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conf: add possibility to evaluate simple integer math expressions

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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>
This commit is contained in:
Jaroslav Kysela 2021-11-29 14:57:29 +01:00
parent 32d332b786
commit bf528b9066
5 changed files with 389 additions and 18 deletions
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2
src/Makefile.am
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@ -14,7 +14,7 @@ SYMFUNCS =
endif
lib_LTLIBRARIES = libasound.la
libasound_la_SOURCES = conf.c confmisc.c input.c output.c async.c error.c dlmisc.c socket.c shmarea.c userfile.c names.c
libasound_la_SOURCES = conf.c confeval.c confmisc.c input.c output.c async.c error.c dlmisc.c socket.c shmarea.c userfile.c names.c
SUBDIRS=control
libasound_la_LIBADD = control/libcontrol.la