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When system calls indicate an error they return -1, not some arbitrary
value < 0.  errno is only updated in this case.  Change all (most?)
callers of syscalls to follow this better, and let's see if this strictness
helps us in the future.

/*	$OpenBSD: hack.tty.c,v 1.16 2019/06/28 13:32:52 deraadt Exp $	*/

/*-
 * Copyright (c) 1988, 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. 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) 1985, Stichting Centrum voor Wiskunde en Informatica,
 * Amsterdam
 * 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 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.
 *
 * - Neither the name of the Stichting Centrum voor Wiskunde en
 * Informatica, 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
 * 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) 1982 Jay Fenlason <hack@gnu.org>
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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.
 */

/* hack.tty.c - version 1.0.3 */
/* With thanks to the people who sent code for SYSV - hpscdi!jon,
   arnold@ucsf-cgl, wcs@bo95b, cbcephus!pds and others. */

#include <stdio.h>
#include <stdlib.h>
#include <termios.h>

#include "hack.h"

static char erase_char, kill_char;
static boolean settty_needed = FALSE;
struct termios inittyb, curttyb;

static void setctty(void);

/*
 * Get initial state of terminal,
 * and switch off tab expansion if necessary.
 * Called by startup() in termcap.c and after returning from ! or ^Z
 */
void
gettty(void)
{
	if(tcgetattr(0, &inittyb) == -1)
		perror("Hack (gettty)");
	curttyb = inittyb;
	erase_char = inittyb.c_cc[VERASE];
	kill_char = inittyb.c_cc[VKILL];
	getioctls();

	/* do not expand tabs - they might be needed inside a cm sequence */
	if(curttyb.c_oflag & OXTABS) {
		curttyb.c_oflag &= ~OXTABS;
		setctty();
	}
	settty_needed = TRUE;
}

/* reset terminal to original state */
void
settty(char *s)
{
	clr_screen();
	end_screen();
	if(s) printf("%s", s);
	(void) fflush(stdout);
	if(tcsetattr(0, TCSADRAIN, &inittyb) == -1)
		perror("Hack (settty)");
	flags.echo = (inittyb.c_lflag & ECHO) ? ON : OFF;
	flags.cbreak = (inittyb.c_lflag & ICANON) ? OFF : ON;
	setioctls();
}

static void
setctty(void)
{
	if(tcsetattr(0, TCSADRAIN, &curttyb) == -1)
		perror("Hack (setctty)");
}

void
setftty(void)
{
	int change = 0;
	flags.cbreak = ON;
	flags.echo = OFF;
	/* Should use (ECHO|CRMOD) here instead of ECHO */
	if(curttyb.c_lflag & ECHO){
		curttyb.c_lflag &= ~ECHO;
		change++;
	}
	if(curttyb.c_lflag & ICANON){
		curttyb.c_lflag &= ~ICANON;
		/* be satisfied with one character; no timeout */
		curttyb.c_cc[VMIN] = 1;
		curttyb.c_cc[VTIME] = 0;
		/* we need to be able to read ^Z */
		curttyb.c_cc[VSUSP] = _POSIX_VDISABLE;
		change++;
	}
	if(change){
		setctty();
	}
	start_screen();
}


/* fatal error */
void
error(const char *s, ...)
{
	va_list ap;

	if(settty_needed)
		settty(NULL);
	va_start(ap, s);
	vprintf(s, ap);
	va_end(ap);
	putchar('\n');
	exit(1);
}

/*
 * Read a line closed with '\n' into the array char bufp[BUFSZ].
 * (The '\n' is not stored. The string is closed with a '\0'.)
 * Reading can be interrupted by an escape ('\033') - now the
 * resulting string is "\033".
 */
void
getlin(char *bufp)
{
	char *obufp = bufp;
	int c;

	flags.toplin = 2;		/* nonempty, no --More-- required */
	for(;;) {
		(void) fflush(stdout);
		if((c = getchar()) == EOF) {
			*bufp = 0;
			return;
		}
		if(c == '\033') {
			*obufp = c;
			obufp[1] = 0;
			return;
		}
		if(c == erase_char || c == '\b') {
			if(bufp != obufp) {
				bufp--;
				putstr("\b \b"); /* putsym converts \b */
			} else	hackbell();
		} else if(c == '\n') {
			*bufp = 0;
			return;
		} else if(' ' <= c && c < '\177') {
				/* avoid isprint() - some people don't have it
				   ' ' is not always a printing char */
			*bufp = c;
			bufp[1] = 0;
			putstr(bufp);
			if(bufp-obufp < BUFSZ-1 && bufp-obufp < COLNO)
				bufp++;
		} else if(c == kill_char || c == '\177') { /* Robert Viduya */
				/* this test last - @ might be the kill_char */
			while(bufp != obufp) {
				bufp--;
				putstr("\b \b");
			}
		} else
			hackbell();
	}
}

void
getret(void)
{
	cgetret("");
}

void
cgetret(char *s)
{
	putsym('\n');
	if(flags.standout)
		standoutbeg();
	putstr("Hit ");
	putstr(flags.cbreak ? "space" : "return");
	putstr(" to continue: ");
	if(flags.standout)
		standoutend();
	xwaitforspace(s);
}

char morc;	/* tell the outside world what char he used */

/* s: chars allowed besides space or return */
void
xwaitforspace(char *s)
{
	int c;

	morc = 0;

	while((c = readchar()) != '\n') {
	    if(flags.cbreak) {
		if(c == ' ') break;
		if(s && strchr(s,c)) {
			morc = c;
			break;
		}
		hackbell();
	    }
	}
}

char *
parse(void)
{
	static char inputline[COLNO];
	int foo;

	flags.move = 1;
	if(!Invisible) curs_on_u(); else home();
	while((foo = readchar()) >= '0' && foo <= '9')
		multi = 10*multi+foo-'0';
	if(multi) {
		multi--;
		save_cm = inputline;
	}
	inputline[0] = foo;
	inputline[1] = 0;
	if(foo == 'f' || foo == 'F'){
		inputline[1] = getchar();
#ifdef QUEST
		if(inputline[1] == foo) inputline[2] = getchar(); else
#endif /* QUEST */
		inputline[2] = 0;
	}
	if(foo == 'm' || foo == 'M'){
		inputline[1] = getchar();
		inputline[2] = 0;
	}
	clrlin();
	return(inputline);
}

char
readchar(void)
{
	int sym;

	(void) fflush(stdout);
	if((sym = getchar()) == EOF)
		end_of_input();
	if(flags.toplin == 1)
		flags.toplin = 2;
	return((char) sym);
}

void
end_of_input(void)
{
	settty("End of input?\n");
	clearlocks();
	exit(0);
}