summary refs log tree commit diff
path: root/libio/memstream.c
blob: 840d0e6968cd3d70490b3b7e9808738f9c40bb29 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
/* Copyright (C) 1995, 1996, 1997, 1999 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "libioP.h"
#include "strfile.h"
#include <stdio.h>
#include <stdlib.h>


struct _IO_FILE_memstream
{
  _IO_strfile _sf;
  char **bufloc;
  _IO_size_t *sizeloc;
};


static int _IO_mem_sync __P ((_IO_FILE* fp));
static void _IO_mem_finish __P ((_IO_FILE* fp, int));
static int _IO_wmem_sync __P ((_IO_FILE* fp));
static void _IO_wmem_finish __P ((_IO_FILE* fp, int));


static struct _IO_jump_t _IO_mem_jumps =
{
  JUMP_INIT_DUMMY,
  JUMP_INIT (finish, _IO_mem_finish),
  JUMP_INIT (overflow, _IO_str_overflow),
  JUMP_INIT (underflow, _IO_str_underflow),
  JUMP_INIT (uflow, _IO_default_uflow),
  JUMP_INIT (pbackfail, _IO_str_pbackfail),
  JUMP_INIT (xsputn, _IO_default_xsputn),
  JUMP_INIT (xsgetn, _IO_default_xsgetn),
  JUMP_INIT (seekoff, _IO_str_seekoff),
  JUMP_INIT (seekpos, _IO_default_seekpos),
  JUMP_INIT (setbuf, _IO_default_setbuf),
  JUMP_INIT (sync, _IO_mem_sync),
  JUMP_INIT (doallocate, _IO_default_doallocate),
  JUMP_INIT (read, _IO_default_read),
  JUMP_INIT (write, _IO_default_write),
  JUMP_INIT (seek, _IO_default_seek),
  JUMP_INIT (close, _IO_default_close),
  JUMP_INIT (stat, _IO_default_stat),
  JUMP_INIT(showmanyc, _IO_default_showmanyc),
  JUMP_INIT(imbue, _IO_default_imbue)
};

static struct _IO_jump_t _IO_wmem_jumps =
{
  JUMP_INIT_DUMMY,
  JUMP_INIT (finish, (_IO_finish_t) _IO_wmem_finish),
  JUMP_INIT (overflow, (_IO_overflow_t) _IO_wstr_overflow),
  JUMP_INIT (underflow, (_IO_underflow_t) _IO_wstr_underflow),
  JUMP_INIT (uflow, (_IO_underflow_t) _IO_wdefault_uflow),
  JUMP_INIT (pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail),
  JUMP_INIT (xsputn, (_IO_xsputn_t) _IO_wdefault_xsputn),
  JUMP_INIT (xsgetn, (_IO_xsgetn_t) _IO_wdefault_xsgetn),
  JUMP_INIT (seekoff, _IO_wstr_seekoff),
  JUMP_INIT (seekpos, _IO_default_seekpos),
  JUMP_INIT (setbuf, (_IO_setbuf_t) _IO_wdefault_setbuf),
  JUMP_INIT (sync, (_IO_sync_t) _IO_wmem_sync),
  JUMP_INIT (doallocate, _IO_wdefault_doallocate),
  JUMP_INIT (read, _IO_default_read),
  JUMP_INIT (write, _IO_default_write),
  JUMP_INIT (seek, _IO_default_seek),
  JUMP_INIT (close, _IO_default_close),
  JUMP_INIT (stat, _IO_default_stat),
  JUMP_INIT(showmanyc, _IO_default_showmanyc),
  JUMP_INIT(imbue, _IO_default_imbue)
};

/* Open a stream that writes into a malloc'd buffer that is expanded as
   necessary.  *BUFLOC and *SIZELOC are updated with the buffer's location
   and the number of characters written on fflush or fclose.  */
_IO_FILE *
open_memstream (bufloc, sizeloc)
     char **bufloc;
     _IO_size_t *sizeloc;
{
  struct locked_FILE
  {
    struct _IO_FILE_memstream fp;
#ifdef _IO_MTSAFE_IO
    _IO_lock_t lock;
#endif
    struct _IO_wide_data wd;
  } *new_f;
  char *buf;

  new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
  if (new_f == NULL)
    return NULL;
#ifdef _IO_MTSAFE_IO
  new_f->fp._sf._sbf._f._lock = &new_f->lock;
#endif

  buf = malloc (_IO_BUFSIZ);
  if (buf == NULL)
    return NULL;
  _IO_no_init (&new_f->fp._sf._sbf._f, 0, 0, &new_f->wd, &_IO_wmem_jumps);
  _IO_JUMPS (&new_f->fp._sf._sbf._f) = &_IO_mem_jumps;
  _IO_str_init_static (&new_f->fp._sf._sbf._f, buf, _IO_BUFSIZ, buf);
  new_f->fp._sf._sbf._f._flags &= ~_IO_USER_BUF;
  new_f->fp._sf._s._allocate_buffer = (_IO_alloc_type) malloc;
  new_f->fp._sf._s._free_buffer = (_IO_free_type) free;

  new_f->fp.bufloc = bufloc;
  new_f->fp.sizeloc = sizeloc;

  return &new_f->fp._sf._sbf._f;
}


static int
_IO_mem_sync (fp)
     _IO_FILE* fp;
{
  struct _IO_FILE_memstream *mp = (struct _IO_FILE_memstream *) fp;
  int res;

  res = _IO_default_sync (fp);
  if (res < 0)
    return res;

  if (fp->_IO_write_ptr == fp->_IO_write_end)
    {
      _IO_str_overflow (fp, '\0');
      --fp->_IO_write_ptr;
    }
  else
    *fp->_IO_write_ptr = '\0';

  *mp->bufloc = fp->_IO_write_base;
  *mp->sizeloc = fp->_IO_write_ptr - fp->_IO_write_base;

  return 0;
}


static void
_IO_mem_finish (fp, dummy)
     _IO_FILE* fp;
     int dummy;
{
  struct _IO_FILE_memstream *mp = (struct _IO_FILE_memstream *) fp;

  *mp->bufloc = (char *) realloc (fp->_IO_write_base,
				  fp->_IO_write_ptr - fp->_IO_write_base + 1);
  if (*mp->bufloc != NULL)
    {
      (*mp->bufloc)[fp->_IO_write_ptr - fp->_IO_write_base] = '\0';
      *mp->sizeloc = fp->_IO_write_ptr - fp->_IO_write_base;
    }

  fp->_IO_buf_base = NULL;

  _IO_default_finish (fp, 0);
}


static int
_IO_wmem_sync (fp)
     _IO_FILE* fp;
{
  struct _IO_FILE_memstream *mp = (struct _IO_FILE_memstream *) fp;
  int res;

  res = _IO_default_sync (fp);
  if (res < 0)
    return res;

  if (fp->_wide_data->_IO_write_ptr == fp->_wide_data->_IO_write_end)
    {
      _IO_wstr_overflow (fp, L'\0');
      --fp->_wide_data->_IO_write_ptr;
    }
  else
    *fp->_wide_data->_IO_write_ptr = '\0';

  *mp->bufloc = (char *) fp->_wide_data->_IO_write_base;
  *mp->sizeloc = (fp->_wide_data->_IO_write_ptr
		  - fp->_wide_data->_IO_write_base);

  return 0;
}


static void
_IO_wmem_finish (fp, dummy)
     _IO_FILE* fp;
     int dummy;
{
  struct _IO_FILE_memstream *mp = (struct _IO_FILE_memstream *) fp;

  *mp->bufloc = (char *) realloc (fp->_wide_data->_IO_write_base,
				  (fp->_wide_data->_IO_write_ptr
				   - fp->_wide_data->_IO_write_base + 1)
				  * sizeof (wchar_t));
  if (*mp->bufloc != NULL)
    {
      ((wchar_t *) (*mp->bufloc))[fp->_wide_data->_IO_write_ptr
				 - fp->_wide_data->_IO_write_base] = '\0';
      *mp->sizeloc = (fp->_wide_data->_IO_write_ptr
		      - fp->_wide_data->_IO_write_base);
    }

  fp->_wide_data->_IO_buf_base = NULL;

  _IO_default_finish (fp, 0);
}