grub-core/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/time.h>
  25
  26 struct grub_term_output *grub_term_outputs_disabled;
  27 struct grub_term_input *grub_term_inputs_disabled;
  28 struct grub_term_output *grub_term_outputs;
  29 struct grub_term_input *grub_term_inputs;
  30
  31 void (*grub_term_poll_usb) (void) = NULL;
  32
  33 /* Put a Unicode character.  */
  34 static void
  35 grub_putcode_dumb (grub_uint32_t code,
  36                    struct grub_term_output *term)
  37 {
  38   struct grub_unicode_glyph c =
  39     {
  40       .base = code,
  41       .variant = 0,
  42       .attributes = 0,
  43       .ncomb = 0,
  44       .combining = 0,
  45       .estimated_width = 1
  46     };
  47
  48   if (code == '\t' && term->getxy)
  49     {
  50       int n;
  51
  52       n = 8 - ((term->getxy (term) >> 8) & 7);
  53       while (n--)
  54         grub_putcode_dumb (' ', term);
  55
  56       return;
  57     }
  58
  59   (term->putchar) (term, &c);
  60   if (code == '\n')
  61     grub_putcode_dumb ('\r', term);
  62 }
  63
  64 static void
  65 grub_xputs_dumb (const char *str)
  66 {
  67   for (; *str; str++)
  68     {
  69       grub_term_output_t term;
  70       grub_uint32_t code = *str;
  71       if (code > 0x7f)
  72         code = '?';
  73
  74       FOR_ACTIVE_TERM_OUTPUTS(term)
  75         grub_putcode_dumb (code, term);
  76     }
  77 }
  78
  79 void (*grub_xputs) (const char *str) = grub_xputs_dumb;
  80
  81 static int pending_key = GRUB_TERM_NO_KEY;
  82
  83 int
  84 grub_checkkey (void)
  85 {
  86   grub_term_input_t term;
  87
  88   if (pending_key != GRUB_TERM_NO_KEY)
  89     return pending_key;
  90
  91   if (grub_term_poll_usb)
  92     grub_term_poll_usb ();
  93
  94   FOR_ACTIVE_TERM_INPUTS(term)
  95   {
  96     pending_key = term->getkey (term);
  97     if (pending_key != GRUB_TERM_NO_KEY)
  98       return pending_key;
  99   }
 100
 101   return -1;
 102 }
 103
 104 int
 105 grub_getkey (void)
 106 {
 107   int ret;
 108
 109   grub_refresh ();
 110
 111   grub_checkkey ();
 112   while (pending_key == GRUB_TERM_NO_KEY)
 113     {
 114       grub_cpu_idle ();
 115       grub_checkkey ();
 116     }
 117   ret = pending_key;
 118   pending_key = GRUB_TERM_NO_KEY;
 119   return ret;
 120 }
 121
 122
 123 void
 124 grub_refresh (void)
 125 {
 126   struct grub_term_output *term;
 127
 128   FOR_ACTIVE_TERM_OUTPUTS(term)
 129     grub_term_refresh (term);
 130 }