normal/color.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 1999,2000,2001,2002,2003,2004,2008  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/misc.h>
  20 #include <grub/mm.h>
  21 #include <grub/normal.h>
  22 #include <grub/term.h>
  23
  24 /* Borrowed from GRUB Legacy */
  25 static char *color_list[16] =
  26 {
  27   "black",
  28   "blue",
  29   "green",
  30   "cyan",
  31   "red",
  32   "magenta",
  33   "brown",
  34   "light-gray",
  35   "dark-gray",
  36   "light-blue",
  37   "light-green",
  38   "light-cyan",
  39   "light-red",
  40   "light-magenta",
  41   "yellow",
  42   "white"
  43 };
  44
  45 static int
  46 parse_color_name (grub_uint8_t *ret, char *name)
  47 {
  48   grub_uint8_t i;
  49   for (i = 0; i < sizeof (color_list) / sizeof (*color_list); i++)
  50     if (! grub_strcmp (name, color_list[i]))
  51       {
  52         *ret = i;
  53         return 0;
  54       }
  55   return -1;
  56 }
  57
  58 void
  59 grub_parse_color_name_pair (grub_uint8_t *ret, const char *name)
  60 {
  61   grub_uint8_t fg, bg;
  62   char *fg_name, *bg_name;
  63
  64   /* nothing specified by user */
  65   if (name == NULL)
  66     return;
  67
  68   fg_name = grub_strdup (name);
  69   if (fg_name == NULL)
  70     {
  71       /* "out of memory" message was printed by grub_strdup() */
  72       grub_wait_after_message ();
  73       return;
  74     }
  75
  76   bg_name = grub_strchr (fg_name, '/');
  77   if (bg_name == NULL)
  78     {
  79       grub_printf ("Warning: syntax error (missing slash) in `%s'\n", fg_name);
  80       grub_wait_after_message ();
  81       goto free_and_return;
  82     }
  83
  84   *(bg_name++) = '\0';
  85
  86   if (parse_color_name (&fg, fg_name) == -1)
  87     {
  88       grub_printf ("Warning: invalid foreground color `%s'\n", fg_name);
  89       grub_wait_after_message ();
  90       goto free_and_return;
  91     }
  92   if (parse_color_name (&bg, bg_name) == -1)
  93     {
  94       grub_printf ("Warning: invalid background color `%s'\n", bg_name);
  95       grub_wait_after_message ();
  96       goto free_and_return;
  97     }
  98
  99   *ret = (bg << 4) | fg;
 100
 101 free_and_return:
 102   grub_free (fg_name);
 103 }
 104
 105 /* Replace default `normal' colors with the ones specified by user (if any).  */
 106 char *
 107 grub_env_write_color_normal (struct grub_env_var *var __attribute__ ((unused)),
 108                              const char *val)
 109 {
 110   grub_uint8_t color_normal, color_highlight;
 111
 112   /* Use old settings in case grub_parse_color_name_pair() has no effect.  */
 113   grub_getcolor (&color_normal, &color_highlight);
 114
 115   grub_parse_color_name_pair (&color_normal, val);
 116
 117   /* Reloads terminal `normal' and `highlight' colors.  */
 118   grub_setcolor (color_normal, color_highlight);
 119
 120   /* Propagates `normal' color to terminal current color.  */
 121   grub_setcolorstate (GRUB_TERM_COLOR_NORMAL);
 122
 123   return grub_strdup (val);
 124 }
 125
 126 /* Replace default `highlight' colors with the ones specified by user (if any).  */
 127 char *
 128 grub_env_write_color_highlight (struct grub_env_var *var __attribute__ ((unused)),
 129                                 const char *val)
 130 {
 131   grub_uint8_t color_normal, color_highlight;
 132
 133   /* Use old settings in case grub_parse_color_name_pair() has no effect.  */
 134   grub_getcolor (&color_normal, &color_highlight);
 135
 136   grub_parse_color_name_pair (&color_highlight, val);
 137
 138   /* Reloads terminal `normal' and `highlight' colors.  */
 139   grub_setcolor (color_normal, color_highlight);
 140
 141   /* Propagates `normal' color to terminal current color.
 142      Note: Using GRUB_TERM_COLOR_NORMAL here rather than
 143      GRUB_TERM_COLOR_HIGHLIGHT is intentional.  We don't want to switch
 144      to highlight state just because color was reloaded.  */
 145   grub_setcolorstate (GRUB_TERM_COLOR_NORMAL);
 146
 147   return grub_strdup (val);
 148 }