308 lines
6.9 KiB
C
308 lines
6.9 KiB
C
/* terminfo.c - simple terminfo module */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003,2004,2005,2007 Free Software Foundation, Inc.
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*
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* GRUB 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 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* This file contains various functions dealing with different
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* terminal capabilities. For example, vt52 and vt100.
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*/
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#include <grub/types.h>
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#include <grub/misc.h>
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#include <grub/mm.h>
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#include <grub/err.h>
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#include <grub/dl.h>
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#include <grub/term.h>
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#include <grub/terminfo.h>
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#include <grub/tparm.h>
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#include <grub/command.h>
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#include <grub/i18n.h>
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#include <grub/time.h>
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struct terminfo
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{
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char *name;
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char *gotoxy;
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char *cls;
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char *reverse_video_on;
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char *reverse_video_off;
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char *cursor_on;
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char *cursor_off;
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};
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static struct terminfo term;
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/* Get current terminfo name. */
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char *
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grub_terminfo_get_current (void)
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{
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return term.name;
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}
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/* Free *PTR and set *PTR to NULL, to prevent double-free. */
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static void
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grub_terminfo_free (char **ptr)
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{
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grub_free (*ptr);
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*ptr = 0;
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}
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/* Set current terminfo type. */
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grub_err_t
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grub_terminfo_set_current (const char *str)
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{
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/* TODO
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* Lookup user specified terminfo type. If found, set term variables
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* as appropriate. Otherwise return an error.
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*
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* How should this be done?
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* a. A static table included in this module.
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* - I do not like this idea.
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* b. A table stored in the configuration directory.
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* - Users must convert their terminfo settings if we have not already.
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* c. Look for terminfo files in the configuration directory.
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* - /usr/share/terminfo is 6.3M on my system.
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* - /usr/share/terminfo is not on most users boot partition.
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* + Copying the terminfo files you want to use to the grub
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* configuration directory is easier then (b).
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* d. Your idea here.
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*/
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/* Free previously allocated memory. */
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grub_terminfo_free (&term.name);
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grub_terminfo_free (&term.gotoxy);
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grub_terminfo_free (&term.cls);
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grub_terminfo_free (&term.reverse_video_on);
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grub_terminfo_free (&term.reverse_video_off);
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grub_terminfo_free (&term.cursor_on);
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grub_terminfo_free (&term.cursor_off);
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if (grub_strcmp ("vt100", str) == 0)
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{
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term.name = grub_strdup ("vt100");
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term.gotoxy = grub_strdup ("\e[%i%p1%d;%p2%dH");
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term.cls = grub_strdup ("\e[H\e[J");
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term.reverse_video_on = grub_strdup ("\e[7m");
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term.reverse_video_off = grub_strdup ("\e[m");
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term.cursor_on = grub_strdup ("\e[?25h");
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term.cursor_off = grub_strdup ("\e[?25l");
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return grub_errno;
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}
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "unknown terminfo type");
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}
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/* Wrapper for grub_putchar to write strings. */
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static void
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putstr (const char *str, grub_term_output_t oterm)
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{
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while (*str)
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{
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struct grub_unicode_glyph c =
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{
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.base = *str++,
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.variant = 0,
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.attributes = 0,
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.ncomb = 0,
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.combining = 0
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};
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oterm->putchar (&c);
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}
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}
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/* Move the cursor to the given position starting with "0". */
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void
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grub_terminfo_gotoxy (grub_uint8_t x, grub_uint8_t y, grub_term_output_t oterm)
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{
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putstr (grub_terminfo_tparm (term.gotoxy, y, x), oterm);
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}
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/* Clear the screen. */
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void
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grub_terminfo_cls (grub_term_output_t oterm)
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{
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putstr (grub_terminfo_tparm (term.cls), oterm);
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}
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/* Set reverse video mode on. */
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void
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grub_terminfo_reverse_video_on (grub_term_output_t oterm)
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{
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putstr (grub_terminfo_tparm (term.reverse_video_on), oterm);
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}
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/* Set reverse video mode off. */
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void
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grub_terminfo_reverse_video_off (grub_term_output_t oterm)
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{
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putstr (grub_terminfo_tparm (term.reverse_video_off), oterm);
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}
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/* Show cursor. */
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void
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grub_terminfo_cursor_on (grub_term_output_t oterm)
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{
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putstr (grub_terminfo_tparm (term.cursor_on), oterm);
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}
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/* Hide cursor. */
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void
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grub_terminfo_cursor_off (grub_term_output_t oterm)
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{
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putstr (grub_terminfo_tparm (term.cursor_off), oterm);
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}
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#define ANSI_C0 0x9b
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void
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grub_terminfo_readkey (int *keys, int *len, int (*readkey) (void))
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{
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int c;
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#define CONTINUE_READ \
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{ \
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grub_uint64_t start; \
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/* On 9600 we have to wait up to 12 milliseconds. */ \
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start = grub_get_time_ms (); \
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do \
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c = readkey (); \
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while (c == -1 && grub_get_time_ms () - start < 12); \
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if (c == -1) \
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return; \
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\
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keys[*len] = c; \
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(*len)++; \
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}
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c = readkey ();
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if (c < 0)
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{
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*len = 0;
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return;
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}
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*len = 1;
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keys[0] = c;
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if (c != ANSI_C0 && c != '\e')
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{
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/* Backspace: Ctrl-h. */
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if (c == 0x7f)
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c = '\b';
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*len = 1;
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keys[0] = c;
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return;
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}
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{
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static struct
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{
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char key;
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char ascii;
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}
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three_code_table[] =
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{
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{'4', GRUB_TERM_DC},
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{'A', GRUB_TERM_UP},
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{'B', GRUB_TERM_DOWN},
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{'C', GRUB_TERM_RIGHT},
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{'D', GRUB_TERM_LEFT},
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{'F', GRUB_TERM_END},
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{'H', GRUB_TERM_HOME},
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{'K', GRUB_TERM_END},
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{'P', GRUB_TERM_DC},
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{'?', GRUB_TERM_PPAGE},
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{'/', GRUB_TERM_NPAGE}
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};
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static struct
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{
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char key;
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char ascii;
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}
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four_code_table[] =
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{
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{'1', GRUB_TERM_HOME},
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{'3', GRUB_TERM_DC},
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{'5', GRUB_TERM_PPAGE},
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{'6', GRUB_TERM_NPAGE}
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};
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unsigned i;
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if (c == '\e')
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{
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CONTINUE_READ;
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if (c != '[')
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return;
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}
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CONTINUE_READ;
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for (i = 0; i < ARRAY_SIZE (three_code_table); i++)
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if (three_code_table[i].key == c)
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{
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keys[0] = three_code_table[i].ascii;
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*len = 1;
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return;
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}
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for (i = 0; i < ARRAY_SIZE (four_code_table); i++)
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if (four_code_table[i].key == c)
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{
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CONTINUE_READ;
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if (c != '~')
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return;
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keys[0] = three_code_table[i].ascii;
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*len = 1;
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return;
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}
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return;
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}
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#undef CONTINUE_READ
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}
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/* GRUB Command. */
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static grub_err_t
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grub_cmd_terminfo (grub_command_t cmd __attribute__ ((unused)),
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int argc, char **args)
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{
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if (argc == 0)
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{
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grub_printf ("Current terminfo type: %s\n", grub_terminfo_get_current());
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return GRUB_ERR_NONE;
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}
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else if (argc != 1)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "too many parameters");
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else
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return grub_terminfo_set_current (args[0]);
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}
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static grub_command_t cmd;
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GRUB_MOD_INIT(terminfo)
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{
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cmd = grub_register_command ("terminfo", grub_cmd_terminfo,
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N_("[TERM]"), N_("Set terminfo type."));
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grub_terminfo_set_current ("vt100");
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}
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GRUB_MOD_FINI(terminfo)
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{
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grub_unregister_command (cmd);
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}
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