diff options
Diffstat (limited to 'REORG.TODO/debug/vsnprintf_chk.c')
-rw-r--r-- | REORG.TODO/debug/vsnprintf_chk.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/REORG.TODO/debug/vsnprintf_chk.c b/REORG.TODO/debug/vsnprintf_chk.c new file mode 100644 index 0000000000..ff911e33bb --- /dev/null +++ b/REORG.TODO/debug/vsnprintf_chk.c @@ -0,0 +1,70 @@ +/* Copyright (C) 1991-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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 + <http://www.gnu.org/licenses/>. */ + +#include <stdarg.h> +#include <stdio.h> +#include "../libio/libioP.h" +#include "../libio/strfile.h" + +extern const struct _IO_jump_t _IO_strn_jumps libio_vtable attribute_hidden; + +/* Write formatted output into S, according to the format + string FORMAT, writing no more than MAXLEN characters. */ +/* VARARGS5 */ +int +___vsnprintf_chk (char *s, size_t maxlen, int flags, size_t slen, + const char *format, va_list args) +{ + /* XXX Maybe for less strict version do not fail immediately. + Though, maxlen is supposed to be the size of buffer pointed + to by s, so a conforming program can't pass such maxlen + to *snprintf. */ + if (__glibc_unlikely (slen < maxlen)) + __chk_fail (); + + _IO_strnfile sf; + int ret; +#ifdef _IO_MTSAFE_IO + sf.f._sbf._f._lock = NULL; +#endif + + /* We need to handle the special case where MAXLEN is 0. Use the + overflow buffer right from the start. */ + if (maxlen == 0) + { + s = sf.overflow_buf; + maxlen = sizeof (sf.overflow_buf); + } + + _IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, -1, NULL, NULL); + _IO_JUMPS (&sf.f._sbf) = &_IO_strn_jumps; + s[0] = '\0'; + + /* For flags > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n + can only come from read-only format strings. */ + if (flags > 0) + sf.f._sbf._f._flags2 |= _IO_FLAGS2_FORTIFY; + + _IO_str_init_static_internal (&sf.f, s, maxlen - 1, s); + ret = _IO_vfprintf (&sf.f._sbf._f, format, args); + + if (sf.f._sbf._f._IO_buf_base != sf.overflow_buf) + *sf.f._sbf._f._IO_write_ptr = '\0'; + return ret; +} +ldbl_hidden_def (___vsnprintf_chk, __vsnprintf_chk) +ldbl_strong_alias (___vsnprintf_chk, __vsnprintf_chk) |