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ucm: add '${LibCaps}' substitution

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It is a preparation for future checking of alsa-lib's extensions.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2025-03-21 11:41:09 +01:00
parent 70f4c95df5
commit d8300e5cb7
2 changed files with 18 additions and 1 deletions
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5
src/ucm/ucm_confdoc.h
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@ -388,6 +388,7 @@ substituted. The substitutes strings are in the table bellow.
Substituted string | Value
-----------------------|---------------------
${LibCaps} | Library capabilities (string like '*a*b*c*') [**Syntax 8**]
${OpenName} | Original UCM card name (passed to snd_use_case_mgr_open())
${ConfLibDir} | Library top-level configuration directory (e.g. /usr/share/alsa)
${ConfTopDir} | Top-level UCM configuration directory (e.g. /usr/share/alsa/ucm2)
@ -433,6 +434,10 @@ Define.Bytes2 "${sys-card:[type=hex,pos=0x22]device/../descriptors}"
Replace *type=hex* with *type=ascii* or omit this variable settings to work with ASCII characters.
#### Library capabilities
None at the moment. The list will grow after *Syntax 8* (library 1.2.14).
#### Special whole string substitution
Substituted string | Value

14
src/ucm/ucm_subs.c
View file

@ -20,7 +20,7 @@
* transition sequences, multiple client access and user defined use
* cases was kindly sponsored by Wolfson Microelectronics PLC.
*
* Copyright (C) 2019 Red Hat Inc.
* Copyright (C) 2019-2025 Red Hat Inc.
* Authors: Jaroslav Kysela <perex@perex.cz>
*/
@ -30,8 +30,19 @@
#include <limits.h>
#include <regex.h>
/* capabilities string like "*a*b*c" will be used to check library extensions */
/* use Needle like "*a*" or regex expression for a match */
#define LIB_CAPS_STRING "*" "*"
static unsigned char _hex_table[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
static char *rval_lib_caps(snd_use_case_mgr_t *uc_mgr ATTRIBUTE_UNUSED)
{
if (uc_mgr->conf_format < 8)
return NULL;
return strdup(LIB_CAPS_STRING);
}
static char *rval_open_name(snd_use_case_mgr_t *uc_mgr)
{
const char *name;
@ -883,6 +894,7 @@ __std:
goto __std;
}
fcn2 = NULL;
MATCH_VARIABLE(value, "${LibCaps}", rval_lib_caps, false);
MATCH_VARIABLE(value, "${OpenName}", rval_open_name, false);
MATCH_VARIABLE(value, "${ConfLibDir}", rval_conf_libdir, false);
MATCH_VARIABLE(value, "${ConfTopDir}", rval_conf_topdir, false);