[unix-history] / usr / src / usr.bin / bc / bc.y

%{
static	char *sccsid = "@(#)bc.y	4.5 (Berkeley) 88/04/24";
	int *getout();
%}
%right '='
%left '+' '-'
%left '*' '/' '%'
%right '^'
%left UMINUS

%term LETTER DIGIT SQRT LENGTH _IF  FFF EQ
%term _WHILE _FOR NE LE GE INCR DECR
%term _RETURN _BREAK _DEFINE BASE OBASE SCALE
%term EQPL EQMI EQMUL EQDIV EQREM EQEXP
%term _AUTO DOT
%term QSTR

%{
#include <stdio.h>
#include <varargs.h>
FILE *in;
char cary[1000], *cp = { cary };
char string[1000], *str = {string};
int crs = '0';
int rcrs = '0';  /* reset crs */
int bindx = 0;
int lev = 0;
int ln;
char *ss;
int bstack[10] = { 0 };
char *numb[15] = {
  " 0", " 1", " 2", " 3", " 4", " 5",
  " 6", " 7", " 8", " 9", " 10", " 11",
  " 12", " 13", " 14" };
int *pre, *post;
%}
%%
start	: 
	|  start stat tail
		= output( $2 );
	|  start def dargs ')' '{' dlist slist '}'
		={	bundle( 6,pre, $7, post ,"0",numb[lev],"Q");
			conout( $$, $2 );
			rcrs = crs;
			output( "" );
			lev = bindx = 0;
			}
	;

dlist	:  tail
	| dlist _AUTO dlets tail
	;

stat	:  e 
		={ bundle(2, $1, "ps." ); }
	| 
		={ bundle(1, "" ); }
	|  QSTR
		={ bundle(3,"[",$1,"]P");}
	|  LETTER '=' e
		={ bundle(3, $3, "s", $1 ); }
	|  LETTER '[' e ']' '=' e
		={ bundle(4, $6, $3, ":", geta($1)); }
	|  LETTER EQOP e
		={ bundle(6, "l", $1, $3, $2, "s", $1 ); }
	|  LETTER '[' e ']' EQOP e
		={ bundle(8,$3, ";", geta($1), $6, $5, $3, ":", geta($1));}
	|  _BREAK
		={ bundle(2, numb[lev-bstack[bindx-1]], "Q" ); }
	|  _RETURN '(' e ')'
		= bundle(4, $3, post, numb[lev], "Q" );
	|  _RETURN '(' ')'
		= bundle(4, "0", post, numb[lev], "Q" );
	| _RETURN
		= bundle(4,"0",post,numb[lev],"Q");
	| SCALE '=' e
		= bundle(2, $3, "k");
	| SCALE EQOP e
		= bundle(4,"K",$3,$2,"k");
	| BASE '=' e
		= bundle(2,$3, "i");
	| BASE EQOP e
		= bundle(4,"I",$3,$2,"i");
	| OBASE '=' e
		= bundle(2,$3,"o");
	| OBASE EQOP e
		= bundle(4,"O",$3,$2,"o");
	|  '{' slist '}'
		={ $$ = $2; }
	|  FFF
		={ bundle(1,"fY"); }
	|  error
		={ bundle(1,"c"); }
	|  _IF CRS BLEV '(' re ')' stat
		={	conout( $7, $2 );
			bundle(3, $5, $2, " " );
			}
	|  _WHILE CRS '(' re ')' stat BLEV
		={	bundle(3, $6, $4, $2 );
			conout( $$, $2 );
			bundle(3, $4, $2, " " );
			}
	|  fprefix CRS re ';' e ')' stat BLEV
		={	bundle(5, $7, $5, "s.", $3, $2 );
			conout( $$, $2 );
			bundle(5, $1, "s.", $3, $2, " " );
			}
	|  '~' LETTER '=' e
		={	bundle(3,$4,"S",$2); }
	;

EQOP	:  EQPL
		={ $$ = "+"; }
	|  EQMI
		={ $$ = "-"; }
	|  EQMUL
		={ $$ = "*"; }
	|  EQDIV
		={ $$ = "/"; }
	|  EQREM
		={ $$ = "%%"; }
	|  EQEXP
		={ $$ = "^"; }
	;

fprefix	:  _FOR '(' e ';'
		={ $$ = $3; }
	;

BLEV	:
		={ --bindx; }
	;

slist	:  stat
	|  slist tail stat
		={ bundle(2, $1, $3 ); }
	;

tail	:  '\n'
		={ln++;}
	|  ';'
	;

re	:  e EQ e
		= bundle(3, $1, $3, "=" );
	|  e '<' e
		= bundle(3, $1, $3, ">" );
	|  e '>' e
		= bundle(3, $1, $3, "<" );
	|  e NE e
		= bundle(3, $1, $3, "!=" );
	|  e GE e
		= bundle(3, $1, $3, "!>" );
	|  e LE e
		= bundle(3, $1, $3, "!<" );
	|  e
		= bundle(2, $1, " 0!=" );
	;

e	:  e '+' e
		= bundle(3, $1, $3, "+" );
	|  e '-' e
		= bundle(3, $1, $3, "-" );
	| '-' e		%prec UMINUS
		= bundle(3, " 0", $2, "-" );
	|  e '*' e
		= bundle(3, $1, $3, "*" );
	|  e '/' e
		= bundle(3, $1, $3, "/" );
	|  e '%' e
		= bundle(3, $1, $3, "%%" );
	|  e '^' e
		= bundle(3, $1, $3, "^" );
	|  LETTER '[' e ']'
		={ bundle(3,$3, ";", geta($1)); }
	|  LETTER INCR
		= bundle(4, "l", $1, "d1+s", $1 );
	|  INCR LETTER
		= bundle(4, "l", $2, "1+ds", $2 );
	|  DECR LETTER
		= bundle(4, "l", $2, "1-ds", $2 );
	|  LETTER DECR
		= bundle(4, "l", $1, "d1-s", $1 );
	| LETTER '[' e ']' INCR
		= bundle(7,$3,";",geta($1),"d1+",$3,":",geta($1));
	| INCR LETTER '[' e ']'
		= bundle(7,$4,";",geta($2),"1+d",$4,":",geta($2));
	| LETTER '[' e ']' DECR
		= bundle(7,$3,";",geta($1),"d1-",$3,":",geta($1));
	| DECR LETTER '[' e ']'
		= bundle(7,$4,";",geta($2),"1-d",$4,":",geta($2));
	| SCALE INCR
		= bundle(1,"Kd1+k");
	| INCR SCALE
		= bundle(1,"K1+dk");
	| SCALE DECR
		= bundle(1,"Kd1-k");
	| DECR SCALE
		= bundle(1,"K1-dk");
	| BASE INCR
		= bundle(1,"Id1+i");
	| INCR BASE
		= bundle(1,"I1+di");
	| BASE DECR
		= bundle(1,"Id1-i");
	| DECR BASE
		= bundle(1,"I1-di");
	| OBASE INCR
		= bundle(1,"Od1+o");
	| INCR OBASE
		= bundle(1,"O1+do");
	| OBASE DECR
		= bundle(1,"Od1-o");
	| DECR OBASE
		= bundle(1,"O1-do");
	|  LETTER '(' cargs ')'
		= bundle(4, $3, "l", getf($1), "x" );
	|  LETTER '(' ')'
		= bundle(3, "l", getf($1), "x" );
	|  cons
		={ bundle(2, " ", $1 ); }
	|  DOT cons
		={ bundle(2, " .", $2 ); }
	|  cons DOT cons
		={ bundle(4, " ", $1, ".", $3 ); }
	|  cons DOT
		={ bundle(3, " ", $1, "." ); }
	|  DOT
		={ $$ = "l."; }
	|  LETTER
		= { bundle(2, "l", $1 ); }
	|  LETTER '=' e
		={ bundle(3, $3, "ds", $1 ); }
	|  LETTER EQOP e	%prec '='
		={ bundle(6, "l", $1, $3, $2, "ds", $1 ); }
	| LETTER '[' e ']' '=' e
		= { bundle(5,$6,"d",$3,":",geta($1)); }
	| LETTER '[' e ']' EQOP e
		= { bundle(9,$3,";",geta($1),$6,$5,"d",$3,":",geta($1)); }
	| LENGTH '(' e ')'
		= bundle(2,$3,"Z");
	| SCALE '(' e ')'
		= bundle(2,$3,"X");	/* must be before '(' e ')' */
	|  '(' e ')'
		= { $$ = $2; }
	|  '?'
		={ bundle(1, "?" ); }
	|  SQRT '(' e ')'
		={ bundle(2, $3, "v" ); }
	| '~' LETTER
		={ bundle(2,"L",$2); }
	| SCALE '=' e
		= bundle(2,$3,"dk");
	| SCALE EQOP e		%prec '='
		= bundle(4,"K",$3,$2,"dk");
	| BASE '=' e
		= bundle(2,$3,"di");
	| BASE EQOP e		%prec '='
		= bundle(4,"I",$3,$2,"di");
	| OBASE '=' e
		= bundle(2,$3,"do");
	| OBASE EQOP e		%prec '='
		= bundle(4,"O",$3,$2,"do");
	| SCALE
		= bundle(1,"K");
	| BASE
		= bundle(1,"I");
	| OBASE
		= bundle(1,"O");
	;

cargs	:  eora
	|  cargs ',' eora
		= bundle(2, $1, $3 );
	;
eora:	  e
	| LETTER '[' ']'
		=bundle(2,"l",geta($1));
	;

cons	:  constant
		={ *cp++ = '\0'; }

constant:
	  '_'
		={ $$ = cp; *cp++ = '_'; }
	|  DIGIT
		={ $$ = cp; *cp++ = $1; }
	|  constant DIGIT
		={ *cp++ = $2; }
	;

CRS	:
		={ $$ = cp; *cp++ = crs++; *cp++ = '\0';
			if(crs == '[')crs+=3;
			if(crs == 'a')crs='{';
			if(crs >= 0241){yyerror("program too big");
				getout();
			}
			bstack[bindx++] = lev++; }
	;

def	:  _DEFINE LETTER '('
		={	$$ = getf($2);
			pre = "";
			post = "";
			lev = 1;
			bstack[bindx=0] = 0;
			}
	;

dargs	:
	|  lora
		={ pp( $1 ); }
	|  dargs ',' lora
		={ pp( $3 ); }
	;

dlets	:  lora
		={ tp($1); }
	|  dlets ',' lora
		={ tp($3); }
	;
lora	:  LETTER
	|  LETTER '[' ']'
		={ $$ = geta($1); }
	;

%%
# define error 256

int peekc = -1;
int sargc;
int ifile;
char **sargv;

char funtab[52] = {
	01,0,02,0,03,0,04,0,05,0,06,0,07,0,010,0,011,0,012,0,013,0,014,0,015,0,016,0,017,0,
	020,0,021,0,022,0,023,0,024,0,025,0,026,0,027,0,030,0,031,0,032,0 };
char atab[52] = {
	0241,0,0242,0,0243,0,0244,0,0245,0,0246,0,0247,0,0250,0,0251,0,0252,0,0253,0,
	0254,0,0255,0,0256,0,0257,0,0260,0,0261,0,0262,0,0263,0,0264,0,0265,0,0266,0,
	0267,0,0270,0,0271,0,0272,0};
char *letr[26] = {
  "a","b","c","d","e","f","g","h","i","j",
  "k","l","m","n","o","p","q","r","s","t",
  "u","v","w","x","y","z" } ;
char *dot = { "." };
yylex(){
	int c, ch;
restart:
	c = getch();
	peekc = -1;
	while( c == ' ' || c == '\t' ) c = getch();
	if(c == '\\'){
		getch();
		goto restart;
	}
	if( c<= 'z' && c >= 'a' ) {
		/* look ahead to look for reserved words */
		peekc = getch();
		if( peekc >= 'a' && peekc <= 'z' ){ /* must be reserved word */
			if( c=='i' && peekc=='f' ){ c=_IF; goto skip; }
			if( c=='w' && peekc=='h' ){ c=_WHILE; goto skip; }
			if( c=='f' && peekc=='o' ){ c=_FOR; goto skip; }
			if( c=='s' && peekc=='q' ){ c=SQRT; goto skip; }
			if( c=='r' && peekc=='e' ){ c=_RETURN; goto skip; }
			if( c=='b' && peekc=='r' ){ c=_BREAK; goto skip; }
			if( c=='d' && peekc=='e' ){ c=_DEFINE; goto skip; }
			if( c=='s' && peekc=='c' ){ c= SCALE; goto skip; }
			if( c=='b' && peekc=='a' ){ c=BASE; goto skip; }
			if( c=='i' && peekc == 'b'){ c=BASE; goto skip; }
			if( c=='o' && peekc=='b' ){ c=OBASE; goto skip; }
			if( c=='d' && peekc=='i' ){ c=FFF; goto skip; }
			if( c=='a' && peekc=='u' ){ c=_AUTO; goto skip; }
			if( c == 'l' && peekc=='e'){ c=LENGTH; goto skip; }
			if( c == 'q' && peekc == 'u'){getout();}
			/* could not be found */
			return( error );
		skip:	/* skip over rest of word */
			peekc = -1;
			while( (ch = getch()) >= 'a' && ch <= 'z' );
			peekc = ch;
			return( c );
		}

		/* usual case; just one single letter */

		yylval = letr[c-'a'];
		return( LETTER );
	}
	if( c>= '0' && c <= '9' || c>= 'A' && c<= 'F' ){
		yylval = c;
		return( DIGIT );
	}
	switch( c ){
	case '.':	return( DOT );
	case '=':
		switch( peekc = getch() ){
		case '=': c=EQ; goto gotit;
		case '+': c=EQPL; goto gotit;
		case '-': c=EQMI; goto gotit;
		case '*': c=EQMUL; goto gotit;
		case '/': c=EQDIV; goto gotit;
		case '%': c=EQREM; goto gotit;
		case '^': c=EQEXP; goto gotit;
		default:   return( '=' );
			  gotit:     peekc = -1; return(c);
		  }
	case '+':	return( cpeek( '+', INCR, cpeek( '=', EQPL, '+') ) );
	case '-':	return( cpeek( '-', DECR, cpeek( '=', EQMI, '-') ) );
	case '<':	return( cpeek( '=', LE, '<' ) );
	case '>':	return( cpeek( '=', GE, '>' ) );
	case '!':	return( cpeek( '=', NE, '!' ) );
	case '/':
		if((peekc = getch()) == '*'){
			peekc = -1;
			while((getch() != '*') || ((peekc = getch()) != '/'));
			peekc = -1;
			goto restart;
		}
		else if (peekc == '=') {
			c=EQDIV;
			goto gotit;
		}
		else return(c);
	case '*':
		return( cpeek( '=', EQMUL, '*' ) );
	case '%':
		return( cpeek( '=', EQREM, '%' ) );
	case '^':
		return( cpeek( '=', EQEXP, '^' ) );
	case '"':	
		 yylval = str;
		 while((c=getch()) != '"'){*str++ = c;
			if(str >= &string[999]){yyerror("string space exceeded");
			getout();
		}
	}
	 *str++ = '\0';
	return(QSTR);
	default:	 return( c );
	}
}

cpeek( c, yes, no ){
	if( (peekc=getch()) != c ) return( no );
	else {
		peekc = -1;
		return( yes );
	}
}

getch(){
	int ch;
loop:
	ch = (peekc < 0) ? getc(in) : peekc;
	peekc = -1;
	if(ch != EOF)return(ch);
	if(++ifile > sargc){
		if(ifile >= sargc+2)getout();
		in = stdin;
		ln = 0;
		goto loop;
	}
	fclose(in);
	if((in = fopen(sargv[ifile],"r")) != NULL){
		ln = 0;
		ss = sargv[ifile];
		goto loop;
	}
	yyerror("cannot open input file");
}
# define b_sp_max 3000
int b_space [ b_sp_max ];
int * b_sp_nxt = { b_space };

int bdebug = 0;
/*VARARGS*/
bundle(va_alist) va_dcl {
	va_list ap;
	int i, *q;

	va_start(ap);
	i = va_arg(ap, int);
	q = b_sp_nxt;
	if( bdebug ) printf("bundle %d elements at %o\n",i,  q );
	while(i-- > 0){
		if( b_sp_nxt >= & b_space[b_sp_max] ) yyerror( "bundling space exceeded" );
		* b_sp_nxt++ = va_arg(ap, int);
	}
	* b_sp_nxt++ = 0;
	yyval = q;
	va_end(ap);
	return( q );
}

routput(p) int *p; {
	if( bdebug ) printf("routput(%o)\n", p );
	if( p >= &b_space[0] && p < &b_space[b_sp_max]){
		/* part of a bundle */
		while( *p != 0 ) routput( *p++ );
	}
	else printf( p );	 /* character string */
}

output( p ) int *p; {
	routput( p );
	b_sp_nxt = & b_space[0];
	printf( "\n" );
	fflush(stdout);
	cp = cary;
	crs = rcrs;
}

conout( p, s ) int *p; char *s; {
	printf("[");
	routput( p );
	printf("]s%s\n", s );
	fflush(stdout);
	lev--;
}

yyerror( s ) char *s; {
	if(ifile > sargc)ss="teletype";
	printf("c[%s on line %d, %s]pc\n", s ,ln+1,ss);
	fflush(stdout);
	cp = cary;
	crs = rcrs;
	bindx = 0;
	lev = 0;
	b_sp_nxt = &b_space[0];
}

pp( s ) char *s; {
	/* puts the relevant stuff on pre and post for the letter s */

	bundle(3, "S", s, pre );
	pre = yyval;
	bundle(4, post, "L", s, "s." );
	post = yyval;
}

tp( s ) char *s; { /* same as pp, but for temps */
	bundle(3, "0S", s, pre );
	pre = yyval;
	bundle(4, post, "L", s, "s." );
	post = yyval;
}

yyinit(argc,argv) int argc; char *argv[];{
	signal( 2, (int(*)())1 );	/* ignore all interrupts */
	sargv=argv;
	sargc= -- argc;
	if(sargc == 0)in=stdin;
	else if((in = fopen(sargv[1],"r")) == NULL) {
		yyerror("cannot open input file");
		in = stdin;
	}
	ifile = 1;
	ln = 0;
	ss = sargv[1];
}
int *getout(){
	printf("q");
	fflush(stdout);
	exit(0);
}

int *
getf(p) char *p;{
	return(&funtab[2*(*p -0141)]);
}
int *
geta(p) char *p;{
	return(&atab[2*(*p - 0141)]);
}

main(argc, argv)
char **argv;
{
	int p[2];


	if (argc > 1 && *argv[1] == '-') {
		if((argv[1][1] == 'd')||(argv[1][1] == 'c')){
			yyinit(--argc, ++argv);
			yyparse();
			exit(0);
		}
		if(argv[1][1] != 'l'){
			printf("unrecognizable argument\n");
			fflush(stdout);
			exit(1);
		}
		argv[1] = "/usr/lib/lib.b";
	}
	pipe(p);
	if (fork()==0) {
		close(1);
		dup(p[1]);
		close(p[0]);
		close(p[1]);
		yyinit(argc, argv);
		yyparse();
		exit(0);
	}
	close(0);
	dup(p[0]);
	close(p[0]);
	close(p[1]);
	execl("/bin/dc", "dc", "-", (char *)0);
	execl("/usr/bin/dc", "dc", "-", (char *)0);
	perror("bc: can't find dc");
	exit(1);
}
Commit	Line	Data
a27f2922	1	%{
4e44ae42	2	static char *sccsid = "@(#)bc.y 4.5 (Berkeley) 88/04/24";
a27f2922 BJ	3	int *getout();
	4	%}
	5	%right '='
	6	%left '+' '-'
	7	%left '*' '/' '%'
	8	%right '^'
	9	%left UMINUS
	10
	11	%term LETTER DIGIT SQRT LENGTH _IF FFF EQ
	12	%term _WHILE _FOR NE LE GE INCR DECR
	13	%term _RETURN _BREAK _DEFINE BASE OBASE SCALE
	14	%term EQPL EQMI EQMUL EQDIV EQREM EQEXP
	15	%term _AUTO DOT
	16	%term QSTR
	17
	18	%{
	19	#include <stdio.h>
6d987ad7	20	#include <varargs.h>
4e44ae42	21	FILE *in;
a27f2922 BJ	22	char cary[1000], *cp = { cary };
	23	char string[1000], *str = {string};
	24	int crs = '0';
	25	int rcrs = '0'; /* reset crs */
	26	int bindx = 0;
	27	int lev = 0;
	28	int ln;
	29	char *ss;
	30	int bstack[10] = { 0 };
	31	char *numb[15] = {
	32	" 0", " 1", " 2", " 3", " 4", " 5",
	33	" 6", " 7", " 8", " 9", " 10", " 11",
	34	" 12", " 13", " 14" };
	35	int pre, post;
	36	%}
	37	%%
	38	start :
	39	\| start stat tail
	40	= output( $2 );
	41	\| start def dargs ')' '{' dlist slist '}'
	42	={ bundle( 6,pre, $7, post ,"0",numb[lev],"Q");
	43	conout( $$, $2 );
	44	rcrs = crs;
	45	output( "" );
	46	lev = bindx = 0;
	47	}
	48	;
	49
	50	dlist : tail
	51	\| dlist _AUTO dlets tail
	52	;
	53
	54	stat : e
	55	={ bundle(2, $1, "ps." ); }
	56	\|
	57	={ bundle(1, "" ); }
	58	\| QSTR
	59	={ bundle(3,"[",$1,"]P");}
	60	\| LETTER '=' e
	61	={ bundle(3, $3, "s", $1 ); }
	62	\| LETTER '[' e ']' '=' e
	63	={ bundle(4, $6, $3, ":", geta($1)); }
	64	\| LETTER EQOP e
	65	={ bundle(6, "l", $1, $3, $2, "s", $1 ); }
	66	\| LETTER '[' e ']' EQOP e
	67	={ bundle(8,$3, ";", geta($1), $6, $5, $3, ":", geta($1));}
	68	\| _BREAK
	69	={ bundle(2, numb[lev-bstack[bindx-1]], "Q" ); }
	70	\| _RETURN '(' e ')'
	71	= bundle(4, $3, post, numb[lev], "Q" );
	72	\| _RETURN '(' ')'
	73	= bundle(4, "0", post, numb[lev], "Q" );
	74	\| _RETURN
	75	= bundle(4,"0",post,numb[lev],"Q");
	76	\| SCALE '=' e
	77	= bundle(2, $3, "k");
	78	\| SCALE EQOP e
	79	= bundle(4,"K",$3,$2,"k");
	80	\| BASE '=' e
	81	= bundle(2,$3, "i");
	82	\| BASE EQOP e
	83	= bundle(4,"I",$3,$2,"i");
	84	\| OBASE '=' e
	85	= bundle(2,$3,"o");
86	\| OBASE EQOP e
87	= bundle(4,"O",$3,$2,"o");
88	\| '{' slist '}'
89	={ $$ = $2; }
90	\| FFF
91	={ bundle(1,"fY"); }
92	\| error
93	={ bundle(1,"c"); }
94	\| _IF CRS BLEV '(' re ')' stat
95	={ conout( $7, $2 );
96	bundle(3, $5, $2, " " );
97	}
98	\| _WHILE CRS '(' re ')' stat BLEV
99	={ bundle(3, $6, $4, $2 );
100	conout( $$, $2 );
101	bundle(3, $4, $2, " " );
102	}
103	\| fprefix CRS re ';' e ')' stat BLEV
104	={ bundle(5, $7, $5, "s.", $3, $2 );
105	conout( $$, $2 );
106	bundle(5, $1, "s.", $3, $2, " " );
107	}
108	\| '~' LETTER '=' e
109	={ bundle(3,$4,"S",$2); }
110	;
111
112	EQOP : EQPL
113	={ $$ = "+"; }
114	\| EQMI
115	={ $$ = "-"; }
116	\| EQMUL
117	={ $$ = "*"; }
118	\| EQDIV
119	={ $$ = "/"; }
120	\| EQREM
121	={ $$ = "%%"; }
122	\| EQEXP
123	={ $$ = "^"; }
124	;
125
126	fprefix : _FOR '(' e ';'
127	={ $$ = $3; }
128	;
129
130	BLEV :
131	={ --bindx; }
132	;
133
134	slist : stat
135	\| slist tail stat
136	={ bundle(2, $1, $3 ); }
137	;
138
139	tail : '\n'
140	={ln++;}
141	\| ';'
142	;
143
144	re : e EQ e
145	= bundle(3, $1, $3, "=" );
146	\| e '<' e
147	= bundle(3, $1, $3, ">" );
148	\| e '>' e
149	= bundle(3, $1, $3, "<" );
150	\| e NE e
151	= bundle(3, $1, $3, "!=" );
152	\| e GE e
153	= bundle(3, $1, $3, "!>" );
154	\| e LE e
155	= bundle(3, $1, $3, "!<" );
156	\| e
157	= bundle(2, $1, " 0!=" );
158	;
159
160	e : e '+' e
161	= bundle(3, $1, $3, "+" );
162	\| e '-' e
163	= bundle(3, $1, $3, "-" );
164	\| '-' e %prec UMINUS
165	= bundle(3, " 0", $2, "-" );
166	\| e '*' e
167	= bundle(3, $1, $3, "*" );
168	\| e '/' e
169	= bundle(3, $1, $3, "/" );
170	\| e '%' e
171	= bundle(3, $1, $3, "%%" );
172	\| e '^' e
173	= bundle(3, $1, $3, "^" );
174	\| LETTER '[' e ']'
175	={ bundle(3,$3, ";", geta($1)); }
176	\| LETTER INCR
177	= bundle(4, "l", $1, "d1+s", $1 );
178	\| INCR LETTER
179	= bundle(4, "l", $2, "1+ds", $2 );
180	\| DECR LETTER
181	= bundle(4, "l", $2, "1-ds", $2 );
182	\| LETTER DECR
183	= bundle(4, "l", $1, "d1-s", $1 );
184	\| LETTER '[' e ']' INCR
185	= bundle(7,$3,";",geta($1),"d1+",$3,":",geta($1));
186	\| INCR LETTER '[' e ']'
187	= bundle(7,$4,";",geta($2),"1+d",$4,":",geta($2));
188	\| LETTER '[' e ']' DECR
189	= bundle(7,$3,";",geta($1),"d1-",$3,":",geta($1));
190	\| DECR LETTER '[' e ']'
191	= bundle(7,$4,";",geta($2),"1-d",$4,":",geta($2));
192	\| SCALE INCR
193	= bundle(1,"Kd1+k");
194	\| INCR SCALE
195	= bundle(1,"K1+dk");
196	\| SCALE DECR
197	= bundle(1,"Kd1-k");
198	\| DECR SCALE
199	= bundle(1,"K1-dk");
200	\| BASE INCR
201	= bundle(1,"Id1+i");
202	\| INCR BASE
203	= bundle(1,"I1+di");
204	\| BASE DECR
205	= bundle(1,"Id1-i");
206	\| DECR BASE
207	= bundle(1,"I1-di");
208	\| OBASE INCR
209	= bundle(1,"Od1+o");
210	\| INCR OBASE
211	= bundle(1,"O1+do");
212	\| OBASE DECR
213	= bundle(1,"Od1-o");
214	\| DECR OBASE
215	= bundle(1,"O1-do");
216	\| LETTER '(' cargs ')'
217	= bundle(4, $3, "l", getf($1), "x" );
218	\| LETTER '(' ')'
219	= bundle(3, "l", getf($1), "x" );
220	\| cons
221	={ bundle(2, " ", $1 ); }
222	\| DOT cons
223	={ bundle(2, " .", $2 ); }
224	\| cons DOT cons
225	={ bundle(4, " ", $1, ".", $3 ); }
226	\| cons DOT
227	={ bundle(3, " ", $1, "." ); }
228	\| DOT
229	={ $$ = "l."; }
230	\| LETTER
231	= { bundle(2, "l", $1 ); }
232	\| LETTER '=' e
233	={ bundle(3, $3, "ds", $1 ); }
234	\| LETTER EQOP e %prec '='
235	={ bundle(6, "l", $1, $3, $2, "ds", $1 ); }
236	\| LETTER '[' e ']' '=' e
237	= { bundle(5,$6,"d",$3,":",geta($1)); }
238	\| LETTER '[' e ']' EQOP e
239	= { bundle(9,$3,";",geta($1),$6,$5,"d",$3,":",geta($1)); }
240	\| LENGTH '(' e ')'
241	= bundle(2,$3,"Z");
242	\| SCALE '(' e ')'
243	= bundle(2,$3,"X"); /* must be before '(' e ')' */
244	\| '(' e ')'
245	= { $$ = $2; }
246	\| '?'
247	={ bundle(1, "?" ); }
248	\| SQRT '(' e ')'
249	={ bundle(2, $3, "v" ); }
250	\| '~' LETTER
251	={ bundle(2,"L",$2); }
252	\| SCALE '=' e
253	= bundle(2,$3,"dk");
254	\| SCALE EQOP e %prec '='
255	= bundle(4,"K",$3,$2,"dk");
256	\| BASE '=' e
257	= bundle(2,$3,"di");
258	\| BASE EQOP e %prec '='
259	= bundle(4,"I",$3,$2,"di");
260	\| OBASE '=' e
261	= bundle(2,$3,"do");
262	\| OBASE EQOP e %prec '='
263	= bundle(4,"O",$3,$2,"do");
264	\| SCALE
265	= bundle(1,"K");
266	\| BASE
267	= bundle(1,"I");
268	\| OBASE
269	= bundle(1,"O");
270	;
271
272	cargs : eora
273	\| cargs ',' eora
274	= bundle(2, $1, $3 );
275	;
276	eora: e
277	\| LETTER '[' ']'
278	=bundle(2,"l",geta($1));
279	;
280
281	cons : constant
282	={ *cp++ = '\0'; }
283
284	constant:
285	'_'
286	={ $$ = cp; *cp++ = '_'; }
287	\| DIGIT
288	={ $$ = cp; *cp++ = $1; }
289	\| constant DIGIT
290	={ *cp++ = $2; }
291	;
292
293	CRS :
294	={ $$ = cp; cp++ = crs++; cp++ = '\0';
295	if(crs == '[')crs+=3;
296	if(crs == 'a')crs='{';
297	if(crs >= 0241){yyerror("program too big");
298	getout();
299	}
300	bstack[bindx++] = lev++; }
301	;
302
303	def : _DEFINE LETTER '('
304	={ $$ = getf($2);
305	pre = "";
306	post = "";
307	lev = 1;
308	bstack[bindx=0] = 0;
309	}
310	;
311
312	dargs :
313	\| lora
314	={ pp( $1 ); }
315	\| dargs ',' lora
316	={ pp( $3 ); }
317	;
318
319	dlets : lora
320	={ tp($1); }
321	\| dlets ',' lora
322	={ tp($3); }
323	;
324	lora : LETTER
325	\| LETTER '[' ']'
326	={ $$ = geta($1); }
327	;
328
329	%%
330	# define error 256
331
332	int peekc = -1;
333	int sargc;
334	int ifile;
335	char **sargv;
336
337	char funtab[52] = {
338	01,0,02,0,03,0,04,0,05,0,06,0,07,0,010,0,011,0,012,0,013,0,014,0,015,0,016,0,017,0,
339	020,0,021,0,022,0,023,0,024,0,025,0,026,0,027,0,030,0,031,0,032,0 };
340	char atab[52] = {
341	0241,0,0242,0,0243,0,0244,0,0245,0,0246,0,0247,0,0250,0,0251,0,0252,0,0253,0,
342	0254,0,0255,0,0256,0,0257,0,0260,0,0261,0,0262,0,0263,0,0264,0,0265,0,0266,0,
343	0267,0,0270,0,0271,0,0272,0};
344	char *letr[26] = {
345	"a","b","c","d","e","f","g","h","i","j",
346	"k","l","m","n","o","p","q","r","s","t",
347	"u","v","w","x","y","z" } ;
348	char *dot = { "." };
349	yylex(){
350	int c, ch;
351	restart:
352	c = getch();
353	peekc = -1;
354	while( c == ' ' \|\| c == '\t' ) c = getch();
355	if(c == '\\'){
356	getch();
357	goto restart;
358	}
359	if( c<= 'z' && c >= 'a' ) {
360	/* look ahead to look for reserved words */
361	peekc = getch();
362	if( peekc >= 'a' && peekc <= 'z' ){ /* must be reserved word */
363	if( c=='i' && peekc=='f' ){ c=_IF; goto skip; }
364	if( c=='w' && peekc=='h' ){ c=_WHILE; goto skip; }
365	if( c=='f' && peekc=='o' ){ c=_FOR; goto skip; }
366	if( c=='s' && peekc=='q' ){ c=SQRT; goto skip; }
367	if( c=='r' && peekc=='e' ){ c=_RETURN; goto skip; }
368	if( c=='b' && peekc=='r' ){ c=_BREAK; goto skip; }
369	if( c=='d' && peekc=='e' ){ c=_DEFINE; goto skip; }
370	if( c=='s' && peekc=='c' ){ c= SCALE; goto skip; }
371	if( c=='b' && peekc=='a' ){ c=BASE; goto skip; }
372	if( c=='i' && peekc == 'b'){ c=BASE; goto skip; }
373	if( c=='o' && peekc=='b' ){ c=OBASE; goto skip; }
374	if( c=='d' && peekc=='i' ){ c=FFF; goto skip; }
375	if( c=='a' && peekc=='u' ){ c=_AUTO; goto skip; }
376	if( c == 'l' && peekc=='e'){ c=LENGTH; goto skip; }
377	if( c == 'q' && peekc == 'u'){getout();}
378	/* could not be found */
379	return( error );
380	skip: /* skip over rest of word */
381	peekc = -1;
382	while( (ch = getch()) >= 'a' && ch <= 'z' );
383	peekc = ch;
384	return( c );
385	}
386
387	/* usual case; just one single letter */
388
389	yylval = letr[c-'a'];
390	return( LETTER );
391	}
392	if( c>= '0' && c <= '9' \|\| c>= 'A' && c<= 'F' ){
393	yylval = c;
394	return( DIGIT );
395	}
396	switch( c ){
397	case '.': return( DOT );
398	case '=':
399	switch( peekc = getch() ){
400	case '=': c=EQ; goto gotit;
401	case '+': c=EQPL; goto gotit;
402	case '-': c=EQMI; goto gotit;
403	case '*': c=EQMUL; goto gotit;
404	case '/': c=EQDIV; goto gotit;
405	case '%': c=EQREM; goto gotit;
406	case '^': c=EQEXP; goto gotit;
407	default: return( '=' );
408	gotit: peekc = -1; return(c);
409	}
3321b8ce BJ	410	case '+': return( cpeek( '+', INCR, cpeek( '=', EQPL, '+') ) );
3321b8ce BJ	411	case '-': return( cpeek( '-', DECR, cpeek( '=', EQMI, '-') ) );
a27f2922 BJ	412	case '<': return( cpeek( '=', LE, '<' ) );
	413	case '>': return( cpeek( '=', GE, '>' ) );
	414	case '!': return( cpeek( '=', NE, '!' ) );
	415	case '/':
	416	if((peekc = getch()) == '*'){
	417	peekc = -1;
	418	while((getch() != '*') \|\| ((peekc = getch()) != '/'));
	419	peekc = -1;
	420	goto restart;
	421	}
3321b8ce BJ	422	else if (peekc == '=') {
	423	c=EQDIV;
	424	goto gotit;
	425	}
a27f2922	426	else return(c);
3321b8ce BJ	427	case '*':
	428	return( cpeek( '=', EQMUL, '*' ) );
	429	case '%':
	430	return( cpeek( '=', EQREM, '%' ) );
	431	case '^':
	432	return( cpeek( '=', EQEXP, '^' ) );
a27f2922 BJ	433	case '"':
	434	yylval = str;
	435	while((c=getch()) != '"'){*str++ = c;
	436	if(str >= &string[999]){yyerror("string space exceeded");
	437	getout();
	438	}
	439	}
	440	*str++ = '\0';
	441	return(QSTR);
	442	default: return( c );
	443	}
	444	}
	445
	446	cpeek( c, yes, no ){
	447	if( (peekc=getch()) != c ) return( no );
	448	else {
	449	peekc = -1;
	450	return( yes );
	451	}
	452	}
	453
	454	getch(){
	455	int ch;
	456	loop:
	457	ch = (peekc < 0) ? getc(in) : peekc;
	458	peekc = -1;
	459	if(ch != EOF)return(ch);
	460	if(++ifile > sargc){
	461	if(ifile >= sargc+2)getout();
	462	in = stdin;
	463	ln = 0;
	464	goto loop;
	465	}
	466	fclose(in);
	467	if((in = fopen(sargv[ifile],"r")) != NULL){
	468	ln = 0;
	469	ss = sargv[ifile];
	470	goto loop;
	471	}
	472	yyerror("cannot open input file");
	473	}
	474	# define b_sp_max 3000
	475	int b_space [ b_sp_max ];
	476	int * b_sp_nxt = { b_space };
	477
	478	int bdebug = 0;
6d987ad7 KB	479	/VARARGS/
	480	bundle(va_alist) va_dcl {
	481	va_list ap;
	482	int i, *q;
a27f2922	483
6d987ad7 KB	484	va_start(ap);
6d987ad7 KB	485	i = va_arg(ap, int);
a27f2922 BJ	486	q = b_sp_nxt;
	487	if( bdebug ) printf("bundle %d elements at %o\n",i, q );
	488	while(i-- > 0){
	489	if( b_sp_nxt >= & b_space[b_sp_max] ) yyerror( "bundling space exceeded" );
6d987ad7	490	* b_sp_nxt++ = va_arg(ap, int);
a27f2922 BJ	491	}
	492	* b_sp_nxt++ = 0;
	493	yyval = q;
6d987ad7	494	va_end(ap);
a27f2922 BJ	495	return( q );
	496	}
	497
	498	routput(p) int *p; {
	499	if( bdebug ) printf("routput(%o)\n", p );
	500	if( p >= &b_space[0] && p < &b_space[b_sp_max]){
	501	/* part of a bundle */
	502	while( p != 0 ) routput( p++ );
	503	}
	504	else printf( p ); /* character string */
	505	}
	506
	507	output( p ) int *p; {
	508	routput( p );
	509	b_sp_nxt = & b_space[0];
	510	printf( "\n" );
	511	fflush(stdout);
	512	cp = cary;
	513	crs = rcrs;
	514	}
	515
	516	conout( p, s ) int p; char s; {
	517	printf("[");
	518	routput( p );
	519	printf("]s%s\n", s );
	520	fflush(stdout);
	521	lev--;
	522	}
	523
	524	yyerror( s ) char *s; {
	525	if(ifile > sargc)ss="teletype";
	526	printf("c[%s on line %d, %s]pc\n", s ,ln+1,ss);
	527	fflush(stdout);
	528	cp = cary;
	529	crs = rcrs;
	530	bindx = 0;
	531	lev = 0;
	532	b_sp_nxt = &b_space[0];
	533	}
	534
	535	pp( s ) char *s; {
	536	/* puts the relevant stuff on pre and post for the letter s */
	537
	538	bundle(3, "S", s, pre );
	539	pre = yyval;
	540	bundle(4, post, "L", s, "s." );
	541	post = yyval;
	542	}
	543
	544	tp( s ) char s; { / same as pp, but for temps */
	545	bundle(3, "0S", s, pre );
	546	pre = yyval;
	547	bundle(4, post, "L", s, "s." );
	548	post = yyval;
	549	}
	550
	551	yyinit(argc,argv) int argc; char *argv[];{
	552	signal( 2, (int()())1 ); / ignore all interrupts */
	553	sargv=argv;
	554	sargc= -- argc;
	555	if(sargc == 0)in=stdin;
db2c044e	556	else if((in = fopen(sargv[1],"r")) == NULL) {
a27f2922	557	yyerror("cannot open input file");
db2c044e SL	558	in = stdin;
db2c044e SL	559	}
a27f2922 BJ	560	ifile = 1;
	561	ln = 0;
	562	ss = sargv[1];
	563	}
	564	int *getout(){
	565	printf("q");
	566	fflush(stdout);
6d987ad7	567	exit(0);
a27f2922 BJ	568	}
	569
	570	int *
	571	getf(p) char *p;{
	572	return(&funtab[2(p -0141)]);
	573	}
	574	int *
	575	geta(p) char *p;{
	576	return(&atab[2(p - 0141)]);
	577	}
	578
	579	main(argc, argv)
	580	char **argv;
	581	{
	582	int p[2];
	583
	584
	585	if (argc > 1 && *argv[1] == '-') {
	586	if((argv[1][1] == 'd')\|\|(argv[1][1] == 'c')){
	587	yyinit(--argc, ++argv);
	588	yyparse();
6d987ad7	589	exit(0);
a27f2922 BJ	590	}
	591	if(argv[1][1] != 'l'){
	592	printf("unrecognizable argument\n");
	593	fflush(stdout);
6d987ad7	594	exit(1);
a27f2922 BJ	595	}
	596	argv[1] = "/usr/lib/lib.b";
	597	}
	598	pipe(p);
	599	if (fork()==0) {
	600	close(1);
	601	dup(p[1]);
	602	close(p[0]);
	603	close(p[1]);
	604	yyinit(argc, argv);
	605	yyparse();
6d987ad7	606	exit(0);
a27f2922 BJ	607	}
	608	close(0);
	609	dup(p[0]);
	610	close(p[0]);
	611	close(p[1]);
6d987ad7 KB	612	execl("/bin/dc", "dc", "-", (char *)0);
	613	execl("/usr/bin/dc", "dc", "-", (char *)0);
	614	perror("bc: can't find dc");
	615	exit(1);
a27f2922	616	}