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conf: remove alloca() from snd_func_pcm_id()

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Both of alloca() and automatic variables keeps storages on stack, while
the former generates more instructions than the latter. It's better to use
the latter if the size of storage is computable at pre-compile or compile
time; i.e. just for structures.

This commit obsolete usages of alloca() with automatic variables.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2016-07-14 23:07:43 +09:00 • committed by Takashi Iwai
parent e1f4b9a7ca
commit c0cc9a0195
1 changed files with 6 additions and 6 deletions
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12
src/confmisc.c
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@ -969,7 +969,7 @@ int snd_func_pcm_id(snd_config_t **dst, snd_config_t *root, snd_config_t *src, v
{
snd_config_t *n;
snd_ctl_t *ctl = NULL;
snd_pcm_info_t *info;
snd_pcm_info_t info = {0};
const char *id;
long card, device, subdevice = 0;
int err;
@ -1009,17 +1009,17 @@ int snd_func_pcm_id(snd_config_t **dst, snd_config_t *root, snd_config_t *src, v
SNDERR("could not open control for card %li", card);
goto __error;
}
snd_pcm_info_alloca(&info);
snd_pcm_info_set_device(info, device);
snd_pcm_info_set_subdevice(info, subdevice);
err = snd_ctl_pcm_info(ctl, info);
snd_pcm_info_set_device(&info, device);
snd_pcm_info_set_subdevice(&info, subdevice);
err = snd_ctl_pcm_info(ctl, &info);
if (err < 0) {
SNDERR("snd_ctl_pcm_info error: %s", snd_strerror(err));
goto __error;
}
err = snd_config_get_id(src, &id);
if (err >= 0)
err = snd_config_imake_string(dst, id, snd_pcm_info_get_id(info));
err = snd_config_imake_string(dst, id,
snd_pcm_info_get_id(&info));
__error:
if (ctl)
snd_ctl_close(ctl);