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 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /* Copyright (c) 1986 AT&T */
30 /* All Rights Reserved */
31
32
33 /* This module is created for NLS on Sep.03.86 */
34
35 /*
36 * Ungetwc saves the process code c into the one character buffer
37 * associated with an input stream "iop". That character, c,
38 * will be returned by the next getwc call on that stream.
39 */
40
41 #include "lint.h"
42 #include "file64.h"
43 #include "mse_int.h"
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <widec.h>
47 #include <limits.h>
48 #include <errno.h>
49 #include "libc.h"
50 #include "stdiom.h"
51 #include "mse.h"
52
53 wint_t
__ungetwc_xpg5(wint_t wc,FILE * iop)54 __ungetwc_xpg5(wint_t wc, FILE *iop)
55 {
56 char mbs[MB_LEN_MAX];
57 unsigned char *p;
58 int n;
59 void *lc;
60 int (*fp_wctomb)(void *, char *, wchar_t);
61 rmutex_t *lk;
62
63 FLOCKFILE(lk, iop);
64
65 if (_set_orientation_wide(iop, &lc,
66 (void (*(*))(void))&fp_wctomb, FP_WCTOMB) == -1) {
67 errno = EBADF;
68 FUNLOCKFILE(lk);
69 return (WEOF);
70 }
71
72 if ((wc == WEOF) || ((iop->_flag & _IOREAD) == 0)) {
73 FUNLOCKFILE(lk);
74 return (WEOF);
75 }
76
77 n = fp_wctomb(lc, mbs, (wchar_t)wc);
78 if (n <= 0) {
79 FUNLOCKFILE(lk);
80 return (WEOF);
81 }
82
83 if (iop->_ptr <= iop->_base) {
84 if (iop->_base == NULL) {
85 FUNLOCKFILE(lk);
86 return (WEOF);
87 }
88 if (iop->_ptr == iop->_base && iop->_cnt == 0) {
89 ++iop->_ptr;
90 } else if ((iop->_ptr - n) < (iop->_base - PUSHBACK)) {
91 FUNLOCKFILE(lk);
92 return (WEOF);
93 }
94 }
95
96 p = (unsigned char *)(mbs + n - 1);
97 while (n--) {
98 *--(iop)->_ptr = (*p--);
99 ++(iop)->_cnt;
100 }
101 iop->_flag &= ~_IOEOF;
102 FUNLOCKFILE(lk);
103 return (wc);
104 }
105