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The start of KNF + -Wall.  The code has been run through indent but
needs hand fixup.  I stopped at keymap.c...

/*
 *		Assorted commands.
 * The file contains the command
 * processors for a large assortment of unrelated
 * commands. The only thing they have in common is
 * that they are all command processors.
 */
#include	"def.h"

/*
 * Display a bunch of useful information about
 * the current location of dot. The character under the
 * cursor (in octal), the current line, row, and column, and
 * approximate position of the cursor in the file (as a percentage)
 * is displayed. The column position assumes an infinite position
 * display; it does not truncate just because the screen does.
 * This is normally bound to "C-X =".
 */
/* ARGSUSED */
showcpos(f, n)
{
	register LINE  *clp;
	register long   nchar;
	long            cchar;
	register int    nline, row;
	int             cline, cbyte;	/* Current line/char/byte */
	int             ratio;

	clp = lforw(curbp->b_linep);	/* Collect the data.	 */
	nchar = 0;
	nline = 0;
	for (;;) {
		++nline;	/* Count this line	 */
		if (clp == curwp->w_dotp) {
			cline = nline;	/* Mark line		 */
			cchar = nchar + curwp->w_doto;
			if (curwp->w_doto == llength(clp))
				cbyte = '\n';
			else
				cbyte = lgetc(clp, curwp->w_doto);
		}
		nchar += llength(clp);	/* Now count the chars	 */
		clp = lforw(clp);
		if (clp == curbp->b_linep)
			break;
		nchar++;	/* count the newline	 */
	}
	row = curwp->w_toprow + 1;	/* Determine row.	 */
	clp = curwp->w_linep;
	while (clp != curbp->b_linep && clp != curwp->w_dotp) {
		++row;
		clp = lforw(clp);
	}
	/* NOSTRICT */
	ratio = nchar ? (100L * cchar) / nchar : 100;
	ewprintf("Char: %c (0%o)  point=%ld(%d%%)  line=%d  row=%d  col=%d",
		 cbyte, cbyte, cchar, ratio, cline, row, getcolpos());
	return TRUE;
}

getcolpos()
{
	register int    col, i, c;

	col = 1;		/* Determine column.	 */
	for (i = 0; i < curwp->w_doto; ++i) {
		c = lgetc(curwp->w_dotp, i);
		if (c == '\t'
#ifdef	NOTAB
		    && !(curbp->b_flag & BFNOTAB)
#endif
			) {
			col |= 0x07;
			++col;
		} else if (ISCTRL(c) != FALSE)
			++col;
		++col;
	}
	return col;
}
/*
 * Twiddle the two characters on either side of
 * dot. If dot is at the end of the line twiddle the
 * two characters before it. Return with an error if dot
 * is at the beginning of line; it seems to be a bit
 * pointless to make this work. This fixes up a very
 * common typo with a single stroke. Normally bound
 * to "C-T". This always works within a line, so
 * "WFEDIT" is good enough.
 */
/* ARGSUSED */
twiddle(f, n)
{
	register LINE  *dotp;
	register int    doto;
	register int    cr;
	VOID            lchange();

	dotp = curwp->w_dotp;
	doto = curwp->w_doto;
	if (doto == llength(dotp)) {
		if (--doto <= 0)
			return FALSE;
	} else {
		if (doto == 0)
			return FALSE;
		++curwp->w_doto;
	}
	cr = lgetc(dotp, doto--);
	lputc(dotp, doto + 1, lgetc(dotp, doto));
	lputc(dotp, doto, cr);
	lchange(WFEDIT);
	return TRUE;
}

/*
 * Open up some blank space. The basic plan
 * is to insert a bunch of newlines, and then back
 * up over them. Everything is done by the subcommand
 * procerssors. They even handle the looping. Normally
 * this is bound to "C-O".
 */
/* ARGSUSED */
openline(f, n)
{
	register int    i;
	register int    s;

	if (n < 0)
		return FALSE;
	if (n == 0)
		return TRUE;
	i = n;			/* Insert newlines.	 */
	do {
		s = lnewline();
	} while (s == TRUE && --i);
	if (s == TRUE)		/* Then back up overtop */
		s = backchar(f | FFRAND, n);	/* of them all.		 */
	return s;
}

/*
 * Insert a newline.
 * [following "feature" not present in current version of
 *  Gnu, and now disabled here too]
 * If you are at the end of the line and the
 * next line is a blank line, just move into the
 * blank line. This makes "C-O" and "C-X C-O" work
 * nicely, and reduces the ammount of screen
 * update that has to be done. This would not be
 * as critical if screen update were a lot
 * more efficient.
 */
/* ARGSUSED */
newline(f, n)
{
	register LINE  *lp;
	register int    s;

	if (n < 0)
		return FALSE;
	while (n--) {
		lp = curwp->w_dotp;
#ifdef undef
		if (llength(lp) == curwp->w_doto
		    && lforw(lp) != curbp->b_linep
		    && llength(lforw(lp)) == 0) {
			if ((s = forwchar(FFRAND, 1)) != TRUE)
				return s;
		} else
#endif
		if ((s = lnewline()) != TRUE)
			return s;
	}
	return TRUE;
}

/*
 * Delete blank lines around dot.
 * What this command does depends if dot is
 * sitting on a blank line. If dot is sitting on a
 * blank line, this command deletes all the blank lines
 * above and below the current line. If it is sitting
 * on a non blank line then it deletes all of the
 * blank lines after the line. Normally this command
 * is bound to "C-X C-O". Any argument is ignored.
 */
/* ARGSUSED */
deblank(f, n)
{
	register LINE  *lp1;
	register LINE  *lp2;
	register RSIZE  nld;

	lp1 = curwp->w_dotp;
	while (llength(lp1) == 0 && (lp2 = lback(lp1)) != curbp->b_linep)
		lp1 = lp2;
	lp2 = lp1;
	nld = (RSIZE) 0;
	while ((lp2 = lforw(lp2)) != curbp->b_linep && llength(lp2) == 0)
		++nld;
	if (nld == 0)
		return (TRUE);
	curwp->w_dotp = lforw(lp1);
	curwp->w_doto = 0;
	return ldelete((RSIZE) nld, KNONE);
}

/*
 * Delete any whitespace around dot, then insert a space.
 */
justone(f, n)
{
	(VOID) delwhite(f, n);
	return linsert(1, ' ');
}
/*
 * Delete any whitespace around dot.
 */
/* ARGSUSED */
delwhite(f, n)
{
	register int    col, c, s;

	col = curwp->w_doto;
	while (((c = lgetc(curwp->w_dotp, col)) == ' ' || c == '\t')
	       && col < llength(curwp->w_dotp))
		++col;
	do {
		if (curwp->w_doto == 0) {
			s = FALSE;
			break;
		}
		if ((s = backchar(FFRAND, 1)) != TRUE)
			break;
	} while ((c = lgetc(curwp->w_dotp, curwp->w_doto)) == ' ' || c == '\t');

	if (s == TRUE)
		(VOID) forwchar(FFRAND, 1);
	(VOID) ldelete((RSIZE) (col - curwp->w_doto), KNONE);
	return TRUE;
}
/*
 * Insert a newline, then enough
 * tabs and spaces to duplicate the indentation
 * of the previous line. Assumes tabs are every eight
 * characters. Quite simple. Figure out the indentation
 * of the current line. Insert a newline by calling
 * the standard routine. Insert the indentation by
 * inserting the right number of tabs and spaces.
 * Return TRUE if all ok. Return FALSE if one
 * of the subcomands failed. Normally bound
 * to "C-J".
 */
/* ARGSUSED */
indent(f, n)
{
	register int    nicol;
	register int    c;
	register int    i;

	if (n < 0)
		return (FALSE);
	while (n--) {
		nicol = 0;
		for (i = 0; i < llength(curwp->w_dotp); ++i) {
			c = lgetc(curwp->w_dotp, i);
			if (c != ' ' && c != '\t')
				break;
			if (c == '\t')
				nicol |= 0x07;
			++nicol;
		}
		if (lnewline() == FALSE || ((
#ifdef	NOTAB
					     curbp->b_flag & BFNOTAB) ?
					    linsert(nicol, ' ') == FALSE : (
#endif
		      ((i = nicol / 8) != 0 && linsert(i, '\t') == FALSE) ||
		       ((i = nicol % 8) != 0 && linsert(i, ' ') == FALSE))))
			return FALSE;
	}
	return TRUE;
}

/*
 * Delete forward. This is real
 * easy, because the basic delete routine does
 * all of the work. Watches for negative arguments,
 * and does the right thing. If any argument is
 * present, it kills rather than deletes, to prevent
 * loss of text if typed with a big argument.
 * Normally bound to "C-D".
 */
/* ARGSUSED */
forwdel(f, n)
{
	if (n < 0)
		return backdel(f | FFRAND, -n);
	if (f & FFARG) {	/* Really a kill.	 */
		if ((lastflag & CFKILL) == 0)
			kdelete();
		thisflag |= CFKILL;
	}
	return ldelete((RSIZE) n, (f & FFARG) ? KFORW : KNONE);
}

/*
 * Delete backwards. This is quite easy too,
 * because it's all done with other functions. Just
 * move the cursor back, and delete forwards.
 * Like delete forward, this actually does a kill
 * if presented with an argument.
 */
/* ARGSUSED */
backdel(f, n)
{
	register int    s;

	if (n < 0)
		return forwdel(f | FFRAND, -n);
	if (f & FFARG) {	/* Really a kill.	 */
		if ((lastflag & CFKILL) == 0)
			kdelete();
		thisflag |= CFKILL;
	}
	if ((s = backchar(f | FFRAND, n)) == TRUE)
		s = ldelete((RSIZE) n, (f & FFARG) ? KFORW : KNONE);
	return s;
}

/*
 * Kill line. If called without an argument,
 * it kills from dot to the end of the line, unless it
 * is at the end of the line, when it kills the newline.
 * If called with an argument of 0, it kills from the
 * start of the line to dot. If called with a positive
 * argument, it kills from dot forward over that number
 * of newlines. If called with a negative argument it
 * kills any text before dot on the current line,
 * then it kills back abs(arg) lines.
 */
/* ARGSUSED */
killline(f, n)
{
	register RSIZE  chunk;
	register LINE  *nextp;
	register int    i, c;
	VOID            kdelete();

	if ((lastflag & CFKILL) == 0)	/* Clear kill buffer if */
		kdelete();	/* last wasn't a kill.	 */
	thisflag |= CFKILL;
	if (!(f & FFARG)) {
		for (i = curwp->w_doto; i < llength(curwp->w_dotp); ++i)
			if ((c = lgetc(curwp->w_dotp, i)) != ' ' && c != '\t')
				break;
		if (i == llength(curwp->w_dotp))
			chunk = llength(curwp->w_dotp) - curwp->w_doto + 1;
		else {
			chunk = llength(curwp->w_dotp) - curwp->w_doto;
			if (chunk == 0)
				chunk = 1;
		}
	} else if (n > 0) {
		chunk = llength(curwp->w_dotp) - curwp->w_doto + 1;
		nextp = lforw(curwp->w_dotp);
		i = n;
		while (--i) {
			if (nextp == curbp->b_linep)
				break;
			chunk += llength(nextp) + 1;
			nextp = lforw(nextp);
		}
	} else {		/* n <= 0		 */
		chunk = curwp->w_doto;
		curwp->w_doto = 0;
		i = n;
		while (i++) {
			if (lback(curwp->w_dotp) == curbp->b_linep)
				break;
			curwp->w_dotp = lback(curwp->w_dotp);
			curwp->w_flag |= WFMOVE;
			chunk += llength(curwp->w_dotp) + 1;
		}
	}
	/*
	 * KFORW here is a bug. Should be KBACK/KFORW, but we need to
	 * rewrite the ldelete code (later)?
	 */
	return (ldelete(chunk, KFORW));
}

/*
 * Yank text back from the kill buffer. This
 * is really easy. All of the work is done by the
 * standard insert routines. All you do is run the loop,
 * and check for errors. The blank
 * lines are inserted with a call to "newline"
 * instead of a call to "lnewline" so that the magic
 * stuff that happens when you type a carriage
 * return also happens when a carriage return is
 * yanked back from the kill buffer.
 * An attempt has been made to fix the cosmetic bug
 * associated with a yank when dot is on the top line of
 * the window (nothing moves, because all of the new
 * text landed off screen).
 */
/* ARGSUSED */
yank(f, n)
{
	register int    c;
	register int    i;
	register LINE  *lp;
	register int    nline;
	VOID            isetmark();

	if (n < 0)
		return FALSE;
	nline = 0;		/* Newline counting.	 */
	while (n--) {
		isetmark();	/* mark around last yank */
		i = 0;
		while ((c = kremove(i)) >= 0) {
			if (c == '\n') {
				if (newline(FFRAND, 1) == FALSE)
					return FALSE;
				++nline;
			} else {
				if (linsert(1, c) == FALSE)
					return FALSE;
			}
			++i;
		}
	}
	lp = curwp->w_linep;	/* Cosmetic adjustment	 */
	if (curwp->w_dotp == lp) {	/* if offscreen insert. */
		while (nline-- && lback(lp) != curbp->b_linep)
			lp = lback(lp);
		curwp->w_linep = lp;	/* Adjust framing.	 */
		curwp->w_flag |= WFHARD;
	}
	return TRUE;
}

#ifdef	NOTAB
/* ARGSUSED */
space_to_tabstop(f, n)
	int             f, n;
{
	if (n < 0)
		return FALSE;
	if (n == 0)
		return TRUE;
	return linsert((n << 3) - (curwp->w_doto & 7), ' ');
}
#endif