mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-11-29 00:12:45 +00:00
a5f0fb151d
distributed under your choice of the GPL or a BSD style license. Reviewed by: peter Obtained from: http://home.flash.net/~marknu/less/
162 lines
3.1 KiB
C
162 lines
3.1 KiB
C
/*
|
|
* Copyright (C) 1984-2000 Mark Nudelman
|
|
*
|
|
* You may distribute under the terms of either the GNU General Public
|
|
* License or the Less License, as specified in the README file.
|
|
*
|
|
* For more information about less, or for information on how to
|
|
* contact the author, see the README file.
|
|
*/
|
|
|
|
|
|
/*
|
|
* Routines dealing with getting input from the keyboard (i.e. from the user).
|
|
*/
|
|
|
|
#include "less.h"
|
|
#if MSDOS_COMPILER==WIN32C
|
|
#include "windows.h"
|
|
extern char WIN32getch();
|
|
static DWORD console_mode;
|
|
#endif
|
|
|
|
static int tty;
|
|
extern int sigs;
|
|
|
|
/*
|
|
* Open keyboard for input.
|
|
*/
|
|
public void
|
|
open_getchr()
|
|
{
|
|
#if MSDOS_COMPILER==WIN32C
|
|
/* Need this to let child processes inherit our console handle */
|
|
SECURITY_ATTRIBUTES sa;
|
|
memset(&sa, 0, sizeof(SECURITY_ATTRIBUTES));
|
|
sa.nLength = sizeof(SECURITY_ATTRIBUTES);
|
|
sa.bInheritHandle = TRUE;
|
|
tty = (int) CreateFile("CONIN$", GENERIC_READ,
|
|
FILE_SHARE_READ, &sa,
|
|
OPEN_EXISTING, 0L, NULL);
|
|
GetConsoleMode((HANDLE)tty, &console_mode);
|
|
/* Make sure we get Ctrl+C events. */
|
|
SetConsoleMode((HANDLE)tty, ENABLE_PROCESSED_INPUT);
|
|
#else
|
|
#if MSDOS_COMPILER || OS2
|
|
extern int fd0;
|
|
/*
|
|
* Open a new handle to CON: in binary mode
|
|
* for unbuffered keyboard read.
|
|
*/
|
|
fd0 = dup(0);
|
|
close(0);
|
|
tty = open("CON", OPEN_READ);
|
|
#if MSDOS_COMPILER==DJGPPC
|
|
/*
|
|
* Setting stdin to binary causes Ctrl-C to not
|
|
* raise SIGINT. We must undo that side-effect.
|
|
*/
|
|
(void) __djgpp_set_ctrl_c(1);
|
|
#endif
|
|
#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("/dev/tty", OPEN_READ);
|
|
if (tty < 0)
|
|
tty = 2;
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Close the keyboard.
|
|
*/
|
|
public void
|
|
close_getchr()
|
|
{
|
|
#if MSDOS_COMPILER==WIN32C
|
|
SetConsoleMode((HANDLE)tty, console_mode);
|
|
CloseHandle((HANDLE)tty);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Get a character from the keyboard.
|
|
*/
|
|
public int
|
|
getchr()
|
|
{
|
|
char c;
|
|
int result;
|
|
|
|
do
|
|
{
|
|
#if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC
|
|
/*
|
|
* In raw read, we don't see ^C so look here for it.
|
|
*/
|
|
flush();
|
|
#if MSDOS_COMPILER==WIN32C
|
|
if (ABORT_SIGS())
|
|
return (READ_INTR);
|
|
c = WIN32getch(tty);
|
|
#else
|
|
c = getch();
|
|
#endif
|
|
result = 1;
|
|
if (c == '\003')
|
|
return (READ_INTR);
|
|
#else
|
|
#if OS2
|
|
{
|
|
static int scan = -1;
|
|
flush();
|
|
if (scan >= 0)
|
|
{
|
|
c = scan;
|
|
scan = -1;
|
|
} else
|
|
{
|
|
if ((c = _read_kbd(0, 1, 0)) == -1)
|
|
return (READ_INTR);
|
|
if (c == '\0')
|
|
{
|
|
/*
|
|
* Zero is usually followed by another byte,
|
|
* since certain keys send two bytes.
|
|
*/
|
|
scan = _read_kbd(0, 0, 0);
|
|
}
|
|
}
|
|
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);
|
|
}
|