code.delx.au - pulseaudio/blob - src/pulsecore/dynarray.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2008 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
   8   published by the Free Software Foundation; either version 2.1 of the
   9   License, 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   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License 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 #include <stdlib.h>
  28
  29 #include <pulse/xmalloc.h>
  30 #include <pulsecore/macro.h>
  31
  32 #include "dynarray.h"
  33
  34 struct pa_dynarray {
  35     void **data;
  36     unsigned n_allocated, n_entries;
  37     pa_free_cb_t free_cb;
  38 };
  39
  40 pa_dynarray* pa_dynarray_new(pa_free_cb_t free_cb) {
  41     pa_dynarray *array;
  42
  43     array = pa_xnew0(pa_dynarray, 1);
  44     array->free_cb = free_cb;
  45
  46     return array;
  47 }
  48
  49 void pa_dynarray_free(pa_dynarray *array) {
  50     unsigned i;
  51     pa_assert(array);
  52
  53     if (array->free_cb)
  54         for (i = 0; i < array->n_entries; i++)
  55             array->free_cb(array->data[i]);
  56
  57     pa_xfree(array->data);
  58     pa_xfree(array);
  59 }
  60
  61 void pa_dynarray_append(pa_dynarray *array, void *p) {
  62     pa_assert(array);
  63     pa_assert(p);
  64
  65     if (array->n_entries == array->n_allocated) {
  66         unsigned n = PA_MAX(array->n_allocated * 2, 25U);
  67
  68         array->data = pa_xrealloc(array->data, sizeof(void *) * n);
  69         array->n_allocated = n;
  70     }
  71
  72     array->data[array->n_entries++] = p;
  73 }
  74
  75 void *pa_dynarray_get(pa_dynarray *array, unsigned i) {
  76     pa_assert(array);
  77     pa_assert(i < array->n_entries);
  78
  79     return array->data[i];
  80 }
  81
  82 void *pa_dynarray_steal_last(pa_dynarray *array) {
  83     pa_assert(array);
  84
  85     if (array->n_entries > 0)
  86         return array->data[--array->n_entries];
  87     else
  88         return NULL;
  89 }
  90
  91 unsigned pa_dynarray_size(pa_dynarray *array) {
  92     pa_assert(array);
  93
  94     return array->n_entries;
  95 }