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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio 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   polypaudio 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 polypaudio; 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 <assert.h>
  28 #include <stdlib.h>
  29
  30 #include <polyp/xmalloc.h>
  31
  32 #include "dynarray.h"
  33
  34 /* If the array becomes to small, increase its size by 100 entries */
  35 #define INCREASE_BY 100
  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     a = pa_xnew(pa_dynarray, 1);
  45     a->data = NULL;
  46     a->n_entries = 0;
  47     a->n_allocated = 0;
  48     return a;
  49 }
  50
  51 void pa_dynarray_free(pa_dynarray* a, void (*func)(void *p, void *userdata), void *userdata) {
  52     unsigned i;
  53     assert(a);
  54
  55     if (func)
  56         for (i = 0; i < a->n_entries; i++)
  57             if (a->data[i])
  58                 func(a->data[i], userdata);
  59
  60     pa_xfree(a->data);
  61     pa_xfree(a);
  62 }
  63
  64 void pa_dynarray_put(pa_dynarray*a, unsigned i, void *p) {
  65     assert(a);
  66
  67     if (i >= a->n_allocated) {
  68         unsigned n;
  69
  70         if (!p)
  71             return;
  72
  73         n = i+INCREASE_BY;
  74         a->data = pa_xrealloc(a->data, sizeof(void*)*n);
  75         memset(a->data+a->n_allocated, 0, sizeof(void*)*(n-a->n_allocated));
  76         a->n_allocated = n;
  77     }
  78
  79     a->data[i] = p;
  80
  81     if (i >= a->n_entries)
  82         a->n_entries = i+1;
  83 }
  84
  85 unsigned pa_dynarray_append(pa_dynarray*a, void *p) {
  86     unsigned i = a->n_entries;
  87     pa_dynarray_put(a, i, p);
  88     return i;
  89 }
  90
  91 void *pa_dynarray_get(pa_dynarray*a, unsigned i) {
  92     assert(a);
  93     if (i >= a->n_allocated)
  94         return NULL;
  95
  96     assert(a->data);
  97     return a->data[i];
  98 }
  99
 100 unsigned pa_dynarray_size(pa_dynarray*a) {
 101     assert(a);
 102     return a->n_entries;
 103 }