kern/term.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2002,2003,2005,2007,2008,2009  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/term.h>
  20 #include <grub/err.h>
  21 #include <grub/mm.h>
  22 #include <grub/misc.h>
  23 #include <grub/env.h>
  24 #include <grub/cpu/time.h>
  25
  26 struct grub_term_output *grub_term_outputs;
  27 struct grub_term_input *grub_term_inputs;
  28
  29 void (*grub_newline_hook) (void) = NULL;
  30
  31 /* Put a Unicode character.  */
  32 void
  33 grub_putcode (grub_uint32_t code, struct grub_term_output *term)
  34 {
  35   int height;
  36
  37   height = grub_term_height (term);
  38
  39   if (code == '\t' && term->getxy)
  40     {
  41       int n;
  42
  43       n = 8 - ((term->getxy () >> 8) & 7);
  44       while (n--)
  45         grub_putcode (' ', term);
  46
  47       return;
  48     }
  49
  50   if (code == '\n')
  51     (term->putchar) ('\r');
  52   (term->putchar) (code);
  53 }
  54
  55 /* Put a character. C is one byte of a UTF-8 stream.
  56    This function gathers bytes until a valid Unicode character is found.  */
  57 void
  58 grub_putchar (int c)
  59 {
  60   static grub_size_t size = 0;
  61   static grub_uint8_t buf[6];
  62   grub_uint32_t code;
  63   grub_ssize_t ret;
  64
  65   buf[size++] = c;
  66   ret = grub_utf8_to_ucs4 (&code, 1, buf, size, 0);
  67
  68   if (ret != 0)
  69     {
  70       struct grub_term_output *term;
  71       size = 0;
  72       FOR_ACTIVE_TERM_OUTPUTS(term)
  73         grub_putcode (code, term);
  74     }
  75   if (ret == '\n' && grub_newline_hook)
  76     grub_newline_hook ();
  77 }
  78
  79 int
  80 grub_getkey (void)
  81 {
  82   grub_term_input_t term;
  83
  84   while (1)
  85     {
  86       FOR_ACTIVE_TERM_INPUTS(term)
  87       {
  88         int key = term->checkkey ();
  89         if (key != -1)
  90           return term->getkey ();
  91       }
  92
  93       grub_cpu_idle ();
  94     }
  95 }
  96
  97 int
  98 grub_checkkey (void)
  99 {
 100   grub_term_input_t term;
 101
 102   FOR_ACTIVE_TERM_INPUTS(term)
 103   {
 104     int key = term->checkkey ();
 105     if (key != -1)
 106       return key;
 107   }
 108
 109   return -1;
 110 }
 111
 112 int
 113 grub_getkeystatus (void)
 114 {
 115   int status = 0;
 116   grub_term_input_t term;
 117
 118   FOR_ACTIVE_TERM_INPUTS(term)
 119   {
 120     if (term->getkeystatus)
 121       status |= term->getkeystatus ();
 122   }
 123
 124   return status;
 125 }
 126
 127 void
 128 grub_cls (void)
 129 {
 130   struct grub_term_output *term;
 131
 132   FOR_ACTIVE_TERM_OUTPUTS(term)
 133   {
 134     if ((term->flags & GRUB_TERM_DUMB) || (grub_env_get ("debug")))
 135       {
 136         grub_putcode ('\n', term);
 137         grub_refresh ();
 138       }
 139     else
 140       (term->cls) ();
 141   }
 142 }
 143
 144 void
 145 grub_setcolorstate (grub_term_color_state state)
 146 {
 147   struct grub_term_output *term;
 148
 149   FOR_ACTIVE_TERM_OUTPUTS(term)
 150     grub_term_setcolorstate (term, state);
 151 }
 152
 153 void
 154 grub_refresh (void)
 155 {
 156   struct grub_term_output *term;
 157
 158   FOR_ACTIVE_TERM_OUTPUTS(term)
 159     grub_term_refresh (term);
 160 }