1/* Print output of stream to given obstack.
2 Copyright (C) 1996-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20
21#include <stdlib.h>
22#include "libioP.h"
23#include "strfile.h"
24#include <assert.h>
25#include <string.h>
26#include <errno.h>
27#include <obstack.h>
28#include <stdarg.h>
29#include <stdio_ext.h>
30
31
32struct _IO_obstack_file
33{
34 struct _IO_FILE_plus file;
35 struct obstack *obstack;
36};
37
38
39static int
40_IO_obstack_overflow (FILE *fp, int c)
41{
42 struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
43 int size;
44
45 /* Make room for another character. This might as well allocate a
46 new chunk a memory and moves the old contents over. */
47 assert (c != EOF);
48 obstack_1grow (obstack, c);
49
50 /* Setup the buffer pointers again. */
51 fp->_IO_write_base = obstack_base (obstack);
52 fp->_IO_write_ptr = obstack_next_free (obstack);
53 size = obstack_room (obstack);
54 fp->_IO_write_end = fp->_IO_write_ptr + size;
55 /* Now allocate the rest of the current chunk. */
56 obstack_blank_fast (obstack, size);
57
58 return c;
59}
60
61
62static size_t
63_IO_obstack_xsputn (FILE *fp, const void *data, size_t n)
64{
65 struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
66
67 if (fp->_IO_write_ptr + n > fp->_IO_write_end)
68 {
69 int size;
70
71 /* We need some more memory. First shrink the buffer to the
72 space we really currently need. */
73 obstack_blank_fast (obstack, fp->_IO_write_ptr - fp->_IO_write_end);
74
75 /* Now grow for N bytes, and put the data there. */
76 obstack_grow (obstack, data, n);
77
78 /* Setup the buffer pointers again. */
79 fp->_IO_write_base = obstack_base (obstack);
80 fp->_IO_write_ptr = obstack_next_free (obstack);
81 size = obstack_room (obstack);
82 fp->_IO_write_end = fp->_IO_write_ptr + size;
83 /* Now allocate the rest of the current chunk. */
84 obstack_blank_fast (obstack, size);
85 }
86 else
87 fp->_IO_write_ptr = __mempcpy (fp->_IO_write_ptr, data, n);
88
89 return n;
90}
91
92
93/* the jump table. */
94const struct _IO_jump_t _IO_obstack_jumps libio_vtable attribute_hidden =
95{
96 JUMP_INIT_DUMMY,
97 JUMP_INIT(finish, NULL),
98 JUMP_INIT(overflow, _IO_obstack_overflow),
99 JUMP_INIT(underflow, NULL),
100 JUMP_INIT(uflow, NULL),
101 JUMP_INIT(pbackfail, NULL),
102 JUMP_INIT(xsputn, _IO_obstack_xsputn),
103 JUMP_INIT(xsgetn, NULL),
104 JUMP_INIT(seekoff, NULL),
105 JUMP_INIT(seekpos, NULL),
106 JUMP_INIT(setbuf, NULL),
107 JUMP_INIT(sync, NULL),
108 JUMP_INIT(doallocate, NULL),
109 JUMP_INIT(read, NULL),
110 JUMP_INIT(write, NULL),
111 JUMP_INIT(seek, NULL),
112 JUMP_INIT(close, NULL),
113 JUMP_INIT(stat, NULL),
114 JUMP_INIT(showmanyc, NULL),
115 JUMP_INIT(imbue, NULL)
116};
117
118
119int
120__obstack_vprintf_internal (struct obstack *obstack, const char *format,
121 va_list args, unsigned int mode_flags)
122{
123 struct obstack_FILE
124 {
125 struct _IO_obstack_file ofile;
126 } new_f;
127 int result;
128 int size;
129 int room;
130
131#ifdef _IO_MTSAFE_IO
132 new_f.ofile.file.file._lock = NULL;
133#endif
134
135 _IO_no_init (&new_f.ofile.file.file, _IO_USER_LOCK, -1, NULL, NULL);
136 _IO_JUMPS (&new_f.ofile.file) = &_IO_obstack_jumps;
137 room = obstack_room (obstack);
138 size = obstack_object_size (obstack) + room;
139 if (size == 0)
140 {
141 /* We have to handle the allocation a bit different since the
142 `_IO_str_init_static' function would handle a size of zero
143 different from what we expect. */
144
145 /* Get more memory. */
146 obstack_make_room (obstack, 64);
147
148 /* Recompute how much room we have. */
149 room = obstack_room (obstack);
150 size = room;
151
152 assert (size != 0);
153 }
154
155 _IO_str_init_static_internal ((struct _IO_strfile_ *) &new_f.ofile,
156 obstack_base (obstack),
157 size, obstack_next_free (obstack));
158 /* Now allocate the rest of the current chunk. */
159 assert (size == (new_f.ofile.file.file._IO_write_end
160 - new_f.ofile.file.file._IO_write_base));
161 assert (new_f.ofile.file.file._IO_write_ptr
162 == (new_f.ofile.file.file._IO_write_base
163 + obstack_object_size (obstack)));
164 obstack_blank_fast (obstack, room);
165
166 new_f.ofile.obstack = obstack;
167
168 result = __vfprintf_internal (&new_f.ofile.file.file, format, args,
169 mode_flags);
170
171 /* Shrink the buffer to the space we really currently need. */
172 obstack_blank_fast (obstack, (new_f.ofile.file.file._IO_write_ptr
173 - new_f.ofile.file.file._IO_write_end));
174
175 return result;
176}
177
178int
179__obstack_vprintf (struct obstack *obstack, const char *format, va_list ap)
180{
181 return __obstack_vprintf_internal (obstack, format, ap, 0);
182}
183ldbl_weak_alias (__obstack_vprintf, obstack_vprintf)
184
185int
186__obstack_printf (struct obstack *obstack, const char *format, ...)
187{
188 int result;
189 va_list ap;
190 va_start (ap, format);
191 result = __obstack_vprintf_internal (obstack, format, ap, 0);
192 va_end (ap);
193 return result;
194}
195ldbl_weak_alias (__obstack_printf, obstack_printf)
196