lib/color.c

   1 #include <stdio.h>
   2 #include <stdarg.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <sys/socket.h>
   6 #include <sys/types.h>
   7 #include <linux/if.h>
   8
   9 #include "color.h"
  10
  11 enum color {
  12         C_RED,
  13         C_GREEN,
  14         C_YELLOW,
  15         C_BLUE,
  16         C_MAGENTA,
  17         C_CYAN,
  18         C_WHITE,
  19         C_BOLD_RED,
  20         C_BOLD_GREEN,
  21         C_BOLD_YELLOW,
  22         C_BOLD_BLUE,
  23         C_BOLD_MAGENTA,
  24         C_BOLD_CYAN,
  25         C_BOLD_WHITE,
  26         C_CLEAR
  27 };
  28
  29 static const char * const color_codes[] = {
  30         "\e[31m",
  31         "\e[32m",
  32         "\e[33m",
  33         "\e[34m",
  34         "\e[35m",
  35         "\e[36m",
  36         "\e[37m",
  37         "\e[1;31m",
  38         "\e[1;32m",
  39         "\e[1;33m",
  40         "\e[1;34m",
  41         "\e[1;35m",
  42         "\e[1;36m",
  43         "\e[1;37m",
  44         "\e[0m",
  45         NULL,
  46 };
  47
  48 static enum color attr_colors[] = {
  49         /* light background */
  50         C_CYAN,
  51         C_YELLOW,
  52         C_MAGENTA,
  53         C_BLUE,
  54         C_GREEN,
  55         C_RED,
  56         C_CLEAR,
  57
  58         /* dark background */
  59         C_BOLD_CYAN,
  60         C_BOLD_YELLOW,
  61         C_BOLD_MAGENTA,
  62         C_BOLD_BLUE,
  63         C_BOLD_GREEN,
  64         C_BOLD_RED,
  65         C_CLEAR
  66 };
  67
  68 static int is_dark_bg;
  69 static int color_is_enabled;
  70
  71 void enable_color(void)
  72 {
  73         color_is_enabled = 1;
  74         set_color_palette();
  75 }
  76
  77 void set_color_palette(void)
  78 {
  79         char *p = getenv("COLORFGBG");
  80
  81         /*
  82          * COLORFGBG environment variable usually contains either two or three
  83          * values separated by semicolons; we want the last value in either case.
  84          * If this value is 0-6 or 8, background is dark.
  85          */
  86         if (p && (p = strrchr(p, ';')) != NULL
  87                 && ((p[1] >= '0' && p[1] <= '6') || p[1] == '8')
  88                 && p[2] == '\0')
  89                 is_dark_bg = 1;
  90 }
  91
  92 void check_if_color_enabled(void)
  93 {
  94         if (color_is_enabled) {
  95                 fprintf(stderr, "Option \"-json\" conflicts with \"-color\".\n");
  96                 exit(1);
  97         }
  98 }
  99
 100 int color_fprintf(FILE *fp, enum color_attr attr, const char *fmt, ...)
 101 {
 102         int ret = 0;
 103         va_list args;
 104
 105         va_start(args, fmt);
 106
 107         if (!color_is_enabled || attr == COLOR_NONE) {
 108                 ret = vfprintf(fp, fmt, args);
 109                 goto end;
 110         }
 111
 112         ret += fprintf(fp, "%s",
 113                        color_codes[attr_colors[is_dark_bg ? attr + 8 : attr]]);
 114         ret += vfprintf(fp, fmt, args);
 115         ret += fprintf(fp, "%s", color_codes[C_CLEAR]);
 116
 117 end:
 118         va_end(args);
 119         return ret;
 120 }
 121
 122 enum color_attr ifa_family_color(__u8 ifa_family)
 123 {
 124         switch (ifa_family) {
 125         case AF_INET:
 126                 return COLOR_INET;
 127         case AF_INET6:
 128                 return COLOR_INET6;
 129         default:
 130                 return COLOR_CLEAR;
 131         }
 132 }
 133
 134 enum color_attr oper_state_color(__u8 state)
 135 {
 136         switch (state) {
 137         case IF_OPER_UP:
 138                 return COLOR_OPERSTATE_UP;
 139         case IF_OPER_DOWN:
 140                 return COLOR_OPERSTATE_DOWN;
 141         default:
 142                 return COLOR_CLEAR;
 143         }
 144 }