/*      $NetBSD: set.c,v 1.18 2015/06/21 08:23:22 mlelstv Exp $ */

/*-
* Copyright (c) 1991, 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.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: set.c,v 1.18 2015/06/21 08:23:22 mlelstv Exp $");

#include <err.h>
#include <stdio.h>
#include <term.h>
#include <termios.h>
#include <unistd.h>
#include "extern.h"

#define CHK(val, dft)   (val <= 0 ? dft : val)

static int      set_tabs(void);

/*
* Reset the terminal mode bits to a sensible state.  Very useful after
* a child program dies in raw mode.
*/
void
reset_mode(void)
{
       tcgetattr(STDERR_FILENO, &mode);

#if defined(VDISCARD) && defined(CDISCARD)
       mode.c_cc[VDISCARD] = CHK(mode.c_cc[VDISCARD], CDISCARD);
#endif
       mode.c_cc[VEOF] = CHK(mode.c_cc[VEOF], CEOF);
       mode.c_cc[VERASE] = CHK(mode.c_cc[VERASE], CERASE);
#if defined(VFLUSH) && defined(CFLUSH)
       mode.c_cc[VFLUSH] = CHK(mode.c_cc[VFLUSH], CFLUSH);
#endif
       mode.c_cc[VINTR] = CHK(mode.c_cc[VINTR], CINTR);
       mode.c_cc[VKILL] = CHK(mode.c_cc[VKILL], CKILL);
#if defined(VLNEXT) && defined(CLNEXT)
       mode.c_cc[VLNEXT] = CHK(mode.c_cc[VLNEXT], CLNEXT);
#endif
       mode.c_cc[VQUIT] = CHK(mode.c_cc[VQUIT], CQUIT);
#if defined(VREPRINT) && defined(CRPRNT)
       mode.c_cc[VREPRINT] = CHK(mode.c_cc[VREPRINT], CRPRNT);
#endif
       mode.c_cc[VSTART] = CHK(mode.c_cc[VSTART], CSTART);
       mode.c_cc[VSTOP] = CHK(mode.c_cc[VSTOP], CSTOP);
       mode.c_cc[VSUSP] = CHK(mode.c_cc[VSUSP], CSUSP);
#if defined(VWERASE) && defined(CWERASE)
       mode.c_cc[VWERASE] = CHK(mode.c_cc[VWERASE], CWERASE);
#endif

       mode.c_iflag &= ~(IGNBRK | PARMRK | INPCK | ISTRIP | INLCR | IGNCR
#ifdef IUCLC
                         | IUCLC
#endif
#ifdef IXANY
                         | IXANY
#endif
                         | IXOFF);

       mode.c_iflag |= (BRKINT | IGNPAR | ICRNL | IXON
#ifdef IMAXBEL
                        | IMAXBEL
#endif
                        );

       mode.c_oflag &= ~(0
#ifdef OLCUC
                         | OLCUC
#endif
#ifdef OCRNL
                         | OCRNL
#endif
#ifdef ONOCR
                         | ONOCR
#endif
#ifdef ONLRET
                         | ONLRET
#endif
#ifdef OFILL
                         | OFILL
#endif
#ifdef OFDEL
                         | OFDEL
#endif
#ifdef NLDLY
                         | NLDLY | CRDLY | TABDLY | BSDLY | VTDLY | FFDLY
#endif
                         );

       mode.c_oflag |= (OPOST
#ifdef ONLCR
                        | ONLCR
#endif
                        );

       mode.c_cflag &= ~(CSIZE | CSTOPB | PARENB | PARODD);
       mode.c_cflag |= (CS8 | CREAD);
       mode.c_lflag &= ~(ECHONL | NOFLSH | TOSTOP
#ifdef ECHOPTR
                         | ECHOPRT
#endif
#ifdef XCASE
                         | XCASE
#endif
                         );

       mode.c_lflag |= (ISIG | ICANON | ECHO | ECHOE | ECHOK
#ifdef ECHOCTL
                        | ECHOCTL
#endif
#ifdef ECHOKE
                        | ECHOKE
#endif
                        );

       tcsetattr(STDERR_FILENO, TCSADRAIN, &mode);
}

/*
* Determine the erase, interrupt, and kill characters from the terminfo
* entry and command line and update their values in 'mode'.
*/
void
set_control_chars(int erasechar, int intrchar, int killchar)
{
       int bs_char;

       if (key_backspace != NULL && key_backspace[1] == '\0')
               bs_char = key_backspace[0];
       else
               bs_char = 0;

       if (erasechar == 0 && bs_char != 0 && !over_strike)
               erasechar = -1;
       if (erasechar < 0)
               erasechar = (bs_char != 0) ? bs_char : CTRL('h');

       if (mode.c_cc[VERASE] == 0 || erasechar != 0)
                mode.c_cc[VERASE] = erasechar ? erasechar : CERASE;

       if (mode.c_cc[VINTR] == 0 || intrchar != 0)
                mode.c_cc[VINTR] = intrchar ? intrchar : CINTR;

       if (mode.c_cc[VKILL] == 0 || killchar != 0)
               mode.c_cc[VKILL] = killchar ? killchar : CKILL;
}

/*
* Set up various conversions in 'mode', including parity, tabs, returns,
* echo, and case, according to the terminfo entry.  If the program we're
* running was named with a leading upper-case character, map external
* uppercase to internal lowercase.
*/
void
set_conversions(int usingupper)
{

#ifdef ONLCR
       mode.c_oflag |= ONLCR;
#endif
       mode.c_iflag |= ICRNL;
       mode.c_lflag |= ECHO;
       mode.c_oflag |= OXTABS;
       if (newline != NULL && newline[0] == '\n' && !newline[1]) {                     /* Newline, not linefeed. */
#ifdef ONLCR
               mode.c_oflag &= ~ONLCR;
#endif
               mode.c_iflag &= ~ICRNL;
       }
       if (tab)        /* Print tabs. */
               mode.c_oflag &= ~OXTABS;
       mode.c_lflag |= (ECHOE | ECHOK);
}

/* Output startup string. */
void
set_init(void)
{
       const char *bp;
       int settle;

#ifdef TAB3
       if (oldmode.c_oflag & (TAB3 | ONLCR | OCRNL | ONLRET)) {
               oldmode.c_oflag &= (TAB3 | ONLCR | OCRNL | ONLRET);
               tcsetattr(STDERR_FILENO, TCSADRAIN, &oldmode);
       }
#endif
       settle = set_tabs();

       if (isreset) {
               if (reset_1string) {
                       tputs(reset_1string, 0, outc);
                       settle = 1;
               }
               if (reset_2string) {
                       tputs(reset_2string, 0, outc);
                       settle = 1;
               }
               if ((bp = reset_file) || (bp = init_file)) {
                       tset_cat(bp);
                       settle = 1;
               }
       }

       if (settle) {
               (void)putc('\r', stderr);
               (void)fflush(stderr);
               (void)sleep(1);                 /* Settle the terminal. */
       }
}

/*
* Set the hardware tabs on the terminal, using the ct (clear all tabs),
* st (set one tab) and ch (horizontal cursor addressing) capabilities.
* This is done before if and is, so they can patch in case we blow this.
* Return nonzero if we set any tab stops, zero if not.
*/
static int
set_tabs(void)
{
       int c;
       char *out;

       if (set_tab) {
               if (clear_all_tabs) {
                       (void)putc('\r', stderr);   /* Force to left margin. */
                       tputs(clear_all_tabs, 0, outc);
               }

               for (c = 8; c < ncolumns; c += 8) {
                       if (column_address)
                               out = tiparm(column_address, c);
                       else
                               out = NULL;
                       if (out)
                               tputs(out, 1, outc);
                       else
                               (void)fprintf(stderr, "%s", "        ");
                       /* Set the tab. */
                       tputs(set_tab, 0, outc);
               }
               putc('\r', stderr);
               return (1);
       }
       return (0);
}

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