1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1986 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * Copyright 2010 Nexenta Systems, Inc. All rights reserved. 32 */ 33 34 /* This module is created for NLS on Sep.03.86 */ 35 36 /* 37 * Ungetwc saves the process code c into the one character buffer 38 * associated with an input stream "iop". That character, c, 39 * will be returned by the next getwc call on that stream. 40 */ 41 42 #include "lint.h" 43 #include "file64.h" 44 #include "mse_int.h" 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <widec.h> 48 #include <limits.h> 49 #include <errno.h> 50 #include "libc.h" 51 #include "stdiom.h" 52 #include "mse.h" 53 54 static wint_t 55 __ungetwc_impl(wint_t wc, FILE *iop, int orient) 56 { 57 char mbs[MB_LEN_MAX]; 58 unsigned char *p; 59 int n; 60 rmutex_t *lk; 61 62 FLOCKFILE(lk, iop); 63 64 if (orient && GET_NO_MODE(iop)) { 65 _setorientation(iop, _WC_MODE); 66 } 67 if ((wc == WEOF) || ((iop->_flag & _IOREAD) == 0)) { 68 FUNLOCKFILE(lk); 69 return (WEOF); 70 } 71 72 n = wctomb(mbs, (wchar_t)wc); 73 if (n <= 0) { 74 FUNLOCKFILE(lk); 75 return (WEOF); 76 } 77 78 if (iop->_ptr <= iop->_base) { 79 if (iop->_base == NULL) { 80 FUNLOCKFILE(lk); 81 return (WEOF); 82 } 83 if (iop->_ptr == iop->_base && iop->_cnt == 0) { 84 ++iop->_ptr; 85 } else if ((iop->_ptr - n) < (iop->_base - PUSHBACK)) { 86 FUNLOCKFILE(lk); 87 return (WEOF); 88 } 89 } 90 91 p = (unsigned char *)(mbs + n - 1); 92 while (n--) { 93 *--(iop)->_ptr = (*p--); 94 ++(iop)->_cnt; 95 } 96 iop->_flag &= ~_IOEOF; 97 FUNLOCKFILE(lk); 98 return (wc); 99 } 100 101 102 wint_t 103 __ungetwc_xpg5(wint_t wc, FILE *iop) 104 { 105 return (__ungetwc_impl(wc, iop, 1)); 106 } 107 108 wint_t 109 ungetwc(wint_t wc, FILE *iop) 110 { 111 return (__ungetwc_impl(wc, iop, 0)); 112 } 113