Annotation of src/usr.bin/more/ttyin.c, Revision 1.1
1.1 ! deraadt 1: /*
! 2: * Copyright (c) 1988 Mark Nudleman
! 3: * Copyright (c) 1988 Regents of the University of California.
! 4: * All rights reserved.
! 5: *
! 6: * Redistribution and use in source and binary forms, with or without
! 7: * modification, are permitted provided that the following conditions
! 8: * are met:
! 9: * 1. Redistributions of source code must retain the above copyright
! 10: * notice, this list of conditions and the following disclaimer.
! 11: * 2. Redistributions in binary form must reproduce the above copyright
! 12: * notice, this list of conditions and the following disclaimer in the
! 13: * documentation and/or other materials provided with the distribution.
! 14: * 3. All advertising materials mentioning features or use of this software
! 15: * must display the following acknowledgement:
! 16: * This product includes software developed by the University of
! 17: * California, Berkeley and its contributors.
! 18: * 4. Neither the name of the University nor the names of its contributors
! 19: * may be used to endorse or promote products derived from this software
! 20: * without specific prior written permission.
! 21: *
! 22: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 23: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 24: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 25: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 26: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 27: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 28: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 29: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 30: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 31: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 32: * SUCH DAMAGE.
! 33: */
! 34:
! 35: #ifndef lint
! 36: /* from: static char sccsid[] = "@(#)ttyin.c 5.4 (Berkeley) 6/1/90"; */
! 37: static char *rcsid = "$Id: ttyin.c,v 1.2 1993/11/09 05:14:05 cgd Exp $";
! 38: #endif /* not lint */
! 39:
! 40: /*
! 41: * Routines dealing with getting input from the keyboard (i.e. from the user).
! 42: */
! 43:
! 44: #include <less.h>
! 45:
! 46: static int tty;
! 47:
! 48: /*
! 49: * Open keyboard for input.
! 50: * (Just use file descriptor 2.)
! 51: */
! 52: open_getchr()
! 53: {
! 54: tty = 2;
! 55: }
! 56:
! 57: /*
! 58: * Get a character from the keyboard.
! 59: */
! 60: getchr()
! 61: {
! 62: char c;
! 63: int result;
! 64:
! 65: do
! 66: {
! 67: result = iread(tty, &c, 1);
! 68: if (result == READ_INTR)
! 69: return (READ_INTR);
! 70: if (result < 0)
! 71: {
! 72: /*
! 73: * Don't call error() here,
! 74: * because error calls getchr!
! 75: */
! 76: quit();
! 77: }
! 78: } while (result != 1);
! 79: return (c & 0177);
! 80: }