1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate * Copyright 1988 Sun Microsystems, Inc. All rights reserved.
24*0Sstevel@tonic-gate * Use is subject to license terms.
25*0Sstevel@tonic-gate */
26*0Sstevel@tonic-gate
27*0Sstevel@tonic-gate /* Copyright (c) 1984 AT&T */
28*0Sstevel@tonic-gate /* All Rights Reserved */
29*0Sstevel@tonic-gate
30*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 2.1 */
31*0Sstevel@tonic-gate
32*0Sstevel@tonic-gate /*LINTLIBRARY*/
33*0Sstevel@tonic-gate #include <stdio.h>
34*0Sstevel@tonic-gate
35*0Sstevel@tonic-gate int
ungetc(c,iop)36*0Sstevel@tonic-gate ungetc(c, iop)
37*0Sstevel@tonic-gate int c;
38*0Sstevel@tonic-gate register FILE *iop;
39*0Sstevel@tonic-gate {
40*0Sstevel@tonic-gate if(c == EOF)
41*0Sstevel@tonic-gate return(EOF);
42*0Sstevel@tonic-gate if((iop->_flag & (_IOREAD|_IORW)) == 0)
43*0Sstevel@tonic-gate return(EOF);
44*0Sstevel@tonic-gate
45*0Sstevel@tonic-gate if (iop->_base == NULL) /* get buffer if we don't have one */
46*0Sstevel@tonic-gate _findbuf(iop);
47*0Sstevel@tonic-gate
48*0Sstevel@tonic-gate if((iop->_flag & _IOREAD) == 0 || iop->_ptr <= iop->_base)
49*0Sstevel@tonic-gate if(iop->_ptr == iop->_base && iop->_cnt == 0)
50*0Sstevel@tonic-gate ++iop->_ptr;
51*0Sstevel@tonic-gate else
52*0Sstevel@tonic-gate return(EOF);
53*0Sstevel@tonic-gate if (*--iop->_ptr != c) *iop->_ptr = c; /* was *--iop->_ptr = c; */
54*0Sstevel@tonic-gate ++iop->_cnt;
55*0Sstevel@tonic-gate return(c);
56*0Sstevel@tonic-gate }
57