ex_get.c

/*
 * 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_get.c	1.17 (gritter) 2/17/05";
#endif
#endif

/* from ex_get.c	7.6 (Berkeley) 6/7/85 */

#include "ex.h"
#include "ex_tty.h"

/*
 * Input routines for command mode.
 * Since we translate the end of reads into the implied ^D's
 * we have different flavors of routines which do/don't return such.
 */
static	bool junkbs;
int	lastc = '\n';

void 
ignchar(void)
{
	ignore(getchar());
}

int 
getach(void)
{
	register int c;
	static char in_line[BUFSIZ];
	/* struct stat statb; */

	c = peekc;
	if (c != 0) {
		peekc = 0;
		return (c);
	}
	if (globp) {
		if (*globp)
			return (*globp++&0377);
		globp = 0;
		return (lastc = EOF);
	}
top:
	if (input) {
		if (c = *input++&0377) {
			if (verbose && !intty)
				write(2, &input[-1], 1);
			if (c &= TRIM)
				return (lastc = c);
			goto top;
		}
		input = 0;
	}
	flush();
	if (intty) {
		c = read(0, in_line, sizeof in_line - 4);
		if (c < 0)
			return (lastc = EOF);
		if (c == 0 || in_line[c-1] != '\n')
			in_line[c++] = CTRL('d');
		if (in_line[c-1] == '\n')
			noteinp();
		in_line[c] = 0;
		for (c--; c >= 0; c--)
			if (in_line[c] == 0)
#ifndef	BIT8
				in_line[c] = QUOTE;
#else
				in_line[c] = '\200';
#endif
		input = in_line;
		goto top;
	}
	c = read(0, in_line, sizeof in_line - 1);
	if(c <= 0)
		return(lastc = EOF);
	in_line[c] = '\0';
	input = in_line;
	goto top;
}

int
getchar(void)
{
	register int c;

	do
		c = getcd();
	while (!globp && c == CTRL('d'));
	return (c);
}

void 
checkjunk(int c)
{

	if (junkbs == 0 && c == '\b') {
		write(2, cntrlhm, 13);
		junkbs = 1;
	}
}

int 
getcd(void)
{
	register int c;

again:
	c = getach();
	if (c == EOF)
		return (c);
	c &= TRIM;
	if (!inopen)
		if (!globp && c == CTRL('d'))
			setlastchar('\n');
		else if (junk(c)) {
			checkjunk(c);
			goto again;
		}
	return (c);
}

int 
peekchar(void)
{

	if (peekc == 0)
		peekc = getchar();
	return (peekc);
}

int 
peekcd(void)
{
	if (peekc == 0)
		peekc = getcd();
	return (peekc);
}

/*
 * Crunch the indent.
 * Hard thing here is that in command mode some of the indent
 * is only implicit, so we must seed the column counter.
 * This should really be done differently so as to use the whitecnt routine
 * and also to hack indenting for LISP.
 */
int 
smunch(register int col, char *ocp)
{
	register char *cp;

	cp = ocp;
	for (;;)
		switch (*cp++) {

		case ' ':
			col++;
			continue;

		case '\t':
			col += value(TABSTOP) - (col % value(TABSTOP));
			continue;

		default:
			cp--;
			CP(ocp, cp);
			return (col);
		}
}

/*
 * Input routine for insert/append/change in command mode.
 * Most work here is in handling autoindent.
 */
static	short	lastin;

int 
gettty(void)
{
	register int c = 0;
	register char *cp = genbuf;
	char hadup = 0;
	int offset = Pline == numbline ? 8 : 0;
	int ch;

	if (intty && !inglobal) {
		if (offset) {
			holdcm = 1;
			printf("  %4d  ", lineDOT() + 1);
			flush();
			holdcm = 0;
		}
		if (value(AUTOINDENT) ^ aiflag) {
			holdcm = 1;
#ifdef LISPCODE
			if (value(LISP))
				lastin = lindent(dot + 1);
#endif
			tab(lastin + offset);
			while ((c = getcd()) == CTRL('d')) {
				if (lastin == 0 && isatty(0) == -1) {
					holdcm = 0;
					return (EOF);
				}
				lastin = backtab(lastin);
				tab(lastin + offset);
			}
			switch (c) {

			case '^':
			case '0':
				ch = getcd();
				if (ch == CTRL('d')) {
					if (c == '0')
						lastin = 0;
					if (!OS) {
						putchar('\b' | QUOTE);
						putchar(' ' | QUOTE);
						putchar('\b' | QUOTE);
					}
					tab(offset);
					hadup = 1;
					c = getchar();
				} else
					ungetchar(ch);
				break;

			case '.':
				if (peekchar() == '\n') {
					ignchar();
					noteinp();
					holdcm = 0;
					return (EOF);
				}
				break;

			case '\n':
				hadup = 1;
				break;
			}
		}
		flush();
		holdcm = 0;
	}
	if (c == 0)
		c = getchar();
	while (c != EOF && c != '\n') {
		if (cp > &genbuf[LBSIZE - 2])
			error(catgets(catd, 1, 71, "Input line too long"));
		*cp++ = c;
		c = getchar();
	}
	if (c == EOF) {
		if (inglobal)
			ungetchar(EOF);
		return (EOF);
	}
	*cp = 0;
	cp = linebuf;
	if ((value(AUTOINDENT) ^ aiflag) && hadup == 0 && intty && !inglobal) {
		lastin = c = smunch(lastin, genbuf);
		for (c = lastin; c >= value(TABSTOP); c -= value(TABSTOP))
			*cp++ = '\t';
		for (; c > 0; c--)
			*cp++ = ' ';
	}
	CP(cp, genbuf);
	if (linebuf[0] == '.' && linebuf[1] == 0)
		return (EOF);
	return (0);
}

void
setin(line *addr)
{

	if (addr == zero)
		lastin = 0;
	else
		getline(*addr), lastin = smunch(0, linebuf);
}