V8/usr/src/cmd/gsi.c

/* modified for 300S
	enter plot with ACK
	leave plot with ESC ACK BEL
	supposedly compatible with 300
*/

#include <stdio.h>
#include <signal.h>
#include <sgtty.h>

#define	ACK	006	/* ack */
#define BEL    007     /* exit plot mode */
#define	ESC	033	/* escape */
#define	HFWD	'9'
#define	HREV	'8'
#define	FREV	'7'
#define	SO	016	/* shift out - enter greek */
#define	SI	017	/* shift in */
#define	UP	013	/* vt */
#define	DN	012
#define	RT	' '
#define	LF	'\b'

#define	enterplot	putchar(ACK)
#define	leaveplot	putchar(ESC); putchar(ACK)
int	restore();
struct	sgttyb ttymode;

main(argc,argv) int argc; char **argv; {
	int c, textmode;

	gtty(1, &ttymode);
	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
		signal(SIGINT, restore);
	ttymode.sg_flags &= ~(CRMOD|ALLDELAY);
	stty(1, &ttymode);
	textmode = 1;
	while( (c=getchar()) != EOF ){
		if( c==SO ){
			special();
			continue;
		}
		if (c== ACK) textmode = 1-textmode;
		if (c==BEL) textmode = 1;
		if( c=='\n' && textmode )
			putchar(015);	/* CR */
		if( c!=ESC ){
			putchar(c);
			continue;
		}
		enterplot;
		c = getchar();
		if( c == HREV )
			nplot(4,UP);
		else if( c == HFWD )
			nplot(4,DN);
		else if( c == FREV )
			nplot(8,UP);
		leaveplot;
	}
	restore();
}

restore(){
	stty(1, &ttymode);
	exit(0);
}

int	tab[] = {
	'A',	/* alpha */
	'B',	/* beta */
	'D',	/* delta */
	'W',	/* DELTA */
	'S',	/* epsilon */
	'N',	/* eta */
	'\\',	/* gamma */
	'G',	/* GAMMA */
	'o',	/* infinity - not in M37 */
	'^',	/* integral */
	'L',	/* lambda */
	'E',	/* LAMBDA */
	'M',	/* mu */
	'[',	/* nabla (del) */
	'_',	/* not */
	'@',	/* nu */
	'C',	/* omega */
	'Z',	/* OMEGA */
	']',	/* partial */
	'U',	/* phi */
	'F',	/* PHI */
	'V',	/* psi */
	'H',	/* PSI */
	'J',	/* pi */
	'P',	/* PI */
	'K',	/* rho */
	'Y',	/* sigma */
	'R',	/* SIGMA */
	'I',	/* tau */
	'O',	/* theta */
	'T',	/* THETA */
	'X',	/* xi */
	'Q',	/* zeta */
	0
};

int alpha[]	= {LF,'c',RT,RT,'(',LF,0};
int beta[]	= {'B',LF,LF,DN,DN,'|',RT,RT,UP,UP,0};
int delta[]	= {'o',UP,UP,'<',DN,DN,0};
int DELTA[]	= {LF,LF,'/',-3,DN,'-',-4,RT,'-',-3,UP,'\\',LF,LF,0};
int epsilon[]	= {'<','-',0};
int eta[]	= {'n',RT,RT,DN,DN,'|',LF,LF,UP,UP,0};
int gamma[]	= {')',RT,'/',LF,0};
int GAMMA[]	= {LF,LF,'|',RT,RT,-3,UP,'-',-3,DN,RT,RT,'`',LF,LF,0};
int infinity[]	= {LF,LF,'c',-4,RT,'o',LF,LF,0};
int integral[]	= {'|','\'',RT,RT,'`',-3,LF,-6,DN,'\'',LF,'`',RT,RT,-6,UP,0};
int lambda[]	= {'\\',-4,DN,LF,'\'',DN,LF,'\'',-5,UP,RT,RT,0};
int LAMBDA[]	= {LF,LF,'/',-4,RT,'\\',LF,LF,0};
int mu[]	= {'u',LF,LF,',',RT,RT,0};
int nabla[]	= {LF,LF,'\\',-3,UP,'-',-4,RT,'-',-3,DN,'/',LF,LF,0};
int not[]	= {'-',-2,RT,UP,',',DN,-2,LF,0};
int nu[]	= {LF,'(',-3,RT,'/',LF,LF,0};
int omega[]	= {LF,'u',-3,RT,'u',LF,LF,0};
int OMEGA[]	= {'O',DN,DN,LF,'-',RT,RT,'-',LF,UP,UP,0};
int partial[]	= {'o',RT,DN,'`',LF,UP,'`',LF,UP,'`',RT,DN,0};
int phi[]	= {'o','/',0};
int PHI[]	= {'o','[',']',0};
int psi[]	= {'/','-',DN,DN,RT,RT,'\'',-4,LF,'\'',RT,RT,UP,UP,0};
int PSI[]	= {'[',']','-',DN,DN,RT,RT,'\'',-4,LF,'`',RT,RT,UP,UP,0};
int pi[]	= {UP,'-',-3,DN,'"',DN,'"',-3,UP,0};
int PI[]	= {LF,LF,'[',']',-4,RT,'[',']',LF,LF,-3,UP,'-',-3,DN,0};
int rho[]	= {'o',LF,LF,DN,DN,'|',UP,UP,RT,RT,0};
int sigma[]	= {'o',DN,RT,RT,'~',UP,LF,LF,0};
int SIGMA[]	= {'>',-2,DN,'-',-5,UP,'-',-3,DN,0};
int tau[]	= {'t',DN,RT,RT,'~',LF,LF,LF,'~',RT,UP,0};
int theta[]	= {'O','-',0};
int THETA[]	= {'O','=',0};
int xi[]	= {'c',RT,DN,',',LF,-3,UP,'c',LF,DN,'`',RT,DN,0};
int zeta[]	= {'c',RT,DN,',',LF,-3,UP,'<',DN,DN,0};

int	*trans[] = {
	alpha,
	beta,
	delta,
	DELTA,
	epsilon,
	eta,
	gamma,
	GAMMA,
	infinity,
	integral,
	lambda,
	LAMBDA,
	mu,
	nabla,
	not,
	nu,
	omega,
	OMEGA,
	partial,
	phi,
	PHI,
	psi,
	PSI,
	pi,
	PI,
	rho,
	sigma,
	SIGMA,
	tau,
	theta,
	THETA,
	xi,
	zeta,
	0
};

special(){
	int c,i;
   loop:
	if( (c=getchar()) == SI )
		return;
	for( i=0; tab[i]!=0; i++)
		if( c==tab[i] ){
			plot(trans[i]);
			goto loop;
		}
	putchar(c);
	goto loop;
}

plot(s) int *s; {
	int i,c;
	enterplot;
	for( i=0; (c=s[i])!=0; i++ )
		if( c<0 )
			nplot(-c,s[++i]);
		else
			nplot(1, c);
	leaveplot;
	putchar(' ');
}

nplot(n,c) int n,c; {
	while(n--) {
		if( c == UP )
			putchar(ESC);
		putchar(c);
	}
}