Enhanced configuration syntax (added [ ] block for arrays).

The snd_config_expand functions expands the runtime contents (@func...).
Removed the environment variable replace code from the configuration parser.
Updated the alsa.conf configuration file.
This commit is contained in:
Jaroslav Kysela 2001-06-13 09:31:05 +00:00
parent bf780a25a5
commit 5c3075d32f
9 changed files with 1062 additions and 485 deletions

View file

@ -1,6 +1,7 @@
/*
* Configuration helper functions
* Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
* Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>,
* Jaroslav Kysela <perex@suse.cz>
*
*
* This library is free software; you can redistribute it and/or modify
@ -22,6 +23,7 @@
#include <stdarg.h>
#include <wordexp.h>
#include <sys/stat.h>
#include <dlfcn.h>
#include "local.h"
#include "list.h"
@ -151,44 +153,9 @@ static int get_char_skip_comments(input_t *input)
int err = get_delimstring(&str, '>', input);
if (err < 0)
return err;
if (strlen(str) < 3 ||
str[0] != '@' ||
str[strlen(str)-1] != '@' ||
strchr(str, ':') == NULL) {
err = snd_input_stdio_open(&in, str, "r");
if (err < 0)
return err;
} else {
char *envvar = str + 1;
char *envdef = strchr(str, ':');
char *env, *end;
str[strlen(str)-1] = '\0';
*envdef++ = '\0';
if (*envdef == '\0') {
free(str);
input->error = BAD_ENV_DEFAULT;
return -EINVAL;
}
while (1) {
end = strchr(envvar, ',');
if (end)
*end = '\0';
env = getenv(envvar);
if (env != NULL && *env != '\0')
break;
if (end) {
*end = ','; /* repair for fd->name */
envvar = end + 1;
} else {
env = envdef;
break;
}
}
err = snd_input_buffer_open(&in, env, strlen(env));
if (err < 0)
return err;
}
err = snd_input_stdio_open(&in, str, "r");
if (err < 0)
return err;
fd = malloc(sizeof(*fd));
if (!fd)
return -ENOMEM;
@ -272,7 +239,7 @@ static int get_quotedchar(input_t *input)
static int get_freestring(char **string, int id, input_t *input)
{
const size_t bufsize = 256;
const size_t bufsize = 64;
char _buf[bufsize];
char *buf = _buf;
size_t alloc = bufsize;
@ -295,6 +262,8 @@ static int get_freestring(char **string, int id, input_t *input)
case ';':
case '{':
case '}':
case '[':
case ']':
case '\'':
case '"':
case '\\':
@ -319,11 +288,17 @@ static int get_freestring(char **string, int id, input_t *input)
alloc *= 2;
if (old_alloc == bufsize) {
buf = malloc(alloc);
if (buf == NULL)
return -ENOMEM;
memcpy(buf, _buf, old_alloc);
} else
buf = realloc(buf, alloc);
if (!buf)
return -ENOMEM;
} else {
char *ptr = realloc(buf, alloc);
if (ptr == NULL) {
free(buf);
return -ENOMEM;
}
buf = ptr;
}
}
buf[idx++] = c;
}
@ -332,7 +307,7 @@ static int get_freestring(char **string, int id, input_t *input)
static int get_delimstring(char **string, int delim, input_t *input)
{
const size_t bufsize = 256;
const size_t bufsize = 64;
char _buf[bufsize];
char *buf = _buf;
size_t alloc = bufsize;
@ -369,11 +344,17 @@ static int get_delimstring(char **string, int delim, input_t *input)
alloc *= 2;
if (old_alloc == bufsize) {
buf = malloc(alloc);
if (buf == NULL)
return -ENOMEM;
memcpy(buf, _buf, old_alloc);
} else
buf = realloc(buf, alloc);
if (!buf)
return -ENOMEM;
} else {
char *ptr = realloc(buf, alloc);
if (ptr == NULL) {
free(buf);
return -ENOMEM;
}
buf = ptr;
}
}
buf[idx++] = c;
}
@ -394,6 +375,8 @@ static int get_string(char **string, int id, input_t *input)
case '.':
case '{':
case '}':
case '[':
case ']':
input->error = UNEXPECTED_CHAR;
return -EINVAL;
case '\'':
@ -411,17 +394,21 @@ static int get_string(char **string, int id, input_t *input)
}
}
static int _snd_config_make(snd_config_t **config, char *id,
snd_config_type_t type)
static int _snd_config_make(snd_config_t **config, char **id, snd_config_type_t type)
{
snd_config_t *n;
n = calloc(1, sizeof(*n));
if (n == NULL) {
if (id)
free(id);
if (*id) {
free(*id);
*id = NULL;
}
return -ENOMEM;
}
n->id = id;
if (id) {
n->id = *id;
*id = NULL;
}
n->type = type;
if (type == SND_CONFIG_TYPE_COMPOUND)
INIT_LIST_HEAD(&n->u.compound.fields);
@ -430,7 +417,7 @@ static int _snd_config_make(snd_config_t **config, char *id,
}
static int _snd_config_make_add(snd_config_t **config, char *id,
static int _snd_config_make_add(snd_config_t **config, char **id,
snd_config_type_t type, snd_config_t *father)
{
snd_config_t *n;
@ -457,38 +444,182 @@ static int _snd_config_search(snd_config_t *config,
} else if (strlen(n->id) != (size_t) len ||
memcmp(n->id, id, (size_t) len) != 0)
continue;
*result = n;
if (result)
*result = n;
return 0;
}
return -ENOENT;
}
static int parse_value(snd_config_t **_n, snd_config_t *father, input_t *input, char **id)
{
snd_config_t *n = *_n;
char *s;
int err;
err = get_string(&s, 0, input);
if (err < 0)
return err;
if ((s[0] >= '0' && s[0] <= '9') || s[0] == '-') {
long i;
errno = 0;
err = safe_strtol(s, &i);
if (err < 0) {
double r;
err = safe_strtod(s, &r);
if (err >= 0) {
free(s);
if (n) {
if (n->type != SND_CONFIG_TYPE_REAL) {
SNDERR("%s is not a real", id);
return -EINVAL;
}
} else {
err = _snd_config_make_add(&n, id, SND_CONFIG_TYPE_REAL, father);
if (err < 0)
return err;
}
n->u.real = r;
*_n = n;
return 0;
}
} else {
free(s);
if (n) {
if (n->type != SND_CONFIG_TYPE_INTEGER) {
SNDERR("%s is not an integer", id);
return -EINVAL;
}
} else {
err = _snd_config_make_add(&n, id, SND_CONFIG_TYPE_INTEGER, father);
if (err < 0)
return err;
}
n->u.integer = i;
*_n = n;
return 0;
}
}
if (n) {
if (n->type != SND_CONFIG_TYPE_STRING) {
SNDERR("%s is not a string", id);
free(s);
return -EINVAL;
}
} else {
err = _snd_config_make_add(&n, id, SND_CONFIG_TYPE_STRING, father);
if (err < 0)
return err;
}
if (n->u.string)
free(n->u.string);
n->u.string = s;
*_n = n;
return 0;
}
static int parse_defs(snd_config_t *father, input_t *input);
static int parse_array_defs(snd_config_t *farther, input_t *input);
static int parse_array_def(snd_config_t *father, input_t *input, int idx)
{
char static_id[12], *id;
int c;
int err;
snd_config_t *n = NULL;
snprintf(static_id, sizeof(static_id), "%i", idx);
static_id[sizeof(static_id)-1] = '\0';
id = strdup(static_id);
if (id == NULL)
return -ENOMEM;
c = get_nonwhite(input);
switch (c) {
case '{':
case '[':
{
char endchr;
if (n) {
if (n->type != SND_CONFIG_TYPE_COMPOUND) {
SNDERR("%s is not a compound", id);
err = -EINVAL;
goto __end;
}
} else {
err = _snd_config_make_add(&n, &id, SND_CONFIG_TYPE_COMPOUND, father);
if (err < 0)
goto __end;
}
if (c == '{') {
err = parse_defs(n, input);
endchr = '}';
} else {
err = parse_array_defs(n, input);
endchr = ']';
}
c = get_nonwhite(input);
if (c != endchr) {
snd_config_delete(n);
input->error = (c == EOF ? UNEXPECTED_EOF : UNEXPECTED_CHAR);
err = -EINVAL;
goto __end;
}
break;
}
default:
unget_char(c, input);
err = parse_value(&n, father, input, &id);
if (err < 0)
goto __end;
break;
}
err = 0;
__end:
if (id)
free(id);
return err;
}
static int parse_array_defs(snd_config_t *father, input_t *input)
{
int idx = 0;
while (1) {
int c = get_nonwhite(input);
int err;
if (c == EOF)
return 0;
unget_char(c, input);
if (c == ']')
return 0;
err = parse_array_def(father, input, idx++);
if (err < 0)
return err;
}
return 0;
}
static int parse_def(snd_config_t *father, input_t *input)
{
char *id;
char *id = NULL;
int c;
int err;
snd_config_t *n;
enum {MERGE, NOCREATE, REMOVE} mode;
while (1) {
#if 0
c = get_nonwhite(input);
switch (c) {
#if 0
case '?':
mode = NOCREATE;
break;
case '!':
mode = REMOVE;
break;
#endif
default:
mode = MERGE;
unget_char(c, input);
}
#else
mode = MERGE;
#endif
err = get_string(&id, 1, input);
if (err < 0)
return err;
@ -510,12 +641,12 @@ static int parse_def(snd_config_t *father, input_t *input)
}
if (mode == NOCREATE) {
SNDERR("%s does not exists", id);
free(id);
return -ENOENT;
err = -ENOENT;
goto __end;
}
err = _snd_config_make_add(&n, id, SND_CONFIG_TYPE_COMPOUND, father);
err = _snd_config_make_add(&n, &id, SND_CONFIG_TYPE_COMPOUND, father);
if (err < 0)
return err;
goto __end;
n->u.compound.join = 1;
father = n;
}
@ -526,104 +657,52 @@ static int parse_def(snd_config_t *father, input_t *input)
snd_config_delete(n);
n = NULL;
}
else
free(id);
} else {
n = NULL;
if (mode == NOCREATE) {
SNDERR("%s does not exists", id);
free(id);
return -ENOENT;
err = -ENOENT;
goto __end;
}
}
switch (c) {
case '{':
case '[':
{
char endchr;
if (n) {
if (n->type != SND_CONFIG_TYPE_COMPOUND) {
SNDERR("%s is not a compound", id);
return -EINVAL;
err = -EINVAL;
goto __end;
}
} else {
err = _snd_config_make_add(&n, id, SND_CONFIG_TYPE_COMPOUND, father);
err = _snd_config_make_add(&n, &id, SND_CONFIG_TYPE_COMPOUND, father);
if (err < 0)
return err;
goto __end;
}
err = parse_defs(n, input);
if (err < 0) {
snd_config_delete(n);
return err;
if (c == '{') {
err = parse_defs(n, input);
endchr = '}';
} else {
err = parse_array_defs(n, input);
endchr = ']';
}
c = get_nonwhite(input);
if (c != '}') {
if (c != endchr) {
snd_config_delete(n);
input->error = (c == EOF ? UNEXPECTED_EOF : UNEXPECTED_CHAR);
return -EINVAL;
err = -EINVAL;
goto __end;
}
break;
}
default:
{
char *s;
unget_char(c, input);
err = get_string(&s, 0, input);
err = parse_value(&n, father, input, &id);
if (err < 0)
return err;
if (!err && ((s[0] >= '0' && s[0] <= '9') || s[0] == '-')) {
char *ptr;
long i;
errno = 0;
i = strtol(s, &ptr, 0);
if (*ptr == '.' || errno != 0) {
double r;
errno = 0;
r = strtod(s, &ptr);
if (errno == 0) {
free(s);
if (n) {
if (n->type != SND_CONFIG_TYPE_REAL) {
SNDERR("%s is not a real", id);
return -EINVAL;
}
} else {
err = _snd_config_make_add(&n, id, SND_CONFIG_TYPE_REAL, father);
if (err < 0)
return err;
}
n->u.real = r;
break;
}
} else if (*ptr == '\0') {
free(s);
if (n) {
if (n->type != SND_CONFIG_TYPE_INTEGER) {
SNDERR("%s is not an integer", id);
return -EINVAL;
}
} else {
err = _snd_config_make_add(&n, id, SND_CONFIG_TYPE_INTEGER, father);
if (err < 0)
return err;
}
n->u.integer = i;
break;
}
}
if (n) {
if (n->type != SND_CONFIG_TYPE_STRING) {
SNDERR("%s is not a string", id);
free(s);
return -EINVAL;
}
} else {
err = _snd_config_make_add(&n, id, SND_CONFIG_TYPE_STRING, father);
if (err < 0)
return err;
}
if (n->u.string)
free(n->u.string);
n->u.string = s;
}
goto __end;
break;
}
c = get_nonwhite(input);
switch (c) {
@ -633,6 +712,9 @@ static int parse_def(snd_config_t *father, input_t *input)
default:
unget_char(c, input);
}
__end:
if (id)
free(id);
return err;
}
@ -820,6 +902,33 @@ static int _snd_config_save_leaves(snd_config_t *config, snd_output_t *out, unsi
#endif
/**
* \brief Return type of a config node from an ASCII string
* \param config Config node handle
* \return node type
*/
int snd_config_get_type_ascii(const char *ascii, snd_config_type_t *type)
{
assert(ascii && type);
if (!strcmp(ascii, "integer")) {
*type = SND_CONFIG_TYPE_INTEGER;
return 0;
}
if (!strcmp(ascii, "real")) {
*type = SND_CONFIG_TYPE_REAL;
return 0;
}
if (!strcmp(ascii, "string")) {
*type = SND_CONFIG_TYPE_STRING;
return 0;
}
if (!strcmp(ascii, "compound")) {
*type = SND_CONFIG_TYPE_COMPOUND;
return 0;
}
return -EINVAL;
}
/**
* \brief Return type of a config node
* \param config Config node handle
@ -1012,7 +1121,7 @@ int snd_config_make(snd_config_t **config, const char *id,
return -ENOMEM;
} else
id1 = NULL;
return _snd_config_make(config, id1, type);
return _snd_config_make(config, &id1, type);
}
/**
@ -1233,6 +1342,15 @@ int snd_config_get_ascii(snd_config_t *config, char **ascii)
assert(0);
return -ENOMEM;
}
if (res[0]) { /* trim the string */
char *ptr;
ptr = res + strlen(res) - 1;
while (ptr != res && *ptr == ' ')
ptr--;
if (*ptr != ' ')
ptr++;
*ptr = '\0';
}
*ascii = strdup(res);
}
break;
@ -1268,7 +1386,7 @@ int snd_config_save(snd_config_t *config, snd_output_t *out)
*/
int snd_config_search(snd_config_t *config, const char *key, snd_config_t **result)
{
assert(config && key && result);
assert(config && key);
while (1) {
snd_config_t *n;
int err;
@ -1544,7 +1662,8 @@ typedef enum _snd_config_walk_pass {
} snd_config_walk_pass_t;
/* Return 1 if node need to be attached to father */
/* Return 1 if node needs to be attached to father */
/* Return 2 if compound is replaced with standard node */
typedef int (*snd_config_walk_callback_t)(snd_config_t *src,
snd_config_t **dst,
snd_config_walk_pass_t pass,
@ -1656,86 +1775,6 @@ int snd_config_copy(snd_config_t **dst,
return snd_config_walk(src, dst, _snd_config_copy, NULL);
}
/**
* \brief Expand the dynamic contents
* \param src Source string
* \param idchr Identification character
* \param callback Callback function
* \param private_data Private data for the given callback function
* \param dst Destination string
*/
int snd_config_string_replace(const char *src, char idchr,
snd_config_string_replace_callback_t *callback,
void *private_data,
char **dst)
{
int len = 0, len1, err;
const char *ptr, *end;
char *tmp, *what, *fptr, *rdst = NULL;
assert(src && idchr && dst);
while (*src != '\0') {
ptr = strchr(src, idchr);
end = NULL;
if (ptr == src && *(ptr + 1) == '(' && (end = strchr(ptr + 2, ')')) != NULL) {
src = end + 1;
if (callback == NULL)
continue;
len1 = end - (ptr + 2);
if (len1 == 0) /* empty */
continue;
what = malloc(len1 + 1);
memcpy(what, ptr + 2, len1);
what[len1] = '\0';
fptr = NULL;
err = callback(what, &fptr, private_data);
free(what);
if (err < 0) {
if (*dst != NULL)
free(*dst);
return err;
}
if (fptr == NULL) /* empty */
continue;
len1 = strlen(ptr = fptr);
} else {
if (ptr == NULL) {
len1 = strlen(ptr = src);
} else {
len1 = ptr - src;
ptr = src;
}
src += len1;
fptr = NULL;
}
tmp = realloc(rdst, len + len1 + 1);
if (tmp == NULL) {
if (*dst != NULL)
free(*dst);
return -ENOMEM;
}
memcpy(tmp + len, ptr, len1);
tmp[len+=len1] = '\0';
if (fptr)
free(fptr);
rdst = tmp;
}
*dst = rdst;
return 0;
}
static int _snd_config_expand_replace(const char *what, char **dst, void *private_data)
{
snd_config_t *vars = private_data;
snd_config_t *val;
assert(dst);
if (snd_config_search(vars, what, &val) < 0)
return 0; /* empty */
else
return snd_config_get_ascii(val, dst);
}
static int _snd_config_expand(snd_config_t *src,
snd_config_t **dst,
snd_config_walk_pass_t pass,
@ -1746,12 +1785,14 @@ static int _snd_config_expand(snd_config_t *src,
snd_config_type_t type = snd_config_get_type(src);
switch (pass) {
case SND_CONFIG_WALK_PASS_PRE:
if (strcmp(id, "$") == 0)
{
if (strcmp(id, "args") == 0)
return 0;
err = snd_config_make_compound(dst, id, src->u.compound.join);
if (err < 0)
return err;
break;
}
case SND_CONFIG_WALK_PASS_LEAF:
switch (type) {
case SND_CONFIG_TYPE_INTEGER:
@ -1781,11 +1822,12 @@ static int _snd_config_expand(snd_config_t *src,
const char *s;
snd_config_t *val;
snd_config_t *vars = private_data;
err = snd_config_get_string(src, &s);
if (strncmp(s, "$(", 2) == 0 && s[strlen(s) - 1] == ')') {
char *str = alloca((strlen(s) - 3) + 1);
memcpy(str, s + 2, strlen(s) - 3);
str[strlen(s) - 3] = 0;
snd_config_get_string(src, &s);
if (strncmp(s, "$(", 2) == 0 && s[strlen(s) - 1] == ')') {
int len = strlen(s) - 3;
char *str = alloca(len + 1);
memcpy(str, s + 2, len);
str[len] = '\0';
if (snd_config_search(vars, str, &val) < 0)
return 0;
err = snd_config_copy(dst, val);
@ -1800,22 +1842,10 @@ static int _snd_config_expand(snd_config_t *src,
err = snd_config_make(dst, id, type);
if (err < 0)
return err;
if (strstr(s, "$(") != NULL) {
char *str = NULL;
err = snd_config_string_replace(s, '$', _snd_config_expand_replace, vars, &str);
if (err < 0)
return err;
if (str == NULL) {
snd_config_delete(*dst);
return 0;
}
(*dst)->u.string = str;
} else {
err = snd_config_set_string(*dst, s);
if (err < 0) {
snd_config_delete(*dst);
return err;
}
err = snd_config_set_string(*dst, s);
if (err < 0) {
snd_config_delete(*dst);
return err;
}
}
break;
@ -1830,6 +1860,181 @@ static int _snd_config_expand(snd_config_t *src,
return 1;
}
static int evaluate_node(snd_config_t *father, snd_config_t *src,
void *private_data, snd_config_t **_dst)
{
snd_config_iterator_t i, next;
const char *lib = NULL, *func = NULL, *type = NULL;
int err;
assert(father && src && _dst);
snd_config_for_each(i, next, src) {
snd_config_t *n = snd_config_iterator_entry(i);
const char *id;
if (snd_config_get_type(n) == SND_CONFIG_TYPE_COMPOUND) {
snd_config_t *n1;
err = evaluate_node(src, n, private_data, &n1);
if (err < 0) {
SNDERR("Error in node %s", snd_config_get_id(n));
goto __error;
}
if (n1) { /* replace node */
snd_config_delete(n);
err = snd_config_add(src, n1);
if (err < 0)
goto __error;
}
}
id = snd_config_get_id(n);
if (*id++ != '@') /* quick look */
continue;
if (!strcmp(id, "lib")) {
if ((err = snd_config_get_string(n, &lib)) < 0) {
_invalid_field:
SNDERR("Unknown type of field %s", id);
return err;
}
lib = strdup(lib);
if (lib == NULL)
goto __error;
snd_config_delete(n);
} else if (!strcmp(id, "func")) {
if ((err = snd_config_get_string(n, &func)) < 0)
goto _invalid_field;
func = strdup(func);
if (func == NULL)
goto __error;
snd_config_delete(n);
} else if (!strcmp(id, "type")) {
if ((err = snd_config_get_string(n, &type)) < 0)
goto _invalid_field;
type = strdup(type);
if (type == NULL)
goto __error;
snd_config_delete(n);
}
}
if (func == NULL) {
*_dst = NULL;
return 0;
}
{
char buf[64], *ptr;
snd_config_type_t t;
snd_config_t *dst = NULL;
char *evaluate_name = NULL;
int (*evaluate_func)(char **dst, snd_config_t *src, void *private_data);
void *h;
if (evaluate_name == NULL) {
snprintf(buf, sizeof(buf), "snd_func_%s", func);
buf[sizeof(buf)-1] = '\0';
evaluate_name = buf;
}
h = dlopen(lib, RTLD_NOW);
if (!h) {
SNDERR("Cannot open shared library %s", lib);
return -ENOENT;
}
evaluate_func = dlsym(h, evaluate_name);
if (!evaluate_func) {
dlclose(h);
SNDERR("symbol %s is not defined inside %s", evaluate_name, lib ? lib : ALSA_LIB);
return -ENXIO;
}
err = evaluate_func(&ptr, src, private_data);
dlclose(h);
if (err < 0) {
SNDERR("function %s returned error: %s", evaluate_name, snd_strerror(err));
return err;
}
if (type == NULL) {
t = SND_CONFIG_TYPE_STRING;
} else {
err = snd_config_get_type_ascii(type, &t);
if (err < 0 || t == SND_CONFIG_TYPE_COMPOUND) {
free(ptr);
return -EINVAL;
}
}
err = snd_config_make(&dst, snd_config_get_id(src), t);
if (err < 0) {
free(ptr);
return err;
}
switch (t) {
case SND_CONFIG_TYPE_INTEGER:
{
long v;
err = safe_strtol(ptr, &v);
if (err < 0) {
free(ptr);
snd_config_delete(dst);
return err;
}
snd_config_set_integer(dst, v);
}
break;
case SND_CONFIG_TYPE_REAL:
{
double r;
err = safe_strtod(ptr, &r);
if (err < 0) {
free(ptr);
snd_config_delete(dst);
return err;
}
snd_config_set_real(dst, r);
}
break;
default:
snd_config_set_string(dst, ptr);
break;
}
free(ptr);
*_dst = dst;
}
err = 0;
__error:
if (func)
free((void *)func);
if (lib)
free((void *)lib);
if (type)
free((void *)type);
return err;
}
int snd_config_evaluate(snd_config_t *conf, void *private_data)
{
snd_config_iterator_t i, next;
assert(conf);
snd_config_for_each(i, next, conf) {
snd_config_t *n = snd_config_iterator_entry(i);
if (snd_config_get_type(n) == SND_CONFIG_TYPE_COMPOUND) {
snd_config_t *n1;
int err = evaluate_node(conf, n, private_data, &n1);
if (err < 0) {
SNDERR("Error in node %s", snd_config_get_id(n));
return err;
}
if (n1) { /* replace node */
snd_config_delete(n);
err = snd_config_add(conf, n1);
if (err < 0)
return err;
}
}
}
return 0;
}
static int load_defaults(snd_config_t *subs, snd_config_t *defs)
{
snd_config_iterator_t d, dnext;
@ -2055,6 +2260,8 @@ static int parse_args(snd_config_t *subs, const char *str, snd_config_t *defs)
{
int err;
int arg = 0;
if (str == NULL)
return 0;
skip_blank(&str);
if (!*str)
return 0;
@ -2198,35 +2405,54 @@ static int parse_args(snd_config_t *subs, const char *str, snd_config_t *defs)
}
/**
* \brief Expand a node applying arguments
* \brief Expand a node applying arguments and functions
* \param config Config node handle
* \param args Arguments string
* \param args Arguments string (optional)
* \param private_data Private data for functions
* \param result Pointer to found node
* \return 0 on success otherwise a negative error code
*/
int snd_config_expand(snd_config_t *config, const char *args,
snd_config_t **result)
void *private_data, snd_config_t **result)
{
int err;
snd_config_t *defs, *subs;
err = snd_config_search(config, "$", &defs);
if (err < 0)
return -EINVAL;
err = snd_config_top(&subs);
if (err < 0)
return err;
err = load_defaults(subs, defs);
if (err < 0)
goto _end;
err = parse_args(subs, args, defs);
if (err < 0)
goto _end;
err = snd_config_walk(config, result, _snd_config_expand, subs);
if (err < 0)
snd_config_t *defs, *subs = NULL, *res;
err = snd_config_search(config, "args", &defs);
if (err < 0) {
err = snd_config_copy(&res, config);
if (err < 0)
return err;
} else {
err = snd_config_top(&subs);
if (err < 0)
return err;
err = load_defaults(subs, defs);
if (err < 0) {
SNDERR("Load defaults error: %s", snd_strerror(err));
goto _end;
}
err = parse_args(subs, args, defs);
if (err < 0) {
SNDERR("Parse arguments error: %s", snd_strerror(err));
goto _end;
}
err = snd_config_walk(config, &res, _snd_config_expand, subs);
if (err < 0) {
SNDERR("Expand error (walk): %s", snd_strerror(err));
goto _end;
}
}
err = snd_config_evaluate(res, private_data);
if (err < 0) {
SNDERR("Evaluate error: %s", snd_strerror(err));
snd_config_delete(res);
goto _end;
}
*result = res;
err = 1;
_end:
snd_config_delete(subs);
if (subs)
snd_config_delete(subs);
return err;
}