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/*

 * This code contains changes by

 *      Gunnar Ritter, Freiburg i. Br., Germany, 2002. All rights reserved.

 *

 * Conditions 1, 2, and 4 and the no-warranty notice below apply

 * to these changes.

 *

 *

 * Copyright (c) 1980, 1993

 * 	The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 * 	This product includes software developed by the University of

 * 	California, Berkeley and its contributors.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *

 * Copyright(C) Caldera International Inc. 2001-2002. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *   Redistributions of source code and documentation must retain the

 *    above copyright notice, this list of conditions and the following

 *    disclaimer.

 *   Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *   All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed or owned by Caldera

 *      International, Inc.

 *   Neither the name of Caldera International, Inc. nor the names of

 *    other contributors may be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA

 * INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE

 * LIABLE FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR

 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE

 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,

 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#ifndef	lint

#ifdef	DOSCCS

static char sccsid[] = "@(#)ex_vmain.c	1.29 (gritter) 2/17/05";

#endif

#endif

/* from ex_vmain.c	7.7 (Berkeley) 6/7/85 */

#include "ex.h"

#include "ex_tty.h"

#include "ex_vis.h"

/*

 * This is the main routine for visual.

 * We here decode the count and possible named buffer specification

 * preceding a command and interpret a few of the commands.

 * Commands which involve a target (i.e. an operator) are decoded

 * in the routine operate in ex_voperate.c.

 */

#define	forbid(a)	{ if (a) goto fonfon; }

void 

vmain(void)

{

	int c, cnt, i;

	cell esave[TUBECOLS];

	char *oglobp;

	short d;

	line *addr;

	int ind, nlput;

	int shouldpo = 0;

	int onumber = 0, olist = 0;

	void (*OPline)(int) = NULL;

	int (*OPutchar)(int) = NULL;

	CLOBBGRD(c);

	CLOBBGRD(cnt);

	CLOBBGRD(i);

	CLOBBGRD(oglobp);

	CLOBBGRD(addr);

	CLOBBGRD(shouldpo);

	CLOBBGRD(onumber);

	CLOBBGRD(olist);

	CLOBBGRD(OPline);

	CLOBBGRD(OPutchar);

	vch_mac = VC_NOTINMAC;

	/*

	 * If we started as a vi command (on the command line)

	 * then go process initial commands (recover, next or tag).

	 */

	if (initev) {

		oglobp = globp;

		globp = initev;

		hadcnt = cnt = 0;

		i = tchng;

		addr = dot;

		goto doinit;

	}

	/*

	 * NB:

	 *

	 * The current line is always in the line buffer linebuf,

	 * and the cursor at the position cursor.  You should do

	 * a vsave() before moving off the line to make sure the disk

	 * copy is updated if it has changed, and a getDOT() to get

	 * the line back if you mung linebuf.  The motion

	 * routines in ex_vwind.c handle most of this.

	 */

	for (;;) {

		/*

		 * Decode a visual command.

		 * First sync the temp file if there has been a reasonable

		 * amount of change.  Clear state for decoding of next

		 * command.

		 */

		TSYNC();

		vglobp = 0;

		vreg = 0;

		hold = 0;

		seenprompt = 1;

		wcursor = 0;

		Xhadcnt = hadcnt = 0;

		Xcnt = cnt = 1;

		splitw = 0;

		if (i = holdupd) {

			if (state == VISUAL)

				ignore(peekkey());

			holdupd = 0;

/*

			if (LINE(0) < ZERO) {

				vclear();

				vcnt = 0;

				i = 3;

			}

*/

			if (state != VISUAL) {

				vcnt = 0;

				vsave();

				vrepaint(cursor);

			} else if (i == 3)

				vredraw(WTOP);

			else

				vsync(WTOP);

			vfixcurs();

		}

		/*

		 * Gobble up counts and named buffer specifications.

		 */

		for (;;) {

looptop:

#ifdef MDEBUG

			if (trace)

				fprintf(trace, "pc=%c",peekkey());

#endif

			if (xisdigit(peekkey()) && peekkey() != '0') {

				hadcnt = 1;

				cnt = vgetcnt();

				forbid (cnt <= 0);

			}

			if (peekkey() != '"')

				break;

			ignore(getkey()), c = getkey();

			/*

			 * Buffer names be letters or digits.

			 * But not '0' as that is the source of

			 * an 'empty' named buffer spec in the routine

			 * kshift (see ex_temp.c).

			 */

			forbid (c == '0' || !xisalpha(c) && !xisdigit(c));

			vreg = c;

		}

reread:

		/*

		 * Come to reread from below after some macro expansions.

		 * The call to map allows use of function key pads

		 * by performing a terminal dependent mapping of inputs.

		 */

#ifdef MDEBUG

		if (trace)

			fprintf(trace,"pcb=%c,",peekkey());

#endif

		op = getkey();

		maphopcnt = 0;

		do {

			/*

			 * Keep mapping the char as long as it changes.

			 * This allows for double mappings, e.g., q to #,

			 * #1 to something else.

			 */

			c = op;

			op = map(c,arrows);

#ifdef MDEBUG

			if (trace)

				fprintf(trace,"pca=%c,",c);

#endif

			/*

			 * Maybe the mapped to char is a count. If so, we have

			 * to go back to the "for" to interpret it. Likewise

			 * for a buffer name.

			 */

			if ((xisdigit(c) && c!='0') || c == '"') {

				ungetkey(c);

				goto looptop;

			}

			if (!value(REMAP)) {

				c = op;

				break;

			}

			if (++maphopcnt > 256)

				error(catgets(catd, 1, 225,

						"Infinite macro loop"));

		} while (c != op);

		/*

		 * Begin to build an image of this command for possible

		 * later repeat in the buffer workcmd.  It will be copied

		 * to lastcmd by the routine setLAST

		 * if/when completely specified.

		 */

		lastcp = workcmd;

		if (!vglobp)

			*lastcp++ = c;

		/*

		 * First level command decode.

		 */

		if (c == ATTN)

			goto case_ATTN;

		switch (c) {

		/*

		 * ^L		Clear screen e.g. after transmission error.

		 */

		/*

		 * ^R		Retype screen, getting rid of @ lines.

		 *		If in open, equivalent to ^L.

		 *		On terminals where the right arrow key sends

		 *		^L we make ^R act like ^L, since there is no

		 *		way to get ^L.  These terminals (adm31, tvi)

		 *		are intelligent so ^R is useless.  Soroc

		 *		will probably foul this up, but nobody has

		 *		one of them.

		 */

		case CTRL('l'):

		case CTRL('r'):

			if (c == CTRL('l') || (KR && *KR==CTRL('l'))) {

				vclear();

				vdirty(0, vcnt);

			}

			if (state != VISUAL) {

				/*

				 * Get a clean line, throw away the

				 * memory of what is displayed now,

				 * and move back onto the current line.

				 */

				vclean();

				vcnt = 0;

				vmoveto(dot, cursor, 0);

				continue;

			}

			vredraw(WTOP);

			/*

			 * Weird glitch -- when we enter visual

			 * in a very small window we may end up with

			 * no lines on the screen because the line

			 * at the top is too long.  This forces the screen

			 * to be expanded to make room for it (after

			 * we have printed @'s ick showing we goofed).

			 */

			if (vcnt == 0)

				vrepaint(cursor);

			vfixcurs();

			continue;

		/*

		 * $		Escape just cancels the current command

		 *		with a little feedback.

		 */

		case ESCAPE:

			beep();

			continue;

		/*

		 * @   		Macros. Bring in the macro and put it

		 *		in vmacbuf, point vglobp there and punt.

		 */

		 case '@':

			c = getesc();

			if (c == 0)

				continue;

			if (c == '@')

				c = lastmac;

			if (xisupper(c))

				c = xtolower(c);

			forbid(!xislower(c));

			lastmac = c;

			vsave();

			CATCH

				char tmpbuf[BUFSIZ];

				regbuf(c,tmpbuf,sizeof(vmacbuf));

				macpush(tmpbuf, 1);

			ONERR

				lastmac = 0;

				splitw = 0;

				getDOT();

				vrepaint(cursor);

				continue;

			ENDCATCH

			vmacp = vmacbuf;

			goto reread;

		/*

		 * .		Repeat the last (modifying) open/visual command.

		 */

		case '.':

			/*

			 * Check that there was a last command, and

			 * take its count and named buffer unless they

			 * were given anew.  Special case if last command

			 * referenced a numeric named buffer -- increment

			 * the number and go to a named buffer again.

			 * This allows a sequence like "1pu.u.u...

			 * to successively look for stuff in the kill chain

			 * much as one does in EMACS with C-Y and M-Y.

			 */

			forbid (lastcmd[0] == 0);

			if (hadcnt)

				lastcnt = cnt;

			if (vreg)

				lastreg = vreg;

			else if (xisdigit(lastreg) && lastreg < '9')

				lastreg++;

			vreg = lastreg;

			cnt = lastcnt;

			hadcnt = lasthad;

			vglobp = lastcmd;

			goto reread;

		/*

		 * ^U		Scroll up.  A count sticks around for

		 *		future scrolls as the scroll amount.

		 *		Attempt to hold the indentation from the

		 *		top of the screen (in logical lines).

		 *

		 * BUG:		A ^U near the bottom of the screen

		 *		on a dumb terminal (which can't roll back)

		 *		causes the screen to be cleared and then

		 *		redrawn almost as it was.  In this case

		 *		one should simply move the cursor.

		 */

		case CTRL('u'):

			if (hadcnt)

				vSCROLL = cnt;

			cnt = vSCROLL;

			if (state == VISUAL)

				ind = vcline, cnt += ind;

			else

				ind = 0;

			vmoving = 0;

			vup(cnt, ind, 1);

			vnline(NOSTR);

			continue;

		/*

		 * ^D		Scroll down.  Like scroll up.

		 */

		case CTRL('d'):

#ifdef TRACE

		if (trace)

			fprintf(trace, "before vdown in ^D, dot=%d, wdot=%d, dol=%d\n", lineno(dot), lineno(wdot), lineno(dol));

#endif

			if (hadcnt)

				vSCROLL = cnt;

			cnt = vSCROLL;

			if (state == VISUAL)

				ind = vcnt - vcline - 1, cnt += ind;

			else

				ind = 0;

			vmoving = 0;

			vdown(cnt, ind, 1);

#ifdef TRACE

		if (trace)

			fprintf(trace, "before vnline in ^D, dot=%d, wdot=%d, dol=%d\n", lineno(dot), lineno(wdot), lineno(dol));

#endif

			vnline(NOSTR);

#ifdef TRACE

		if (trace)

			fprintf(trace, "after vnline in ^D, dot=%d, wdot=%d, dol=%d\n", lineno(dot), lineno(wdot), lineno(dol));

#endif

			continue;

		/*

		 * ^E		Glitch the screen down (one) line.

		 *		Cursor left on same line in file.

		 */

		case CTRL('e'):

			if (state != VISUAL)

				continue;

			if (!hadcnt)

				cnt = 1;

			/* Bottom line of file already on screen */

			forbid(lineDOL()-lineDOT() <= vcnt-1-vcline);

			ind = vcnt - vcline - 1 + cnt;

			vdown(ind, ind, 1);

			vnline(cursor);

			continue;

		/*

		 * ^Y		Like ^E but up

		 */

		case CTRL('y'):

			if (state != VISUAL)

				continue;

			if (!hadcnt)

				cnt = 1;

			forbid(lineDOT()-1<=vcline); /* line 1 already there */

			ind = vcline + cnt;

			vup(ind, ind, 1);

			vnline(cursor);

			continue;

		/*

		 * m		Mark position in mark register given

		 *		by following letter.  Return is

		 *		accomplished via ' or `; former

		 *		to beginning of line where mark

		 *		was set, latter to column where marked.

		 */

		case 'm':

			/*

			 * Getesc is generally used when a character

			 * is read as a latter part of a command

			 * to allow one to hit rubout/escape to cancel

			 * what you have typed so far.  These characters

			 * are mapped to 0 by the subroutine.

			 */

			c = getesc();

			if (c == 0)

				continue;

			/*

			 * Markreg checks that argument is a letter

			 * and also maps ' and ` to the end of the range

			 * to allow '' or `` to reference the previous

			 * context mark.

			 */

			c = markreg(c);

			forbid (c == 0);

			vsave();

			names[c - 'a'] = (*dot &~ 01);

			ncols[c - 'a'] = cursor;

			anymarks = 1;

			continue;

		/*

		 * ^F		Window forwards, with 2 lines of continuity.

		 *		Count repeats.

		 */

		case CTRL('f'):

			vsave();

			if (vcnt > 2) {

				addr = dot + (vcnt - vcline) - 2 + (cnt-1)*basWLINES;

				forbid(addr > dol);

				dot = (line*)addr;

				vcnt = vcline = 0;

			}

			vzop(0, 0, '+');

			continue;

		/*

		 * ^B		Window backwards, with 2 lines of continuity.

		 *		Inverse of ^F.

		 */

		case CTRL('b'):

			vsave();

			if (one + vcline != dot && vcnt > 2) {

				addr = dot - vcline + 2 - (cnt-1)*basWLINES;

				forbid (addr <= zero);

				dot = (line*)addr;

				vcnt = vcline = 0;

			}

			vzop(0, 0, '^');

			continue;

		/*

		 * z		Screen adjustment, taking a following character:

		 *			z<CR>		current line to top

		 *			z<NL>		like z<CR>

		 *			z-		current line to bottom

		 *		also z+, z^ like ^F and ^B.

		 *		A preceding count is line to use rather

		 *		than current line.  A count between z and

		 *		specifier character changes the screen size

		 *		for the redraw.

		 *

		 */

		case 'z':

			if (state == VISUAL) {

				i = vgetcnt();

				if (i > 0)

					vsetsiz(i);

				c = getesc();

				if (c == 0)

					continue;

			}

			vsave();

			vzop(hadcnt, cnt, c);

			continue;

		/*

		 * Y		Yank lines, abbreviation for y_ or yy.

		 *		Yanked lines can be put later if no

		 *		changes intervene, or can be put in named

		 *		buffers and put anytime in this session.

		 */

		case 'Y':

			ungetkey('_');

			c = 'y';

			break;

		/*

		 * J		Join lines, 2 by default.  Count is number

		 *		of lines to join (no join operator sorry.)

		 */

		case 'J':

			forbid (dot == dol);

			if (cnt == 1)

				cnt = 2;

			if (cnt > (i = dol - dot + 1))

				cnt = i;

			vsave();

			vmacchng(1);

			setLAST();

			cursor = strend(linebuf);

			vremote(cnt, join, 0);

			notenam = "join";

			vmoving = 0;

			killU();

			vreplace(vcline, cnt, 1);

			if (!*cursor && cursor > linebuf)

				cursor += skipleft(linebuf, cursor);

			if (notecnt == 2)

				notecnt = 0;

			vrepaint(cursor);

			continue;

		/*

		 * S		Substitute text for whole lines, abbrev for c_.

		 *		Count is number of lines to change.

		 */

		case 'S':

			ungetkey('_');

			c = 'c';

			break;

		/*

		 * O		Create a new line above current and accept new

		 *		input text, to an escape, there.

		 *		A count specifies, for dumb terminals when

		 *		slowopen is not set, the number of physical

		 *		line space to open on the screen.

		 *

		 * o		Like O, but opens lines below.

		 */

		case 'O':

		case 'o':

			vmacchng(1);

			voOpen(c, cnt);

			continue;

		/*

		 * C		Change text to end of line, short for c$.

		 */

		case 'C':

			if (*cursor) {

				ungetkey('$'), c = 'c';

				break;

			}

			goto appnd;

		/*

		 * ~	Switch case of letter under cursor

		 */

		case '~':

			vswitch(cnt);

			continue;

		/*

		 * A		Append at end of line, short for $a.

		 */

		case 'A':

			operate('$', 1);

appnd:

			c = 'a';

			/* fall into ... */

		/*

		 * a		Appends text after cursor.  Text can continue

		 *		through arbitrary number of lines.

		 */

		case 'a':

			if (*cursor) {

				if (state == HARDOPEN) {

					int	c, n;

					nextc(c, cursor, n);

					putchar(c);

					cursor += n;

				} else

					cursor += skipright(linebuf, cursor);

			}

			goto insrt;

		/*

		 * I		Insert at beginning of whitespace of line,

		 *		short for ^i.

		 */

		case 'I':

			operate('^', 1);

			c = 'i';

			/* fall into ... */

		/*

		 * R		Replace characters, one for one, by input

		 *		(logically), like repeated r commands.

		 *

		 * BUG:		This is like the typeover mode of many other

		 *		editors, and is only rarely useful.  Its

		 *		implementation is a hack in a low level

		 *		routine and it doesn't work very well, e.g.

		 *		you can't move around within a R, etc.

		 */

		case 'R':

			/* fall into... */

		/*

		 * i		Insert text to an escape in the buffer.

		 *		Text is arbitrary.  This command reminds of

		 *		the i command in bare teco.

		 */

		case 'i':

insrt:

			/*

			 * Common code for all the insertion commands.

			 * Save for redo, position cursor, prepare for append

			 * at command and in visual undo.  Note that nothing

			 * is doomed, unless R when all is, and save the

			 * current line in a the undo temporary buffer.

			 */

			vmacchng(1);

			setLAST();

			vcursat(cursor);

			prepapp();

			vnoapp();

			doomed = c == 'R' ? 10000 : 0;

			if(FIXUNDO)

				vundkind = VCHNG;

			vmoving = 0;

			CP(vutmp, linebuf);

			/*

			 * If this is a repeated command, then suppress

			 * fake insert mode on dumb terminals which looks

			 * ridiculous and wastes lots of time even at 9600B.

			 */

			if (vglobp)

				hold = HOLDQIK;

			vappend(c, cnt, 0);

			continue;

		/*

		 * ^?		An attention, normally a ^?, just beeps.

		 *		If you are a vi command within ex, then

		 *		two ATTN's will drop you back to command mode.

		 */

case_ATTN:

			beep();

			if (initev || peekkey() != ATTN)

				continue;

			/* fall into... */

		/*

		 * ^\		A quit always gets command mode.

		 */

		case QUIT:

			/*

			 * Have to be careful if we were called

			 *	g/xxx/vi

			 * since a return will just start up again.

			 * So we simulate an interrupt.

			 */

			if (inglobal)

				onintr(SIGINT);

			/* fall into... */

#ifdef notdef

		/*

		 * q		Quit back to command mode, unless called as

		 *		vi on command line in which case dont do it

		 */

		case 'q':	/* quit */

			if (initev) {

				vsave();

				CATCH

					error(catgets(catd, 1, 226,

				"Q gets ex command mode, :q leaves vi"));

				ENDCATCH

				splitw = 0;

				getDOT();

				vrepaint(cursor);

				continue;

			}

#endif

			/* fall into... */

		/*

		 * Q		Is like q, but always gets to command mode

		 *		even if command line invocation was as vi.

		 */

		case 'Q':

			vsave();

			/*

			 * If we are in the middle of a macro, throw away

			 * the rest and fix up undo.

			 * This code copied from getbr().

			 */

			if (vmacp) {

				vmacp = 0;

				if (inopen == -1)	/* don't screw up undo for esc esc */

					vundkind = VMANY;

				inopen = 1;	/* restore old setting now that macro done */

			}

			return;

		/*

		 * ZZ		Like :x

		 */

		 case 'Z':

			forbid(getkey() != 'Z');

			oglobp = globp;

			globp = "x";

			vclrech(0);

			goto gogo;

		/*

		 * P		Put back text before cursor or before current

		 *		line.  If text was whole lines goes back

		 *		as whole lines.  If part of a single line

		 *		or parts of whole lines splits up current

		 *		line to form many new lines.

		 *		May specify a named buffer, or the delete

		 *		saving buffers 1-9.

		 *

		 * p		Like P but after rather than before.

		 */

		case 'P':

		case 'p':

			vmoving = 0;

#ifdef notdef

			forbid (!vreg && value(UNDOMACRO) && inopen < 0);

#endif

			/*

			 * If previous delete was partial line, use an

			 * append or insert to put it back so as to

			 * use insert mode on intelligent terminals.

			 */

			if (!vreg && DEL[0]) {

				forbid ((DEL[0] & (QUOTE|TRIM)) == OVERBUF);

				vglobp = DEL;

				ungetkey(c == 'p' ? 'a' : 'i');

				goto reread;

			}

			/*

			 * If a register wasn't specified, then make

			 * sure there is something to put back.

			 */

			forbid (!vreg && unddol == dol);

			/*

			 * If we just did a macro the whole buffer is in

			 * the undo save area.  We don't want to put THAT.

			 */

			forbid (vundkind == VMANY && undkind==UNDALL);

			vsave();

			vmacchng(1);

			setLAST();

			i = 0;