/*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Support for the verb/device/modifier core logic and API,
* command line tool and file parser was kindly sponsored by
* Texas Instruments Inc.
* Support for multiple active modifiers and devices,
* transition sequences, multiple client access and user defined use
* cases was kindly sponsored by Wolfson Microelectronics PLC.
*
* Copyright (C) 2019 Red Hat Inc.
* Authors: Jaroslav Kysela <perex@perex.cz>
*/
#include "ucm_local.h"
#include <sys/stat.h>
#include <limits.h>
static char *rval_conf_name(snd_use_case_mgr_t *uc_mgr)
{
if (uc_mgr->conf_file_name[0])
return strdup(uc_mgr->conf_file_name);
return NULL;
}
static char *rval_card_id(snd_use_case_mgr_t *uc_mgr)
{
struct ctl_list *ctl_list;
ctl_list = uc_mgr_get_one_ctl(uc_mgr);
if (ctl_list == NULL)
return NULL;
return strdup(snd_ctl_card_info_get_id(ctl_list->ctl_info));
}
static char *rval_card_driver(snd_use_case_mgr_t *uc_mgr)
{
struct ctl_list *ctl_list;
ctl_list = uc_mgr_get_one_ctl(uc_mgr);
if (ctl_list == NULL)
return NULL;
return strdup(snd_ctl_card_info_get_driver(ctl_list->ctl_info));
}
static char *rval_card_name(snd_use_case_mgr_t *uc_mgr)
{
struct ctl_list *ctl_list;
ctl_list = uc_mgr_get_one_ctl(uc_mgr);
if (ctl_list == NULL)
return NULL;
return strdup(snd_ctl_card_info_get_name(ctl_list->ctl_info));
}
static char *rval_card_longname(snd_use_case_mgr_t *uc_mgr)
{
struct ctl_list *ctl_list;
ctl_list = uc_mgr_get_one_ctl(uc_mgr);
if (ctl_list == NULL)
return NULL;
return strdup(snd_ctl_card_info_get_longname(ctl_list->ctl_info));
}
static char *rval_card_components(snd_use_case_mgr_t *uc_mgr)
{
struct ctl_list *ctl_list;
ctl_list = uc_mgr_get_one_ctl(uc_mgr);
if (ctl_list == NULL)
return NULL;
return strdup(snd_ctl_card_info_get_components(ctl_list->ctl_info));
}
static char *rval_env(snd_use_case_mgr_t *uc_mgr ATTRIBUTE_UNUSED, const char *id)
{
char *e;
e = getenv(id);
if (e)
return strdup(e);
return NULL;
}
static char *rval_sysfs(snd_use_case_mgr_t *uc_mgr ATTRIBUTE_UNUSED, const char *id)
{
char path[PATH_MAX], link[PATH_MAX + 1];
struct stat sb;
ssize_t len;
char *e;
int fd;
e = getenv("SYSFS_PATH");
if (e == NULL)
e = "/sys";
if (id[0] == '/')
id++;
snprintf(path, sizeof(path), "%s/%s", e, id);
if (lstat(path, &sb) != 0)
return NULL;
if (S_ISLNK(sb.st_mode)) {
len = readlink(path, link, sizeof(link) - 1);
if (len <= 0) {
uc_error("sysfs: cannot read link '%s' (%d)", path, errno);
return NULL;
}
link[len] = '\0';
e = strrchr(link, '/');
if (e)
return strdup(e + 1);
return NULL;
}
if (S_ISDIR(sb.st_mode))
return NULL;
if ((sb.st_mode & S_IRUSR) == 0)
return NULL;
fd = open(path, O_RDONLY);
if (fd < 0) {
uc_error("sysfs open failed for '%s' (%d)", path, errno);
return NULL;
}
len = read(fd, path, sizeof(path)-1);
close(fd);
if (len < 0) {
uc_error("sysfs unable to read value '%s' (%d)", path, errno);
return NULL;
}
while (len > 0 && path[len-1] == '\n')
len--;
path[len] = '\0';
return strdup(path);
}
#define MATCH_VARIABLE(name, id, fcn) \
if (strncmp((name), (id), sizeof(id) - 1) == 0) { \
rval = fcn(uc_mgr); \
idsize = sizeof(id) - 1; \
goto __rval; \
}
#define MATCH_VARIABLE2(name, id, fcn) \
if (strncmp((name), (id), sizeof(id) - 1) == 0) { \
idsize = sizeof(id) - 1; \
tmp = strchr(value + idsize, '}'); \
if (tmp) { \
rvalsize = tmp - (value + idsize); \
if (rvalsize > sizeof(v2)) { \
err = -ENOMEM; \
goto __error; \
} \
strncpy(v2, value + idsize, rvalsize); \
v2[rvalsize] = '\0'; \
idsize += rvalsize + 1; \
rval = fcn(uc_mgr, v2); \
goto __rval; \
} \
}
int uc_mgr_get_substituted_value(snd_use_case_mgr_t *uc_mgr,
char **_rvalue,
const char *value)
{
size_t size, nsize, idsize, rvalsize, dpos = 0;
const char *tmp;
char *r, *nr, *rval, v2[32];
int err;
if (value == NULL)
return -ENOENT;
size = strlen(value) + 1;
r = malloc(size);
if (r == NULL)
return -ENOMEM;
while (*value) {
if (*value == '$' && *(value+1) == '{') {
MATCH_VARIABLE(value, "${ConfName}", rval_conf_name);
MATCH_VARIABLE(value, "${CardId}", rval_card_id);
MATCH_VARIABLE(value, "${CardDriver}", rval_card_driver);
MATCH_VARIABLE(value, "${CardName}", rval_card_name);
MATCH_VARIABLE(value, "${CardLongName}", rval_card_longname);
MATCH_VARIABLE(value, "${CardComponents}", rval_card_components);
MATCH_VARIABLE2(value, "${env:", rval_env);
MATCH_VARIABLE2(value, "${sys:", rval_sysfs);
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 || 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 {
r[dpos++] = *value;
value++;
}
}
r[dpos] = '\0';
*_rvalue = r;
return 0;
__error:
free(r);
return err;
}