xref: /csrg-svn/usr.bin/pascal/src/main.c (revision 759)

/* Copyright (c) 1979 Regents of the University of California */

static	char sccsid[] = "@(#)main.c 1.1 08/27/80";

#include "whoami.h"
#include "0.h"
#include "yy.h"
#include <signal.h>
#include "objfmt.h"

/*
 * This version of pi has been in use at Berkeley since May 1977
 * and is very stable, except for the syntactic error recovery which
 * has just been written.  Please report any problems with the error
 * recovery to the second author at the address given in the file
 * READ_ME.  The second author takes full responsibility for any bugs
 * in the syntactic error recovery.
 */

char	piusage[]	= "pi [ -blnpstuw ] [ -i file ... ] name.p";
char	pixusage[]	= "pix [ -blnpstuw ] [ -i file ... ] name.p [ arg ... ]";
char	pcusage[]	= "pc [ options ] [ -o file ] [ -i file ... ] name.p";

char	*usageis	= piusage;

char	*errfile = ERR_STRNGS;

#ifdef OBJ
    char	*obj	= "obj";
#endif OBJ
#ifdef PC
    char	*pcname = "pc.pc1";
#endif PC
#ifdef PTREE
    char	*pTreeName = "pi.pTree";
#endif PTREE

/*
 * Be careful changing errfile and howfile.
 * There are the "magic" constants 9 and 15 immediately below.
 * errfile is now defined by ERR_STRNGS, in objfmt.h,
 * and its leading path name length is ERR_PATHLEN long.
 * this for executing out of the current directory if running as `a.something'.
 */
#ifdef OBJ
char	*howfile	= "/usr/lib/how_pi\0";
#endif OBJ
#ifdef PC
char	*howfile	= "/usr/lib/how_pc";
#endif PC

int	onintr();

extern	char *lastname;

FILE	*ibuf;
FILE	*pcstream = NULL;

/*
 * these are made real variables
 * so they can be changed
 * if you are compiling on a smaller machine
 */
double	MAXINT	=  2147483647.;
double	MININT	= -2147483648.;

/*
 * Main program for pi.
 * Process options, then call yymain
 * to do all the real work.
 */
main(argc, argv)
	int argc;
	char *argv[];
{
	register char *cp;
	register c;
	int i;

	if (argv[0][0] == 'a')
		errfile += ERR_PATHLEN , howfile += 9;
#	ifdef OBJ
	    if (argv[0][0] == '-' && argv[0][1] == 'o') {
		    obj = &argv[0][2];
		    usageis = pixusage;
		    howfile[15] = 'x';
		    ofil = 3;
	    } else {
		    ofil = creat(obj, 0755);
		    if (ofil < 0) {
			    perror(obj);
			    pexit(NOSTART);
		    }
	    }
#	endif OBJ
	argv++, argc--;
	if (argc == 0) {
		i = fork();
		if (i == -1)
			goto usage;
		if (i == 0) {
			execl("/bin/cat", "cat", howfile, 0);
			goto usage;
		}
		while (wait(&i) != -1)
			continue;
		pexit(NOSTART);
	}
#	ifdef OBJ
	    opt('p') = opt('t') = opt('b') = 1;
	    while (argc > 0) {
		    cp = argv[0];
		    if (*cp++ != '-')
			    break;
		    while (c = *cp++) switch (c) {
#ifdef DEBUG
			    case 'k':
			    case 'r':
			    case 'y':
				    togopt(c);
				    continue;
			    case 'K':
				    yycosts();
				    pexit(NOSTART);
			    case 'A':
				    testtrace++;
			    case 'F':
				    fulltrace++;
			    case 'E':
				    errtrace++;
				    opt('r')++;
				    continue;
			    case 'U':
				    yyunique = 0;
				    continue;
#endif
			    case 'b':
				    opt('b') = 2;
				    continue;
			    case 'i':
				    pflist = argv + 1;
				    pflstc = 0;
				    while (argc > 1) {
					    if (dotted(argv[1], 'p'))
						    break;
					    pflstc++, argc--, argv++;
				    }
				    if (pflstc == 0)
					    goto usage;
				    continue;
			    case 'l':
			    case 'n':
			    case 'p':
			    case 's':
			    case 't':
			    case 'u':
			    case 'w':
				    togopt(c);
				    continue;
			    case 'z':
				    monflg++;
				    continue;
			    default:
    usage:
				    Perror( "Usage", usageis);
				    pexit(NOSTART);
		    }
		    argc--, argv++;
	    }
#	endif OBJ
#	ifdef PC
	    opt( 'b' ) = 1;
	    opt( 'g' ) = 0;
	    opt( 't' ) = 0;
	    opt( 'p' ) = 0;
	    usageis = pcusage;
	    while ( argc > 0 ) {
		cp = argv[0];
		if ( *cp++ != '-' ) {
		    break;
		}
		c = *cp++;
		switch( c ) {
#ifdef DEBUG
		    case 'k':
		    case 'r':
		    case 'y':
			    togopt(c);
			    break;
		    case 'K':
			    yycosts();
			    pexit(NOSTART);
		    case 'A':
			    testtrace++;
			    /* and fall through */
		    case 'F':
			    fulltrace++;
			    /* and fall through */
		    case 'E':
			    errtrace++;
			    opt('r')++;
			    break;
		    case 'U':
			    yyunique = 0;
			    break;
#endif
		    case 'b':
			    opt('b') = 2;
			    break;
		    case 'i':
			    pflist = argv + 1;
			    pflstc = 0;
			    while (argc > 1) {
				    if (dotted(argv[1], 'p'))
					    break;
				    pflstc++, argc--, argv++;
			    }
			    if (pflstc == 0)
				    goto usage;
			    break;
			/*
			 *	output file for the first pass
			 */
		    case 'o':
			    if ( argc < 2 ) {
				goto usage;
			    }
			    argv++;
			    argc--;
			    pcname = argv[0];
			    break;
		    case 'C':
				/*
				 * since -t is an ld switch, use -C
				 * to turn on tests
				 */
			    togopt( 't' );
			    break;
		    case 'g':
				/*
				 *	sdb symbol table
				 */
			    togopt( 'g' );
			    break;
		    case 'l':
		    case 's':
		    case 'u':
		    case 'w':
			    togopt(c);
			    break;
		    case 'p':
				/*
				 *	-p on the command line means profile
				 */
			    profflag++;
			    break;
		    case 'z':
			    monflg++;
			    break;
		    default:
usage:
			    Perror( "Usage", usageis);
			    pexit(NOSTART);
		}
		argc--;
		argv++;
	    }
#	endif PC
	if (argc != 1)
		goto usage;
	efil = open ( errfile, 0 );
	if ( efil < 0 )
		perror(errfile), pexit(NOSTART);
	filename = argv[0];
	if (!dotted(filename, 'p')) {
		Perror(filename, "Name must end in '.p'");
		pexit(NOSTART);
	}
	close(0);
	if ( ( ibuf = fopen( filename , "r" ) ) == NULL )
		perror(filename), pexit(NOSTART);
	ibp = ibuf;
#	ifdef PC
	    if ( ( pcstream = fopen( pcname , "w" ) ) == NULL ) {
		perror( pcname );
		pexit( NOSTART );
	    }
	    stabsource( filename );
#	endif PC
#	ifdef PTREE
#	    define	MAXpPAGES	16
	    if ( ! pCreate( pTreeName , MAXpPAGES ) ) {
		perror( pTreeName );
		pexit( NOSTART );
	    }
#	endif PTREE
	if ( signal( SIGINT , SIG_IGN ) != SIG_IGN )
		signal( SIGINT , onintr );
	if (opt('l')) {
		opt('n')++;
		yysetfile(filename);
		opt('n')--;
	}
	yymain();
	/* No return */
}

pchr(c)
	char c;
{

	putc ( c , stdout );
}

char	ugh[]	= "Fatal error in pi\n";
/*
 * Exit from the Pascal system.
 * We throw in an ungraceful termination
 * message if c > 1 indicating a severe
 * error such as running out of memory
 * or an internal inconsistency.
 */
pexit(c)
	int c;
{

	if (opt('l') && c != DIED && c != NOSTART)
		while (getline() != -1)
			continue;
	yyflush();
	switch (c) {
		case DIED:
			write(2, ugh, sizeof ugh);
		case NOSTART:
		case ERRS:
#			ifdef OBJ
			    if (ofil > 0)
				    unlink(obj);
#			endif OBJ
#			ifdef PC
			    if ( pcstream != NULL ) {
				unlink( pcname );
			    }
#			endif PC
			break;
		case AOK:
#			ifdef OBJ
			    pflush();
#			endif OBJ
#			ifdef PC
			    puteof();
#			endif PC
			break;
	}
	/*
	 *	this to gather statistics on programs being compiled
	 *	taken 20 june 79 	... peter
	 *
	 *  if (fork() == 0) {
	 *  	char *cp = "-0";
	 *  	cp[1] += c;
	 *  	execl("/usr/lib/gather", "gather", cp, filename, 0);
	 *  	exit(1);
	 *  }
	 */
#	ifdef PTREE
	    pFinish();
#	endif
	exit(c);
}

onintr()
{

	signal( SIGINT , SIG_IGN );
	pexit(NOSTART);
}

/*
 * Get an error message from the error message file
 */
geterr(seekpt, buf)
	int seekpt;
	char *buf;
{

	lseek(efil, (long) seekpt, 0);
	if (read(efil, buf, 256) <= 0)
		perror(errfile), pexit(DIED);
}

header()
{
	extern char version[];
	static char anyheaders;

	gettime( filename );
	if (anyheaders && opt('n'))
		putc( '\f' , stdout );
	anyheaders++;
#	ifdef OBJ
	    printf("Berkeley Pascal PI -- Version 2.0 (%s)\n\n%s  %s\n\n",
		    version, myctime(&tvec), filename);
#	endif OBJ
#	ifdef PC
	    printf("Berkeley Pascal PC -- Version 2.0 (%s)\n\n%s  %s\n\n",
		    version, myctime(&tvec), filename);
#	endif PC
}