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glibc/debug/obprintf_chk.c
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/* Print output of stream to given obstack. | |
Copyright (C) 1996-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
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 <stdlib.h> | |
#include <libioP.h> | |
#include "../libio/strfile.h" | |
#include <assert.h> | |
#include <string.h> | |
#include <errno.h> | |
#include <obstack.h> | |
#include <stdarg.h> | |
#include <stdio_ext.h> | |
struct _IO_obstack_file | |
{ | |
struct _IO_FILE_plus file; | |
struct obstack *obstack; | |
}; | |
extern const struct _IO_jump_t _IO_obstack_jumps attribute_hidden; | |
int | |
__obstack_vprintf_chk (struct obstack *obstack, int flags, const char *format, | |
va_list args) | |
{ | |
struct obstack_FILE | |
{ | |
struct _IO_obstack_file ofile; | |
} new_f; | |
int result; | |
int size; | |
int room; | |
#ifdef _IO_MTSAFE_IO | |
new_f.ofile.file.file._lock = NULL; | |
#endif | |
_IO_no_init (&new_f.ofile.file.file, _IO_USER_LOCK, -1, NULL, NULL); | |
_IO_JUMPS (&new_f.ofile.file) = &_IO_obstack_jumps; | |
room = obstack_room (obstack); | |
size = obstack_object_size (obstack) + room; | |
if (size == 0) | |
{ | |
/* We have to handle the allocation a bit different since the | |
`_IO_str_init_static' function would handle a size of zero | |
different from what we expect. */ | |
/* Get more memory. */ | |
obstack_make_room (obstack, 64); | |
/* Recompute how much room we have. */ | |
room = obstack_room (obstack); | |
size = room; | |
assert (size != 0); | |
} | |
_IO_str_init_static_internal ((struct _IO_strfile_ *) &new_f.ofile, | |
obstack_base (obstack), | |
size, obstack_next_free (obstack)); | |
/* Now allocate the rest of the current chunk. */ | |
assert (size == (new_f.ofile.file.file._IO_write_end | |
- new_f.ofile.file.file._IO_write_base)); | |
assert (new_f.ofile.file.file._IO_write_ptr | |
== (new_f.ofile.file.file._IO_write_base | |
+ obstack_object_size (obstack))); | |
obstack_blank_fast (obstack, room); | |
new_f.ofile.obstack = obstack; | |
/* For flags > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n | |
can only come from read-only format strings. */ | |
if (flags > 0) | |
new_f.ofile.file.file._flags2 |= _IO_FLAGS2_FORTIFY; | |
result = _IO_vfprintf (&new_f.ofile.file.file, format, args); | |
/* Shrink the buffer to the space we really currently need. */ | |
obstack_blank_fast (obstack, (new_f.ofile.file.file._IO_write_ptr | |
- new_f.ofile.file.file._IO_write_end)); | |
return result; | |
} | |
libc_hidden_def (__obstack_vprintf_chk) | |
int | |
__obstack_printf_chk (struct obstack *obstack, int flags, const char *format, | |
...) | |
{ | |
int result; | |
va_list ap; | |
va_start (ap, format); | |
result = __obstack_vprintf_chk (obstack, flags, format, ap); | |
va_end (ap); | |
return result; | |
} |