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direwolf/textcolor.c

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//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
// Copyright (C) 2011, 2012, 2013, 2014 John Langner, WB2OSZ
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
/*-------------------------------------------------------------------
*
* Name: textcolor.c
*
* Purpose: Originally this would only set color of text
* and we used printf everywhere.
* Now we also have a printf replacement that can
* be used to redirect all output to the desired place.
* This opens the door to using ncurses, a GUI, or
* running as a daemon.
*
* Description: For Linux and Cygwin use the ANSI escape sequences.
* In earlier versions of Windows, the cmd window and ANSI.SYS
* could interpret this but it doesn't seem to be available
* anymore so we use a different interface.
*
* References:
* http://en.wikipedia.org/wiki/ANSI_escape_code
* http://academic.evergreen.edu/projects/biophysics/technotes/program/ansi_esc.htm
*
*
>>>> READ THIS PART!!! <<<<
*
*
* Problem: The ANSI escape sequences, used on Linux, allow 8 basic colors.
* Unfortunately, white is not one of them. We only have dark
* white, also known as light gray. To get brighter colors,
* we need to apply an attribute. On some systems, the bold
* attribute produces a brighter color rather than a bold font.
* On other systems, we need to use the blink attribute to get
* bright colors, including white. However on others, blink
* does actually produce blinking characters.
*
* Several people have also complained that bright green is
* very hard to read against a light background. The current
* implementation does not allow easy user customization of colors.
*
* Currently, the only option is to put "-t 0" on the command
* line to disable all text color. This is more readable but
* makes it harder to distinguish different types of
* information, e.g. received packets vs. error messages.
*
* A few people have suggested ncurses. This needs to
* be investigated for a future version. The foundation has
* already been put in place. All of the printf's should have been
* replaced by dw_printf, defined in this file. All of the
* text output is now being funneled thru this one function
* so it should be easy to send it to the user by some
* other means.
*
*--------------------------------------------------------------------*/
#include "direwolf.h" // Should be first. includes windows.h
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#if __WIN32__
#define BACKGROUND_WHITE (BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_INTENSITY)
#elif __CYGWIN__ /* Cygwin */
/* For Cygwin we need "blink" (5) rather than the */
/* expected bright/bold (1) to get bright white background. */
/* Makes no sense but I stumbled across that somewhere. */
static const char background_white[] = "\e[5;47m";
/* Whenever a dark color is used, the */
/* background is reset and needs to be set again. */
static const char black[] = "\e[0;30m" "\e[5;47m";
static const char red[] = "\e[1;31m";
static const char green[] = "\e[1;32m";
static const char yellow[] = "\e[1;33m";
static const char blue[] = "\e[1;34m";
static const char magenta[] = "\e[1;35m";
static const char cyan[] = "\e[1;36m";
static const char dark_green[] = "\e[0;32m" "\e[5;47m";
/* Clear from cursor to end of screen. */
static const char clear_eos[] = "\e[0J";
#elif __arm__ /* Linux on Raspberry Pi or similar */
/* We need "blink" (5) rather than the */
/* expected bright/bold (1) to get bright white background. */
/* Makes no sense but I stumbled across that somewhere. */
/* If you do get blinking, remove all references to "\e[5;47m" */
static const char background_white[] = "\e[5;47m";
/* Whenever a dark color is used, the */
/* background is reset and needs to be set again. */
static const char black[] = "\e[0;30m" "\e[5;47m";
static const char red[] = "\e[1;31m" "\e[5;47m";
static const char green[] = "\e[1;32m" "\e[5;47m";
//static const char yellow[] = "\e[1;33m" "\e[5;47m";
static const char blue[] = "\e[1;34m" "\e[5;47m";
static const char magenta[] = "\e[1;35m" "\e[5;47m";
//static const char cyan[] = "\e[1;36m" "\e[5;47m";
static const char dark_green[] = "\e[0;32m" "\e[5;47m";
/* Clear from cursor to end of screen. */
static const char clear_eos[] = "\e[0J";
#else /* Other Linux */
#if 1 /* new in version 1.2, as suggested by IW2DHW */
/* Test done using gnome-terminal and xterm */
static const char background_white[] = "\e[48;2;255;255;255m";
/* Whenever a dark color is used, the */
/* background is reset and needs to be set again. */
static const char black[] = "\e[0;30m" "\e[48;2;255;255;255m";
static const char red[] = "\e[0;31m" "\e[48;2;255;255;255m";
static const char green[] = "\e[0;32m" "\e[48;2;255;255;255m";
//static const char yellow[] = "\e[0;33m" "\e[48;2;255;255;255m";
static const char blue[] = "\e[0;34m" "\e[48;2;255;255;255m";
static const char magenta[] = "\e[0;35m" "\e[48;2;255;255;255m";
//static const char cyan[] = "\e[0;36m" "\e[48;2;255;255;255m";
static const char dark_green[] = "\e[0;32m" "\e[48;2;255;255;255m";
#else /* from version 1.1 */
static const char background_white[] = "\e[47;1m";
/* Whenever a dark color is used, the */
/* background is reset and needs to be set again. */
static const char black[] = "\e[0;30m" "\e[1;47m";
static const char red[] = "\e[1;31m" "\e[1;47m";
static const char green[] = "\e[1;32m" "\e[1;47m";
//static const char yellow[] = "\e[1;33m" "\e[1;47m";
static const char blue[] = "\e[1;34m" "\e[1;47m";
static const char magenta[] = "\e[1;35m" "\e[1;47m";
//static const char cyan[] = "\e[1;36m" "\e[1;47m";
static const char dark_green[] = "\e[0;32m" "\e[1;47m";
#endif
/* Clear from cursor to end of screen. */
static const char clear_eos[] = "\e[0J";
#endif /* end Linux */
#include "textcolor.h"
/*
* g_enable_color:
* 0 = disable text colors.
* 1 = normal.
* others... future possibility.
*/
static int g_enable_color = 1;
void text_color_init (int enable_color)
{
g_enable_color = enable_color;
#if __WIN32__
if (g_enable_color) {
HANDLE h;
CONSOLE_SCREEN_BUFFER_INFO csbi;
WORD attr = BACKGROUND_WHITE;
DWORD length;
COORD coord;
DWORD nwritten;
h = GetStdHandle(STD_OUTPUT_HANDLE);
if (h != NULL && h != INVALID_HANDLE_VALUE) {
GetConsoleScreenBufferInfo (h, &csbi);
length = csbi.dwSize.X * csbi.dwSize.Y;
coord.X = 0;
coord.Y = 0;
FillConsoleOutputAttribute (h, attr, length, coord, &nwritten);
}
}
#else
if (g_enable_color) {
//printf ("%s", clear_eos);
printf ("%s", background_white);
printf ("%s", clear_eos);
printf ("%s", black);
}
#endif
}
#if __WIN32__
/* Seems that ANSI.SYS is no longer available. */
void text_color_set ( enum dw_color_e c )
{
WORD attr;
HANDLE h;
if (g_enable_color == 0) {
return;
}
switch (c) {
default:
case DW_COLOR_INFO:
attr = BACKGROUND_WHITE;
break;
case DW_COLOR_ERROR:
attr = FOREGROUND_RED | FOREGROUND_INTENSITY | BACKGROUND_WHITE;
break;
case DW_COLOR_REC:
attr = FOREGROUND_GREEN | FOREGROUND_INTENSITY | BACKGROUND_WHITE;
break;
case DW_COLOR_DECODED:
attr = FOREGROUND_BLUE | FOREGROUND_INTENSITY | BACKGROUND_WHITE;
break;
case DW_COLOR_XMIT:
attr = FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_INTENSITY | BACKGROUND_WHITE;
break;
case DW_COLOR_DEBUG:
attr = FOREGROUND_GREEN | BACKGROUND_WHITE;
break;
}
h = GetStdHandle(STD_OUTPUT_HANDLE);
if (h != NULL && h != INVALID_HANDLE_VALUE) {
SetConsoleTextAttribute (h, attr);
}
}
#else
void text_color_set ( enum dw_color_e c )
{
if (g_enable_color == 0) {
return;
}
switch (c) {
default:
case DW_COLOR_INFO:
printf ("%s", black);
break;
case DW_COLOR_ERROR:
printf ("%s", red);
break;
case DW_COLOR_REC:
printf ("%s", green);
break;
case DW_COLOR_DECODED:
printf ("%s", blue);
break;
case DW_COLOR_XMIT:
printf ("%s", magenta);
break;
case DW_COLOR_DEBUG:
printf ("%s", dark_green);
break;
}
}
#endif
/*-------------------------------------------------------------------
*
* Name: dw_printf
*
* Purpose: printf replacement that allows us to send all text
* output to stdout or other desired destination.
*
* Inputs: fmt - C language format.
* ... - Addtional arguments, just like printf.
*
*
* Returns: Number of characters in result.
*
* Bug: Fixed size buffer.
* I'd rather not do a malloc for each print.
*
*--------------------------------------------------------------------*/
// TODO: replace all printf, look for stderr, perror
// TODO: $ grep printf *.c | grep -v dw_printf | grep -v fprintf | gawk '{ print $1 }' | sort -u
int dw_printf (const char *fmt, ...)
{
#define BSIZE 1000
va_list args;
char buffer[BSIZE];
int len;
va_start (args, fmt);
len = vsnprintf (buffer, BSIZE, fmt, args);
va_end (args);
// TODO: other possible destinations...
fputs (buffer, stdout);
return (len);
}
#if TESTC
main ()
{
printf ("Initial condition\n");
text_color_init (1);
printf ("After text_color_init\n");
text_color_set(DW_COLOR_INFO); printf ("Info\n");
text_color_set(DW_COLOR_ERROR); printf ("Error\n");
text_color_set(DW_COLOR_REC); printf ("Rec\n");
text_color_set(DW_COLOR_DECODED); printf ("Decoded\n");
text_color_set(DW_COLOR_XMIT); printf ("Xmit\n");
text_color_set(DW_COLOR_DEBUG); printf ("Debug\n");
}
#endif
/* end textcolor.c */
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