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/*

 * Copyright (c) 1980 Regents of the University of California.

 * All rights reserved.  The Berkeley software License Agreement

 * specifies the terms and conditions for redistribution.

 */

#if	!defined(lint) && defined(DOSCCS)

static char *sccsid = "@(#)ex_subr.c	7.10.1 (2.11BSD) 1996/3/22";

#endif

#include "ex.h"

#include "ex_re.h"

#include "ex_tty.h"

#include "ex_vis.h"

/*

 * Random routines, in alphabetical order.

 */

any(c, s)

	int c;

	register char *s;

{

	register int x;

	while (x = *s++)

		if (x == c)

			return (1);

	return (0);

}

backtab(i)

	register int i;

{

	register int j;

	j = i % value(SHIFTWIDTH);

	if (j == 0)

		j = value(SHIFTWIDTH);

	i -= j;

	if (i < 0)

		i = 0;

	return (i);

}

change()

{

	tchng++;

	chng = tchng;

}

/*

 * Column returns the number of

 * columns occupied by printing the

 * characters through position cp of the

 * current line.

 */

column(cp)

	register char *cp;

{

	if (cp == 0)

		cp = &linebuf[LBSIZE - 2];

	return (qcolumn(cp, (char *) 0));

}

/*

 * Ignore a comment to the end of the line.

 * This routine eats the trailing newline so don't call newline().

 */

comment()

{

	register int c;

	do {

		c = getchar();

	} while (c != '\n' && c != EOF);

	if (c == EOF)

		ungetchar(c);

}

Copy(to, from, size)

	register char *from, *to;

	register int size;

{

	if (size > 0)

		do

			*to++ = *from++;

		while (--size > 0);

}

copyw(to, from, size)

	register line *from, *to;

	register int size;

{

	if (size > 0)

		do

			*to++ = *from++;

		while (--size > 0);

}

copywR(to, from, size)

	register line *from, *to;

	register int size;

{

	while (--size >= 0)

		to[size] = from[size];

}

ctlof(c)

	int c;

{

	return (c == TRIM ? '?' : c | ('A' - 1));

}

dingdong()

{

	if (VB)

		putpad(VB);

	else if (value(ERRORBELLS))

		putch('\207');

}

fixindent(indent)

	int indent;

{

	register int i;

	register char *cp;

	i = whitecnt(genbuf);

	cp = vpastwh(genbuf);

	if (*cp == 0 && i == indent && linebuf[0] == 0) {

		genbuf[0] = 0;

		return (i);

	}

	CP(genindent(i), cp);

	return (i);

}

filioerr(cp)

	char *cp;

{

	register int oerrno = errno;

	lprintf("\"%s\"", cp);

	errno = oerrno;

	syserror();

}

char *

genindent(indent)

	register int indent;

{

	register char *cp;

	for (cp = genbuf; indent >= value(TABSTOP); indent -= value(TABSTOP))

		*cp++ = '\t';

	for (; indent > 0; indent--)

		*cp++ = ' ';

	return (cp);

}

getDOT()

{

	getline(*dot);

}

line *

getmark(c)

	register int c;

{

	register line *addr;

	for (addr = one; addr <= dol; addr++)

		if (names[c - 'a'] == (*addr &~ 01)) {

			return (addr);

		}

	return (0);

}

getn(cp)

	register char *cp;

{

	register int i = 0;

	while (isdigit(*cp))

		i = i * 10 + *cp++ - '0';

	if (*cp)

		return (0);

	return (i);

}

ignnEOF()

{

	register int c = getchar();

	if (c == EOF)

		ungetchar(c);

	else if (c=='"')

		comment();

}

iswhite(c)

	int c;

{

	return (c == ' ' || c == '\t');

}

junk(c)

	register int c;

{

	if (c && !value(BEAUTIFY))

		return (0);

	if (c >= ' ' && c != TRIM)

		return (0);

#ifdef	ISO

	if (c & QUOTE && !niso(c))

		return (0);

#endif

	switch (c) {

	case '\t':

	case '\n':

	case '\f':

		return (0);

	default:

		return (1);

	}

}

killed()

{

	killcnt(addr2 - addr1 + 1);

}

killcnt(cnt)

	register int cnt;

{

	if (inopen) {

		notecnt = cnt;

		notenam = notesgn = "";

		return;

	}

	if (!notable(cnt))

		return;

	printf("%d lines", cnt);

	if (value(TERSE) == 0) {

		printf(" %c%s", Command[0] | ' ', Command + 1);

		if (Command[strlen(Command) - 1] != 'e')

			putchar('e');

		putchar('d');

	}

	putNFL();

}

lineno(a)

	line *a;

{

	return (a - zero);

}

lineDOL()

{

	return (lineno(dol));

}

lineDOT()

{

	return (lineno(dot));

}

markDOT()

{

	markpr(dot);

}

markpr(which)

	line *which;

{

	if ((inglobal == 0 || inopen) && which <= endcore) {

		names['z'-'a'+1] = *which & ~01;

		if (inopen)

			ncols['z'-'a'+1] = cursor;

	}

}

markreg(c)

	register int c;

{

	if (c == '\'' || c == '`')

		return ('z' + 1);

	if (c >= 'a' && c <= 'z')

		return (c);

	return (0);

}

/*

 * Mesg decodes the terse/verbose strings. Thus

 *	'xxx@yyy' -> 'xxx' if terse, else 'xxx yyy'

 *	'xxx|yyy' -> 'xxx' if terse, else 'yyy'

 * All others map to themselves.

 */

char *

mesg(str)

	register char *str;

{

	register char *cp;

	str = strcpy(genbuf, str);

	for (cp = str; *cp; cp++)

		switch (*cp) {

		case '@':

			if (value(TERSE))

				*cp = 0;

			else

				*cp = ' ';

			break;

		case '|':

			if (value(TERSE) == 0)

				return (cp + 1);

			*cp = 0;

			break;

		}

	return (str);

}

/*VARARGS2*/

merror(seekpt, i)

#ifdef VMUNIX

	char *seekpt;

#else

# ifdef lint

	char *seekpt;

# else

	int seekpt;

# endif

#endif

	int i;

{

	register char *cp = linebuf;

	if (seekpt == 0)

		return;

	merror1(seekpt);

	if (*cp == '\n')

		putnl(), cp++;

	if (inopen > 0 && CE)

		vclreol();

	if (SO && SE)

		putpad(SO);

	printf(mesg(cp), i);

	if (SO && SE)

		putpad(SE);

}

merror1(seekpt)

#ifdef VMUNIX

	char *seekpt;

#else

# ifdef lint

	char *seekpt;

# else

	int seekpt;

# endif

#endif

{

#ifdef VMUNIX

	strcpy(linebuf, seekpt);

#else

	lseek(erfile, (long) seekpt, 0);

	if (read(erfile, linebuf, 128) < 2)

		CP(linebuf, "ERROR");

#endif

}

morelines()

{

	if ((int) sbrk(1024 * sizeof (line)) == -1)

		return (-1);

	endcore += 1024;

	return (0);

}

nonzero()

{

	if (addr1 == zero) {

		notempty();

		error("Nonzero address required@on this command");

	}

}

notable(i)

	int i;

{

	return (hush == 0 && !inglobal && i > value(REPORT));

}

notempty()

{

	if (dol == zero)

		error("No lines@in the buffer");

}

netchHAD(cnt)

	int cnt;

{

	netchange(lineDOL() - cnt);

}

netchange(i)

	register int i;

{

	register char *cp;

	if (i > 0)

		notesgn = cp = "more ";

	else

		notesgn = cp = "fewer ", i = -i;

	if (inopen) {

		notecnt = i;

		notenam = "";

		return;

	}

	if (!notable(i))

		return;

	printf(mesg("%d %slines@in file after %s"), i, cp, Command);

	putNFL();

}

putmark(addr)

	line *addr;

{

	putmk1(addr, putline());

}

putmk1(addr, n)

	register line *addr;

	int n;

{

	register line *markp;

	register oldglobmk;

	oldglobmk = *addr & 1;

	*addr &= ~1;

	for (markp = (anymarks ? names : &names['z'-'a'+1]);

	  markp <= &names['z'-'a'+1]; markp++)

		if (*markp == *addr)

			*markp = n;

	*addr = n | oldglobmk;

}

char *

plural(i)

	long i;

{

	return (i == 1 ? "" : "s");

}

int	qcount();

short	vcntcol;

qcolumn(lim, gp)

	register char *lim, *gp;

{

	register int x;

	int (*OO)();

	OO = Outchar;

	Outchar = qcount;

	vcntcol = 0;

	if (lim != NULL)

		x = lim[1], lim[1] = 0;

	pline(0);

	if (lim != NULL)

		lim[1] = x;

	if (gp)

		while (*gp)

			putchar(*gp++);

	Outchar = OO;

	return (vcntcol);

}

int

qcount(c)

	int c;

{

	if (c == '\t') {

		vcntcol += value(TABSTOP) - vcntcol % value(TABSTOP);

		return;

	}

	vcntcol++;

}

reverse(a1, a2)

	register line *a1, *a2;

{

	register line t;

	for (;;) {

		t = *--a2;

		if (a2 <= a1)

			return;

		*a2 = *a1;

		*a1++ = t;

	}

}

save(a1, a2)

	line *a1;

	register line *a2;

{

	register int more;

	if (!FIXUNDO)

		return;

#ifdef TRACE

	if (trace)

		vudump("before save");

#endif

	undkind = UNDNONE;

	undadot = dot;

	more = (a2 - a1 + 1) - (unddol - dol);

	while (more > (endcore - truedol))

		if (morelines() < 0)

			error("Out of memory@saving lines for undo - try using ed");

	if (more)

		(*(more > 0 ? copywR : copyw))(unddol + more + 1, unddol + 1,

		    (truedol - unddol));

	unddol += more;

	truedol += more;

	copyw(dol + 1, a1, a2 - a1 + 1);

	undkind = UNDALL;

	unddel = a1 - 1;

	undap1 = a1;

	undap2 = a2 + 1;

#ifdef TRACE

	if (trace)

		vudump("after save");

#endif

}

save12()

{

	save(addr1, addr2);

}

saveall()

{

	save(one, dol);

}

span()

{

	return (addr2 - addr1 + 1);

}

sync()

{

	chng = 0;

	tchng = 0;

	xchng = 0;

}

skipwh()

{

	register int wh;

	wh = 0;

	while (iswhite(peekchar())) {

		wh++;

		ignchar();

	}

	return (wh);

}

/*VARARGS2*/

smerror(seekpt, cp)

#ifdef lint

	char *seekpt;

#else

	int seekpt;

#endif

	char *cp;

{

	if (seekpt == 0)

		return;

	merror1(seekpt);

	if (inopen && CE)

		vclreol();

	if (SO && SE)

		putpad(SO);

	lprintf(mesg(linebuf), cp);

	if (SO && SE)

		putpad(SE);

}

char *

strend(cp)

	register char *cp;

{

	while (*cp)

		cp++;

	return (cp);

}

strcLIN(dp)

	char *dp;

{

	CP(linebuf, dp);

}

syserror()

{

	dirtcnt = 0;

	putchar(' ');

	error("%s", strerror(errno));

}

/*

 * Return the column number that results from being in column col and

 * hitting a tab, where tabs are set every ts columns.  Work right for

 * the case where col > COLUMNS, even if ts does not divide COLUMNS.

 */

tabcol(col, ts)

int col, ts;

{

	int offset, result;

	if (col >= COLUMNS) {

		offset = COLUMNS * (col/COLUMNS);

		col -= offset;

	} else

		offset = 0;

	result = col + ts - (col % ts) + offset;

	return (result);

}

char *

vfindcol(i)

	int i;

{

	register char *cp;

	register int (*OO)() = Outchar;

	Outchar = qcount;

	ignore(qcolumn(linebuf - 1, NOSTR));

	for (cp = linebuf; *cp && vcntcol < i; cp++)

		putchar(*cp);

	if (cp != linebuf)

		cp--;

	Outchar = OO;

	return (cp);

}

char *

vskipwh(cp)

	register char *cp;

{

	while (iswhite(*cp) && cp[1])

		cp++;

	return (cp);

}

char *

vpastwh(cp)

	register char *cp;

{

	while (iswhite(*cp))

		cp++;

	return (cp);

}

whitecnt(cp)

	register char *cp;

{

	register int i;

	i = 0;

	for (;;)

		switch (*cp++) {

		case '\t':

			i += value(TABSTOP) - i % value(TABSTOP);

			break;

		case ' ':

			i++;

			break;

		default:

			return (i);

		}

}

#ifdef lint

Ignore(a)

	char *a;

{

	a = a;

}

Ignorf(a)

	int (*a)();

{

	a = a;

}

#endif

markit(addr)

	line *addr;

{

	if (addr != dot && addr >= one && addr <= dol)

		markDOT();

}

/*

 * The following code is defensive programming against a bug in the

 * pdp-11 overlay implementation.  Sometimes it goes nuts and asks

 * for an overlay with some garbage number, which generates an emt

 * trap.  This is a less than elegant solution, but it is somewhat

 * better than core dumping and losing your work, leaving your tty

 * in a weird state, etc.

 */

int _ovno;

onemt()

{

	int oovno;

#ifdef	SIGEMT

	signal(SIGEMT, onemt);

#endif

	oovno = _ovno;

	/* 2 and 3 are valid on 11/40 type vi, so */

	if (_ovno < 0 || _ovno > 3)

		_ovno = 0;

	error("emt trap, _ovno is %d @ - try again");

}

/*

 * When a hangup occurs our actions are similar to a preserve

 * command.  If the buffer has not been [Modified], then we do

 * nothing but remove the temporary files and exit.

 * Otherwise, we sync the temp file and then attempt a preserve.

 * If the preserve succeeds, we unlink our temp files.

 * If the preserve fails, we leave the temp files as they are

 * as they are a backup even without preservation if they

 * are not removed.

 */

void

onhup()

{

	/*

	 * USG tty driver can send multiple HUP's!!

	 */

	signal(SIGINT, SIG_IGN);

	signal(SIGHUP, SIG_IGN);

	if (chng == 0) {

		cleanup(1);

		exit(0);

	}

	if (setexit() == 0) {

		if (preserve()) {

			cleanup(1);

			exit(0);

		}

	}

	exit(1);

}

/*

 * An interrupt occurred.  Drain any output which

 * is still in the output buffering pipeline.

 * Catch interrupts again.  Unless we are in visual

 * reset the output state (out of -nl mode, e.g).

 * Then like a normal error (with the \n before Interrupt

 * suppressed in visual mode).

 */

void

onintr()

{

#ifndef CBREAK

	signal(SIGINT, onintr);

#else

	signal(SIGINT, inopen ? vintr : onintr);

#endif

	alarm(0);	/* in case we were called from map */

	draino();

	if (!inopen) {

		pstop();

		setlastchar('\n');

#ifdef CBREAK

	}

#else

	} else

		vraw();

#endif

	error("\nInterrupt" + inopen);

}

/*

 * If we are interruptible, enable interrupts again.

 * In some critical sections we turn interrupts off,

 * but not very often.

 */

setrupt()

{

	if (ruptible) {

#ifndef CBREAK

		signal(SIGINT, onintr);

#else

		signal(SIGINT, inopen ? vintr : onintr);

#endif

#ifdef SIGTSTP

		if (dosusp)

			signal(SIGTSTP, onsusp);

#endif

	}

}