505 lines
9.9 KiB
C
505 lines
9.9 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004,2005 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <grub/normal.h>
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#include <grub/misc.h>
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#include <grub/term.h>
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#include <grub/err.h>
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#include <grub/types.h>
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#include <grub/mm.h>
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#include <grub/partition.h>
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#include <grub/disk.h>
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#include <grub/file.h>
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#include <grub/env.h>
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static char *kill_buf;
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static int hist_size;
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static char **hist_lines = 0;
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static int hist_pos = 0;
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static int hist_end = 0;
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static int hist_used = 0;
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grub_err_t
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grub_set_history (int newsize)
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{
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char **old_hist_lines = hist_lines;
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hist_lines = grub_malloc (sizeof (char *) * newsize);
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/* Copy the old lines into the new buffer. */
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if (old_hist_lines)
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{
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/* Remove the lines that don't fit in the new buffer. */
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if (newsize < hist_used)
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{
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int i;
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int delsize = hist_used - newsize;
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hist_used = newsize;
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for (i = 1; i <= delsize; i++)
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{
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int pos = hist_end - i;
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if (pos < 0)
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pos += hist_size;
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grub_free (old_hist_lines[pos]);
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}
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hist_end -= delsize;
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if (hist_end < 0)
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hist_end += hist_size;
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}
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if (hist_pos < hist_end)
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grub_memmove (hist_lines, old_hist_lines + hist_pos,
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(hist_end - hist_pos) * sizeof (char *));
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else if (hist_used)
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{
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/* Copy the older part. */
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grub_memmove (hist_lines, old_hist_lines + hist_pos,
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(hist_size - hist_pos) * sizeof (char *));
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/* Copy the newer part. */
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grub_memmove (hist_lines + hist_size - hist_pos, old_hist_lines,
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hist_end * sizeof (char *));
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}
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}
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grub_free (old_hist_lines);
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hist_size = newsize;
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hist_pos = 0;
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hist_end = hist_used;
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return 0;
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}
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/* Get the entry POS from the history where `0' is the newest
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entry. */
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static char *
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grub_history_get (int pos)
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{
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pos = (hist_pos + pos) % hist_size;
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return hist_lines[pos];
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}
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/* Insert a new history line S on the top of the history. */
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static void
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grub_history_add (char *s)
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{
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/* Remove the oldest entry in the history to make room for a new
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entry. */
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if (hist_used + 1 > hist_size)
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{
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hist_end--;
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if (hist_end < 0)
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hist_end = hist_size + hist_end;
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grub_free (hist_lines[hist_end]);
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}
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else
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hist_used++;
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/* Move to the next position. */
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hist_pos--;
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if (hist_pos < 0)
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hist_pos = hist_size + hist_pos;
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/* Insert into history. */
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hist_lines[hist_pos] = grub_strdup (s);
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}
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/* Replace the history entry on position POS with the string S. */
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static void
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grub_history_replace (int pos, char *s)
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{
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pos = (hist_pos + pos) % hist_size;
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grub_free (hist_lines[pos]);
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hist_lines[pos] = grub_strdup (s);
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}
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void
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grub_cmdline_run (int nested)
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{
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grub_normal_init_page ();
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grub_setcursor (1);
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grub_printf ("\
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[ Minimal BASH-like line editing is supported. For the first word, TAB\n\
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lists possible command completions. Anywhere else TAB lists possible\n\
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device/file completions.%s ]\n\n",
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nested ? " ESC at any time exits." : "");
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while (1)
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{
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static char cmdline[GRUB_MAX_CMDLINE];
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grub_print_error ();
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grub_errno = GRUB_ERR_NONE;
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cmdline[0] = '\0';
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if (! grub_cmdline_get ("grub> ", cmdline, sizeof (cmdline), 0, 1)
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&& nested)
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return;
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if (! *cmdline)
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continue;
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grub_command_execute (cmdline, 1);
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}
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}
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/* A completion hook to print items. */
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static void
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print_completion (const char *item, grub_completion_type_t type, int count)
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{
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if (count == 0)
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{
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/* If this is the first time, print a label. */
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const char *what;
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switch (type)
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{
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case GRUB_COMPLETION_TYPE_COMMAND:
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what = "commands";
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break;
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case GRUB_COMPLETION_TYPE_DEVICE:
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what = "devices";
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break;
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case GRUB_COMPLETION_TYPE_FILE:
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what = "files";
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break;
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case GRUB_COMPLETION_TYPE_PARTITION:
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what = "partitions";
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break;
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default:
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what = "things";
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break;
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}
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grub_printf ("\nPossible %s are:\n", what);
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}
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if (type == GRUB_COMPLETION_TYPE_PARTITION)
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{
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grub_normal_print_device_info (item);
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grub_errno = GRUB_ERR_NONE;
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}
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else
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grub_printf (" %s", item);
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}
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/* Get a command-line. If ECHO_CHAR is not zero, echo it instead of input
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characters. If READLINE is non-zero, readline-like key bindings are
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available. If ESC is pushed, return zero, otherwise return non-zero. */
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/* FIXME: The dumb interface is not supported yet. */
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int
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grub_cmdline_get (const char *prompt, char cmdline[], unsigned max_len,
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int echo_char, int readline)
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{
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unsigned xpos, ypos, ystart;
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grub_size_t lpos, llen;
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grub_size_t plen;
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char buf[max_len];
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int key;
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int histpos = 0;
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auto void cl_insert (const char *str);
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auto void cl_delete (unsigned len);
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auto void cl_print (int pos, int c);
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auto void cl_set_pos (void);
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void cl_set_pos (void)
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{
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xpos = (plen + lpos) % 79;
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ypos = ystart + (plen + lpos) / 79;
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grub_gotoxy (xpos, ypos);
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}
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void cl_print (int pos, int c)
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{
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char *p;
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for (p = buf + pos; *p; p++)
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{
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if (xpos++ > 78)
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{
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grub_putchar ('\n');
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xpos = 1;
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if (ypos == (unsigned) (grub_getxy () & 0xFF))
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ystart--;
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else
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ypos++;
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}
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if (c)
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grub_putchar (c);
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else
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grub_putchar (*p);
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}
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}
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void cl_insert (const char *str)
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{
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grub_size_t len = grub_strlen (str);
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if (len + llen < max_len)
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{
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grub_memmove (buf + lpos + len, buf + lpos, llen - lpos + 1);
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grub_memmove (buf + lpos, str, len);
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llen += len;
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lpos += len;
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cl_print (lpos - len, echo_char);
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cl_set_pos ();
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}
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}
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void cl_delete (unsigned len)
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{
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if (lpos + len <= llen)
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{
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grub_size_t saved_lpos = lpos;
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lpos = llen - len;
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cl_set_pos ();
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cl_print (lpos, ' ');
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lpos = saved_lpos;
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cl_set_pos ();
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grub_memmove (buf + lpos, buf + lpos + len, llen - lpos + 1);
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llen -= len;
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cl_print (lpos, echo_char);
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cl_set_pos ();
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}
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}
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plen = grub_strlen (prompt);
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lpos = llen = 0;
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buf[0] = '\0';
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if ((grub_getxy () >> 8) != 0)
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grub_putchar ('\n');
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grub_printf (prompt);
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xpos = plen;
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ystart = ypos = (grub_getxy () & 0xFF);
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cl_insert (cmdline);
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if (hist_used == 0)
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grub_history_add (buf);
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while ((key = GRUB_TERM_ASCII_CHAR (grub_getkey ())) != '\n' && key != '\r')
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{
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if (readline)
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{
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switch (key)
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{
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case 1: /* Ctrl-a */
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lpos = 0;
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cl_set_pos ();
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break;
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case 2: /* Ctrl-b */
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if (lpos > 0)
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{
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lpos--;
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cl_set_pos ();
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}
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break;
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case 5: /* Ctrl-e */
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lpos = llen;
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cl_set_pos ();
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break;
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case 6: /* Ctrl-f */
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if (lpos < llen)
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{
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lpos++;
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cl_set_pos ();
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}
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break;
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case 9: /* Ctrl-i or TAB */
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{
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char *insert;
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int restore;
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/* Backup the next character and make it 0 so it will
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be easy to use string functions. */
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char backup = buf[lpos];
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buf[lpos] = '\0';
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insert = grub_normal_do_completion (buf, &restore,
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print_completion);
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/* Restore the original string. */
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buf[lpos] = backup;
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if (restore)
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{
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/* Restore the prompt. */
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grub_printf ("\n%s%s", prompt, buf);
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xpos = plen;
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ystart = ypos = (grub_getxy () & 0xFF);
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}
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if (insert)
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{
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cl_insert (insert);
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grub_free (insert);
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}
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}
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break;
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case 11: /* Ctrl-k */
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if (lpos < llen)
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{
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if (kill_buf)
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grub_free (kill_buf);
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kill_buf = grub_strdup (buf + lpos);
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grub_errno = GRUB_ERR_NONE;
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cl_delete (llen - lpos);
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}
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break;
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case 14: /* Ctrl-n */
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{
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char *hist;
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lpos = 0;
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if (histpos > 0)
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{
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grub_history_replace (histpos, buf);
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histpos--;
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}
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cl_delete (llen);
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hist = grub_history_get (histpos);
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cl_insert (hist);
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break;
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}
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case 16: /* Ctrl-p */
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{
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char *hist;
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lpos = 0;
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if (histpos < hist_used - 1)
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{
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grub_history_replace (histpos, buf);
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histpos++;
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}
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cl_delete (llen);
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hist = grub_history_get (histpos);
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cl_insert (hist);
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}
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break;
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case 21: /* Ctrl-u */
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if (lpos > 0)
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{
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grub_size_t n = lpos;
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if (kill_buf)
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grub_free (kill_buf);
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kill_buf = grub_malloc (n + 1);
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grub_errno = GRUB_ERR_NONE;
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if (kill_buf)
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{
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grub_memcpy (kill_buf, buf, n);
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kill_buf[n] = '\0';
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}
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lpos = 0;
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cl_set_pos ();
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cl_delete (n);
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}
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break;
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case 25: /* Ctrl-y */
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if (kill_buf)
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cl_insert (kill_buf);
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break;
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}
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}
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switch (key)
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{
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case '\e':
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return 0;
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case '\b':
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if (lpos > 0)
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{
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lpos--;
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cl_set_pos ();
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}
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else
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break;
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/* fall through */
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case 4: /* Ctrl-d */
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if (lpos < llen)
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cl_delete (1);
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break;
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default:
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if (grub_isprint (key))
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{
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char str[2];
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str[0] = key;
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str[1] = '\0';
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cl_insert (str);
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}
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break;
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}
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}
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grub_putchar ('\n');
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grub_refresh ();
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/* If ECHO_CHAR is NUL, remove leading spaces. */
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lpos = 0;
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if (! echo_char)
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while (buf[lpos] == ' ')
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lpos++;
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histpos = 0;
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if (grub_strlen (buf) > 0)
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{
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grub_history_replace (histpos, buf);
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grub_history_add ("");
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}
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grub_memcpy (cmdline, buf + lpos, llen - lpos + 1);
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return 1;
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}
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