clr.c

   1 /* color management */
   2 #include <ctype.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include <stdlib.h>
   6 #include "roff.h"
   7
   8 static struct color {
   9         char *name;
  10         int value;
  11 } colors[] = {
  12         {"black", CLR_RGB(0, 0, 0)},
  13         {"red", CLR_RGB(0xff, 0, 0)},
  14         {"green", CLR_RGB(0, 0xff, 0)},
  15         {"yellow", CLR_RGB(0xff, 0xff, 0)},
  16         {"blue", CLR_RGB(0, 0, 0xff)},
  17         {"magenta", CLR_RGB(0xff, 0, 0xff)},
  18         {"cyan", CLR_RGB(0, 0xff, 0xff)},
  19         {"white", CLR_RGB(0xff, 0xff, 0xff)},
  20 };
  21
  22 /* returns a static buffer */
  23 char *clr_str(int c)
  24 {
  25         static char clr_buf[32];
  26         if (!c)
  27                 return "0";
  28         sprintf(clr_buf, "#%02x%02x%02x", CLR_R(c), CLR_G(c), CLR_B(c));
  29         return clr_buf;
  30 }
  31
  32 /* read color component */
  33 static int ccom(char *s, int len)
  34 {
  35         static char *digs = "0123456789abcdef";
  36         int n = 0;
  37         int i;
  38         for (i = 0; i < len; i++)
  39                 if (strchr(digs, tolower(s[i])))
  40                         n = n * 16 + (strchr(digs, tolower(s[i])) - digs);
  41         return len == 1 ? n * 255 / 15 : n;
  42 }
  43
  44 int clr_get(char *s)
  45 {
  46         int i;
  47         if (s[0] == '#' && strlen(s) == 7)
  48                 return CLR_RGB(ccom(s + 1, 2), ccom(s + 3, 2), ccom(s + 5, 2));
  49         if (s[0] == '#' && strlen(s) == 4)
  50                 return CLR_RGB(ccom(s + 1, 1), ccom(s + 2, 1), ccom(s + 3, 1));
  51         if (s[0] == '#' && strlen(s) == 3)
  52                 return CLR_RGB(ccom(s + 1, 2), ccom(s + 1, 2), ccom(s + 1, 2));
  53         if (s[0] == '#' && strlen(s) == 2)
  54                 return CLR_RGB(ccom(s + 1, 1), ccom(s + 1, 1), ccom(s + 1, 1));
  55         if (isdigit(s[0]) && atoi(s) >= 0 && atoi(s) < LEN(colors))
  56                 return colors[atoi(s)].value;
  57         for (i = 0; i < LEN(colors); i++)
  58                 if (!strcmp(colors[i].name, s))
  59                         return colors[i].value;
  60         return 0;
  61 }