Introduce bold color option

Introduce "bold" color option which only apply bold color formatting to
existing system color.

Also make "bold" the default color option.

Fixes all white issue with black on white tio text.

src/configfile.c

@@ -226,6 +226,12 @@ static int data_handler(void *user, const char *section, const char *name,
                 return 0;
             }
 
+            if (!strcmp(value, "bold"))
+            {
+                option.color = 256; // Bold
+                return 0;
+            }
+
             option.color = atoi(value);
             if ((option.color < 0) || (option.color > 255))
             {

src/options.c

@@ -65,7 +65,7 @@ struct option_t option =
     .timestamp = TIMESTAMP_NONE,
     .socket = NULL,
     .map = "",
-    .color = 15,
+    .color = 256, // Bold
     .hex_mode = false,
     .prefix_code = 20, // ctrl-t
     .prefix_key = 't',
@@ -95,7 +95,7 @@ void print_help(char *argv[])
     printf("      --log-file <filename>              Set log filename\n");
     printf("      --log-strip                        Strip control characters and escape sequences\n");
     printf("  -m, --map <flags>                      Map characters\n");
-    printf("  -c, --color 0..255|none|list           Colorize tio text (default: 15)\n");
+    printf("  -c, --color 0..255|bold|none|list      Colorize tio text (default: bold)\n");
     printf("  -S, --socket <socket>                  Redirect I/O to file or network socket\n");
     printf("  -x, --hexadecimal                      Enable hexadecimal mode\n");
     printf("  -v, --version                          Display version\n");
@@ -333,7 +333,13 @@ void options_parse(int argc, char *argv[])
 
                 if (!strcmp(optarg, "none"))
                 {
-                    option.color = -1;
+                    option.color = -1; // No color
+                    break;
+                }
+
+                if (!strcmp(optarg, "bold"))
+                {
+                    option.color = 256; // Bold
                     break;
                 }
 

src/print.c

@@ -39,6 +39,14 @@ void print_normal(char c)
 
 void print_init_ansi_formatting()
 {
-  // Set bold text with user defined ANSI color
-  sprintf(ansi_format, "\e[1;38;5;%dm", option.color);
+  if (option.color == 256)
+  {
+    // Set bold text with no color changes
+    sprintf(ansi_format, "\e[1m");
+  }
+  else
+  {
+    // Set bold text with user defined ANSI color
+    sprintf(ansi_format, "\e[1;38;5;%dm", option.color);
+  }
 }

src/print.h

@@ -42,7 +42,7 @@ extern char ansi_format[];
 #define ansi_error_printf(format, args...) \
 { \
   if (option.color < 0) \
-    fprintf (stdout, "\r" format "\r\n", ## args); \
+    fprintf (stderr, "\r" format "\r\n", ## args); \
   else \
     fprintf (stderr, "\r%s" format ANSI_RESET "\r\n", ansi_format, ## args); \
   fflush(stderr); \