mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-11-03 09:01:52 -05:00
ucm: add the run-time variable substitution
Those two variables are supported:
${ConfName} - configuration file name
${CardId} - card identification string (like PCH)
${CardName} - card name (driver)
${CardLongName} - card long name (driver)
${env:ENV_NAME} - returns the environment variable ENV_NAME
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela
parent
40aef87f1e
commit
0dd89f3892
3 changed files with 179 additions and 22 deletions
197
src/ucm/main.c
197
src/ucm/main.c
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@ -41,9 +41,10 @@
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* misc
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*/
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static int get_value1(char **value, struct list_head *value_list,
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const char *identifier);
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static int get_value3(char **value,
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static int get_value1(snd_use_case_mgr_t *uc_mgr, char **value,
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struct list_head *value_list, const char *identifier);
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static int get_value3(snd_use_case_mgr_t *uc_mgr,
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char **value,
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const char *identifier,
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struct list_head *value_list1,
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struct list_head *value_list2,
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@ -359,7 +360,7 @@ static int execute_sequence(snd_use_case_mgr_t *uc_mgr,
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char *playback_ctl = NULL;
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char *capture_ctl = NULL;
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err = get_value3(&playback_ctl, "PlaybackCTL",
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err = get_value3(uc_mgr, &playback_ctl, "PlaybackCTL",
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value_list1,
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value_list2,
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value_list3);
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@ -367,7 +368,7 @@ static int execute_sequence(snd_use_case_mgr_t *uc_mgr,
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uc_error("cdev is not defined!");
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return err;
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}
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err = get_value3(&capture_ctl, "CaptureCTL",
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err = get_value3(uc_mgr, &capture_ctl, "CaptureCTL",
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value_list1,
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value_list2,
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value_list3);
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@ -1351,8 +1352,156 @@ int snd_use_case_get_list(snd_use_case_mgr_t *uc_mgr,
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return err;
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}
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static int get_value1(char **value, struct list_head *value_list,
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const char *identifier)
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static char *rval_conf_name(snd_use_case_mgr_t *uc_mgr)
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{
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if (uc_mgr->conf_file_name[0])
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return strdup(uc_mgr->conf_file_name);
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return NULL;
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}
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static char *rval_card_id(snd_use_case_mgr_t *uc_mgr)
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{
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struct list_head *pos;
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struct ctl_list *ctl_list = NULL;
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list_for_each(pos, &uc_mgr->ctl_list) {
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if (ctl_list) {
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uc_error("multiple control device names were found!");
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return NULL;
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}
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ctl_list = list_entry(pos, struct ctl_list, list);
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}
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if (ctl_list == NULL)
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return NULL;
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return strdup(ctl_list->ctl_id);
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}
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static char *rval_card_name(snd_use_case_mgr_t *uc_mgr)
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{
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if (uc_mgr->card_short_name)
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return strdup(uc_mgr->card_short_name);
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return NULL;
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}
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static char *rval_card_longname(snd_use_case_mgr_t *uc_mgr)
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{
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if (uc_mgr->card_long_name[0])
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return strdup(uc_mgr->card_long_name);
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return NULL;
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}
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static char *rval_env(snd_use_case_mgr_t *uc_mgr ATTRIBUTE_UNUSED, const char *id)
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{
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char *e;
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e = getenv(id);
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if (e)
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return strdup(e);
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return NULL;
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}
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#define MATCH_VARIABLE(name, id, fcn) \
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if (strncmp((name), (id), sizeof(id) - 1) == 0) { \
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rval = fcn(uc_mgr); \
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idsize = sizeof(id) - 1; \
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goto __rval; \
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}
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#define MATCH_VARIABLE2(name, id, fcn) \
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if (strncmp((name), (id), sizeof(id) - 1) == 0) { \
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idsize = sizeof(id) - 1; \
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tmp = strchr(value + idsize, '}'); \
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if (tmp) { \
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rvalsize = tmp - (value + idsize); \
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if (rvalsize > sizeof(v2)) { \
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err = -ENOMEM; \
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goto __error; \
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} \
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strncpy(v2, value + idsize, rvalsize); \
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v2[rvalsize] = '\0'; \
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idsize += rvalsize + 1; \
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rval = fcn(uc_mgr, v2); \
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goto __rval; \
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} \
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}
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static int get_substituted_value(snd_use_case_mgr_t *uc_mgr,
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char **_rvalue,
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const char *value)
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{
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size_t size, nsize, idsize, rvalsize, dpos = 0;
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const char *tmp;
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char *r, *nr, *rval, v2[32];
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int err;
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if (value == NULL)
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return -ENOENT;
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size = strlen(value) + 1;
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r = malloc(size);
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if (r == NULL)
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return -ENOMEM;
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while (*value) {
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if (*value == '$' && *(value+1) == '{') {
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MATCH_VARIABLE(value, "${ConfName}", rval_conf_name);
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MATCH_VARIABLE(value, "${CardId}", rval_card_id);
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MATCH_VARIABLE(value, "${CardName}", rval_card_name);
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MATCH_VARIABLE(value, "${CardLongName}", rval_card_longname);
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MATCH_VARIABLE2(value, "${env:", rval_env);
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err = -EINVAL;
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tmp = strchr(value, '}');
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if (tmp) {
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strncpy(r, value, tmp + 1 - value);
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r[tmp + 1 - value] = '\0';
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uc_error("variable '%s' is not known!", r);
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} else {
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uc_error("variable reference '%s' is not complete", value);
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}
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goto __error;
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__rval:
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if (rval == NULL || rval[0] == '\0') {
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free(rval);
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strncpy(r, value, idsize);
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r[idsize] = '\0';
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uc_error("variable '%s' is not defined in this context!", r);
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err = -EINVAL;
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goto __error;
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}
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value += idsize;
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rvalsize = strlen(rval);
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nsize = size + rvalsize - idsize;
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if (nsize > size) {
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nr = realloc(r, nsize);
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if (nr == NULL) {
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err = -ENOMEM;
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goto __error;
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}
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size = nsize;
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r = nr;
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}
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strcpy(r + dpos, rval);
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dpos += rvalsize;
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free(rval);
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} else {
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r[dpos++] = *value;
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value++;
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}
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}
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r[dpos] = '\0';
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*_rvalue = r;
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return 0;
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__error:
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free(r);
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return err;
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}
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static int get_value1(snd_use_case_mgr_t *uc_mgr, char **value,
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struct list_head *value_list, const char *identifier)
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{
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struct ucm_value *val;
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struct list_head *pos;
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@ -1361,18 +1510,22 @@ static int get_value1(char **value, struct list_head *value_list,
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return -ENOENT;
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list_for_each(pos, value_list) {
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val = list_entry(pos, struct ucm_value, list);
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if (check_identifier(identifier, val->name)) {
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*value = strdup(val->data);
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if (*value == NULL)
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return -ENOMEM;
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return 0;
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}
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val = list_entry(pos, struct ucm_value, list);
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if (check_identifier(identifier, val->name)) {
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if (uc_mgr->conf_format < 2) {
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*value = strdup(val->data);
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if (*value == NULL)
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return -ENOMEM;
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return 0;
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}
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return get_substituted_value(uc_mgr, value, val->data);
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}
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}
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return -ENOENT;
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}
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static int get_value3(char **value,
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static int get_value3(snd_use_case_mgr_t *uc_mgr,
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char **value,
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const char *identifier,
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struct list_head *value_list1,
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struct list_head *value_list2,
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@ -1380,13 +1533,13 @@ static int get_value3(char **value,
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{
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int err;
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err = get_value1(value, value_list1, identifier);
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err = get_value1(uc_mgr, value, value_list1, identifier);
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if (err >= 0 || err != -ENOENT)
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return err;
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err = get_value1(value, value_list2, identifier);
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err = get_value1(uc_mgr, value, value_list2, identifier);
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if (err >= 0 || err != -ENOENT)
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return err;
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err = get_value1(value, value_list3, identifier);
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err = get_value1(uc_mgr, value, value_list3, identifier);
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if (err >= 0 || err != -ENOENT)
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return err;
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return -ENOENT;
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@ -1423,7 +1576,7 @@ static int get_value(snd_use_case_mgr_t *uc_mgr,
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mod = find_modifier(uc_mgr, verb,
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mod_dev_name, 0);
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if (mod) {
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err = get_value1(value,
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err = get_value1(uc_mgr, value,
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&mod->value_list,
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identifier);
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if (err >= 0 || err != -ENOENT)
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@ -1433,7 +1586,7 @@ static int get_value(snd_use_case_mgr_t *uc_mgr,
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dev = find_device(uc_mgr, verb,
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mod_dev_name, 0);
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if (dev) {
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err = get_value1(value,
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err = get_value1(uc_mgr, value,
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&dev->value_list,
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identifier);
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if (err >= 0 || err != -ENOENT)
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@ -1444,7 +1597,7 @@ static int get_value(snd_use_case_mgr_t *uc_mgr,
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return -ENOENT;
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}
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err = get_value1(value, &verb->value_list, identifier);
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err = get_value1(uc_mgr, value, &verb->value_list, identifier);
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if (err >= 0 || err != -ENOENT)
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return err;
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}
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@ -1453,7 +1606,7 @@ static int get_value(snd_use_case_mgr_t *uc_mgr,
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return -ENOENT;
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}
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err = get_value1(value, &uc_mgr->value_list, identifier);
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err = get_value1(uc_mgr, value, &uc_mgr->value_list, identifier);
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if (err >= 0 || err != -ENOENT)
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return err;
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@ -1464,6 +1464,7 @@ static int get_card_long_name(snd_use_case_mgr_t *mgr)
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_long_name = snd_ctl_card_info_get_longname(info);
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if (!strcmp(card_name, _name) ||
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!strcmp(card_name, _long_name)) {
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snd_strlcpy(mgr->card_short_name, _name, sizeof(mgr->card_short_name));
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snd_strlcpy(mgr->card_long_name, _long_name, sizeof(mgr->card_long_name));
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return 0;
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}
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@ -1495,6 +1496,7 @@ static int get_by_card(snd_use_case_mgr_t *mgr, const char *ctl_name)
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_name = snd_ctl_card_info_get_name(info);
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_long_name = snd_ctl_card_info_get_longname(info);
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snd_strlcpy(mgr->card_short_name, _name, sizeof(mgr->card_short_name));
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snd_strlcpy(mgr->card_long_name, _long_name, sizeof(mgr->card_long_name));
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snd_strlcpy(mgr->conf_file_name, _name, sizeof(mgr->conf_file_name));
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@ -43,6 +43,7 @@
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#define SYNTAX_VERSION_MAX 2
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#define MAX_FILE 256
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#define MAX_CARD_SHORT_NAME 32
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#define MAX_CARD_LONG_NAME 80
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#define SEQUENCE_ELEMENT_TYPE_CDEV 1
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@ -204,6 +205,7 @@ struct use_case_verb {
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*/
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struct snd_use_case_mgr {
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char *card_name;
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char card_short_name[MAX_CARD_SHORT_NAME];
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char card_long_name[MAX_CARD_LONG_NAME];
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char conf_file_name[MAX_CARD_LONG_NAME];
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char *comment;
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