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c6251f03 RM |
1 | /* Copyright (C) 1991, 1995, 1997, 1998, 2004, 2006 |
2 | Free Software Foundation, Inc. | |
b5cc329c UD |
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, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | #include <stdarg.h> | |
21 | #include <stdio.h> | |
22 | #include "../libio/libioP.h" | |
23 | #include "../libio/strfile.h" | |
24 | ||
25 | extern const struct _IO_jump_t _IO_strn_jumps attribute_hidden; | |
26 | ||
27 | /* Write formatted output into S, according to the format | |
28 | string FORMAT, writing no more than MAXLEN characters. */ | |
29 | /* VARARGS5 */ | |
30 | int | |
c6251f03 RM |
31 | ___vsnprintf_chk (char *s, size_t maxlen, int flags, size_t slen, |
32 | const char *format, va_list args) | |
b5cc329c UD |
33 | { |
34 | /* XXX Maybe for less strict version do not fail immediately. | |
35 | Though, maxlen is supposed to be the size of buffer pointed | |
36 | to by s, so a conforming program can't pass such maxlen | |
37 | to *snprintf. */ | |
38 | if (__builtin_expect (slen < maxlen, 0)) | |
39 | __chk_fail (); | |
40 | ||
41 | _IO_strnfile sf; | |
42 | int ret; | |
43 | #ifdef _IO_MTSAFE_IO | |
44 | sf.f._sbf._f._lock = NULL; | |
45 | #endif | |
46 | ||
47 | /* We need to handle the special case where MAXLEN is 0. Use the | |
48 | overflow buffer right from the start. */ | |
49 | if (maxlen == 0) | |
50 | { | |
51 | s = sf.overflow_buf; | |
52 | maxlen = sizeof (sf.overflow_buf); | |
53 | } | |
54 | ||
55 | _IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, -1, NULL, NULL); | |
56 | _IO_JUMPS ((struct _IO_FILE_plus *) &sf.f._sbf) = &_IO_strn_jumps; | |
57 | s[0] = '\0'; | |
58 | ||
59 | /* For flags > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n | |
60 | can only come from read-only format strings. */ | |
61 | if (flags > 0) | |
1b1d3679 | 62 | sf.f._sbf._f._flags2 |= _IO_FLAGS2_FORTIFY; |
b5cc329c UD |
63 | |
64 | _IO_str_init_static_internal (&sf.f, s, maxlen - 1, s); | |
65 | ret = INTUSE(_IO_vfprintf) ((_IO_FILE *) &sf.f._sbf, format, args); | |
66 | ||
67 | if (sf.f._sbf._f._IO_buf_base != sf.overflow_buf) | |
68 | *sf.f._sbf._f._IO_write_ptr = '\0'; | |
69 | return ret; | |
70 | } | |
c6251f03 RM |
71 | ldbl_hidden_def (___vsnprintf_chk, __vsnprintf_chk) |
72 | ldbl_strong_alias (___vsnprintf_chk, __vsnprintf_chk) |