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Add method 'json_object_to_json_string_length'

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This new method allows to also
get the length of the generated string.

Fix #165

Change-Id: Iea91404027f143ca3d29a4c58d7c07ae53556110
Signed-off-by: José Bollo <jose.bollo@iot.bzh>
This commit is contained in:
jobol
2016-07-26 19:22:25 +02:00
committed by José Bollo
parent 54ae254537
commit 344009bf26
2 changed files with 37 additions and 12 deletions
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39
json_object.c
View File

@@ -295,20 +295,35 @@ void json_object_set_serializer(json_object *jso,
/* extended conversion to string */
const char* json_object_to_json_string_length(struct json_object *jso, int flags, size_t *length)
{
const char *r = NULL;
size_t s = 0;
if (!jso)
{
s = 4;
r = "null";
}
else if ((jso->_pb) || (jso->_pb = printbuf_new()))
{
printbuf_reset(jso->_pb);
if(jso->_to_json_string(jso, jso->_pb, 0, flags) >= 0)
{
s = (size_t)jso->_pb->bpos;
r = jso->_pb->buf;
}
}
if (length)
*length = s;
return r;
}
const char* json_object_to_json_string_ext(struct json_object *jso, int flags)
{
if (!jso)
return "null";
if ((!jso->_pb) && !(jso->_pb = printbuf_new()))
return NULL;
printbuf_reset(jso->_pb);
if(jso->_to_json_string(jso, jso->_pb, 0, flags) < 0)
return NULL;
return jso->_pb->buf;
return json_object_to_json_string_length(jso, flags, NULL);
}
/* backwards-compatible conversion to string */

10
json_object.h
View File

@@ -223,6 +223,16 @@ extern const char* json_object_to_json_string(struct json_object *obj);
extern const char* json_object_to_json_string_ext(struct json_object *obj, int
flags);
/** Stringify object to json format
* @see json_object_to_json_string() for details on how to free string.
* @param obj the json_object instance
* @param flags formatting options, see JSON_C_TO_STRING_PRETTY and other constants
* @param length a pointer where, if not NULL, the length (without null) is stored
* @returns a string in JSON format and the length if not NULL
*/
extern const char* json_object_to_json_string_length(struct json_object *obj, int
flags, size_t *length);
/**
* Returns the userdata set by json_object_set_userdata() or
* json_object_set_serializer()