mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-28 12:05:10 +08:00
133 lines
3.8 KiB
C++
133 lines
3.8 KiB
C++
/*
|
|
Copyright (C) 1993 Free Software Foundation
|
|
|
|
This file is part of the GNU IO Library. This library is free
|
|
software; you can redistribute it and/or modify it under the
|
|
terms of the GNU General Public License as published by the
|
|
Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
This 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this library; see the file COPYING. If not, write to the Free
|
|
Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
As a special exception, if you link this library with files
|
|
compiled with a GNU compiler to produce an executable, this does not cause
|
|
the resulting executable to be covered by the GNU General Public License.
|
|
This exception does not however invalidate any other reasons why
|
|
the executable file might be covered by the GNU General Public License. */
|
|
|
|
#include <iostream.h>
|
|
|
|
static int __xalloc = 0;
|
|
|
|
int ios::xalloc()
|
|
{
|
|
return __xalloc++;
|
|
}
|
|
|
|
static ios::fmtflags __used_fmt_flags
|
|
= ios::skipws | ios::left | ios::right | ios::internal
|
|
| ios::dec | ios::oct | ios::hex | ios::showbase | ios::showpoint
|
|
| ios::uppercase | ios::showpos | ios::scientific | ios::fixed
|
|
#ifndef _IO_NEW_STREAMS
|
|
| ios::dont_close
|
|
#endif
|
|
| ios::unitbuf | ios::stdio;
|
|
|
|
ios::fmtflags ios::bitalloc()
|
|
{
|
|
fmtflags bit_to_try = (fmtflags)1;
|
|
for (; bit_to_try; bit_to_try <<= 1)
|
|
{
|
|
if ((__used_fmt_flags & bit_to_try) == 0)
|
|
{
|
|
__used_fmt_flags |= bit_to_try;
|
|
return bit_to_try;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// NOTE: This implementation of ios::iword and ios::pword assumes
|
|
// that these methods are seldom used, so we want to minimize
|
|
// the space and time overhead when NOT using these methods.
|
|
//
|
|
// ANSI specifies two conceptually-infinite arrays, one whose
|
|
// elements are longs, and one whose elements are (void*)s.
|
|
// We implement this as a single array, each of whose element is
|
|
// a (struct ptr_and_long), which has space for both a long and a void*.
|
|
// We also specify that (the i field of) the 0'th element of the array
|
|
// contains the allocated length of the array (not counting that
|
|
// initial element).
|
|
|
|
struct ptr_and_long {
|
|
void *p;
|
|
long i;
|
|
};
|
|
|
|
static struct ptr_and_long&
|
|
get_array_element(ios& io, int index)
|
|
{
|
|
if (index < 0)
|
|
io._throw_failure();
|
|
register struct ptr_and_long *array = (ptr_and_long*)io._arrays;
|
|
int old_length = array == NULL ? 0 : array[0].i;
|
|
if (index >= old_length)
|
|
{
|
|
register int i;
|
|
int new_length = index + 10;
|
|
register struct ptr_and_long *new_array
|
|
= new ptr_and_long[1 + new_length];
|
|
if (array != NULL)
|
|
{
|
|
for (i = 1; i <= old_length; i++)
|
|
new_array[i] = array[i];
|
|
delete [] array;
|
|
}
|
|
for (i = old_length + 1; i <= new_length; i++)
|
|
{
|
|
new_array[i].i = 0;
|
|
new_array[i].p = NULL;
|
|
}
|
|
new_array[0].i = new_length;
|
|
new_array[0].p = NULL;
|
|
io._arrays = (void*)new_array;
|
|
array = new_array;
|
|
}
|
|
return array[index+1];
|
|
}
|
|
|
|
long& ios::iword(int index)
|
|
{
|
|
return get_array_element(*this, index).i;
|
|
}
|
|
|
|
void*& ios::pword(int index)
|
|
{
|
|
return get_array_element(*this, index).p;
|
|
}
|
|
|
|
long ios::iword(int index) const
|
|
{
|
|
if (index < 0)
|
|
_throw_failure();
|
|
register struct ptr_and_long *pl_array = (ptr_and_long*)_arrays;
|
|
int len = pl_array == NULL ? 0 : pl_array[0].i;
|
|
return index >= len ? 0 : pl_array[index+1].i;
|
|
}
|
|
|
|
void* ios::pword(int index) const
|
|
{
|
|
if (index < 0)
|
|
_throw_failure();
|
|
register struct ptr_and_long *pl_array = (ptr_and_long*)_arrays;
|
|
int len = pl_array == NULL ? 0 : pl_array[0].i;
|
|
return index >= len ? 0 : pl_array[index+1].p;
|
|
}
|