Hi all,
I'm trying to follow various instructions I've found on getting Screen
to work with 256-colors in xterm. So far, I can get 256 output in an
xterm, and I can also get it to work in Screen if I set TERM to
xterm-256color. What I can't get working is the termcapinfo stanza in
.screenrc that is supposed to update the screen-bce termcap entry.
I have attached my (currently simplified/uncommented) .screenrc as well
as a C program I am using to test terminal capabilities (compiled with
gcc -o tty-colors tty-colors.c -lncurses). When I run this program in
xterm, or via "TERM=xterm-256color" in screen, I get 256 colors. But
when I run it in screen normally, I get 8 colors. Any ideas?
Thanks,
-- Erik
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <curses.h>
#include <term.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
/*
* For the terminal info
*/
static char term_buffer[8192];
/*
* For the capabilities
*/
char *setfore = NULL,
*setback = NULL,
*resetcolor = NULL,
*standstr = NULL,
*exit_stand = NULL,
*inicolor_str = NULL,
*clrnames = NULL,
*bold = NULL,
*dim = NULL,
*reverse = NULL,
*blinking = NULL,
*exit_attr = NULL,
*opair = NULL;
int maxcolors = 0,
maxpairs = 0,
do_force_16 = 0;
/******************
* Initialize the terminal info
*/
void init_terminal_data ()
{
char *termtype = getenv ("TERM");
int success;
if (termtype == 0) {
fprintf(stderr,"Specify a terminal type with `setenv TERM <yourtype>'.\n");
exit(1);
}
success = tgetent (term_buffer, termtype);
if (success < 0) {
fprintf(stderr,"Could not access the termcap data base.\n");
exit(1);
}
if (success == 0) {
fprintf(stderr,"Terminal type `%s' is not defined.\n", termtype);
exit(1);
}
}
/*******************
* Print a band with background of all available colors
*/
void colormap( int do_boldstand )
{
int back;
for( back = 0; back < maxcolors; back++ ) {
char *strB;
strB = strdup(tparm(setback,back));
printf("%s %s",strB,resetcolor);
if( back%8 == 7 )
printf("\n");
}
if (do_boldstand) {
for( back = 0; back < maxcolors; back++ ) {
char *strB;
strB = strdup(tparm(setfore,back));
printf("%s%s%s %s%s%s",bold,standstr,strB,resetcolor,
exit_stand,exit_attr);
if( back%8 == 7 )
printf("\n");
}
}
for ( back = 0; back < maxcolors; back++ ) {
char *strB;
strB = strdup(tparm(setfore,back));
printf("%sXXXXXXXX%s",strB,resetcolor);
if( back%8 == 7 )
printf("\n");
}
if ( bold ) {
for ( back = 0; back < maxcolors; back++ ) {
char *strB;
strB = strdup(tparm(setfore,back));
printf("%s%sXXXXXXXX%s%s",bold,strB,resetcolor,exit_attr);
if( back%8 == 7 )
printf("\n");
}
}
}
/*********************
* Print a table with all the fore and background
* color combinations, with bold and optionally standout
*/
void combinations_of_colors(int do_standout, int do_boldstand)
{
int fore, back;
for( fore = 0; fore < maxcolors; fore ++ )
for( back = 0; back < maxcolors; back ++ ) {
char *strF, *strB;
char *sstrF, *sstrB;
strB = strdup(tparm(setback,back));
strF = strdup(tparm(setfore,fore));
printf( "%s%s%s [%3d|%3d]%s%s", "",strF,strB,fore,back,resetcolor,"");
/* Bold */
printf( "%s%s%sB[%3d|%3d]%s%s", bold,strF,strB,fore,back,resetcolor,exit_attr);
/* Standout usually does not work good... do only if asked for */
/* Since standout usually reverses, we'll reverse the fore and back too */
sstrB = strdup(tparm(setback,fore));
sstrF = strdup(tparm(setfore,back));
if (do_standout)
printf( "%s%s%sS[%3d|%3d]%s%s",standstr,sstrF,sstrB,fore,back,resetcolor,exit_stand);
if (do_boldstand)
printf( "%s%s%s%sS[%3d|%3d]%s%s%s",bold,standstr,sstrF,sstrB,fore,back,resetcolor,exit_stand,exit_attr);
printf( "\n" );
}
printf( "\n" );
}
/** Query and assign a capability
*/
void capability(char**buf,char*code,char**var,char*message)
{
char *val = tgetstr(code,buf);
if ( ! val ) {
*var=NULL;
printf("%s\n",message);
} else {
*var=strdup(val);
}
}
/****************************
* Retrieve the capabilities
*/
void get_capabilities()
{
char buffer[2500]="", *buf=buffer;
/*
* Get the capabilities
*/
maxcolors = tgetnum("Co");
if ( maxcolors <= 0 ) {
printf("I am sorry, your terminal does not show color in the capabilities\n");
}
maxpairs = tgetnum("pa");
if (maxpairs <= 0 ) {
printf("I am sorry, your terminal does not have the max color pairs information\n");
}
capability(&buf,"AF",&setfore,
"I am sorry, your terminal does not have the set foreground color string in the capabilities");
capability(&buf,"AB",&setback,
"I am sorry, your terminal does not have the set background color string in the capabilities");
capability(&buf,"op",&resetcolor,
"I am sorry, your terminal does not have the reset current color string in the capabilities");
capability(&buf,"md",&bold,
"I am sorry, your terminal does not have the bold string in the capabilities");
capability(&buf,"mh",&dim,
"I am sorry, your terminal does not have the dim string in the capabilities");
capability(&buf,"mr",&reverse,
"I am sorry, your terminal does not have the reverse string in the capabilities");
capability(&buf,"mb",&blinking,
"I am sorry, your terminal does not have the blinking string in the capabilities");
capability(&buf,"so",&standstr,
"I am sorry, your terminal does not have the standout string in the capabilities");
capability(&buf,"se",&exit_stand,
"I am sorry, your terminal does not have the exit standout string in the capabilities");
capability(&buf,"me",&exit_attr,
"I am sorry, your terminal does not have the exit attribute string in the capabilities");
capability(&buf,"Ic",&inicolor_str,
"I am sorry, your terminal does not have the init color string in the capabilities");
capability(&buf,"Yw",&clrnames,
"I am sorry, your terminal does not have the color names string in the capabilities");
capability(&buf,"op",&opair,
"I am sorry, your terminal does not have the original pairs string in the capabilities");
}
/********************
* Query the RGB map
*/
void query_rgb()
{
int i, fd=fileno(stdin);
long mode;
struct termios ts;
if ( ! isatty(fd) || ! isatty(fileno(stdout)) )
printf("Sorry, but stdin and/or stdout is not the terminal tty so I cannot query it\n");
else {
if ( ! inicolor_str )
printf("According to your terminal info this terminal rgb query will hang. Press ^C to abort the query.\n");
/*
* We need to do the equivalent of cbreak()
*/
tcgetattr(fd,&ts);
mode=ts.c_lflag; /* Save mode so we can restore afterwards */
ts.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
tcsetattr(fd, TCSANOW,&ts);
ts.c_lflag = mode;
/* Ask for the colors */
for ( i = 0 ; 1 ; i ++ ) {
char buffer[1000],
*buf=buffer,
*end=buffer+sizeof(buffer)-1;
int interrupted = 0;
/* This is a string retrieved from Noah
* Friedmans xterm-frobs.el. I could not find
* any termcap entry that verifies it
*/
printf("\e]4;%d;?;\e\\",i);
fflush(stdout);
memset(buffer,0,sizeof(buffer));
while( buf!=end ) {
fd_set fdsr, fdse,fdsw;
int fds;
struct timeval t;
t.tv_sec = 0;
t.tv_usec = 100000; /* 100ms */
FD_ZERO(&fdsr);
FD_ZERO(&fdse);
FD_ZERO(&fdsw);
FD_SET(fd, &fdsr);
FD_SET(fd, &fdse);
fds = select(fd+1,&fdsr,&fdsw,&fdse,&t);
if ( fds < 1) {
tcsetattr(fd, TCSANOW,&ts);
return;
}
if ( ! FD_ISSET(fd, &fdsr) ) {
tcsetattr(fd, TCSANOW,&ts);
return;
}
read(fd,buf,1);
if ( *buf == '\\') {
/* The response sequence ends with the only "\"
of the response
*/
break;
}
if ( *buf == '' ) {
/*
If the terminal did not reply, chances are
this is not supported and the user used ^C
*/
interrupted=1;
break;
}
*buf++;
}
if (interrupted)
break;
/* Extract the rgb values */
buf=strstr(buffer,"rgb:");
if( buf ) {
buf+=4;
char *end = strstr(buf,"\e\\");
if(end)
*end='\0';
} else {
buf="Did not find info";
}
printf("Color %d: %s\n",i,buf);
fflush(stdout);
}
/* Restore terminal settings */
tcsetattr(fd, TCSANOW,&ts);
}
}
/**************
* Fake the capabilities the ansi terminal info
* would return
*/
void force_ansi()
{
if ( ! (maxcolors > 0) ) {
maxcolors = 8;
printf("WARNING: Forcing ANSI testing, 8 colors\n");
}
if ( maxcolors == 8 && do_force_16 ) {
maxcolors = 16;
printf("WARNING: Forcing 16 color testing\n");
}
if ( ! setfore ) {
setfore="\e[3%p1%dm";
printf("WARNING: Forcing ANSI set foreground: ^[%s\n", setfore+1);
}
if ( ! setback ) {
setback="\e[4%p1%dm";
printf("WARNING: Forcing ANSI set background: ^[%s\n", setback+1);
}
if ( ! resetcolor ) {
resetcolor="\e[39;49m";
printf("WARNING: Forcing ANSI reset colour : ^[%s\n", resetcolor+1);
}
}
int
main( int argc, char *argv[] )
{
int do_colormap = 0,
do_combinations = 0,
do_standout = 0,
do_boldstand = 0,
do_query = 0;
{ /* Process arguments */
int i;
for( i = 1; i < argc; i++ ) {
if( ! strcmp(argv[i],"-m") )
do_colormap = 1;
if( ! strcmp(argv[i],"-c") )
do_combinations=1;
if ( ! strcmp(argv[i], "-f" ) )
do_force_16 = 1;
if( ! strcmp(argv[i],"-s") )
do_standout=1;
if( ! strcmp(argv[i],"-bs") )
do_boldstand=1;
if( ! strcmp(argv[i],"-q") )
do_query=1;
}
}
init_terminal_data();
get_capabilities();
/*
* Report the capabilities
*/
printf("\n\nTerminal: %s\n",getenv("TERM"));
if ( maxcolors > 0 )
printf("You've got %d colours\n",maxcolors);
if ( maxpairs > 0 )
printf("You've got %d pairs of colors possible\n",maxpairs);
if ( setfore ) printf("To set foreground: ^[%s\n", setfore+1);
if ( setback ) printf("To set background: ^[%s\n", setback+1);
if ( resetcolor ) printf("To reset colours : ^[%s\n", resetcolor+1);
if ( standstr ) printf("To standout : ^[%s\n", standstr+1);
if ( bold ) printf("To bold : ^[%s\n", bold+1);
if ( dim ) printf("To dim : ^[%s\n", dim+1);
if ( reverse ) printf("To reverse : ^[%s\n", reverse+1);
if ( blinking ) printf("To blinking : ^[%s\n", blinking+1);
if ( exit_stand ) printf("To exit standout : ^[%s\n", exit_stand+1);
if ( exit_attr ) printf("To exit attribute: ^[%s\n", exit_attr+1);
if ( inicolor_str ) printf("To init color : ^[%s\n", inicolor_str+1);
if ( clrnames ) printf("To color names : ^[%s\n", clrnames+1);
if ( opair ) printf("To original pairs: ^[%s\n", opair+1);
/*
* Let's try the ANSI defaults
*/
if ( do_colormap || do_combinations ) {
force_ansi();
}
if ( do_query ) {
printf("\nQuery the RGB from the terminal:\n");
query_rgb();
}
if ( do_colormap ) {
printf("\nColormap:\n");
colormap( do_boldstand );
}
if ( do_combinations ) {
printf("\nColor combinations:\n");
combinations_of_colors( do_standout,
do_boldstand);
}
return 0;
}
escape ^ww
caption always "foo"
startup_message off
vbell on
vbell_msg "bell"
caption always " %H %l %30=%f %2n %t%=%D, %M %d %C %A "
# for 256 colors in screen
attrcolor b ".I"
termcapinfo xterm-256color 'Co#256:AB=\E[48;5;%dm:AF=\E[38;5;%dm'
defbce "on"
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