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c4f8cc34df
smalls strings inside json_objects had a high overhead because dynamic memory allocation was needed for each of them. This also meant that the pointer needed to be updated. This is now changed so that small strings can directly be stored inside the json_object. Note that on the regular 64 bit machines a pointer takes 8 bytes. So even without increasing memory, we could store string up to 7 bytes directly inside the object. The max size is configurable. I have selected up to 31 bytes (which means a buffer of 32 including the NUL byte). This brings a 24-bytes memory overhead, but I consider that still useful because the memory allocator usually also has quite some overhead (16 bytes) for dyn alloced memory blocks. In any case, the max buffer size can be tweaked via #define.
json-c
Building on Unix with git, gcc and autotools
Home page for json-c: https://github.com/json-c/json-c/wiki
Caution: do NOT use sources from svn.metaparadigm.com, they are old.
Prerequisites:
gcc,clang, or another C compilerlibtool
If you're not using a release tarball, you'll also need:
autoconf(autoreconf)automake
Make sure you have a complete libtool install, including libtoolize.
json-c GitHub repo: https://github.com/json-c/json-c
$ git clone https://github.com/json-c/json-c.git
$ cd json-c
$ sh autogen.sh
followed by
$ ./configure
$ make
$ make install
To build and run the test programs:
$ make check
Linking to libjson-c
If your system has pkgconfig,
then you can just add this to your makefile:
CFLAGS += $(shell pkg-config --cflags json-c)
LDFLAGS += $(shell pkg-config --libs json-c)
Without pkgconfig, you would do something like this:
JSON_C_DIR=/path/to/json_c/install
CFLAGS += -I$(JSON_C_DIR)/include/json-c
LDFLAGS+= -L$(JSON_C_DIR)/lib -ljson-c