118 lines
3.9 KiB
Plaintext
118 lines
3.9 KiB
Plaintext
# Copyright (c) 2020 Nordic Semiconductor ASA
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# SPDX-License-Identifier: Apache-2.0
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choice CBPRINTF_IMPLEMENTATION
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prompt "Capabilities of cbprintf implementation"
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default CBPRINTF_COMPLETE
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config CBPRINTF_COMPLETE
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bool "All selected features"
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help
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Select this for an implementation that supports all potential
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conversions, with Kconfig options to control availability at build
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time.
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# 80: -53% / 982 B (80 / 00)
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config CBPRINTF_NANO
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bool "Space-optimized but feature-limited"
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# nano needs to count characters if it's the formatter for libc
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select CBPRINTF_LIBC_SUBSTS if MINIMAL_LIBC
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help
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If selected a completely different implementation of the core
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formatting capability is substituted. This has a much smaller code
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footprint, but provides fewer capabilities.
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endchoice # CBPRINTF_IMPLEMENTATION
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choice CBPRINTF_INTEGRAL_CONV
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prompt "Control range of convertible integer values"
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default CBPRINTF_FULL_INTEGRAL
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# 01: 0% / 0 B (01 / 00)
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config CBPRINTF_FULL_INTEGRAL
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bool "Convert the full range of integer values"
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help
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Build cbprintf with buffers sized to support converting the full
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range of all integral and pointer values.
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Selecting this has no effect on code size, but will increase call
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stack size by a few words.
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# 00:
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config CBPRINTF_REDUCED_INTEGRAL
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bool "Convert only integer values that fit in 32 bits"
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help
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Build cbprintf with buffers sized to support converting integer
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values with no more than 32 bits.
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This will decrease stack space, but affects conversion of any type
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with more than 32 bits. This includes not only intmax_t but any
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type that can be converted to an integral represention including
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size_t and pointers.
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With CBPRINTF_COMPLETE conversions that may result in value-specific
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truncation are not supported, and the generated text will be the
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specification (e.g. %jd).
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With CBPRINTF_NANO all conversions will be attempted but values that
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cannot fit will be silently truncated.
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endchoice
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# 02: 82% / 1530 B (02 / 00)
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config CBPRINTF_FP_SUPPORT
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bool "Enable floating point formatting in cbprintf"
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default y if FPU
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depends on CBPRINTF_COMPLETE
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help
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Build the cbprintf utility function with support for floating
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point format specifiers. Selecting this increases stack size
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requirements slightly, but increases code size significantly.
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# 04: 13% / 456 B (07 / 03)
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config CBPRINTF_FP_A_SUPPORT
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bool "Enable floating point %a conversions"
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depends on CBPRINTF_FULL_INTEGRAL
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select CBPRINTF_FP_SUPPORT
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help
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The %a hexadecimal format for floating point value conversion was
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added in C99, but the output is not easily understood so it rarely
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appears in application code.
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Selecting this adds support for the conversion, but increases the
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overall code size related to FP support.
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# 40: -15% / -508 B (46 / 06)
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config CBPRINTF_FP_ALWAYS_A
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bool "Select %a format for all floating point specifications"
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select CBPRINTF_FP_A_SUPPORT
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help
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The %a format for floats requires significantly less code than the
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standard decimal representations (%f, %e, %g). Selecting this
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option implicitly uses %a (or %A) for all decimal floating
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conversions. The precision of the original specification is
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ignored.
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Selecting this decreases code size when FP_SUPPORT is enabled.
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# 08: 3% / 60 B (08 / 00)
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config CBPRINTF_N_SPECIFIER
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bool "Support %n specifications"
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depends on CBPRINTF_COMPLETE
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default y
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help
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If selected %n can be used to determine the number of characters
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emitted. If enabled there is a small increase in code size.
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# 180: 18% / 138 B (180 / 80) [NANO]
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config CBPRINTF_LIBC_SUBSTS
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bool "Generate C-library compatible functions using cbprintf"
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help
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If selected wrappers are generated for various C library functions
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using the cbprintf formatter underneath. The wrappers use the C
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library function name with a cb suffix; e.g. printfcb() or
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vsnprintfcb().
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When used with CBPRINTF_NANO this increases the implementation code
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size by a small amount.
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