1/* Copyright (C) 1995-2023 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#include "libioP.h"
19#include "strfile.h"
20#include <stdio.h>
21#include <stdlib.h>
22#include <wchar.h>
23
24
25struct _IO_FILE_wmemstream
26{
27 _IO_strfile _sf;
28 wchar_t **bufloc;
29 size_t *sizeloc;
30};
31
32
33/* Open a stream that writes into a malloc'd buffer that is expanded as
34 necessary. *BUFLOC and *SIZELOC are updated with the buffer's location
35 and the number of characters written on fflush or fclose. */
36FILE *
37open_wmemstream (wchar_t **bufloc, size_t *sizeloc)
38{
39 struct locked_FILE
40 {
41 struct _IO_FILE_wmemstream fp;
42#ifdef _IO_MTSAFE_IO
43 _IO_lock_t lock;
44#endif
45 struct _IO_wide_data wd;
46 } *new_f;
47 wchar_t *buf;
48
49 new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
50 if (new_f == NULL)
51 return NULL;
52#ifdef _IO_MTSAFE_IO
53 new_f->fp._sf._sbf._f._lock = &new_f->lock;
54#endif
55
56 buf = calloc (1, BUFSIZ);
57 if (buf == NULL)
58 {
59 free (new_f);
60 return NULL;
61 }
62 _IO_no_init (&new_f->fp._sf._sbf._f, 0, 0, &new_f->wd, &_IO_wmem_jumps);
63 _IO_fwide (&new_f->fp._sf._sbf._f, 1);
64 _IO_wstr_init_static (&new_f->fp._sf._sbf._f, buf,
65 BUFSIZ / sizeof (wchar_t), buf);
66 new_f->fp._sf._sbf._f._flags2 &= ~_IO_FLAGS2_USER_WBUF;
67 new_f->fp._sf._s._allocate_buffer_unused = (_IO_alloc_type) malloc;
68 new_f->fp._sf._s._free_buffer_unused = (_IO_free_type) free;
69
70 new_f->fp.bufloc = bufloc;
71 new_f->fp.sizeloc = sizeloc;
72
73 /* Disable single thread optimization. BZ 21735. */
74 new_f->fp._sf._sbf._f._flags2 |= _IO_FLAGS2_NEED_LOCK;
75
76 return (FILE *) &new_f->fp._sf._sbf;
77}
78
79
80int
81_IO_wmem_sync (FILE *fp)
82{
83 struct _IO_FILE_wmemstream *mp = (struct _IO_FILE_wmemstream *) fp;
84
85 if (fp->_wide_data->_IO_write_ptr == fp->_wide_data->_IO_write_end)
86 {
87 _IO_wstr_overflow (fp, '\0');
88 --fp->_wide_data->_IO_write_ptr;
89 }
90
91 *mp->bufloc = fp->_wide_data->_IO_write_base;
92 *mp->sizeloc = (fp->_wide_data->_IO_write_ptr
93 - fp->_wide_data->_IO_write_base);
94
95 return 0;
96}
97
98
99void
100_IO_wmem_finish (FILE *fp, int dummy)
101{
102 struct _IO_FILE_wmemstream *mp = (struct _IO_FILE_wmemstream *) fp;
103
104 *mp->bufloc = (wchar_t *) realloc (fp->_wide_data->_IO_write_base,
105 (fp->_wide_data->_IO_write_ptr
106 - fp->_wide_data->_IO_write_base + 1)
107 * sizeof (wchar_t));
108 if (*mp->bufloc != NULL)
109 {
110 size_t len = (fp->_wide_data->_IO_write_ptr
111 - fp->_wide_data->_IO_write_base);
112 (*mp->bufloc)[len] = '\0';
113 *mp->sizeloc = len;
114
115 fp->_wide_data->_IO_buf_base = NULL;
116 }
117
118 _IO_wstr_finish (fp, 0);
119}
120