usr/src/games/hack/hack.tty.c

/*
 * Copyright (c) 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University 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 WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)hack.tty.c  5.2 (Berkeley) 7/22/88";
#endif /* not lint */

/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* 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        "hack.h"
#include        <stdio.h>

/*
 * The distinctions here are not BSD - rest but rather USG - rest, as
 * BSD still has the old sgttyb structure, but SYSV has termio. Thus:
 */
#ifdef BSD
#define V7
#else
#define USG
#endif BSD

/*
 * Some systems may have getchar() return EOF for various reasons, and
 * we should not quit before seeing at least NR_OF_EOFS consecutive EOFs.
 */
#ifndef BSD
#define NR_OF_EOFS      20
#endif BSD


#ifdef USG

#include        <termio.h>
#define termstruct      termio
#define kill_sym        c_cc[VKILL]
#define erase_sym       c_cc[VERASE]
#define EXTABS          TAB3
#define tabflgs         c_oflag
#define echoflgs        c_lflag
#define cbrkflgs        c_lflag
#define CBRKMASK        ICANON
#define CBRKON          ! /* reverse condition */
#define OSPEED(x)       ((x).c_cflag & CBAUD)
#define GTTY(x)         (ioctl(0, TCGETA, x))
#define STTY(x)         (ioctl(0, TCSETA, x))   /* TCSETAF? TCSETAW? */

#else   /* V7 */

#include        <sgtty.h>
#define termstruct      sgttyb
#define kill_sym        sg_kill
#define erase_sym       sg_erase
#define EXTABS          XTABS
#define tabflgs         sg_flags
#define echoflgs        sg_flags
#define cbrkflgs        sg_flags
#define CBRKMASK        CBREAK
#define CBRKON          /* empty */
#define OSPEED(x)       (x).sg_ospeed
#define GTTY(x)         (gtty(0, x))
#define STTY(x)         (stty(0, x))

#endif USG

extern short ospeed;
static char erase_char, kill_char;
static boolean settty_needed = FALSE;
struct termstruct inittyb, curttyb;

/*
 * Get initial state of terminal, set ospeed (for termcap routines)
 * and switch off tab expansion if necessary.
 * Called by startup() in termcap.c and after returning from ! or ^Z
 */
gettty(){
        if(GTTY(&inittyb) < 0)
                perror("Hack (gettty)");
        curttyb = inittyb;
        ospeed = OSPEED(inittyb);
        erase_char = inittyb.erase_sym;
        kill_char = inittyb.kill_sym;
        getioctls();

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

/* reset terminal to original state */
settty(s) char *s; {
        clear_screen();
        end_screen();
        if(s) printf(s);
        (void) fflush(stdout);
        if(STTY(&inittyb) < 0)
                perror("Hack (settty)");
        flags.echo = (inittyb.echoflgs & ECHO) ? ON : OFF;
        flags.cbreak = (CBRKON(inittyb.cbrkflgs & CBRKMASK)) ? ON : OFF;
        setioctls();
}

setctty(){
        if(STTY(&curttyb) < 0)
                perror("Hack (setctty)");
}


setftty(){
register int ef = 0;                    /* desired value of flags & ECHO */
register int cf = CBRKON(CBRKMASK);     /* desired value of flags & CBREAK */
register int change = 0;
        flags.cbreak = ON;
        flags.echo = OFF;
        /* Should use (ECHO|CRMOD) here instead of ECHO */
        if((curttyb.echoflgs & ECHO) != ef){
                curttyb.echoflgs &= ~ECHO;
/*              curttyb.echoflgs |= ef;                                 */
                change++;
        }
        if((curttyb.cbrkflgs & CBRKMASK) != cf){
                curttyb.cbrkflgs &= ~CBRKMASK;
                curttyb.cbrkflgs |= cf;
#ifdef USG
                /* be satisfied with one character; no timeout */
                curttyb.c_cc[VMIN] = 1;         /* was VEOF */
                curttyb.c_cc[VTIME] = 0;        /* was VEOL */
#endif USG
                change++;
        }
        if(change){
                setctty();
        }
        start_screen();
}


/* fatal error */
/*VARARGS1*/
error(s,x,y) char *s; {
        if(settty_needed)
                settty((char *) 0);
        printf(s,x,y);
        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".
 */
getlin(bufp)
register char *bufp;
{
        register char *obufp = bufp;
        register 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  bell();
                } 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
                        bell();
        }
}

getret() {
        cgetret("");
}

cgetret(s)
register 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 */

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

        morc = 0;

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

char *
parse()
{
        static char inputline[COLNO];
        register 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() {
        register int sym;

        (void) fflush(stdout);
        if((sym = getchar()) == EOF)
#ifdef NR_OF_EOFS
        { /*
           * Some SYSV systems seem to return EOFs for various reasons
           * (?like when one hits break or for interrupted systemcalls?),
           * and we must see several before we quit.
           */
                register int cnt = NR_OF_EOFS;
                while (cnt--) {
                    clearerr(stdin);    /* omit if clearerr is undefined */
                    if((sym = getchar()) != EOF) goto noteof;
                }
                end_of_input();
             noteof:    ;
        }
#else
                end_of_input();
#endif NR_OF_EOFS
        if(flags.toplin == 1)
                flags.toplin = 2;
        return((char) sym);
}

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