src/pulsecore/bitset.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2009 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <string.h>
  27
  28 #include <pulse/xmalloc.h>
  29
  30 #include "bitset.h"
  31
  32 void pa_bitset_set(pa_bitset_t *b, unsigned k, pa_bool_t v) {
  33     pa_assert(b);
  34
  35     if (v)
  36         b[k >> 5] |= 1 << (k & 31);
  37     else
  38         b[k >> 5] &= ~((uint32_t) (1 << (k & 31)));
  39 }
  40
  41 pa_bool_t pa_bitset_get(const pa_bitset_t *b, unsigned k) {
  42     return !!(b[k >> 5] & (1 << (k & 31)));
  43 }
  44
  45 pa_bool_t pa_bitset_equals(const pa_bitset_t *b, unsigned n, ...) {
  46     va_list ap;
  47     pa_bitset_t *a;
  48     pa_bool_t equal;
  49
  50     a = pa_xnew0(pa_bitset_t, PA_BITSET_ELEMENTS(n));
  51
  52     va_start(ap, n);
  53     for (;;) {
  54         int j = va_arg(ap, int);
  55
  56         if (j < 0)
  57             break;
  58
  59         pa_bitset_set(a, j, TRUE);
  60     }
  61     va_end(ap);
  62
  63     equal = memcmp(a, b, PA_BITSET_SIZE(n)) == 0;
  64     pa_xfree(a);
  65
  66     return equal;
  67 }