code.delx.au - pulseaudio/blob - polyp/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 "dynarray.h"
  31 #include "xmalloc.h"
  32
  33 /* If the array becomes to small, increase its size by 100 entries */
  34 #define INCREASE_BY 100
  35
  36 struct pa_dynarray {
  37     void **data;
  38     unsigned n_allocated, n_entries;
  39 };
  40
  41 pa_dynarray* pa_dynarray_new(void) {
  42     pa_dynarray *a;
  43     a = pa_xnew(pa_dynarray, 1);
  44     a->data = NULL;
  45     a->n_entries = 0;
  46     a->n_allocated = 0;
  47     return a;
  48 }
  49
  50 void pa_dynarray_free(pa_dynarray* a, void (*func)(void *p, void *userdata), void *userdata) {
  51     unsigned i;
  52     assert(a);
  53
  54     if (func)
  55         for (i = 0; i < a->n_entries; i++)
  56             if (a->data[i])
  57                 func(a->data[i], userdata);
  58
  59     pa_xfree(a->data);
  60     pa_xfree(a);
  61 }
  62
  63 void pa_dynarray_put(pa_dynarray*a, unsigned i, void *p) {
  64     assert(a);
  65
  66     if (i >= a->n_allocated) {
  67         unsigned n;
  68
  69         if (!p)
  70             return;
  71
  72         n = i+INCREASE_BY;
  73         a->data = pa_xrealloc(a->data, sizeof(void*)*n);
  74         memset(a->data+a->n_allocated, 0, sizeof(void*)*(n-a->n_allocated));
  75         a->n_allocated = n;
  76     }
  77
  78     a->data[i] = p;
  79
  80     if (i >= a->n_entries)
  81         a->n_entries = i+1;
  82 }
  83
  84 unsigned pa_dynarray_append(pa_dynarray*a, void *p) {
  85     unsigned i = a->n_entries;
  86     pa_dynarray_put(a, i, p);
  87     return i;
  88 }
  89
  90 void *pa_dynarray_get(pa_dynarray*a, unsigned i) {
  91     assert(a);
  92     if (i >= a->n_allocated)
  93         return NULL;
  94
  95     assert(a->data);
  96     return a->data[i];
  97 }
  98
  99 unsigned pa_dynarray_size(pa_dynarray*a) {
 100     assert(a);
 101     return a->n_entries;
 102 }