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/**
* \file names.c
* \ingroup Configuration
* \brief Configuration helper functions - device names
* \author Jaroslav Kysela <perex@suse.cz>
* \date 2005
*
* Provide a list of device names for applications.
*
* See the \ref conf page for more details.
*/
/*
* Configuration helper functions - device names
* Copyright (c) 2005 by Jaroslav Kysela <perex@suse.cz>
*
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdarg.h>
#include <wordexp.h>
#include <dlfcn.h>
#include <limits.h>
#include <sys/stat.h>
#include <pthread.h>
#include <locale.h>
#include "local.h"
#ifndef DOC_HIDDEN
#define ALSA_NAMES_ENV "ALSA_NAMES_FILE"
#define ALSA_NAMES_PATH1 "/etc/asound.names"
#define ALSA_NAMES_PATH2 "~/.asoundnm"
#endif
static int names_parse(snd_config_t *top, const char *iface, snd_devname_t **list)
{
snd_config_iterator_t i, next;
snd_config_iterator_t j, jnext;
char *name, *comment;
const char *id;
snd_devname_t *dn, *last = NULL;
int err;
err = snd_config_search(top, iface, &top);
if (err < 0)
return err;
snd_config_for_each(i, next, top) {
snd_config_t *n = snd_config_iterator_entry(i);
if (snd_config_get_id(n, &id) < 0)
continue;
name = comment = NULL;
snd_config_for_each(j, jnext, n) {
snd_config_t *m = snd_config_iterator_entry(j);
if (snd_config_get_id(m, &id) < 0)
continue;
if (strcmp(id, "name") == 0) {
err = snd_config_get_string(m, (const char **)&name);
if (err < 0)
continue;
name = strdup(name);
if (name == NULL) {
err = -ENOMEM;
goto _err;
}
continue;
}
if (strcmp(id, "comment") == 0) {
err = snd_config_get_string(m, (const char **)&comment);
if (err < 0)
continue;
comment = strdup(comment);
if (name == NULL) {
err = -ENOMEM;
goto _err;
}
continue;
}
}
if (name != NULL) {
dn = malloc(sizeof(*dn));
if (dn == NULL) {
err = -ENOMEM;
goto _err;
}
dn->name = name;
dn->comment = comment;
dn->next = NULL;
if (last == NULL) {
*list = dn;
} else {
last->next = dn;
}
last = dn;
} else {
if (comment != NULL)
free(comment);
}
}
return 0;
_err:
if (name)
free(name);
if (comment)
free(comment);
return err;
}
/**
* \brief Give a list of device names and associated comments for selected interface
* \param iface a string identifying interface ("pcm", "ctl", "seq", "rawmidi")
* \param list result - a pointer to list
* \return A non-negative value if successful, otherwise a negative error code.
*
* The global configuration files are specified in the environment variable
* \c ALSA_NAMES_FILE.
*/
int snd_names_list(const char *iface, snd_devname_t **list)
{
char *file;
snd_config_t *top;
snd_input_t *in;
int err;
assert(iface);
assert(list);
*list = NULL;
file = getenv(ALSA_NAMES_ENV);
if (file) {
file = strdup(file);
if (file == NULL)
return -ENOMEM;
} else {
err = snd_user_file(ALSA_NAMES_PATH2, &file);
if (err < 0)
return err;
if (access(file, R_OK)) {
file = strdup(ALSA_NAMES_PATH1);
if (file == NULL)
return -ENOMEM;
}
}
top = NULL;
err = snd_config_top(&top);
if (err >= 0)
err = snd_input_stdio_open(&in, file, "r");
if (err >= 0) {
err = snd_config_load(top, in);
snd_input_close(in);
if (err < 0) {
SNDERR("%s may be old or corrupted: consider to remove or fix it", file);
} else {
err = names_parse(top, iface, list);
if (err < 0) {
snd_names_list_free(*list);
*list = NULL;
}
}
} else {
SNDERR("cannot access file %s", file);
}
if (top)
snd_config_delete(top);
return err >= 0 ? 0 : err;
}
/**
* \brief Release the list of device names
* \param list the name list to release
*
* Releases the list of device names allocated via #snd_names_list().
*/
void snd_names_list_free(snd_devname_t *list)
{
snd_devname_t *next;
while (list != NULL) {
next = list->next;
if (list->name)
free(list->name);
if (list->comment)
free(list->comment);
free(list);
list = next;
}
}
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