lib/tty/color-internal.c

   1 /*
   2    Internal stuff of color setup
   3
   4    Copyright (C) 1994-2024
   5    Free Software Foundation, Inc.
   6
   7    Written by:
   8    Andrew Borodin <aborodin@vmail.ru>, 2009
   9    Slava Zanko <slavazanko@gmail.com>, 2009, 2013
  10    Egmont Koblinger <egmont@gmail.com>, 2010
  11
  12    This file is part of the Midnight Commander.
  13
  14    The Midnight Commander is free software: you can redistribute it
  15    and/or modify it under the terms of the GNU General Public License as
  16    published by the Free Software Foundation, either version 3 of the License,
  17    or (at your option) any later version.
  18
  19    The Midnight Commander is distributed in the hope that it will be useful,
  20    but WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22    GNU General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  26  */
  27
  28 /** \file color-internal.c
  29  *  \brief Source: Internal stuff of color setup
  30  */
  31
  32 #include <config.h>
  33
  34 #include <string.h>             /* strcmp */
  35
  36 #include "color.h"              /* colors and attributes */
  37 #include "color-internal.h"
  38
  39 /*** global variables ****************************************************************************/
  40
  41 gboolean mc_tty_color_disable;
  42
  43 /*** file scope macro definitions ****************************************************************/
  44
  45 #define COLOR_INTENSITY 8
  46
  47 /*** file scope type declarations ****************************************************************/
  48
  49 typedef struct mc_tty_color_table_struct
  50 {
  51     const char *name;
  52     int value;
  53 } mc_tty_color_table_t;
  54
  55 /*** forward declarations (file scope functions) *************************************************/
  56
  57 /*** file scope variables ************************************************************************/
  58
  59 static mc_tty_color_table_t const color_table[] = {
  60     {"black", COLOR_BLACK},
  61     {"gray", COLOR_BLACK + COLOR_INTENSITY},
  62     {"red", COLOR_RED},
  63     {"brightred", COLOR_RED + COLOR_INTENSITY},
  64     {"green", COLOR_GREEN},
  65     {"brightgreen", COLOR_GREEN + COLOR_INTENSITY},
  66     {"brown", COLOR_YELLOW},
  67     {"yellow", COLOR_YELLOW + COLOR_INTENSITY},
  68     {"blue", COLOR_BLUE},
  69     {"brightblue", COLOR_BLUE + COLOR_INTENSITY},
  70     {"magenta", COLOR_MAGENTA},
  71     {"brightmagenta", COLOR_MAGENTA + COLOR_INTENSITY},
  72     {"cyan", COLOR_CYAN},
  73     {"brightcyan", COLOR_CYAN + COLOR_INTENSITY},
  74     {"lightgray", COLOR_WHITE},
  75     {"white", COLOR_WHITE + COLOR_INTENSITY},
  76     {"default", -1},            /* default color of the terminal */
  77     /* special colors */
  78     {"A_REVERSE", SPEC_A_REVERSE},
  79     {"A_BOLD", SPEC_A_BOLD},
  80     {"A_BOLD_REVERSE", SPEC_A_BOLD_REVERSE},
  81     {"A_UNDERLINE", SPEC_A_UNDERLINE},
  82     /* End of list */
  83     {NULL, 0}
  84 };
  85
  86 static mc_tty_color_table_t const attributes_table[] = {
  87     {"bold", A_BOLD},
  88 #ifdef A_ITALIC                 /* available since ncurses-5.9-20130831 / slang-pre2.3.0-107 */
  89     {"italic", A_ITALIC},
  90 #endif /* A_ITALIC */
  91     {"underline", A_UNDERLINE},
  92     {"reverse", A_REVERSE},
  93     {"blink", A_BLINK},
  94     /* End of list */
  95     {NULL, 0}
  96 };
  97
  98 /* --------------------------------------------------------------------------------------------- */
  99 /*** file scope functions ************************************************************************/
 100 /* --------------------------------------------------------------------------------------------- */
 101
 102 static inline int
 103 parse_hex_digit (char c)
 104 {
 105     if (c >= '0' && c <= '9')
 106         return c - '0';
 107     c |= 0x20;
 108     if (c >= 'a' && c <= 'f')
 109         return c - 'a' + 10;
 110     return -1;
 111 }
 112
 113 /* --------------------------------------------------------------------------------------------- */
 114
 115 static int
 116 parse_256_or_true_color_name (const char *color_name)
 117 {
 118     int i;
 119     char dummy;
 120
 121     /* cppcheck-suppress invalidscanf */
 122     if (sscanf (color_name, "color%d%c", &i, &dummy) == 1 && i >= 0 && i < 256)
 123     {
 124         return i;
 125     }
 126     /* cppcheck-suppress invalidscanf */
 127     if (sscanf (color_name, "gray%d%c", &i, &dummy) == 1 && i >= 0 && i < 24)
 128     {
 129         return 232 + i;
 130     }
 131     if (strncmp (color_name, "rgb", 3) == 0 &&
 132         color_name[3] >= '0' && color_name[3] < '6' &&
 133         color_name[4] >= '0' && color_name[4] < '6' &&
 134         color_name[5] >= '0' && color_name[5] < '6' && color_name[6] == '\0')
 135     {
 136         return 16 + 36 * (color_name[3] - '0') + 6 * (color_name[4] - '0') + (color_name[5] - '0');
 137     }
 138     if (color_name[0] == '#')
 139     {
 140         int len;
 141
 142         color_name++;
 143         len = (int) strlen (color_name);
 144         if (len == 3 || len == 6)
 145         {
 146             int h[6];
 147
 148             for (i = 0; i < len; i++)
 149             {
 150                 h[i] = parse_hex_digit (color_name[i]);
 151                 if (h[i] == -1)
 152                     return -1;
 153             }
 154
 155             if (i == 3)
 156                 i = (h[0] << 20) | (h[0] << 16) | (h[1] << 12) | (h[1] << 8) | (h[2] << 4) | h[2];
 157             else
 158                 i = (h[0] << 20) | (h[1] << 16) | (h[2] << 12) | (h[3] << 8) | (h[4] << 4) | h[5];
 159             return (1 << 24) | i;
 160         }
 161     }
 162
 163     return -1;
 164 }
 165
 166 /* --------------------------------------------------------------------------------------------- */
 167 /*** public functions ****************************************************************************/
 168 /* --------------------------------------------------------------------------------------------- */
 169
 170 const char *
 171 tty_color_get_name_by_index (int idx)
 172 {
 173     int i;
 174
 175     /* Find the real English name of the first 16 colors, */
 176     /* as well as the A_* special values. */
 177     for (i = 0; color_table[i].name != NULL; i++)
 178         if (idx == color_table[i].value)
 179             return color_table[i].name;
 180
 181     /* Create and return the strings in "colorNNN" or "#rrggbb" format. */
 182     if ((idx >= 16 && idx < 256) || (idx & (1 << 24)) != 0)
 183     {
 184         char name[9];
 185
 186         if (idx < 256)
 187             g_snprintf (name, sizeof (name), "color%d", idx);
 188         else
 189             g_snprintf (name, sizeof (name), "#%06X", (unsigned int) idx & 0xFFFFFF);
 190         return g_intern_string (name);
 191     }
 192     return "default";
 193 }
 194
 195 /* --------------------------------------------------------------------------------------------- */
 196
 197 int
 198 tty_color_get_index_by_name (const char *color_name)
 199 {
 200     if (color_name != NULL)
 201     {
 202         size_t i;
 203
 204         for (i = 0; color_table[i].name != NULL; i++)
 205             if (strcmp (color_name, color_table[i].name) == 0)
 206                 return color_table[i].value;
 207         return parse_256_or_true_color_name (color_name);
 208     }
 209     return -1;
 210 }
 211
 212 /* --------------------------------------------------------------------------------------------- */
 213
 214 int
 215 tty_attr_get_bits (const char *attrs)
 216 {
 217     int attr_bits = 0;
 218
 219     if (attrs != NULL)
 220     {
 221         gchar **attr_list;
 222         int i;
 223
 224         attr_list = g_strsplit (attrs, "+", -1);
 225
 226         for (i = 0; attr_list[i] != NULL; i++)
 227         {
 228             int j;
 229
 230             for (j = 0; attributes_table[j].name != NULL; j++)
 231             {
 232                 if (strcmp (attr_list[i], attributes_table[j].name) == 0)
 233                 {
 234                     attr_bits |= attributes_table[j].value;
 235                     break;
 236                 }
 237             }
 238         }
 239         g_strfreev (attr_list);
 240     }
 241     return attr_bits;
 242 }
 243
 244 /* --------------------------------------------------------------------------------------------- */