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698fb75b9f
There are a lot more printf variants than there are scanf variants,
and the code for setting up and tearing down their custom FILE
variants around the call to __vf(w)printf is more complicated and
variable. Therefore, I have added _internal versions of all the
v*printf variants, rather than introducing helper routines so that
they can all directly call __vf(w)printf_internal, as was done with
scanf.
As with the scanf changes, in this patch the _internal functions still
look at the environmental mode bits and all callers pass 0 for the
flags parameter.
Several of the affected public functions had _IO_ name aliases that
were not exported (but, in one case, appeared in libio.h anyway);
I was originally planning to leave them as aliases to avoid having
to touch internal callers, but it turns out ldbl_*_alias only work
for exported symbols, so they've all been removed instead. It also
turns out there were hardly any internal callers. _IO_vsprintf and
_IO_vfprintf *are* exported, so those two stick around.
Summary for the changes to each of the affected symbols:
_IO_vfprintf, _IO_vsprintf:
All internal calls removed, thus the internal declarations, as well
as uses of libc_hidden_proto and libc_hidden_def, were also removed.
The external symbol is now exposed via uses of ldbl_strong_alias
to __vfprintf_internal and __vsprintf_internal, respectively.
_IO_vasprintf, _IO_vdprintf, _IO_vsnprintf,
_IO_vfwprintf, _IO_vswprintf,
_IO_obstack_vprintf, _IO_obstack_printf:
All internal calls removed, thus declaration in internal headers
were also removed. They were never exported, so there are no
aliases tying them to the internal functions. I.e.: entirely gone.
__vsnprintf:
Internal calls were always preceded by macros such as
#define __vsnprintf _IO_vsnprintf, and
#define __vsnprintf vsnprintf
The macros were removed and their uses replaced with calls to the
new internal function __vsnprintf_internal. Since there were no
internal calls, the internal declaration was also removed. The
external symbol is preserved with ldbl_weak_alias to ___vsnprintf.
__vfwprintf:
All internal calls converted into calls to __vfwprintf_internal,
thus the internal declaration was removed. The function is now a
wrapper that calls __vfwprintf_internal. The external symbol is
preserved.
__vswprintf:
Similarly, but no external symbol.
__vasprintf, __vdprintf, __vfprintf, __vsprintf:
New internal wrappers. Not exported.
vasprintf, vdprintf, vfprintf, vsprintf, vsnprintf,
vfwprintf, vswprintf,
obstack_vprintf, obstack_printf:
These functions used to be aliases to the respective _IO_* function,
they are now aliases to their respective __* functions.
Tested for powerpc and powerpc64le.
93 lines
3.3 KiB
C
93 lines
3.3 KiB
C
/* Copyright (C) 1995-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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#include <string.h>
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#include <stdlib.h>
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#include <strfile.h>
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int
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__vasprintf_internal (char **result_ptr, const char *format, va_list args,
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unsigned int mode_flags)
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{
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/* Initial size of the buffer to be used. Will be doubled each time an
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overflow occurs. */
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const size_t init_string_size = 100;
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char *string;
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_IO_strfile sf;
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int ret;
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size_t needed;
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size_t allocated;
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/* No need to clear the memory here (unlike for open_memstream) since
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we know we will never seek on the stream. */
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string = (char *) malloc (init_string_size);
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if (string == NULL)
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return -1;
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#ifdef _IO_MTSAFE_IO
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sf._sbf._f._lock = NULL;
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#endif
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_IO_no_init (&sf._sbf._f, _IO_USER_LOCK, -1, NULL, NULL);
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_IO_JUMPS (&sf._sbf) = &_IO_str_jumps;
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_IO_str_init_static_internal (&sf, string, init_string_size, string);
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sf._sbf._f._flags &= ~_IO_USER_BUF;
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sf._s._allocate_buffer_unused = (_IO_alloc_type) malloc;
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sf._s._free_buffer_unused = (_IO_free_type) free;
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ret = __vfprintf_internal (&sf._sbf._f, format, args, mode_flags);
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if (ret < 0)
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{
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free (sf._sbf._f._IO_buf_base);
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return ret;
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}
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/* Only use realloc if the size we need is of the same (binary)
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order of magnitude then the memory we allocated. */
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needed = sf._sbf._f._IO_write_ptr - sf._sbf._f._IO_write_base + 1;
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allocated = sf._sbf._f._IO_write_end - sf._sbf._f._IO_write_base;
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if ((allocated >> 1) <= needed)
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*result_ptr = (char *) realloc (sf._sbf._f._IO_buf_base, needed);
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else
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{
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*result_ptr = (char *) malloc (needed);
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if (*result_ptr != NULL)
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{
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memcpy (*result_ptr, sf._sbf._f._IO_buf_base, needed - 1);
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free (sf._sbf._f._IO_buf_base);
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}
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else
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/* We have no choice, use the buffer we already have. */
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*result_ptr = (char *) realloc (sf._sbf._f._IO_buf_base, needed);
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}
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if (*result_ptr == NULL)
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*result_ptr = sf._sbf._f._IO_buf_base;
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(*result_ptr)[needed - 1] = '\0';
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return ret;
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}
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int
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__vasprintf (char **result_ptr, const char *format, va_list args)
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{
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return __vasprintf_internal (result_ptr, format, args, 0);
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}
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ldbl_weak_alias (__vasprintf, vasprintf)
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