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rxvtutil.C
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rxvtutil.C
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/*----------------------------------------------------------------------*
* File: rxvtutil.C
*----------------------------------------------------------------------*
*
* All portions of code are copyright by their respective author/s.
* Copyright (c) 2004-2006 Marc Lehmann <schmorp@schmorp.de>
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*----------------------------------------------------------------------*/
#include <cstdlib>
#include <cstring>
#include <inttypes.h>
#include "rxvtutil.h"
#if !HAVE_GCC_BUILTINS
int rxvt_ctz (unsigned int x) CONST
{
int r = 0;
x &= -x; // this isolates the lowest bit
if (x & 0xaaaaaaaa) r += 1;
if (x & 0xcccccccc) r += 2;
if (x & 0xf0f0f0f0) r += 4;
if (x & 0xff00ff00) r += 8;
if (x & 0xffff0000) r += 16;
return r;
}
int rxvt_popcount (unsigned int x) CONST
{
x -= (x >> 1) & 0x55555555;
x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
x = ((x >> 4) + x) & 0x0f0f0f0f;
x *= 0x01010101;
return x >> 24;
}
#endif
void *
zero_initialized::operator new (size_t s)
{
void *p = malloc (s);
memset (p, 0, s);
return p;
}
void
zero_initialized::operator delete (void *p, size_t s)
{
free (p);
}
static void *temp_buf;
static uint32_t temp_len;
void *
rxvt_temp_buf (int len)
{
if (len > temp_len)
{
free (temp_buf);
temp_buf = malloc (len);
temp_len = len;
}
return temp_buf;
}