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ucm: allow to ignore errors for the value substitution

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It may be useful to ignore the errors where the environment
or sysfs values are not defined for the specific hardware.

Enhance substitution for 'syntax 3' so $${} substitution
means ignore the errors (return an empty string).

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2020-06-18 15:09:23 +02:00
parent 20e003a63d
commit e6be544227
1 changed files with 65 additions and 53 deletions
Download patch file Download diff file Expand all files Collapse all files

118
src/ucm/ucm_subs.c
View file

@ -268,6 +268,7 @@ int uc_mgr_get_substituted_value(snd_use_case_mgr_t *uc_mgr,
size_t size, nsize, idsize, rvalsize, dpos = 0;
const char *tmp;
char *r, *nr, *rval, v2[32];
bool ignore_error, allow_empty;
int err;
if (value == NULL)
@ -279,62 +280,73 @@ int uc_mgr_get_substituted_value(snd_use_case_mgr_t *uc_mgr,
return -ENOMEM;
while (*value) {
if (*value == '$' && *(value+1) == '{') {
bool allow_empty = false;
MATCH_VARIABLE(value, "${OpenName}", rval_open_name, false);
MATCH_VARIABLE(value, "${ConfTopDir}", rval_conf_topdir, false);
MATCH_VARIABLE(value, "${ConfDir}", rval_conf_dir, false);
MATCH_VARIABLE(value, "${ConfName}", rval_conf_name, false);
MATCH_VARIABLE(value, "${CardNumber}", rval_card_number, true);
MATCH_VARIABLE(value, "${CardId}", rval_card_id, false);
MATCH_VARIABLE(value, "${CardDriver}", rval_card_driver, false);
MATCH_VARIABLE(value, "${CardName}", rval_card_name, false);
MATCH_VARIABLE(value, "${CardLongName}", rval_card_longname, false);
MATCH_VARIABLE(value, "${CardComponents}", rval_card_components, true);
MATCH_VARIABLE2(value, "${env:", rval_env);
MATCH_VARIABLE2(value, "${sys:", rval_sysfs);
MATCH_VARIABLE2(value, "${var:", rval_var);
MATCH_VARIABLE2(value, "${CardIdByName:", rval_card_id_by_name);
err = -EINVAL;
tmp = strchr(value, '}');
if (tmp) {
strncpy(r, value, tmp + 1 - value);
r[tmp + 1 - value] = '\0';
uc_error("variable '%s' is not known!", r);
} else {
uc_error("variable reference '%s' is not complete", value);
}
goto __error;
__rval:
if (rval == NULL || (!allow_empty && rval[0] == '\0')) {
free(rval);
strncpy(r, value, idsize);
r[idsize] = '\0';
uc_error("variable '%s' is not defined in this context!", r);
err = -EINVAL;
goto __error;
}
value += idsize;
rvalsize = strlen(rval);
nsize = size + rvalsize - idsize;
if (nsize > size) {
nr = realloc(r, nsize);
if (nr == NULL) {
free(rval);
err = -ENOMEM;
goto __error;
}
size = nsize;
r = nr;
}
strcpy(r + dpos, rval);
dpos += rvalsize;
free(rval);
} else {
if (*value != '$') {
__std:
r[dpos++] = *value;
value++;
continue;
}
ignore_error = false;
if (value[1] == '$' && value[2] == '{' && uc_mgr->conf_format >= 3) {
value++;
ignore_error = true;
} else if (value[1] != '{') {
goto __std;
}
allow_empty = false;
MATCH_VARIABLE(value, "${OpenName}", rval_open_name, false);
MATCH_VARIABLE(value, "${ConfTopDir}", rval_conf_topdir, false);
MATCH_VARIABLE(value, "${ConfDir}", rval_conf_dir, false);
MATCH_VARIABLE(value, "${ConfName}", rval_conf_name, false);
MATCH_VARIABLE(value, "${CardNumber}", rval_card_number, true);
MATCH_VARIABLE(value, "${CardId}", rval_card_id, false);
MATCH_VARIABLE(value, "${CardDriver}", rval_card_driver, false);
MATCH_VARIABLE(value, "${CardName}", rval_card_name, false);
MATCH_VARIABLE(value, "${CardLongName}", rval_card_longname, false);
MATCH_VARIABLE(value, "${CardComponents}", rval_card_components, true);
MATCH_VARIABLE2(value, "${env:", rval_env);
MATCH_VARIABLE2(value, "${sys:", rval_sysfs);
MATCH_VARIABLE2(value, "${var:", rval_var);
MATCH_VARIABLE2(value, "${CardIdByName:", rval_card_id_by_name);
err = -EINVAL;
tmp = strchr(value, '}');
if (tmp) {
strncpy(r, value, tmp + 1 - value);
r[tmp + 1 - value] = '\0';
uc_error("variable '%s' is not known!", r);
} else {
uc_error("variable reference '%s' is not complete", value);
}
goto __error;
__rval:
if (rval == NULL || (!allow_empty && rval[0] == '\0')) {
free(rval);
if (ignore_error) {
value += idsize;
continue;
}
strncpy(r, value, idsize);
r[idsize] = '\0';
uc_error("variable '%s' is not defined in this context!", r);
err = -EINVAL;
goto __error;
}
value += idsize;
rvalsize = strlen(rval);
nsize = size + rvalsize - idsize;
if (nsize > size) {
nr = realloc(r, nsize);
if (nr == NULL) {
free(rval);
err = -ENOMEM;
goto __error;
}
size = nsize;
r = nr;
}
strcpy(r + dpos, rval);
dpos += rvalsize;
free(rval);
}
r[dpos] = '\0';