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    Length: 5907 (0x1713)
    Types: TextFile
    Names: »te_main.c«

└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
    └─ ⟦this⟧ »EUUGD11/euug-87hel/sec1/teco/te_main.c« 

TextFile

/* TECO for Ultrix   Copyright 1986 Matt Fichtenbaum						*/
/* This program and its components belong to GenRad Inc, Concord MA 01742	*/
/* They may be copied if this copyright notice is included					*/

/* te_main.c  main program  1/14/87 */

/*
* This is TECO for Ultrix on a Vax.  It is mostly compatible with DEC TECO
* as explained in the DEC TECO manual.  It was written from a manual for
* TECO-11 version 34, and so adheres most closely to that version.
*
* This program consists of several source files, as follows:
*
* te_main.c (this file)		Main program - initialize, read command line and
*							startup file, handle errors, high-level read and
*							execute command strings.
*
* te_defs.h					Definitions file, to be #included with other files
*
* te_data.c					Global variables
*
* te_rdcmd.c				Read in a command string
*
* te_exec0.c				First-level command execution - numbers, values,
*							assemble expressions
*
* te_exec1.c				Most commands
*
* te_exec2.c				"E" and "F" commands, and file I/O
*
* te_srch.c					routines associated with "search" commands
*
* te_subs.c					higher-level subroutines
*
* te_utils.c				lower-level subroutines
*
* te_chario.c				keyboard (stdin), typeout (stdout), suspend
*
* te_window.c				display window and display special functions
*
* These routines should be compiled and linked to form the TECO executable.
*/
\f


#include "te_defs.h"

main(argc, argv)
	int argc;			/* arg count */
	char *argv[];		/* array of string pointers */
	{
	int i;

	save_args(argc, argv, &qreg[36]);	/* copy command line to Qz */
	read_startup();						/* read startup file */
	setup_tty(TTY_ON);		/* set tty to CBREAK, no echo, asynch mode */
	window(WIN_INIT);		/* initialize screen-image buffer */
	get_term_par();			/* set terminal screen-size parameters */

/* set up error restart */
	if (err = setjmp(xxx))
		{
		if (err == E_EFI) goto quit;		/* EOF from standard input - clean up and exit */
		printf("\015\012?  %s", errors[err-1]);
		if (err == E_SRH) print_string(SERBUF);			/* print unfulfilled search string */
		else if ((err == E_FNF) || (err == E_COF) || (err == E_AMB)) print_string(FILBUF);	/* or file string */
		crlf();
		eisw = 0;				/* stop indirect command execution */
		et_val &= ~(ET_CTRLC | ET_NOWAIT | ET_CTRLO | ET_NOECHO);	/* reset ^C trap, read w/o wait, ^O (unused), no echo */
		if (et_val & ET_QUIT)	/* if ET has "quit on error" set, exit (phone home) */
			{
			cleanup();			/* reset screen, keyboard, output files */
			exit(1);			/* and exit */
			}
		}

/* forever: read and execute command strings */

	for (exitflag = 1; exitflag >= 0; )		/* "exit" sets exitflag to -1; ^C to -2; "hangup" to -3 */
		{
		window(WIN_REFR);				/* display the buffer */
		free_blist(insert_p);			/* free any storage from failed insert */
		free_blist(dly_freebuff);		/* return any delayed cells */
		insert_p = dly_freebuff = NULL;
		et_val &= ~ET_QUIT;				/* clear "abort on error" */
		if (read_cmdstr()) goto quit;
		exitflag = 0;					/* enable ^C detector */
		if (!WN_scroll) window(WIN_REDRAW);		/* if not in scroll mode, force full redraw on first ^W or nW */
		exec_cmdstr();
		}

	if (exitflag == -2) ERROR(E_XAB);		/* ^C detected during execution */
	else if (exitflag == -3) panic();		/* hangup during execution: save buffer and close files */

/* exit from program */

  quit:
	ev_val = es_val = 0;	/* no last one-line window */
	window(WIN_REFR);		/* last display */
	cleanup();				/* reset screen, terminal, output files */
	exit(0);				/* and quit */
	}
\f

/* reset screen state, keyboard state; remove open output files */

cleanup()
	{
	window(WIN_OFF);			/* restore screen */
	setup_tty(TTY_OFF);			/* restore terminal */
	kill_output(&po_file);		/* kill any open primary output file */
	kill_output(&so_file);		/* and secondary file */
	}


/* print string for error message */
/* argument is subscript of a qreg qh, prints text from that buffer */

print_string(arg)
	int arg;
	{
	int i, c;
	struct buffcell *p;

	type_char('"');
	for (p = qreg[arg].f, c = 0, i = 0; i < qreg[arg].z; i++)
		{
		if (!p->ch[c]) break;
		type_char(p->ch[c]);
		if (++c > CELLSIZE-1)
			{
			p = p->f;
			c = 0;
			}
		}
	type_char('"');
	}
\f

/* copy invocation command line to a text buffer */

save_args(argc, argv, q)
	int argc;
	char *argv[];
	struct qh *q;
	{
	char c;
	struct qp ptr;

	make_buffer(q);				/* attach a text buffer */
	ptr.p = q->f;				/* initialize pointer to output string */
	ptr.c = q->z = 0;			/* and output char count */
	for (; argc > 0; argv++, argc--)	/* for each arg */
		{
		while ( ((c = *((*argv)++)) != '\0') && (q->z < CELLSIZE-1) )
			{
			ptr.p->ch[ptr.c] = c;		/* copy char to q-reg */
			fwdcx(&ptr);
			++q->z;						/* count characters */
			}
		if (argc > 1)					/* if not last argument... */
			{
			ptr.p->ch[ptr.c] = ' ';		/* space to separate arguments */
			fwdcx(&ptr);
			}
		}
	}



/* routine to read startup file */

char startup_name[] = "/.tecorc";		/* name of startup file */

read_startup()
	{
	char *hp, *getenv();
	char fn[CELLSIZE];		/* filename storage */
	int i;

/* look for ".tecorc" in current directory first */

	if (!(eisw = fopen(&startup_name[1], "r")))
		{
		if (hp = getenv("HOME"))	/* if not found, look in home directory */
			{
			for (i = 0; i < CELLSIZE; i++) if (!(fn[i] = *(hp++))) break;	/* copy until trailing null */
			for (hp = &startup_name[0]; i < CELLSIZE; i++) if (!(fn[i] = *(hp++))) break;
			eisw = fopen(fn, "r");		/* set eisw if file found, or not if not */
			}
		}
	}
\f

/* routine to get terminal height and width from termcap */

get_term_par()
	{
	char buff[1024];	/* termcap buffer */
	char *pname;		/* pointer to name of terminal */
	extern char *getenv();

	if (pname = getenv("TERM"))		/* read terminal name */
		{
		tgetent(buff, pname);		/* get entry */
		set_term_par(tgetnum("li"), tgetnum("co"));	/* get #lines and #columns and set params */
		}
	}