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abfd749335
This is a minimal wrapper around jsmn.h to make things a bit easier for iterating through a JSON object. To use, first parse the JSON and create a contents object using json_contents_new(). This object can then be used to initialize a json_iter object using json_iter_init(). The json_iter object can then be parsed with json_iter_parse by passing in JSON_MANDATORY/JSON_OPTIONAL arguments. Currently only JSON_STRING and JSON_OBJECT types are supported. Any JSON_MANDATORY values that are not found will result in an error. If a JSON_OPTIONAL string is not found, the pointer will be NULL. If a JSON_OPTIONAL object is not found, this iterator will be initialized but 'start' will be -1. This can be checked with a convenience macro json_object_not_found();
84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2021 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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struct json_iter;
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/*
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* Identical to JSMN types
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*/
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enum json_type {
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JSON_UNDEFINED = 0,
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JSON_OBJECT = 1,
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JSON_ARRAY = 2,
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JSON_STRING = 3,
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JSON_PRIMITIVE = 4
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};
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enum json_flag {
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JSON_FLAG_MANDATORY = 1,
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JSON_FLAG_OPTIONAL = 2,
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};
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struct json_iter {
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struct json_contents *contents;
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int start;
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int count;
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};
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#define JSON_MANDATORY(key, type, out) \
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(type), (key), (out), JSON_FLAG_MANDATORY
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#define JSON_OPTIONAL(key, type, out) \
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(type), (key), (out), JSON_FLAG_OPTIONAL
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#define json_iter_is_valid(iter) ((iter)->start != -1)
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struct json_contents *json_contents_new(const char *json, size_t json_len);
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void json_contents_free(struct json_contents *c);
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void json_iter_init(struct json_iter *iter, struct json_contents *c);
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/*
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* Parse an arbitrary number of key/value pairs from a JSON iterator. Initially
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* a new JSON contents object should be created with json_contents_new() and,
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* when done, freed with json_contents_free.
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*
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* Iterators can be initialized with the json_contents object. Nested object
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* iterators are also parsed with this function.
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*
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* Arguments should be specified using JSON_MANDATORY or JSON_OPTIONAL:
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*
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* r = json_iter_parse(iter, JSON_MANDATORY("mykey", JSON_STRING, &strvalue),
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* JSON_OPTIONAL("optkey", JSON_STRING, &optvalue),
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* JSON_UNDEFINED);
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*
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* String values should be of type char ** and must be freed
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* Object values should be of type struct json_iter *
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*
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* No other types are supported at this time, and json_iter_parse will fail if
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* other types are encountered.
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*
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* JSON_OPTIONAL string values will point to NULL if not found
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* JSON_OPTIONAL objects can be checked with json_object_not_found.
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*/
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bool json_iter_parse(struct json_iter *iter, enum json_type type, ...);
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