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/*
* Copyright (c) 1984,1985,1989,1994,1995 Mark Nudelman
* 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 in the documentation and/or other materials provided with
* the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
*/
/*
* Routines dealing with getting input from the keyboard (i.e. from the user).
*/
#include "less.h"
static int tty;
/*
* Open keyboard for input.
*/
public void
open_getchr()
{
#if MSOFTC || OS2
extern int fd0;
/*
* Open a new handle to CON: in binary mode
* for unbuffered keyboard read.
*/
fd0 = dup(0);
close(0);
tty = OPEN_TTYIN();
#else
/*
* Try /dev/tty.
* If that doesn't work, use file descriptor 2,
* which in Unix is usually attached to the screen,
* but also usually lets you read from the keyboard.
*/
tty = OPEN_TTYIN();
if (tty < 0)
tty = 2;
#endif
}
/*
* Get a character from the keyboard.
*/
public int
getchr()
{
char c;
int result;
do
{
#if MSOFTC
/*
* In raw read, we don't see ^C so look here for it.
*/
flush();
c = getch();
result = 1;
if (c == '\003')
return (READ_INTR);
#else
#if OS2
flush();
while (_read_kbd(0, 0, 0) != -1)
continue;
if ((c = _read_kbd(0, 1, 0)) == -1)
return (READ_INTR);
result = 1;
#else
result = iread(tty, &c, sizeof(char));
if (result == READ_INTR)
return (READ_INTR);
if (result < 0)
{
/*
* Don't call error() here,
* because error calls getchr!
*/
quit(QUIT_ERROR);
}
#endif
#endif
/*
* Various parts of the program cannot handle
* an input character of '\0'.
* If a '\0' was actually typed, convert it to '\340' here.
*/
if (c == '\0')
c = '\340';
} while (result != 1);
return (c & 0377);
}
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