rt-thread/src/klibc/Kconfig

menu "klibc options"
    menu "rt_vsnprintf options"
        config RT_KLIBC_USING_LIBC_VSNPRINTF
            bool "Enable rt_vsnprintf to use libc vsscanf"
            default n

        config RT_KLIBC_USING_VSNPRINTF_LONGLONG
            bool "Enable rt_vsnprintf function to support long-long format"
            depends on !RT_KLIBC_USING_LIBC_VSNPRINTF
            default n
                help
                    Support for the long long integral types (with the ll, z and t length modifiers for specifiers
                    %d,%i,%o,%x,%X,%u, and with the %p specifier). Note: 'L' (long double) is not supported.

        menuconfig RT_KLIBC_USING_VSNPRINTF_STANDARD
            bool "Enable standard rt_vsnprintf version"
            default y if ARCH_CPU_64BIT
            default n
            select RT_KLIBC_USING_VSNPRINTF_LONGLONG
            depends on !RT_KLIBC_USING_LIBC_VSNPRINTF
            help
                Standard version of rt_vsnprintf, which is full function but higher stack usage.

        if RT_KLIBC_USING_VSNPRINTF_STANDARD

            config RT_KLIBC_USING_VSNPRINTF_DECIMAL_SPECIFIERS
                bool "Support decimal notation floating point conversion specifiers (%f, %F)"
                default y
                help
                    Support for the decimal notation floating point conversion specifiers (%f, %F)

            config RT_KLIBC_USING_VSNPRINTF_EXPONENTIAL_SPECIFIERS
                bool "Support exponential notation floating point conversion specifiers (%e, %g, %E, %G)"
                default y
                help
                    Support for the exponential notation floating point conversion specifiers (%e, %g, %E, %G)

            config RT_KLIBC_USING_VSNPRINTF_WRITEBACK_SPECIFIER
                bool "Support length write-back specifier (%n)"
                default y
                help
                    Support for the length write-back specifier (%n)

            config RT_KLIBC_USING_VSNPRINTF_CHECK_NUL_IN_FORMAT_SPECIFIER
                bool "safety check: no NULL end string"
                default y if RT_USING_DEBUG
                default n
                help
                    Be extra-safe, and don't assume format specifiers are completed correctly
                    before the format string end.

            config RT_KLIBC_USING_VSNPRINTF_MSVC_STYLE_INTEGER_SPECIFIERS
                bool "Support MSVC style integer specifiers"
                default n
                help
                    the integer format specifiers used in Microsoft's Visual C++ (MSVC) compiler.
                    These specifiers, like %I64d for 64-bit integers, deviate slightly from the standard
                    C format specifiers and are specific to MSVC. They allow for controlled formatting of
                    integers in printf()-like functions, accommodating different integer sizes and ensuring
                    compatibility with MSVC's environment. It's important to note that these specifiers might
                    not be recognized or function in other compilers due to their MSVC-specific nature.

            config RT_KLIBC_USING_VSNPRINTF_INTEGER_BUFFER_SIZE
                int "'ntoa' conversion buffer size"
                default 32
                help
                    'ntoa' conversion buffer size, this must be big enough to hold one converted
                    numeric number including padded zeros (dynamically created on stack)

            config RT_KLIBC_USING_VSNPRINTF_DECIMAL_BUFFER_SIZE
                int "printing individual decimal numbers buffer size"
                default 32
                help
                    size of the fixed (on-stack) buffer for printing individual decimal numbers.
                    this must be big enough to hold one converted floating-point value including
                    padded zeros.

            config RT_KLIBC_USING_VSNPRINTF_FLOAT_PRECISION
                int "floating point conversion specifiers"
                default 6
                help
                    Default precision for the floating point conversion specifiers (the C standard sets this at 6)

            config RT_KLIBC_USING_VSNPRINTF_MAX_INTEGRAL_DIGITS_FOR_DECIMAL
                int "integral nums printed as float in rt_vsnprint"
                default 9
                help
                    According to the C languages standard, printf() and related functions must be able to print any
                    integral number in floating-point notation, regardless of length, when using the %f specifier -
                    possibly hundreds of characters, potentially overflowing your buffers. In this implementation,
                    all values beyond this threshold are switched to exponential notation.

            config RT_KLIBC_USING_VSNPRINTF_LOG10_TAYLOR_TERMS
                int "the number of terms in a Taylor series expansion of log_10(x)"
                default 4
                range 2 99
                help
                    The number of terms in a Taylor series expansion of log_10(x) to
                    use for approximation - including the power-zero term (i.e. the
                    value at the point of expansion).

        endif
    endmenu # rt_vsnprintf options

    menu "rt_vsscanf options"
        config RT_KLIBC_USING_LIBC_VSSCANF
            bool "Enable rt_vsscanf to use libc vsscanf"
            default n
    endmenu # rt_vsscanf options

    menu "rt_memset options"
        config RT_KLIBC_USING_USER_MEMSET
            bool "Enable rt_memset to use user-defined version"
            default n

        if !RT_KLIBC_USING_USER_MEMSET
            config RT_KLIBC_USING_LIBC_MEMSET
                bool "Enable rt_memset to use libc memset"
                default n

            config RT_KLIBC_USING_TINY_MEMSET
                bool "Enable rt_memset to use tiny version"
                depends on !RT_KLIBC_USING_LIBC_MEMSET
                default n
        endif
    endmenu # rt_memset options

    menu "rt_memcpy options"
        config RT_KLIBC_USING_USER_MEMCPY
            bool "Enable rt_memcpy to use user-defined version"
            default n

        if !RT_KLIBC_USING_USER_MEMCPY
            config RT_KLIBC_USING_LIBC_MEMCPY
                bool "Enable rt_memcpy to use libc memcpy"
                default n

            config RT_KLIBC_USING_TINY_MEMCPY
                bool "Enable rt_memcpy to use tiny version"
                depends on !RT_KLIBC_USING_LIBC_MEMCPY
                default n
        endif
    endmenu # rt_memcpy options

    menu "rt_memmove options"
        config RT_KLIBC_USING_USER_MEMMOVE
            bool "Enable rt_memmove to use user-defined version"
            default n

        if !RT_KLIBC_USING_USER_MEMMOVE
            config RT_KLIBC_USING_LIBC_MEMMOVE
                bool "Enable rt_memmove to use libc memmove"
                default n
        endif
    endmenu # rt_memmove options

    menu "rt_memcmp options"
        config RT_KLIBC_USING_USER_MEMCMP
            bool "Enable rt_memcmp to use user-defined version"
            default n

        if !RT_KLIBC_USING_USER_MEMCMP
            config RT_KLIBC_USING_LIBC_MEMCMP
                bool "Enable rt_memcmp to use libc memcmp"
                default n
        endif
    endmenu # rt_memcmp options

    menu "rt_strstr options"
        config RT_KLIBC_USING_USER_STRSTR
            bool "Enable rt_strstr to use user-defined version"
            default n

        if !RT_KLIBC_USING_USER_STRSTR
            config RT_KLIBC_USING_LIBC_STRSTR
                bool "Enable rt_strstr to use libc strstr"
                default n
        endif
    endmenu # rt_strstr options

    menu "rt_strcasecmp options"
        config RT_KLIBC_USING_USER_STRCASECMP
            bool "Enable rt_strcasecmp to use user-defined version"
            default n
    endmenu # rt_strcasecmp options

    menu "rt_strncpy options"
        config RT_KLIBC_USING_USER_STRNCPY
            bool "Enable rt_strncpy to use user-defined version"
            default n

        if !RT_KLIBC_USING_USER_STRNCPY
            config RT_KLIBC_USING_LIBC_STRNCPY
                bool "Enable rt_strncpy to use libc strncpy"
                default n
        endif
    endmenu # rt_strncpy options

    menu "rt_strcpy options"
        config RT_KLIBC_USING_USER_STRCPY
            bool "Enable rt_strcpy to use user-defined version"
            default n

        if !RT_KLIBC_USING_USER_STRCPY
            config RT_KLIBC_USING_LIBC_STRCPY
                bool "Enable rt_strcpy to use libc strcpy"
                default n
        endif
    endmenu # rt_strcpy options

    menu "rt_strncmp options"
        config RT_KLIBC_USING_USER_STRNCMP
            bool "Enable rt_strncmp to use user-defined version"
            default n

        if !RT_KLIBC_USING_USER_STRNCMP
            config RT_KLIBC_USING_LIBC_STRNCMP
                bool "Enable rt_strncmp to use libc strncmp"
                default n
        endif
    endmenu # rt_strncmp options

    menu "rt_strcmp options"
        config RT_KLIBC_USING_USER_STRCMP
            bool "Enable rt_strcmp to use user-defined version"
            default n

        if !RT_KLIBC_USING_USER_STRCMP
            config RT_KLIBC_USING_LIBC_STRCMP
                bool "Enable rt_strcmp to use libc strcmp"
                default n
        endif
    endmenu # rt_strcmp options

    menu "rt_strlen options"
        config RT_KLIBC_USING_USER_STRLEN
            bool "Enable rt_strlen to use user-defined version"
            default n

        if !RT_KLIBC_USING_USER_STRLEN
            config RT_KLIBC_USING_LIBC_STRLEN
                bool "Enable rt_strlen to use libc strlen"
                default n
        endif
    endmenu # rt_strlen options

    menu "rt_strnlen options"
        config RT_KLIBC_USING_USER_STRNLEN
            bool "Enable rt_strnlen to use user-defined version"
            default n
    endmenu # rt_strnlen options
endmenu