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Annotation of src/usr.bin/more/ttyin.c, Revision 1.1.1.1

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: }