fc37c02eb1
Up to now, the handling of type float was offloaded to the users of the
JSON utility, with the token JSON_TOK_FLOAT.
Improve handling of floating point types and support the types 'float'
and 'double' in a built-in way so that they can be directly parsed to
and serialized from variables (of type float or double).
The types are serialized in the shortest representation, either as a
decimal number or in scientific notation:
* float (with JSON_TOK_FLOAT_FP): encoded with maximal 9 digits
* double (with JSON_TOK_DOUBLE_FP): encoded with maximal 16 digits
* NaN, Infinity, -Infinity: encoded and decoded as:
{"nan_val":NaN,"inf_pos":Infinity,"inf_neg":-Infinity}
Enable the floating point functionality with the Kconfig option:
JSON_LIBRARY_FP_SUPPORT=y
It requires a libc implementation with support for floating point
functions: strtof(), strtod(), isnan() and isinf().
Fixes: #59412
Signed-off-by: Christoph Winklhofer <cj.winklhofer@gmail.com>
85 lines
2.4 KiB
Plaintext
85 lines
2.4 KiB
Plaintext
# Copyright (c) 2016 Intel Corporation
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# SPDX-License-Identifier: Apache-2.0
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menu "Utility Library"
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config JSON_LIBRARY
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bool "Build JSON library"
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help
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Build a minimal JSON parsing/encoding library. Used by sample
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applications such as the NATS client.
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config JSON_LIBRARY_FP_SUPPORT
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bool "Floating point support in JSON library"
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depends on JSON_LIBRARY
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select CBPRINTF_FP_SUPPORT
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select REQUIRES_FULL_LIBC
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help
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Build the JSON library with support for floating point types.
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Requires a libc implementation with support for floating point
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functions: strtof(), strtod(), isnan() and isinf().
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config RING_BUFFER
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bool "Ring buffers"
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help
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Provide highly efficient ring buffer management for arbitrary data.
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Some facilities such as kernel pipes are built on top of this.
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May be used directly e.g. when the pipe overhead is unnecessary.
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config RING_BUFFER_LARGE
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bool "Allow large ring buffer sizes"
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depends on RING_BUFFER
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help
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Increase maximum buffer size from 32KB to 2GB. When this is enabled,
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all struct ring_buf instances become 12 bytes bigger.
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config NOTIFY
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bool "Asynchronous Notifications"
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help
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Use this API to support async transactions.
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config BASE64
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bool "Base64 encoding and decoding"
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help
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Enable base64 encoding and decoding functionality
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config ONOFF
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bool "On-Off Manager"
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select NOTIFY
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help
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An on-off manager supports an arbitrary number of clients of a
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service which has a binary state. Example applications are power
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rails, clocks, and binary device power management.
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config WINSTREAM
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bool "Lockless shared memory window byte stream"
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help
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Winstream is a byte stream IPC for use in shared memory
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"windows", generally for transmit to non-Zephyr contexts that
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can't share Zephyr APIs or data structures.
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if WINSTREAM
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config WINSTREAM_STDLIB_MEMCOPY
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bool "Use standard memcpy() in winstream"
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help
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The sys_winstream utility is sometimes used in early boot
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environments before the standard library is usable. By
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default it uses a simple internal bytewise memcpy(). Set
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this to use the one from the standard library.
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endif
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config UTF8
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bool "UTF-8 string operation supported"
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help
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Enable the utf8 API. The API implements functions to specifically
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handle UTF-8 encoded strings.
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config COBS
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bool "Consistent overhead byte stuffing"
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select NET_BUF
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help
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Enable consistent overhead byte stuffing
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endmenu
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