about summary refs log tree commit diff
path: root/libio/obprintf.c
blob: 4333276a1bb797c665658a99118c731c44a54aed (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
/* Print output of stream to given obstack.
   Copyright (C) 1996-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */


#include <stdlib.h>
#include "libioP.h"
#include "strfile.h"
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <obstack.h>
#include <stdarg.h>
#include <stdio_ext.h>


struct _IO_obstack_file
{
  struct _IO_FILE_plus file;
  struct obstack *obstack;
};


static int
_IO_obstack_overflow (FILE *fp, int c)
{
  struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
  int size;

  /* Make room for another character.  This might as well allocate a
     new chunk a memory and moves the old contents over.  */
  assert (c != EOF);
  obstack_1grow (obstack, c);

  /* Setup the buffer pointers again.  */
  fp->_IO_write_base = obstack_base (obstack);
  fp->_IO_write_ptr = obstack_next_free (obstack);
  size = obstack_room (obstack);
  fp->_IO_write_end = fp->_IO_write_ptr + size;
  /* Now allocate the rest of the current chunk.  */
  obstack_blank_fast (obstack, size);

  return c;
}


static size_t
_IO_obstack_xsputn (FILE *fp, const void *data, size_t n)
{
  struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;

  if (fp->_IO_write_ptr + n > fp->_IO_write_end)
    {
      int size;

      /* We need some more memory.  First shrink the buffer to the
	 space we really currently need.  */
      obstack_blank_fast (obstack, fp->_IO_write_ptr - fp->_IO_write_end);

      /* Now grow for N bytes, and put the data there.  */
      obstack_grow (obstack, data, n);

      /* Setup the buffer pointers again.  */
      fp->_IO_write_base = obstack_base (obstack);
      fp->_IO_write_ptr = obstack_next_free (obstack);
      size = obstack_room (obstack);
      fp->_IO_write_end = fp->_IO_write_ptr + size;
      /* Now allocate the rest of the current chunk.  */
      obstack_blank_fast (obstack, size);
    }
  else
    fp->_IO_write_ptr = __mempcpy (fp->_IO_write_ptr, data, n);

  return n;
}


/* the jump table.  */
const struct _IO_jump_t _IO_obstack_jumps libio_vtable attribute_hidden =
{
  JUMP_INIT_DUMMY,
  JUMP_INIT(finish, NULL),
  JUMP_INIT(overflow, _IO_obstack_overflow),
  JUMP_INIT(underflow, NULL),
  JUMP_INIT(uflow, NULL),
  JUMP_INIT(pbackfail, NULL),
  JUMP_INIT(xsputn, _IO_obstack_xsputn),
  JUMP_INIT(xsgetn, NULL),
  JUMP_INIT(seekoff, NULL),
  JUMP_INIT(seekpos, NULL),
  JUMP_INIT(setbuf, NULL),
  JUMP_INIT(sync, NULL),
  JUMP_INIT(doallocate, NULL),
  JUMP_INIT(read, NULL),
  JUMP_INIT(write, NULL),
  JUMP_INIT(seek, NULL),
  JUMP_INIT(close, NULL),
  JUMP_INIT(stat, NULL),
  JUMP_INIT(showmanyc, NULL),
  JUMP_INIT(imbue, NULL)
};


int
__obstack_vprintf_internal (struct obstack *obstack, const char *format,
			    va_list args, unsigned int mode_flags)
{
  struct obstack_FILE
    {
      struct _IO_obstack_file ofile;
  } new_f;
  int result;
  int size;
  int room;

#ifdef _IO_MTSAFE_IO
  new_f.ofile.file.file._lock = NULL;
#endif

  _IO_no_init (&new_f.ofile.file.file, _IO_USER_LOCK, -1, NULL, NULL);
  _IO_JUMPS (&new_f.ofile.file) = &_IO_obstack_jumps;
  room = obstack_room (obstack);
  size = obstack_object_size (obstack) + room;
  if (size == 0)
    {
      /* We have to handle the allocation a bit different since the
	 `_IO_str_init_static' function would handle a size of zero
	 different from what we expect.  */

      /* Get more memory.  */
      obstack_make_room (obstack, 64);

      /* Recompute how much room we have.  */
      room = obstack_room (obstack);
      size = room;

      assert (size != 0);
    }

  _IO_str_init_static_internal ((struct _IO_strfile_ *) &new_f.ofile,
				obstack_base (obstack),
				size, obstack_next_free (obstack));
  /* Now allocate the rest of the current chunk.  */
  assert (size == (new_f.ofile.file.file._IO_write_end
		   - new_f.ofile.file.file._IO_write_base));
  assert (new_f.ofile.file.file._IO_write_ptr
	  == (new_f.ofile.file.file._IO_write_base
	      + obstack_object_size (obstack)));
  obstack_blank_fast (obstack, room);

  new_f.ofile.obstack = obstack;

  result = __vfprintf_internal (&new_f.ofile.file.file, format, args,
				mode_flags);

  /* Shrink the buffer to the space we really currently need.  */
  obstack_blank_fast (obstack, (new_f.ofile.file.file._IO_write_ptr
				- new_f.ofile.file.file._IO_write_end));

  return result;
}

int
__obstack_vprintf (struct obstack *obstack, const char *format, va_list ap)
{
  return __obstack_vprintf_internal (obstack, format, ap, 0);
}
ldbl_weak_alias (__obstack_vprintf, obstack_vprintf)

int
__obstack_printf (struct obstack *obstack, const char *format, ...)
{
  int result;
  va_list ap;
  va_start (ap, format);
  result = __obstack_vprintf_internal (obstack, format, ap, 0);
  va_end (ap);
  return result;
}
ldbl_weak_alias (__obstack_printf, obstack_printf)