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ucm: add ${eval:EXPR} substitution (Syntax 5)

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It is useful to do simple integer math in UCM configurations, too.
Use snd_config_evaluate_string() string for this job.

Example:

    ${eval:1+1}
    ${eval:100*$var1}
    ${eval:$[$var2+1]/5}

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2021-11-30 14:19:58 +01:00
parent bf528b9066
commit 7b6da9ee6d
3 changed files with 42 additions and 5 deletions
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8
src/confeval.c
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@ -119,8 +119,8 @@ static int _to_integer(value_type_t *val, snd_config_t *c)
return 0;
}
static int _eval_string(snd_config_t **dst, const char *s,
snd_config_expand_fcn_t fcn, void *private_data)
int _snd_eval_string(snd_config_t **dst, const char *s,
snd_config_expand_fcn_t fcn, void *private_data)
{
snd_config_t *tmp;
const char *save, *e;
@ -174,7 +174,7 @@ static int _eval_string(snd_config_t **dst, const char *s,
return -ENOMEM;
memcpy(m, s + 2, e - s - 2);
m[e - s - 3] = '\0';
err = _eval_string(&tmp, m, fcn, private_data);
err = _snd_eval_string(&tmp, m, fcn, private_data);
free(m);
if (err < 0)
return err;
@ -250,7 +250,7 @@ int snd_config_evaluate_string(snd_config_t **dst, const char *s,
if (*s != '$')
return -EINVAL;
if (s[1] == '[') {
err = _eval_string(dst, s, fcn, private_data);
err = _snd_eval_string(dst, s, fcn, private_data);
if (err < 0)
SNDERR("wrong expression '%s'", s);
} else {