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86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/*
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* Control Interface - highlevel API - hcontrol bag operations
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* Copyright (c) 2000 by Jaroslav Kysela <perex@suse.cz>
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*
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <assert.h>
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#define __USE_GNU
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#include <search.h>
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#include "control_local.h"
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int snd_ctl_hbag_create(void **bag)
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{
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assert(bag != NULL);
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*bag = NULL;
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return 0;
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}
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static void snd_ctl_hbag_free_private(snd_hcontrol_t *hcontrol ATTRIBUTE_UNUSED)
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{
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/* nothing */
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}
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int snd_ctl_hbag_destroy(void **bag, void (*hcontrol_free)(snd_hcontrol_t *hcontrol))
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{
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assert(bag != NULL);
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if (hcontrol_free == NULL)
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hcontrol_free = snd_ctl_hbag_free_private;
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tdestroy(*bag, (__free_fn_t)hcontrol_free);
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*bag = NULL;
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return 0;
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}
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int snd_ctl_hbag_add(void **bag, snd_hcontrol_t *hcontrol)
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{
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void *res;
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assert(bag != NULL && hcontrol != NULL);
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res = tsearch(hcontrol, bag, (__compar_fn_t)snd_ctl_hsort);
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if (res == NULL)
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return -ENOMEM;
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if ((snd_hcontrol_t *)res == hcontrol)
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return -EALREADY;
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return 0;
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}
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int snd_ctl_hbag_del(void **bag, snd_hcontrol_t *hcontrol)
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{
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assert(bag != NULL && hcontrol != NULL);
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if (tdelete(hcontrol, bag, (__compar_fn_t)snd_ctl_hsort) == NULL)
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return -ENOENT;
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return 0;
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}
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snd_hcontrol_t *snd_ctl_hbag_find(void **bag, snd_control_id_t *id)
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{
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void *res;
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assert(bag != NULL && id != NULL);
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if (*bag == NULL)
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return NULL;
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res = tfind(id, bag, (__compar_fn_t)snd_ctl_hsort);
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return res == NULL ? NULL : *(snd_hcontrol_t **)res;
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}
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