clr.c

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