182 lines
3.4 KiB
C
182 lines
3.4 KiB
C
/*
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* Copyright (C) 1984-2017 Mark Nudelman
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Less License, as specified in the README file.
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*
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* For more information, see the README file.
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*/
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/*
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* Routines dealing with getting input from the keyboard (i.e. from the user).
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*/
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#include "less.h"
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#if OS2
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#include "cmd.h"
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#include "pckeys.h"
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#endif
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#if MSDOS_COMPILER==WIN32C
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#include "windows.h"
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extern char WIN32getch();
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static DWORD console_mode;
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#endif
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public int tty;
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extern int sigs;
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extern int utf_mode;
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/*
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* Open keyboard for input.
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*/
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public void
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open_getchr()
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{
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#if MSDOS_COMPILER==WIN32C
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/* Need this to let child processes inherit our console handle */
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SECURITY_ATTRIBUTES sa;
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memset(&sa, 0, sizeof(SECURITY_ATTRIBUTES));
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sa.nLength = sizeof(SECURITY_ATTRIBUTES);
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sa.bInheritHandle = TRUE;
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tty = (int) CreateFile("CONIN$", GENERIC_READ,
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FILE_SHARE_READ, &sa,
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OPEN_EXISTING, 0L, NULL);
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GetConsoleMode((HANDLE)tty, &console_mode);
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/* Make sure we get Ctrl+C events. */
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SetConsoleMode((HANDLE)tty, ENABLE_PROCESSED_INPUT);
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#else
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#if MSDOS_COMPILER
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extern int fd0;
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/*
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* Open a new handle to CON: in binary mode
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* for unbuffered keyboard read.
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*/
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fd0 = dup(0);
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close(0);
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tty = open("CON", OPEN_READ);
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#if MSDOS_COMPILER==DJGPPC
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/*
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* Setting stdin to binary causes Ctrl-C to not
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* raise SIGINT. We must undo that side-effect.
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*/
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(void) __djgpp_set_ctrl_c(1);
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#endif
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#else
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/*
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* Try /dev/tty.
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* If that doesn't work, use file descriptor 2,
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* which in Unix is usually attached to the screen,
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* but also usually lets you read from the keyboard.
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*/
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#if OS2
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/* The __open() system call translates "/dev/tty" to "con". */
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tty = __open("/dev/tty", OPEN_READ);
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#else
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tty = open("/dev/tty", OPEN_READ);
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#endif
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if (tty < 0)
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tty = 2;
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#endif
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#endif
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}
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/*
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* Close the keyboard.
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*/
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public void
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close_getchr()
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{
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#if MSDOS_COMPILER==WIN32C
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SetConsoleMode((HANDLE)tty, console_mode);
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CloseHandle((HANDLE)tty);
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#endif
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}
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/*
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* Get a character from the keyboard.
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*/
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public int
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getchr()
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{
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char c;
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int result;
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do
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{
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#if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC
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/*
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* In raw read, we don't see ^C so look here for it.
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*/
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flush();
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#if MSDOS_COMPILER==WIN32C
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if (ABORT_SIGS())
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return (READ_INTR);
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c = WIN32getch(tty);
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#else
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c = getch();
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#endif
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result = 1;
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if (c == '\003')
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return (READ_INTR);
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#else
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{
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unsigned char uc;
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result = iread(tty, &uc, sizeof(char));
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c = (char) uc;
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}
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if (result == READ_INTR)
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return (READ_INTR);
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if (result < 0)
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{
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/*
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* Don't call error() here,
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* because error calls getchr!
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*/
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quit(QUIT_ERROR);
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}
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#endif
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#if 0 /* allow entering arbitrary hex chars for testing */
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/* ctrl-A followed by two hex chars makes a byte */
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{
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static int hex_in = 0;
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static int hex_value = 0;
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if (c == CONTROL('A'))
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{
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hex_in = 2;
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result = 0;
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continue;
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}
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if (hex_in > 0)
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{
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int v;
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if (c >= '0' && c <= '9')
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v = c - '0';
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else if (c >= 'a' && c <= 'f')
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v = c - 'a' + 10;
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else if (c >= 'A' && c <= 'F')
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v = c - 'A' + 10;
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else
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hex_in = 0;
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hex_value = (hex_value << 4) | v;
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if (--hex_in > 0)
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{
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result = 0;
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continue;
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}
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c = hex_value;
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}
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}
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#endif
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/*
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* Various parts of the program cannot handle
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* an input character of '\0'.
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* If a '\0' was actually typed, convert it to '\340' here.
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*/
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if (c == '\0')
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c = '\340';
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} while (result != 1);
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return (c & 0xFF);
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}
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