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