len;
new_len = completion_buffer.len + grub_strlen (item) + 80;
p = grub_realloc (completion_buffer.buf, new_len);
if (! p)
{
/* Possibly not fatal. */
grub_errno = GRUB_ERR_NONE;
return;
}
p[completion_buffer.len] = 0;
completion_buffer.buf = p;
completion_buffer.max_len = new_len;
}
p = completion_buffer.buf + completion_buffer.len;
if (completion_buffer.len != 0)
{
*p++ = ' ';
completion_buffer.len++;
}
grub_strcpy (p, item);
completion_buffer.len += grub_strlen (item);
}
static int
complete (struct screen *screen, int continuous, int update)
{
struct line *linep;
int restore;
char *insert;
static int count = -1;
unsigned i;
grub_uint32_t *ucs4;
grub_size_t buflen;
grub_ssize_t ucs4len;
char *u8;
if (continuous)
count++;
else
count = 0;
completion_buffer.buf = 0;
completion_buffer.len = 0;
completion_buffer.max_len = 0;
linep = screen->lines + screen->line;
u8 = grub_ucs4_to_utf8_alloc (linep->buf, screen->column);
if (!u8)
return 1;
insert = grub_normal_do_completion (u8, &restore, store_completion);
if (completion_buffer.buf)
{
buflen = grub_strlen (completion_buffer.buf);
ucs4 = grub_calloc (buflen + 1, sizeof (grub_uint32_t));
if (!ucs4)
{
grub_print_error ();
grub_errno = GRUB_ERR_NONE;
return 1;
}
ucs4len = grub_utf8_to_ucs4 (ucs4, buflen,
(grub_uint8_t *) completion_buffer.buf,
buflen, 0);
ucs4[ucs4len] = 0;
if (restore)
for (i = 0; i < screen->nterms; i++)
{
unsigned width = grub_term_width (screen->terms[i].term);
if (width > 2)
width -= 2;
if (width > 15)
width -= 6;
unsigned num_sections = ((completion_buffer.len
+ width - 1)
/ width);
grub_uint32_t *endp;
struct grub_term_coordinate pos;
grub_uint32_t *p = ucs4;
pos = grub_term_getxy (screen->terms[i].term);
screen->completion_shown = 1;
grub_term_gotoxy (screen->terms[i].term,
(struct grub_term_coordinate) { 0,
screen->terms[i].geo.timeout_y });
if (screen->terms[i].geo.timeout_lines >= 2)
{
grub_puts_terminal (" ", screen->terms[i].term);
switch (completion_type)
{
case GRUB_COMPLETION_TYPE_COMMAND:
grub_puts_terminal (_("Possible commands are:"),
screen->terms[i].term);
break;
case GRUB_COMPLETION_TYPE_DEVICE:
grub_puts_terminal (_("Possible devices are:"),
screen->terms[i].term);
break;
case GRUB_COMPLETION_TYPE_FILE:
grub_puts_terminal (_("Possible files are:"),
screen->terms[i].term);
break;
case GRUB_COMPLETION_TYPE_PARTITION:
grub_puts_terminal (_("Possible partitions are:"),
screen->terms[i].term);
break;
case GRUB_COMPLETION_TYPE_ARGUMENT:
grub_puts_terminal (_("Possible arguments are:"),
screen->terms[i].term);
break;
default:
grub_puts_terminal (_("Possible things are:"),
screen->terms[i].term);
break;
}
grub_puts_terminal ("\n ", screen->terms[i].term);
}
p += ((unsigned) count % num_sections) * width;
endp = p + width;
if (p != ucs4)
grub_putcode (GRUB_UNICODE_LEFTARROW, screen->terms[i].term);
else
grub_putcode (' ', screen->terms[i].term);
grub_print_ucs4 (p, ucs4 + ucs4len < endp ? ucs4 + ucs4len : endp,
0, 0, screen->terms[i].term);
if (ucs4 + ucs4len > endp)
grub_putcode (GRUB_UNICODE_RIGHTARROW, screen->terms[i].term);
grub_term_gotoxy (screen->terms[i].term, pos);
}
}
if (insert)
{
insert_string (screen, insert, update);
count = -1;
grub_free (insert);
}
else if (update)
grub_refresh ();
grub_free (completion_buffer.buf);
return 1;
}
/* Clear displayed completions. */
static void
clear_completions (struct per_term_screen *term_screen)
{
struct grub_term_coordinate pos;
unsigned j;
int i;
pos = grub_term_getxy (term_screen->term);
grub_term_gotoxy (term_screen->term,
(struct grub_term_coordinate) { 0,
term_screen->geo.timeout_y });
for (i = 0; i < term_screen->geo.timeout_lines; i++)
{
for (j = 0; j < grub_term_width (term_screen->term) - 1; j++)
grub_putcode (' ', term_screen->term);
if (i + 1 < term_screen->geo.timeout_lines)
grub_putcode ('\n', term_screen->term);
}
grub_term_gotoxy (term_screen->term, pos);
grub_term_refresh (term_screen->term);
}
static void
clear_completions_all (struct screen *screen)
{
unsigned i;
for (i = 0; i < screen->nterms; i++)
clear_completions (&screen->terms[i]);
}
/* Execute the command list in the screen SCREEN. */
static int
run (struct screen *screen)
{
char *script;
int errs_before;
grub_menu_t menu = NULL;
char *dummy[1] = { NULL };
grub_cls ();
grub_printf (" ");
grub_printf_ (N_("Booting a command list"));
grub_printf ("\n\n");
errs_before = grub_err_printed_errors;
if (screen->submenu)
{
grub_env_context_open ();
menu = grub_zalloc (sizeof (*menu));
if (! menu)
return 0;
grub_env_set_menu (menu);
}
/* Execute the script, line for line. */
{
int i;
grub_size_t size = 0, tot_size = 0;
for (i = 0; i < screen->num_lines; i++)
tot_size += grub_get_num_of_utf8_bytes (screen->lines[i].buf,
screen->lines[i].len) + 1;
script = grub_malloc (tot_size + 1);
if (! script)
return 0;
for (i = 0; i < screen->num_lines; i++)
{
size += grub_ucs4_to_utf8 (screen->lines[i].buf, screen->lines[i].len,
(grub_uint8_t *) script + size,
tot_size - size);
script[size++] = '\n';
}
script[size] = '\0';
}
grub_script_execute_new_scope (script, 0, dummy);
grub_free (script);
if (errs_before != grub_err_printed_errors)
grub_wait_after_message ();
if (grub_errno == GRUB_ERR_NONE && grub_loader_is_loaded ())
/* Implicit execution of boot, only if something is loaded. */
grub_command_execute ("boot", 0, 0);
if (screen->submenu)
{
if (menu && menu->size)
{
grub_show_menu (menu, 1, 0);
grub_normal_free_menu (menu);
}
grub_env_context_close ();
}
if (grub_errno != GRUB_ERR_NONE)
{
grub_print_error ();
grub_errno = GRUB_ERR_NONE;
grub_wait_after_message ();
}
return 1;
}
/* Edit a menu entry with an Emacs-like interface. */
void
grub_menu_entry_run (grub_menu_entry_t entry)
{
struct screen *screen;
int prev_c;
grub_err_t err = GRUB_ERR_NONE;
unsigned i;
grub_term_output_t term;
err = grub_auth_check_authentication (NULL);
if (err)
{
grub_print_error ();
grub_errno = GRUB_ERR_NONE;
return;
}
screen = make_screen (entry);
if (! screen)
return;
screen->terms = NULL;
refresh:
grub_free (screen->terms);
screen->nterms = 0;
FOR_ACTIVE_TERM_OUTPUTS(term)
screen->nterms++;
for (i = 0; i < (unsigned) screen->num_lines; i++)
{
grub_free (screen->lines[i].pos);
screen->lines[i].pos = grub_calloc (screen->nterms, sizeof (screen->lines[i].pos[0]));
if (! screen->lines[i].pos)
{
grub_print_error ();
destroy_screen (screen);
grub_errno = GRUB_ERR_NONE;
return;
}
}
screen->terms = grub_calloc (screen->nterms, sizeof (screen->terms[0]));
if (!screen->terms)
{
grub_print_error ();
destroy_screen (screen);
grub_errno = GRUB_ERR_NONE;
return;
}
i = 0;
FOR_ACTIVE_TERM_OUTPUTS(term)
{
screen->terms[i].term = term;
screen->terms[i].y_line_start = 0;
i++;
}
/* Draw the screen. */
for (i = 0; i < screen->nterms; i++)
grub_menu_init_page (0, 1, &screen->terms[i].geo,
screen->terms[i].term);
update_screen_all (screen, 0, 0, 1, 1, ALL_LINES);
for (i = 0; i < screen->nterms; i++)
grub_term_setcursor (screen->terms[i].term, 1);
prev_c = '\0';
while (1)
{
int c = grub_getkey ();
if (screen->completion_shown)
{
clear_completions_all (screen);
screen->completion_shown = 0;
}
if (grub_normal_exit_level)
{
destroy_screen (screen);
return;
}
switch (c)
{
case GRUB_TERM_KEY_UP:
case GRUB_TERM_CTRL | 'p':
if (! previous_line (screen, 1))
goto fail;
break;
case GRUB_TERM_CTRL | 'n':
case GRUB_TERM_KEY_DOWN:
if (! next_line (screen, 1))
goto fail;
break;
case GRUB_TERM_CTRL | 'f':
case GRUB_TERM_KEY_RIGHT:
if (! forward_char (screen, 1))
goto fail;
break;
case GRUB_TERM_CTRL | 'b':
case GRUB_TERM_KEY_LEFT:
if (! backward_char (screen, 1))
goto fail;
break;
case GRUB_TERM_CTRL | 'a':
case GRUB_TERM_KEY_HOME:
if (! beginning_of_line (screen, 1))
goto fail;
break;
case GRUB_TERM_CTRL | 'e':
case GRUB_TERM_KEY_END:
if (! end_of_line (screen, 1))
goto fail;
break;
case GRUB_TERM_CTRL | 'i':
case '\t':
if (! complete (screen, prev_c == c, 1))
goto fail;
break;
case GRUB_TERM_CTRL | 'd':
case GRUB_TERM_KEY_DC:
if (! delete_char (screen, 1))
goto fail;
break;
case GRUB_TERM_CTRL | 'h':
case '\b':
if (! backward_delete_char (screen, 1))
goto fail;
break;
case GRUB_TERM_CTRL | 'k':
if (! kill_line (screen, prev_c == c, 1))
goto fail;
break;
case GRUB_TERM_CTRL | 'u':
/* FIXME: What behavior is good for this key? */
break;
case GRUB_TERM_CTRL | 'y':
if (! yank (screen, 1))
goto fail;
break;
case GRUB_TERM_CTRL | 'l':
/* FIXME: centering. */
goto refresh;
case GRUB_TERM_CTRL | 'o':
if (! open_line (screen, 1))
goto fail;
break;
case '\n':
case '\r':
if (! insert_string (screen, "\n", 1))
goto fail;
break;
case GRUB_TERM_ESC:
destroy_screen (screen);
return;
case GRUB_TERM_CTRL | 'c':
case GRUB_TERM_KEY_F2:
grub_cmdline_run (1, 0);
goto refresh;
case GRUB_TERM_CTRL | 'x':
case GRUB_TERM_KEY_F10:
run (screen);
goto refresh;
case GRUB_TERM_CTRL | 'r':
case GRUB_TERM_CTRL | 's':
case GRUB_TERM_CTRL | 't':
/* FIXME */
break;
default:
if (grub_isprint (c))
{
char buf[2];
buf[0] = c;
buf[1] = '\0';
if (! insert_string (screen, buf, 1))
goto fail;
}
break;
}
prev_c = c;
}
fail:
destroy_screen (screen);
grub_cls ();
grub_print_error ();
grub_errno = GRUB_ERR_NONE;
grub_xputs ("\n");
grub_printf_ (N_("Press any key to continue..."));
(void) grub_getkey ();
}
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