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.

README.md

@@ -82,7 +82,7 @@ The command-line interface is straightforward as reflected in the output from
         --log-file <filename>              Set log filename
         --log-strip                        Strip control characters and escape sequences
     -m, --map <flags>                      Map characters
-    -c, --color 0..255|none|list           Colorize tio text (default: 15)
+    -c, --color 0..255|bold|none|list      Colorize tio text (default: bold)
     -S, --socket <socket>                  Redirect I/O to file or network socket
     -x, --hexadecimal                      Enable hexadecimal mode
     -v, --version                          Display version

man/tio.1.in

@@ -155,14 +155,15 @@ If defining more than one flag, the flags must be comma separated.
 Enable hexadecimal mode.
 
 .TP
-.BR \-c ", " "\-\-color " \fI0..255|none|list
+.BR \-c ", " "\-\-color " \fI0..255|bold|none|list
 
 Colorize tio text using ANSI color code value ranging from 0 to 255 or use
-"none" for no color.
+"none" for no color or use "bold" to apply bold formatting to existing system
+color.
 
 Use "list" to print a list of available ANSI color codes.
 
-Default value is 15.
+Default value is "bold".
 
 .TP
 .BR \-S ", " "\-\-socket \fI<socket>\fR\fB

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()
 {
+  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); \