1/* Print output of stream to given obstack.
2 Copyright (C) 1996-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19
20#include <stdlib.h>
21#include "libioP.h"
22#include "strfile.h"
23#include <assert.h>
24#include <string.h>
25#include <errno.h>
26#include <obstack.h>
27#include <stdarg.h>
28#include <stdio_ext.h>
29
30
31struct _IO_obstack_file
32{
33 struct _IO_FILE_plus file;
34 struct obstack *obstack;
35};
36
37
38static int
39_IO_obstack_overflow (FILE *fp, int c)
40{
41 struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
42 int size;
43
44 /* Make room for another character. This might as well allocate a
45 new chunk a memory and moves the old contents over. */
46 assert (c != EOF);
47 obstack_1grow (obstack, c);
48
49 /* Setup the buffer pointers again. */
50 fp->_IO_write_base = obstack_base (obstack);
51 fp->_IO_write_ptr = obstack_next_free (obstack);
52 size = obstack_room (obstack);
53 fp->_IO_write_end = fp->_IO_write_ptr + size;
54 /* Now allocate the rest of the current chunk. */
55 obstack_blank_fast (obstack, size);
56
57 return c;
58}
59
60
61static size_t
62_IO_obstack_xsputn (FILE *fp, const void *data, size_t n)
63{
64 struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
65
66 if (fp->_IO_write_ptr + n > fp->_IO_write_end)
67 {
68 int size;
69
70 /* We need some more memory. First shrink the buffer to the
71 space we really currently need. */
72 obstack_blank_fast (obstack, fp->_IO_write_ptr - fp->_IO_write_end);
73
74 /* Now grow for N bytes, and put the data there. */
75 obstack_grow (obstack, data, n);
76
77 /* Setup the buffer pointers again. */
78 fp->_IO_write_base = obstack_base (obstack);
79 fp->_IO_write_ptr = obstack_next_free (obstack);
80 size = obstack_room (obstack);
81 fp->_IO_write_end = fp->_IO_write_ptr + size;
82 /* Now allocate the rest of the current chunk. */
83 obstack_blank_fast (obstack, size);
84 }
85 else
86 fp->_IO_write_ptr = __mempcpy (fp->_IO_write_ptr, data, n);
87
88 return n;
89}
90
91
92/* the jump table. */
93const struct _IO_jump_t _IO_obstack_jumps libio_vtable attribute_hidden =
94{
95 JUMP_INIT_DUMMY,
96 JUMP_INIT(finish, NULL),
97 JUMP_INIT(overflow, _IO_obstack_overflow),
98 JUMP_INIT(underflow, NULL),
99 JUMP_INIT(uflow, NULL),
100 JUMP_INIT(pbackfail, NULL),
101 JUMP_INIT(xsputn, _IO_obstack_xsputn),
102 JUMP_INIT(xsgetn, NULL),
103 JUMP_INIT(seekoff, NULL),
104 JUMP_INIT(seekpos, NULL),
105 JUMP_INIT(setbuf, NULL),
106 JUMP_INIT(sync, NULL),
107 JUMP_INIT(doallocate, NULL),
108 JUMP_INIT(read, NULL),
109 JUMP_INIT(write, NULL),
110 JUMP_INIT(seek, NULL),
111 JUMP_INIT(close, NULL),
112 JUMP_INIT(stat, NULL),
113 JUMP_INIT(showmanyc, NULL),
114 JUMP_INIT(imbue, NULL)
115};
116
117
118int
119__obstack_vprintf_internal (struct obstack *obstack, const char *format,
120 va_list args, unsigned int mode_flags)
121{
122 struct obstack_FILE
123 {
124 struct _IO_obstack_file ofile;
125 } new_f;
126 int result;
127 int size;
128 int room;
129
130#ifdef _IO_MTSAFE_IO
131 new_f.ofile.file.file._lock = NULL;
132#endif
133
134 _IO_no_init (&new_f.ofile.file.file, _IO_USER_LOCK, -1, NULL, NULL);
135 _IO_JUMPS (&new_f.ofile.file) = &_IO_obstack_jumps;
136 room = obstack_room (obstack);
137 size = obstack_object_size (obstack) + room;
138 if (size == 0)
139 {
140 /* We have to handle the allocation a bit different since the
141 `_IO_str_init_static' function would handle a size of zero
142 different from what we expect. */
143
144 /* Get more memory. */
145 obstack_make_room (obstack, 64);
146
147 /* Recompute how much room we have. */
148 room = obstack_room (obstack);
149 size = room;
150
151 assert (size != 0);
152 }
153
154 _IO_str_init_static_internal ((struct _IO_strfile_ *) &new_f.ofile,
155 obstack_base (obstack),
156 size, obstack_next_free (obstack));
157 /* Now allocate the rest of the current chunk. */
158 assert (size == (new_f.ofile.file.file._IO_write_end
159 - new_f.ofile.file.file._IO_write_base));
160 assert (new_f.ofile.file.file._IO_write_ptr
161 == (new_f.ofile.file.file._IO_write_base
162 + obstack_object_size (obstack)));
163 obstack_blank_fast (obstack, room);
164
165 new_f.ofile.obstack = obstack;
166
167 result = __vfprintf_internal (&new_f.ofile.file.file, format, args,
168 mode_flags);
169
170 /* Shrink the buffer to the space we really currently need. */
171 obstack_blank_fast (obstack, (new_f.ofile.file.file._IO_write_ptr
172 - new_f.ofile.file.file._IO_write_end));
173
174 return result;
175}
176
177int
178__obstack_vprintf (struct obstack *obstack, const char *format, va_list ap)
179{
180 return __obstack_vprintf_internal (obstack, format, ap, 0);
181}
182ldbl_weak_alias (__obstack_vprintf, obstack_vprintf)
183
184int
185__obstack_printf (struct obstack *obstack, const char *format, ...)
186{
187 int result;
188 va_list ap;
189 va_start (ap, format);
190 result = __obstack_vprintf_internal (obstack, format, ap, 0);
191 va_end (ap);
192 return result;
193}
194ldbl_weak_alias (__obstack_printf, obstack_printf)
195