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Author SHA1 Message Date
Jaroslav Kysela
9b53b1f0fb conf: improve simple integer math expressions - brackets 
Add brackets to the simple math expressions like:

  $[($a+($val+100))/2]

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
 2021-11-30 14:35:58 +01:00
Jaroslav Kysela
7b6da9ee6d ucm: add ${eval:EXPR} substitution (Syntax 5) 
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>
 2021-11-30 14:22:39 +01:00
Jaroslav Kysela
bf528b9066 conf: add possibility to evaluate simple integer math expressions 
It is useful to use the math expressions for the values in configuration.
This patch adds a simple expression evaluation routines (integer only).
The syntax is simplified unix shell (bash) style.

Examples:

	$[1 + 1]
	$[$[2 + 2] / $var1]
	$[0xa0 | 0x05]

As a bonus, the variable substitutions were more abstracted.
The function snd_config_expand_custom() was introduced to be used
for example in the topology pre-precessor.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
 2021-11-30 11:33:35 +01:00