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77 lines
2.9 KiB
ReStructuredText
77 lines
2.9 KiB
ReStructuredText
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.. highlight:: c
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******************
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Upgrading from 1.x
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******************
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This chapter lists the backwards incompatible changes introduced in
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Jansson 2.0, and the steps that are needed for upgrading your code.
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**The incompatibilities are not dramatic.** The biggest change is that
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all decoding functions now require and extra parameter. Most programs
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can be modified to work with 2.0 by adding a ``0`` as the second
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parameter to all calls of :func:`json_loads()`, :func:`json_loadf()`
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and :func:`json_load_file()`.
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Compatibility
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=============
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Jansson 2.0 is backwards incompatible with the Jansson 1.x releases.
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It is ABI incompatible, i.e. all programs dynamically linking to the
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Jansson library need to be recompiled. It's also API incompatible,
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i.e. the source code of programs using Jansson 1.x may need
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modifications to make them compile against Jansson 2.0.
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All the 2.x releases are guaranteed to be backwards compatible for
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both ABI and API, so no recompilation or source changes are needed
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when upgrading from 2.x to 2.y.
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List of Incompatible Changes
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============================
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**Decoding flags**
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For future needs, a ``flags`` parameter was added as the second
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parameter to all decoding functions, i.e. :func:`json_loads()`,
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:func:`json_loadf()` and :func:`json_load_file()`. All calls to
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these functions need to be changed by adding a ``0`` as the second
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argument. For example::
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/* old code */
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json_loads(input, &error);
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/* new code */
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json_loads(input, 0, &error);
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**Underlying type of JSON integers**
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The underlying C type of JSON integers has been changed from
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:type:`int` to the widest available signed integer type, i.e.
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:type:`long long` or :type:`long`, depending on whether
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:type:`long long` is supported on your system or not. This makes
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the whole 64-bit integer range available on most modern systems.
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``jansson.h`` has a typedef :type:`json_int_t` to the underlying
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integer type. :type:`int` should still be used in most cases when
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dealing with smallish JSON integers, as the compiler handles
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implicit type coercion. Only when the full 64-bit range is needed,
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:type:`json_int_t` should be explicitly used.
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**Maximum encoder indentation depth**
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The maximum argument of the ``JSON_INDENT()`` macro has been
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changed from 255 to 31, to free up bits from the ``flags``
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parameter of :func:`json_dumps()`, :func:`json_dumpf()` and
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:func:`json_dump_file()`. If your code uses a bigger indentation
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than 31, it needs to be changed.
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**Unsigned integers in API functions**
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Version 2.0 unifies unsigned integer usage in the API. All uses of
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:type:`unsigned int` and :type:`unsigned long` have been replaced
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with :type:`size_t`. This includes flags, container sizes, etc.
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This should not require source code changes, as both
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:type:`unsigned int` and :type:`unsigned long` are usually
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compatible with :type:`size_t`.
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