/* Copyright (c) 1979 Regents of the University of California */
#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);
	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 lint
	char *seekpt;
#else
	int seekpt;
#endif
	int i;
{
	register char *cp = linebuf;

	if (seekpt == 0)
		return;
	merror1(seekpt);
	if (*cp == '\n')
		putnl(), cp++;
	if (inopen && CE)
		vclreol();
	if (SO && SE)
		putpad(SO);
	printf(mesg(cp), i);
	if (SO && SE)
		putpad(SE);
}

merror1(seekpt)
#ifdef lint
	char *seekpt;
#else
	int seekpt;
#endif
{

	lseek(erfile, (long) seekpt, 0);
	if (read(erfile, linebuf, 128) < 2)
		CP(linebuf, "ERROR");
}

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;

	*addr &= ~1;
	for (markp = (anymarks ? names : &names['z'-'a'+1]);
	  markp <= &names['z'-'a'+1]; markp++)
		if (*markp == *addr)
			*markp = n;
	*addr = n;
}

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;

	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 or re");
	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;
}

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);
}

#define	std_nerrs (sizeof std_errlist / sizeof std_errlist[0])

#define	error(i)	i

#ifdef lint
char	*std_errlist[] = {
#else
short	std_errlist[] = {
#endif
	error("Error 0"),
	error("Not super-user"),
	error("No such file or directory"),
	error("No such process"),
	error("Interrupted system call"),
	error("Physical I/O error"),
	error("No such device or address"),
	error("Argument list too long"),
	error("Exec format error"),
	error("Bad file number"),
	error("No children"),
	error("No more processes"),
	error("Not enough core"),
	error("Permission denied"),
	error("Bad address"),
	error("Block device required"),
	error("Mount device busy"),
	error("File exists"),
	error("Cross-device link"),
	error("No such device"),
	error("Not a directory"),
	error("Is a directory"),
	error("Invalid argument"),
	error("File table overflow"),
	error("Too many open files"),
	error("Not a typewriter"),
	error("Text file busy"),
	error("File too large"),
	error("No space left on device"),
	error("Illegal seek"),
	error("Read-only file system"),
	error("Too many links"),
	error("Broken pipe"),
#ifndef V6
	error("Math argument"),
	error("Result too large"),
#endif
	error("Quota exceeded")		/* Berkeley quota systems only */
};

#undef	error

char *
strend(cp)
	register char *cp;
{

	while (*cp)
		cp++;
	return (cp);
}

strcLIN(dp)
	char *dp;
{

	CP(linebuf, dp);
}

syserror()
{
	register int e = errno;

	dirtcnt = 0;
	putchar(' ');
	if (e >= 0 && errno <= std_nerrs)
		error(std_errlist[e]);
	else
		error("System error %d", e);
}

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();
}