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 /* If the array becomes to small, increase its size by 25 entries */
  35 #define INCREASE_BY 25
  36
  37 struct pa_dynarray {
  38     void **data;
  39     unsigned n_allocated, n_entries;
  40 };
  41
  42 pa_dynarray* pa_dynarray_new(void) {
  43     pa_dynarray *a;
  44
  45     a = pa_xnew(pa_dynarray, 1);
  46     a->data = NULL;
  47     a->n_entries = 0;
  48     a->n_allocated = 0;
  49
  50     return a;
  51 }
  52
  53 void pa_dynarray_free(pa_dynarray* a, pa_free2_cb_t free_func, void *userdata) {
  54     unsigned i;
  55     pa_assert(a);
  56
  57     if (free_func)
  58         for (i = 0; i < a->n_entries; i++)
  59             if (a->data[i])
  60                 free_func(a->data[i], userdata);
  61
  62     pa_xfree(a->data);
  63     pa_xfree(a);
  64 }
  65
  66 void pa_dynarray_put(pa_dynarray*a, unsigned i, void *p) {
  67     pa_assert(a);
  68
  69     if (i >= a->n_allocated) {
  70         unsigned n;
  71
  72         if (!p)
  73             return;
  74
  75         n = i+INCREASE_BY;
  76         a->data = pa_xrealloc(a->data, sizeof(void*)*n);
  77         memset(a->data+a->n_allocated, 0, sizeof(void*)*(n-a->n_allocated));
  78         a->n_allocated = n;
  79     }
  80
  81     a->data[i] = p;
  82
  83     if (i >= a->n_entries)
  84         a->n_entries = i+1;
  85 }
  86
  87 unsigned pa_dynarray_append(pa_dynarray*a, void *p) {
  88     unsigned i;
  89
  90     pa_assert(a);
  91
  92     i = a->n_entries;
  93     pa_dynarray_put(a, i, p);
  94
  95     return i;
  96 }
  97
  98 void *pa_dynarray_get(pa_dynarray*a, unsigned i) {
  99     pa_assert(a);
 100
 101     if (i >= a->n_entries)
 102         return NULL;
 103
 104     pa_assert(a->data);
 105     return a->data[i];
 106 }
 107
 108 unsigned pa_dynarray_size(pa_dynarray*a) {
 109     pa_assert(a);
 110
 111     return a->n_entries;
 112 }