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conf: introduce snd_config_get_card() function

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It's helper for the "card" entries parsing. It reduces
the code in most of open_hw functions.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2021-02-24 19:20:15 +01:00
parent b9a4997e92
commit 19ad9bdc49
9 changed files with 59 additions and 83 deletions
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30
src/confmisc.c
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@ -78,6 +78,7 @@
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include "local.h"
/**
@ -142,6 +143,35 @@ int snd_config_get_bool(const snd_config_t *conf)
return err;
}
/**
* \brief Gets the card number from a configuration node.
* \param conf Handle to the configuration node to be parsed.
* \return The card number if successful, otherwise a negative error code.
*/
int snd_config_get_card(const snd_config_t *conf)
{
const char *str, *id;
long v;
int err;
if ((err = snd_config_get_integer(conf, &v)) < 0) {
if ((err = snd_config_get_string(conf, &str)) < 0) {
snd_config_get_id(conf, &id);
SNDERR("Invalid field %s", id);
return -EINVAL;
}
err = snd_card_get_index(str);
if (err < 0) {
SNDERR("Cannot get card index for %s", str);
return err;
}
v = err;
}
if (v < 0 || v > INT_MAX)
return -EINVAL;
return v;
}
/**
* \brief Gets the control interface index from the given ASCII string.
* \param ascii The string to be parsed.