1/* Copyright (C) 1994-2016 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 <http://www.gnu.org/licenses/>. */
17
18#include <stdarg.h>
19#include <stdio.h>
20#include "../libio/libioP.h"
21#include "../libio/strfile.h"
22
23
24static int _IO_str_chk_overflow (_IO_FILE *fp, int c) __THROW;
25
26static int
27_IO_str_chk_overflow (_IO_FILE *fp, int c)
28{
29 /* When we come to here this means the user supplied buffer is
30 filled. */
31 __chk_fail ();
32}
33
34
35static const struct _IO_jump_t _IO_str_chk_jumps =
36{
37 JUMP_INIT_DUMMY,
38 JUMP_INIT(finish, _IO_str_finish),
39 JUMP_INIT(overflow, _IO_str_chk_overflow),
40 JUMP_INIT(underflow, _IO_str_underflow),
41 JUMP_INIT(uflow, _IO_default_uflow),
42 JUMP_INIT(pbackfail, _IO_str_pbackfail),
43 JUMP_INIT(xsputn, _IO_default_xsputn),
44 JUMP_INIT(xsgetn, _IO_default_xsgetn),
45 JUMP_INIT(seekoff, _IO_str_seekoff),
46 JUMP_INIT(seekpos, _IO_default_seekpos),
47 JUMP_INIT(setbuf, _IO_default_setbuf),
48 JUMP_INIT(sync, _IO_default_sync),
49 JUMP_INIT(doallocate, _IO_default_doallocate),
50 JUMP_INIT(read, _IO_default_read),
51 JUMP_INIT(write, _IO_default_write),
52 JUMP_INIT(seek, _IO_default_seek),
53 JUMP_INIT(close, _IO_default_close),
54 JUMP_INIT(stat, _IO_default_stat),
55 JUMP_INIT(showmanyc, _IO_default_showmanyc),
56 JUMP_INIT(imbue, _IO_default_imbue)
57};
58
59
60int
61___vsprintf_chk (char *s, int flags, size_t slen, const char *format,
62 va_list args)
63{
64 _IO_strfile f;
65 int ret;
66#ifdef _IO_MTSAFE_IO
67 f._sbf._f._lock = NULL;
68#endif
69
70 if (slen == 0)
71 __chk_fail ();
72
73 _IO_no_init (&f._sbf._f, _IO_USER_LOCK, -1, NULL, NULL);
74 _IO_JUMPS (&f._sbf) = &_IO_str_chk_jumps;
75 s[0] = '\0';
76 _IO_str_init_static_internal (&f, s, slen - 1, s);
77
78 /* For flags > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n
79 can only come from read-only format strings. */
80 if (flags > 0)
81 f._sbf._f._flags2 |= _IO_FLAGS2_FORTIFY;
82
83 ret = _IO_vfprintf (&f._sbf._f, format, args);
84
85 *f._sbf._f._IO_write_ptr = '\0';
86 return ret;
87}
88ldbl_hidden_def (___vsprintf_chk, __vsprintf_chk)
89ldbl_strong_alias (___vsprintf_chk, __vsprintf_chk)
90