Also, be sure the right locale_t is freed if we fail on the second uselocale.
Finally, fix test_locale so it *doesn't* use json_object_to_json_string as
 that will simple re-emit the original parsed string values.

initialize null terminator of new printbuf

It's possible (e.g. by using json_object_from_file() on an empty file)
to get json-c to try to use a printbuf that has never had anything
written to it. Before this change, it could access a string that
should be length zero, but was never initialized, and could
theoretically have an unexpected string.

Fix issues with the test script so it works under distcheck too.

linkhash.c: optimised the table_free path

Add tests and descriptions for the functions in json_util.c

To better distinguish between entry->k and entry->v being const within linkhash, but non-const outside, add lh_entry_v() and lh_entry_k() accessors.
Make lh_entry->k const.

Cause README.md to show up in Doxygen output as the main page.

tests/tests1: fix printf format for size_t arguments

Change %d to %llu and add cast to unsigned long long for size_t arguments,
otherwise compilation will fail with errors like:

test1.c:70:15: error: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘size_t {aka long unsigned int}’ [-Werror=format=]

%zu is avoided to stay compatible with old libc versions (like old Visual
Studio).

Also, fix the types of the variables when building on Windows.
Also, should address issue #214.

Use stdint.h to check for size_t size

Include stddef.h in json_object.h

Add public API to use userdata independently of custom serializer

svn.metaparadigm.com no longer exists so it is not possible to use source from there.

Also, json_object_set_serializer is changed to respect the userdata
and user_delete parameters when to_string_func is NULL.

The user might want to use the userdata for something different, so the
serializer should ignore it by default.

Explicitly setting the serializer to json_object_double_to_json_string will
still make it interpret the userdata as a format string.

It is needed for size_t.

If we use json_inttypes.h we are going to fail when builddir != srcdir,
and since JSON_C_HAVE_INTTYPES_H is defined after the configure script
has run, including json_inttypes.h would be the equivalent on including
stdint.h anyway.

This fixes the build of json-c in the GNOME Continuous builder.

Make serialization format of doubles configurable

configure: check realloc with AC_CHECK_FUNCS() to fix cross-compilation.

Use a macro to indicate C99 to the compiler

Fix various potential null ptr deref and int32 overflows

Add utility function for comparing json_objects

Fix issue #221: JSON_C_TO_STRING_NOSLASHESCAPE works incorrectly

Clarify json_object_get_string documentation of NULL handling & return

Tests added.

Do some basic checks on ints, doubles, strings, arrays and "complex" objects.