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<meta http-equiv="X-UA-Compatible" content="IE=9"/>
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<meta name="generator" content="Doxygen 1.8.8"/>
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<title>json-c: `json-c`</title>
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<link href="tabs.css" rel="stylesheet" type="text/css"/>
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json-c
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0.13.1
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Main Page
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Related Pages
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Data Structures
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Files
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`json-c`
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Overview and Build Status
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Building on Unix
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Install Prerequisites
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Building with partial threading support
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Linking to libjson-c
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Using json-c
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JSON-C - A JSON implementation in C
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Build Status
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AppVeyor Build
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![AppVeyor Build Status]()
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Travis Build
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![Travis Build Status]()
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JSON-C implements a reference counting object model that allows you to easily construct JSON objects in C, output them as JSON formatted strings and parse JSON formatted strings back into the C representation of JSON objects. It aims to conform to RFC 7159.
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Building on Unix with git, gcc and autotools
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Home page for json-c: https://github.com/json-c/json-c/wiki
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Prerequisites:
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See also the "Installing prerequisites" section below.
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gcc, clang, or another C compiler
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libtool>=2.2.6b
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If you're not using a release tarball, you'll also need:
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autoconf>=2.64 (autoreconf)
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automake>=1.13
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Make sure you have a complete libtool install, including libtoolize.
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To generate docs (e.g. as part of make distcheck) you'll also need:
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doxygen>=1.8.13
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Build instructions:
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json-c GitHub repo: https://github.com/json-c/json-c
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```sh $ git clone https://github.com/json-c/json-c.git $ cd json-c $ sh autogen.sh ```
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followed by
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```sh $ ./configure # –enable-threading $ make $ make install ```
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To build and run the test programs:
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```sh $ make check $ make USE_VALGRIND=0 check # optionally skip using valgrind ```
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Install prerequisites
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If you are on a relatively modern system, you'll likely be able to install the prerequisites using your OS's packaging system.
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Install using apt (e.g. Ubuntu 16.04.2 LTS)
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```sh sudo apt install git sudo apt install autoconf automake libtool sudo apt install valgrind # optional ```
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Then start from the "git clone" command, above.
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Manually install and build autoconf, automake and libtool
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For older OS's that don't have up-to-date version of the packages will require a bit more work. For example, CentOS release 5.11, etc...
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```sh curl -O http://ftp.gnu.org/gnu/autoconf/autoconf-2.69.tar.gz curl -O http://ftp.gnu.org/gnu/automake/automake-1.15.tar.gz curl -O http://ftp.gnu.org/gnu/libtool/libtool-2.2.6b.tar.gz
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tar xzf autoconf-2.69.tar.gz tar xzf automake-1.15.tar.gz tar xzf libtool-2.2.6b.tar.gz
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export PATH=${HOME}/ac_install/bin:$PATH
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(cd autoconf-2.69 && \ ./configure –prefix ${HOME}/ac_install && \ make && \ make install)
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(cd automake-1.15 && \ ./configure –prefix ${HOME}/ac_install && \ make && \ make install)
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(cd libtool-2.2.6b && \ ./configure –prefix ${HOME}/ac_install && \ make && \ make install) ```
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Building with partial threading support
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Although json-c does not support fully multi-threaded access to object trees, it has some code to help make use in threaded programs a bit safer. Currently, this is limited to using atomic operations for json_object_get() and json_object_put().
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Since this may have a performance impact, of at least 3x slower according to https://stackoverflow.com/a/11609063, it is disabled by default. You may turn it on by adjusting your configure command with: –enable-threading
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Separately, the default hash function used for object field keys, lh_char_hash, uses a compare-and-swap operation to ensure the randomly seed is only generated once. Because this is a one-time operation, it is always compiled in when the compare-and-swap operation is available.
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Linking to libjson-c
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If your system has pkgconfig, then you can just add this to your makefile:
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```make CFLAGS += $(shell pkg-config –cflags json-c) LDFLAGS += $(shell pkg-config –libs json-c) ```
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Without pkgconfig, you would do something like this:
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```make JSON_C_DIR=/path/to/json_c/install CFLAGS += -I/include/json-c LDFLAGS+= -L/lib -ljson-c ```
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Using json-c
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To use json-c you can either include json.h, or preferrably, one of the following more specific header files:
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json_object.h - Core types and methods.
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json_tokener.h - Methods for parsing and serializing json-c object trees.
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json_pointer.h - JSON Pointer (RFC 6901) implementation for retrieving objects from a json-c object tree.
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json_object_iterator.h - Methods for iterating over single json_object instances.
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json_visit.h - Methods for walking a tree of json-c objects.
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json_util.h - Miscelleanous utility functions.
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For a full list of headers see files.html
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<address class="footer"><small>
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Generated on Mon Mar 5 2018 23:17:09 for json-c by
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1.8.8
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</small></address>
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</body>
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</html>
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