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lib: introduce the yang_dnode_iterate helper

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Implement helper function that iterates over data nodes that satisfy
XPath query.

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>
This commit is contained in:
Renato Westphal 2019-11-07 16:55:18 -03:00 committed by Rafael Zalamena
parent ff94358e54
commit 7b611145c8
2 changed files with 48 additions and 0 deletions
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26
lib/yang.c
View file

@ -448,6 +448,32 @@ bool yang_dnode_exists(const struct lyd_node *dnode, const char *xpath_fmt, ...)
return found;
}
void yang_dnode_iterate(yang_dnode_iter_cb cb, void *arg,
const struct lyd_node *dnode, const char *xpath_fmt,
...)
{
va_list ap;
char xpath[XPATH_MAXLEN];
struct ly_set *set;
va_start(ap, xpath_fmt);
vsnprintf(xpath, sizeof(xpath), xpath_fmt, ap);
va_end(ap);
set = lyd_find_path(dnode, xpath);
assert(set);
for (unsigned int i = 0; i < set->number; i++) {
int ret;
dnode = set->set.d[i];
ret = (*cb)(dnode, arg);
if (ret == YANG_ITER_STOP)
return;
}
ly_set_free(set);
}
bool yang_dnode_is_default(const struct lyd_node *dnode, const char *xpath_fmt,
...)
{

22
lib/yang.h
View file

@ -107,6 +107,9 @@ enum yang_iter_flags {
/* Callback used by the yang_snodes_iterate_*() family of functions. */
typedef int (*yang_iterate_cb)(const struct lys_node *snode, void *arg);
/* Callback used by the yang_dnode_iterate() function. */
typedef int (*yang_dnode_iter_cb)(const struct lyd_node *dnode, void *arg);
/* Return values of the 'yang_iterate_cb' callback. */
#define YANG_ITER_CONTINUE 0
#define YANG_ITER_STOP -1
@ -357,6 +360,25 @@ extern struct lyd_node *yang_dnode_get(const struct lyd_node *dnode,
extern bool yang_dnode_exists(const struct lyd_node *dnode,
const char *xpath_fmt, ...);
/*
* Iterate over all libyang data nodes that satisfy an XPath query.
*
* cb
* Function to call with each data node.
*
* arg
* Arbitrary argument passed as the second parameter in each call to 'cb'.
*
* dnode
* Base libyang data node to operate on.
*
* xpath_fmt
* XPath expression (absolute or relative).
*/
void yang_dnode_iterate(yang_dnode_iter_cb cb, void *arg,
const struct lyd_node *dnode, const char *xpath_fmt,
...);
/*
* Check if the libyang data node contains a default value. Non-presence
* containers are assumed to always contain a default value.