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1 | /* Copyright (C) 1993-2019 Free Software Foundation, Inc. | |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
15 | License along with the GNU C Library; if not, see | |
16 | <https://www.gnu.org/licenses/>. | |
17 | ||
18 | As a special exception, if you link the code in this file with | |
19 | files compiled with a GNU compiler to produce an executable, | |
20 | that does not cause the resulting executable to be covered by | |
21 | the GNU Lesser General Public License. This exception does not | |
22 | however invalidate any other reasons why the executable file | |
23 | might be covered by the GNU Lesser General Public License. | |
24 | This exception applies to code released by its copyright holders | |
25 | in files containing the exception. */ | |
26 | ||
27 | /* | |
28 | Copyright (C) 1990 The Regents of the University of California. | |
29 | All rights reserved. | |
30 | ||
31 | Redistribution and use in source and binary forms, with or without | |
32 | modification, are permitted provided that the following conditions | |
33 | are met: | |
34 | ||
35 | 1. Redistributions of source code must retain the above copyright | |
36 | notice, this list of conditions and the following disclaimer. | |
37 | 2. Redistributions in binary form must reproduce the above copyright | |
38 | notice, this list of conditions and the following disclaimer in the | |
39 | documentation and/or other materials provided with the distribution. | |
40 | 4. Neither the name of the University nor the names of its contributors | |
41 | may be used to endorse or promote products derived from this software | |
42 | without specific prior written permission. | |
43 | ||
44 | THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
45 | ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
46 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
47 | ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
48 | FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
49 | DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
50 | OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
51 | HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
52 | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
53 | OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
54 | SUCH DAMAGE.*/ | |
55 | ||
56 | /* Modified for GNU iostream by Per Bothner 1991, 1992. */ | |
57 | ||
58 | #include "libioP.h" | |
59 | #include <stdlib.h> | |
60 | ||
61 | /* Allocate a file buffer, or switch to unbuffered I/O. */ | |
62 | int | |
63 | _IO_wfile_doallocate (FILE *fp) | |
64 | { | |
65 | size_t size; | |
66 | wchar_t *p; | |
67 | ||
68 | /* Allocate room for the external buffer. */ | |
69 | if (fp->_IO_buf_base == NULL) | |
70 | _IO_file_doallocate (fp); | |
71 | ||
72 | /* If narrow buffer is user allocated (set by setvbuf etc.), | |
73 | use that size as the size of the wide buffer, when it is | |
74 | allocated by _IO_file_doallocate, multiply that by size | |
75 | of the wide character. */ | |
76 | size = fp->_IO_buf_end - fp->_IO_buf_base; | |
77 | if ((fp->_flags & _IO_USER_BUF)) | |
78 | size = (size + sizeof (wchar_t) - 1) / sizeof (wchar_t); | |
79 | p = malloc (size * sizeof (wchar_t)); | |
80 | if (__glibc_unlikely (p == NULL)) | |
81 | return EOF; | |
82 | _IO_wsetb (fp, p, p + size, 1); | |
83 | return 1; | |
84 | } |