uemacs/main.c

/* main.c -- */

#define	CLRMSG	0  /* space clears the message line with no insert */

/*
 *	main.c
 *
 *	µEMACS 4.2
 *
 *	Based on:
 *
 *	uEmacs/PK 4.0
 *
 *	Based on:
 *
 *	MicroEMACS 3.9
 *	Written by Dave G. Conroy.
 *	Substantially modified by Daniel M. Lawrence
 *	Modified by Petri Kutvonen
 *
 *	MicroEMACS 3.9 (c) Copyright 1987 by Daniel M. Lawrence
 *
 *	Original statement of copying policy:
 *
 *	MicroEMACS 3.9 can be copied and distributed freely for any
 *	non-commercial purposes. MicroEMACS 3.9 can only be incorporated
 *	into commercial software with the permission of the current author.
 *
 *	No copyright claimed for modifications made by Petri Kutvonen.
 *
 *	This file contains the main driving routine, and some keyboard
 *	processing code.
 *
 * REVISION HISTORY:
 *
 * 1.0  Steve Wilhite, 30-Nov-85
 *
 * 2.0  George Jones, 12-Dec-85
 *
 * 3.0  Daniel Lawrence, 29-Dec-85
 *
 * 3.2-3.6 Daniel Lawrence, Feb...Apr-86
 *
 * 3.7	Daniel Lawrence, 14-May-86
 *
 * 3.8	Daniel Lawrence, 18-Jan-87
 *
 * 3.9	Daniel Lawrence, 16-Jul-87
 *
 * 3.9e	Daniel Lawrence, 16-Nov-87
 *
 * After that versions 3.X and Daniel Lawrence went their own ways.
 * A modified 3.9e/PK was heavily used at the University of Helsinki
 * for several years on different UNIX, VMS, and MSDOS platforms.
 *
 * This modified version is now called eEmacs/PK.
 *
 * 4.0	Petri Kutvonen, 1-Sep-91
 *
 * This modified version is now called uEMACS.
 *
 * 4.1	Renaud Fivet, 1-May-13
 *
 * Renamed as µEMACS to emphasize UTF-8 support.
 *
 * 4.2	Renaud Fivet, 2015-02-12
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "estruct.h"	/* Global structures and defines. */
#if UNIX
#include <signal.h>
#endif

#include "basic.h"
#include "bind.h"
#include "bindable.h"
#include "buffer.h"
#include "display.h"
#include "eval.h"
#include "execute.h"
#include "file.h"
#include "input.h"
#include "lock.h"
#include "mlout.h"
#include "random.h"
#include "search.h"
#include "terminal.h"
#include "termio.h"
#include "version.h"
#include "window.h"

/* For MSDOS, increase the default stack space. */
#if MSDOS & TURBO
#if PKCODE
extern unsigned _stklen = 20000;
#else
extern unsigned _stklen = 32766;
#endif
#endif

#if UNIX
static void emergencyexit(int signr)
{
	quickexit(FALSE, 0);
	quit(TRUE, 0);
}
#endif

static void edinit( char *bname) ;

static void version( void) {
    fputs( PROGRAM_NAME_PFX PROGRAM_NAME_LONG " version " VERSION "\n", stdout) ;
}


static void usage( void) {
    fputs( "Usage: " PROGRAM_NAME " [OPTION].. [FILE]..\n\n"
           "      +             start at the end of file\n"
           "      +<n>          start at line <n>\n"
           "      --help        display this help and exit\n"
           "      --version     output version information and exit\n"
           "      @cmdfile      execute command file\n"
           "      -a|A          process error file\n"
           "      -e|E          edit file\n"
           "      -g|G<n>       go to line <n>\n"
#if CRYPT
           "      -k|K<key>     use code key\n"
#endif
           "      -r|R          restrictive use\n"
           "      -s|S<string>  search string\n"
           "      -v|V          view file\n"
           , stdout) ;
}


int main(int argc, char **argv)
{
	int c = -1;	/* command character */
	int f;		/* default flag */
	int n;		/* numeric repeat count */
	int mflag;	/* negative flag on repeat */
	struct buffer *bp;	/* temp buffer pointer */
	int firstfile;	/* first file flag */
	int carg;	/* current arg to scan */
	int startflag;	/* startup executed flag */
	struct buffer *firstbp = NULL;	/* ptr to first buffer in cmd line */
	int basec;		/* c stripped of meta character */
	int viewflag;		/* are we starting in view mode? */
	int gotoflag;		/* do we need to goto a line at start? */
	int gline = 0;		/* if so, what line? */
	int searchflag;		/* Do we need to search at start? */
	int saveflag;		/* temp store for lastflag */
	int errflag;		/* C error processing? */
	bname_t bname ;	/* buffer name of file to read */
#if	CRYPT
	int cryptflag;		/* encrypting on the way in? */
	ekey_t	ekey ;	/* startup encryption key */
#endif
	int newc;

#if	PKCODE & VMS
	(void) umask(-1); /* Use old protection (this is at wrong place). */
#endif

#if	PKCODE & BSD
	sleep(1); /* Time for window manager. */
#endif

#if	UNIX
#ifdef SIGWINCH
	signal(SIGWINCH, sizesignal);
#endif
#endif
	if( argc == 2) {
		if( strcmp( argv[ 1], "--help") == 0) {
			usage() ;
			exit( EXIT_SUCCESS) ;
		}

		if( strcmp( argv[ 1], "--version") == 0) {
			version() ;
			exit( EXIT_SUCCESS) ;
		}
	}

	/* Initialize the editor. */
	vtinit();		/* Display */
	mloutfmt = mlwrite ;
	edinit("main");		/* Buffers, windows */
	varinit();		/* user variables */

	viewflag = FALSE;	/* view mode defaults off in command line */
	gotoflag = FALSE;	/* set to off to begin with */
	searchflag = FALSE;	/* set to off to begin with */
	firstfile = TRUE;	/* no file to edit yet */
	startflag = FALSE;	/* startup file not executed yet */
	errflag = FALSE;	/* not doing C error parsing */
#if	CRYPT
	cryptflag = FALSE;	/* no encryption by default */
#endif

	/* Insure screen is initialized before startup and goto/search */
	update( FALSE) ;

	/* Parse the command line */
	for (carg = 1; carg < argc; ++carg) {
		/* Process Switches */
#if	PKCODE
		if (argv[carg][0] == '+') {
			gotoflag = TRUE;
			gline = atoi(&argv[carg][1]);
		} else
#endif
		if (argv[carg][0] == '-') {
			switch (argv[carg][1]) {
				/* Process Startup macroes */
			case 'a':	/* process error file */
			case 'A':
				errflag = TRUE;
				break;
			case 'e':	/* -e for Edit file */
			case 'E':
				viewflag = FALSE;
				break;
			case 'g':	/* -g for initial goto */
			case 'G':
				gotoflag = TRUE;
				gline = atoi(&argv[carg][2]);
				break;
#if	CRYPT
			case 'k':	/* -k<key> for code key */
			case 'K':
				cryptflag = TRUE;
				strncpy( ekey, &argv[ carg][ 2], sizeof ekey - 1) ;
				ekey[ sizeof ekey - 1] = 0 ;
				break;
#endif
			case 'r':	/* -r restrictive use */
			case 'R':
				restflag = TRUE;
				break;
			case 's':	/* -s for initial search string */
			case 'S':
				searchflag = TRUE;
				strncpy( pat, &argv[ carg][ 2], sizeof pat - 1) ;
				pat[ sizeof pat -1] = 0 ;
				break;
			case 'v':	/* -v for View File */
			case 'V':
				viewflag = TRUE;
				break;
			default:	/* unknown switch */
				/* ignore this for now */
				break;
			}

		} else if (argv[carg][0] == '@') {

			/* Process Startup macroes */
			if (startup(&argv[carg][1]) == TRUE)
				/* don't execute emacs.rc */
				startflag = TRUE;

		} else {

			/* Process an input file */

			/* set up a buffer for this file */
			makename(bname, argv[carg]);
			unqname(bname);

			/* set this to inactive */
			bp = bfind( bname, TRUE, 0) ;
			if( bp == NULL) {
				fputs( "Buffer creation failed!\n", stderr) ;
				exit( EXIT_FAILURE) ;
			}

			strncpy( bp->b_fname, argv[ carg], sizeof bp->b_fname - 1) ; /* max filename length limited to NFILEN - 1 (79) */
			bp->b_fname[ sizeof bp->b_fname - 1] = 0 ;
			bp->b_active = FALSE;
			if (firstfile) {
				firstbp = bp;
				firstfile = FALSE;
			}

			/* set the modes appropriatly */
			if (viewflag)
				bp->b_mode |= MDVIEW;
#if	CRYPT
			if (cryptflag) {
				bp->b_mode |= MDCRYPT;
				strncpy( bp->b_key, ekey, sizeof ekey) ;
				cryptbufferkey( bp) ;
			}
#endif
		}
	}

#if	UNIX
#ifdef SIGHUP
	signal(SIGHUP, emergencyexit);
#endif
	signal(SIGTERM, emergencyexit);
#endif

	/* if we are C error parsing... run it! */
	if (errflag) {
		if (startup("error.cmd") == TRUE)
			startflag = TRUE;
	}

	/* if invoked with no other startup files,
	   run the system startup file here */
	if (startflag == FALSE) {
		startup("");
		startflag = TRUE;
	}
	discmd = TRUE;		/* P.K. */

	/* if there are any files to read, read the first one! */
	bp = bfind("main", FALSE, 0);
	if( bp == NULL) {
	/* "main" buffer has been created during early initialisation */
		fputs( "Initialisation failure!\n", stderr) ;
		exit( EXIT_FAILURE) ;
	}

	if (firstfile == FALSE && readfirst_f()) {
		swbuffer(firstbp);
		zotbuf(bp);
	} else {
		bp->b_mode |= gmode;
		upmode() ;
	}

	/* Deal with startup gotos and searches */
	if( gotoflag && searchflag)
		mloutstr( "(Can not search and goto at the same time!)") ;
	else if( gotoflag) {
		if( gotoline( TRUE, gline) == FALSE)
			mloutstr( "(Bogus goto argument)") ;
	} else if( searchflag)
		if( forwhunt( FALSE, 0))
			mloutfmt( "Found on line %d", getcline()) ;

	/* Setup to process commands. */
	lastflag = 0;  /* Fake last flags. */

      loop:
	/* Execute the "command" macro...normally null. */
	saveflag = lastflag;  /* Preserve lastflag through this. */
	execute(META | SPEC | 'C', FALSE, 1);
	lastflag = saveflag;

#if TYPEAH && PKCODE
	if (typahead()) {
		newc = getcmd();
		update(FALSE);
		do {
			fn_t execfunc;

			if (c == newc && (execfunc = getbind(c)) != NULL
			    && execfunc != insert_newline
			    && execfunc != insert_tab)
				newc = getcmd();
			else
				break;
		} while (typahead());
		c = newc;
	} else {
		update(FALSE);
		c = getcmd();
	}
#else
	/* Fix up the screen    */
	update(FALSE);

	/* get the next command from the keyboard */
	c = getcmd();
#endif
	/* if there is something on the command line, clear it */
	if (mpresf != FALSE) {
		mloutstr( "") ;
		update(FALSE);
#if	CLRMSG
		if (c == ' ')	/* ITS EMACS does this  */
			goto loop;
#endif
	}
	f = FALSE;
	n = 1;

	/* do META-# processing if needed */

	basec = c & ~META;	/* strip meta char off if there */
	if ((c & META) && ((basec >= '0' && basec <= '9') || basec == '-')) {
		f = TRUE;	/* there is a # arg */
		n = 0;		/* start with a zero default */
		mflag = 1;	/* current minus flag */
		c = basec;	/* strip the META */
		while ((c >= '0' && c <= '9') || (c == '-')) {
			if (c == '-') {
				/* already hit a minus or digit? */
				if ((mflag == -1) || (n != 0))
					break;
				mflag = -1;
			} else {
				n = n * 10 + (c - '0');
			}
			if ((n == 0) && (mflag == -1))	/* lonely - */
				mloutstr( "Arg:") ;
			else
				mloutfmt( "Arg: %d", n * mflag) ;

			c = getcmd();	/* get the next key */
		}
		n = n * mflag;	/* figure in the sign */
	}

	/* do ^U repeat argument processing */

	if (c == reptc) {	/* ^U, start argument   */
		f = TRUE;
		n = 4;		/* with argument of 4 */
		mflag = 0;	/* that can be discarded. */
		mloutstr( "Arg: 4") ;
		while (((c = getcmd()) >= '0' && c <= '9') || c == reptc
		       || c == '-') {
			if (c == reptc)
				if ((n > 0) == ((n * 4) > 0))
					n = n * 4;
				else
					n = 1;
			/*
			 * If dash, and start of argument string, set arg.
			 * to -1.  Otherwise, insert it.
			 */
			else if (c == '-') {
				if (mflag)
					break;
				n = 0;
				mflag = -1;
			}
			/*
			 * If first digit entered, replace previous argument
			 * with digit and set sign.  Otherwise, append to arg.
			 */
			else {
				if (!mflag) {
					n = 0;
					mflag = 1;
				}
				n = 10 * n + c - '0';
			}
			mloutfmt( "Arg: %d", (mflag >= 0) ? n : (n ? -n : -1)) ;
		}
		/*
		 * Make arguments preceded by a minus sign negative and change
		 * the special argument "^U -" to an effective "^U -1".
		 */
		if (mflag == -1) {
			if (n == 0)
				n++;
			n = -n;
		}
	}

	/* and execute the command */
	execute(c, f, n);
	goto loop;
}

/*
 * Initialize all of the buffers and windows. The buffer name is passed down
 * as an argument, because the main routine may have been told to read in a
 * file by default, and we want the buffer name to be right.
 */
static void edinit(char *bname)
{
	struct buffer *bp;
	struct window *wp;

	bp = bfind(bname, TRUE, 0);	/* First buffer         */
	blistp = bfind("*List*", TRUE, BFINVS);	/* Buffer list buffer   */
	wp = (struct window *)malloc(sizeof(struct window));	/* First window         */
	if (bp == NULL || wp == NULL || blistp == NULL) {
		fputs( "First initialisation failed!\n", stderr) ;
		exit( EXIT_FAILURE) ;
	}

	curbp = bp;		/* Make this current    */
	wheadp = wp;
	curwp = wp;
	wp->w_wndp = NULL;	/* Initialize window    */
	wp->w_bufp = bp;
	bp->b_nwnd = 1;		/* Displayed.           */
	wp->w_linep = bp->b_linep;
	wp->w_dotp = bp->b_linep;
	wp->w_doto = 0;
	wp->w_markp = NULL;
	wp->w_marko = 0;
	wp->w_toprow = 0;
#if	COLOR
	/* initalize colors to global defaults */
	wp->w_fcolor = gfcolor;
	wp->w_bcolor = gbcolor;
#endif
	wp->w_ntrows = term.t_nrow - 1;	/* "-1" for mode line.  */
	wp->w_force = 0;
	wp->w_flag = WFMODE | WFHARD;	/* Full.                */
}

/*****		Compiler specific Library functions	****/

#if	RAMSIZE
/*	These routines will allow me to track memory usage by placing
	a layer on top of the standard system malloc() and free() calls.
	with this code defined, the environment variable, $RAM, will
	report on the number of bytes allocated via malloc.

	with SHOWRAM defined, the number is also posted on the
	end of the bottom mode line and is updated whenever it is changed.
*/

static void dspram( void) ;

#undef	malloc
#undef	free
#if 0
char *allocate(nbytes)
			    /* allocate nbytes and track */
unsigned nbytes;		/* # of bytes to allocate */
#endif
void *allocate( size_t nbytes)
{
	char *mp;		/* ptr returned from malloc */
/*	char *malloc(); */

	mp = malloc(nbytes);
	if (mp) {
		envram += nbytes;
#if	RAMSHOW
		dspram();
#endif
	}

	return mp;
}

#if 0
release(mp)
    /* release malloced memory and track */
char *mp;			/* chunk of RAM to release */
#endif
void release( void *mp)
{
	unsigned *lp;		/* ptr to the long containing the block size */

	if (mp) {
		/* update amount of ram currently malloced */
		lp = ((unsigned *) mp) - 1;
		envram -= (long) *lp - 2;
		free(mp);
#if	RAMSHOW
		dspram();
#endif
	}
}

#if	RAMSHOW
static void dspram( void)
{				/* display the amount of RAM currently malloced */
	char mbuf[20];
	char *sp;

	TTmove(term.t_nrow - 1, 70);
#if	COLOR
	TTforg(7);
	TTbacg(0);
#endif
	sprintf(mbuf, "[%lu]", envram);
	sp = &mbuf[0];
	while (*sp)
		TTputc(*sp++);
	TTmove(term.t_nrow, 0);
	movecursor(term.t_nrow, 0);
}
#endif
#endif

/*	On some primitave operation systems, and when emacs is used as
	a subprogram to a larger project, emacs needs to de-alloc its
	own used memory
*/

#if	CLEAN

/*
 * cexit()
 *
 * int status;		return status of emacs
 */
void cexit( int status) {
	struct buffer *bp;	/* buffer list pointer */
	struct window *wp;	/* window list pointer */
	struct window *tp;	/* temporary window pointer */

	/* first clean up the windows */
	wp = wheadp;
	while (wp) {
		tp = wp->w_wndp;
		free(wp);
		wp = tp;
	}
	wheadp = NULL;

	/* then the buffers */
	bp = bheadp;
	while (bp) {
		bp->b_nwnd = 0;
		bp->b_flag = 0;	/* don't say anything about a changed buffer! */
		zotbuf(bp);
		bp = bheadp;
	}

	/* and the kill buffer */
	kdelete();

	/* and the video buffers */
	vtfree();

#undef	exit
	exit(status);
}
#endif