/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1984. */
static char rcsid[]="$Header: b2mai.c,v 1.1 84/06/28 00:49:17 timo Exp $";

/* B driver for interpreter */
#include "b.h"
#include <sys/types.h>

#include "b1obj.h"
#include "b1mem.h"
#include "b2env.h"
#include "b2scr.h"
#include "b2err.h"
#include "b2fil.h"
#include "b2sig.h"
#include "b2syn.h"
#include "b2sem.h"
#include "b2sou.h"

bool call_error, in_process;

main(argc, argv) int argc; string argv[]; {
	in_process= No; call_error= No;
	call(argc, argv);
	if (call_error) exit(-1);
	in_process= Yes;
	init();
	call(argc, argv);
	bye(0);
}

#define Cllerr stderr

string pname;	 /* program name */

Hidden Procedure erm(m, n, argc, pargc, pargv) string m, n; int argc, pargc; string pargv[]; {
	fprintf(Cllerr,
 "*** There is something I don't quite get in your call of %s\n", pname);
	show_call(argc, pargc, pargv);
	fprintf(Cllerr, "*** The problem is: %s %s\n", m, n);
	if (in_process) bye(-1);
	call_error= Yes;
}

Hidden Procedure call(pargc, pargv) int pargc; string pargv[]; {
	int argc; string *argv;

	pname = pargv[0];
	argc = pargc-1;
	argv = pargv+1;
	while (argc >= 0)
	if (argc > 0 && argv[0][0] == '-' && argv[0][1] != '\0') {
		if (argv[0][1] == 'q') { if (in_process) bye(0); }
		else if (argv[0][1] == 'i') {
			filtered= Yes;
			cmd_prompt= "\001>";
			eg_prompt=  "\001E";
			raw_prompt= "\001R";
			qn_prompt=  "\001Y";
		} else erm("I never learned about the option", argv[0], argc, pargc, pargv);
		argc -= 1;
		argv += 1;
	} else {
		if (argc == 0 || (argv[0][0] == '-' && argv[0][1] == '\0')) {
			release(iname);
			iname = Vnil;
			ifile = stdin;
		} else {
			release(iname);
			iname = mk_text(*argv);
			ifile = fopen(*argv, "r");
		}
		if (ifile != NULL) { if (in_process) process();
		} else erm("can't open input file", *argv, argc, pargc, pargv);
		if (ifile != NULL && ifile != stdin) fclose(ifile);
		++argv; --argc;
	}
}

Hidden Procedure show_call(eargc, pargc, pargv)
 int eargc, pargc; string pargv[]; {
	int argc= pargc; string *argv= pargv;
	intlet p, pos= 4;
	fprintf(Cllerr, "    ");
	while (argc > 0) {
		fprintf(Cllerr, *argv);
		pos+= strlen(*argv);
		if (argc == eargc) p= pos-1;
		++argv; --argc;
		if (argc > 0) {
			putc(' ', Cllerr);
			pos++;
		}
	}
	putc('\n', Cllerr);
	for (pos= 0; pos < p; pos++) putc(' ', Cllerr);
	fprintf(Cllerr, "^\n");
}

Hidden Procedure init() {
	initmem();
	initnum();
	initenv();
	inittors();
	initsou();
	initfprs();
	inithow();
	initscr();
	setprmnv();
	getprmnv();
	inisigs();
}

Visible Procedure process() {
	re_screen();
	alino= 0; Eof= Eof0= No;
	xeq= Yes; skipping= No; cntxt= In_command;
	if (setjmp(main_loop) != 0) /* long jump occurred */ {
		re_files();
		if (Eof) return;
		xeq= interactive; skipping= !interactive;
		/* skipping may be reset by command() */
	}
	inistreams();
	re_env();
	active_reads= 0;
	while (!Eof) {
		re_streams();
		cntxt= In_command; resexp= Voi; lino= 0;
		cur_ilev= 0;
		terminated= No;
		if (ilev(Yes) > 0) parerr("outer indentation not zero", "");
		findceol(); command();
		re_files();
	}
}