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+#
+# For a description of the syntax of this configuration file,
+# see misc/tools/kconfig-language.txt.
+#
+
+config STDIO_BUFFER_SIZE
+	int "C STDIO buffer size"
+	default 64
+	---help---
+		Size of buffers using within the C buffered I/O interfaces.
+		(printf, putchar, fwrite, etc.).
+
+config STDIO_LINEBUFFER
+	bool "STDIO line buffering"
+	default y
+	---help---
+		Flush buffer I/O whenever a newline character is found in
+		the output data stream.
+
+config NUNGET_CHARS
+	int "Number unget() characters"
+	default 2
+	---help---
+		Number of characters that can be buffered by ungetc() (Only if NFILE_STREAMS > 0)
+
+config LIB_HOMEDIR
+	string "Home directory"
+	default "/"
+	depends on !DISABLE_ENVIRON
+	---help---
+		The home directory to use with operations like such as 'cd ~'
+
+source libc/math/Kconfig
+
+config NOPRINTF_FIELDWIDTH
+	bool "Disable sprintf support fieldwidth"
+	default n
+	---help---
+	sprintf-related logic is a
+	little smaller if we do not support fieldwidthes
+
+config LIBC_FLOATINGPOINT
+	bool "Enable floating point in printf"
+	default n
+	---help---
+		By default, floating point
+		support in printf, sscanf, etc. is disabled.
+
+choice
+	prompt "Newline Options"
+	default EOL_IS_EITHER_CRLF
+	---help---
+		This selection determines the line terminating character that is used.
+		Some environments may return CR as end-of-line, others LF, and others
+		both.  If not specified, the default is either CR or LF (but not both)
+		as the line terminating charactor.
+
+config EOL_IS_CR
+	bool "EOL is CR"
+
+config EOL_IS_LF
+	bool "EOL is LF"
+
+config EOL_IS_BOTH_CRLF
+	bool "EOL is CR and LF"
+
+config EOL_IS_EITHER_CRLF
+	bool "EOL is CR or LF"
+
+endchoice
+
+config LIBC_STRERROR
+	bool "Enable strerror"
+	default n
+	---help---
+		strerror() is useful because it decodes 'errno' values into a human readable
+		strings.  But it can also require a lot of memory.  If this option is selected,
+		strerror() will still exist in the build but it will not decode error values.
+		This option should be used by other logic to decide if it should use strerror()
+		or not.  For example, the NSH application will not use strerror() if this
+		option is not selected; perror() will not use strerror() is this option is not
+		selected (see also NSH_STRERROR).
+
+config LIBC_STRERROR_SHORT
+	bool "Use short error descriptions in strerror()"
+	default n
+	depends on LIBC_STRERROR
+	---help---
+		If this option is selected, then strerror() will use a shortened string when
+		it decodes the error.  Specifically, strerror() is simply use the string that
+		is the common name for the error.  For example, the 'errno' value of 2 will
+		produce the string "No such file or directory" is LIBC_STRERROR_SHORT
+		is not defined but the string "ENOENT" is LIBC_STRERROR_SHORT is defined.
+
+config LIBC_PERROR_STDOUT
+	bool "perror() to stdout"
+	default n
+	---help---
+		POSIX requires that perror() provide its output on stderr.  This option may
+		be defined, however, to provide perror() output that is serialized with
+		other stdout messages.
+
+config ARCH_LOWPUTC
+	bool "Low-level console output"
+	default "y"
+	---help---
+		architecture supports low-level, boot time console output
+
+config LIB_SENDFILE_BUFSIZE
+	int "sendfile() buffer size"
+	default 512
+	---help---
+		Size of the I/O buffer to allocate in sendfile().  Default: 512b
+
+config ARCH_ROMGETC
+	bool "Support for ROM string access"
+	default n
+	---help---
+		In Harvard architectures, data accesses and instruction accesses
+		occur on different busses, perhaps concurrently.  All data accesses
+		are performed on the data bus unless special machine instructions
+		are used to read data from the instruction address space.  Also, in
+		the typical MCU, the available SRAM data memory is much smaller that
+		the non-volatile FLASH instruction memory.  So if the application
+		requires many constant strings, the only practical solution may be
+		to store those constant strings in FLASH memory where they can only
+		be accessed using architecture-specific machine instructions.
+
+		If ARCH_ROMGETC is defined, then the architecture logic must export
+		the function up_romgetc().  up_romgetc() will simply read one byte
+		of data from the instruction space.
+
+		If ARCH_ROMGETC, certain C stdio functions are effected: (1) All
+		format strings in printf, fprintf, sprintf, etc. are assumed to lie
+		in FLASH (string arguments for %s are still assumed to reside in SRAM).
+		And (2), the string argument to puts and fputs is assumed to reside
+		in FLASH.  Clearly, these assumptions may have to modified for the
+		particular needs of your environment.  There is no "one-size-fits-all"
+		solution for this problem.
+
+config ARCH_OPTIMIZED_FUNCTIONS
+	bool "Enable arch optimized functions"
+	default n
+	---help---
+		Allow for architecture optimized implementations of certain library
+		functions.  Architecture-specific implementations can improve overall
+		system performance.
+
+if ARCH_OPTIMIZED_FUNCTIONS
+config ARCH_MEMCPY
+	bool "memcpy()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of memcpy().
+
+config MEMCPY_VIK
+	bool "Vik memcpy()"
+	default n
+	depends on !ARCH_MEMCPY
+	---help---
+		Select this option to use the optimized memcpy() function by Daniel Vik.
+		Select this option for improved performance at the expense of increased
+		size. See licensing information in the top-level COPYING file.
+
+if MEMCPY_VIK
+config MEMCPY_PRE_INC_PTRS
+	bool "Pre-increment pointers"
+	default n
+	---help---
+		Use pre-increment of pointers. Default is post increment of pointers.
+
+config MEMCPY_INDEXED_COPY
+	bool "Array indexing"
+	default y
+	---help---
+		Copying data using array indexing. Using this option, disables the
+		MEMCPY_PRE_INC_PTRS option.
+
+config MEMCPY_64BIT
+	bool "64-bit memcpy()"
+	default n
+	---help---
+		Compiles memcpy() for architectures that suppport 64-bit operations
+		efficiently.
+
+endif
+
+config ARCH_MEMCMP
+	bool "memcmp()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of memcmp().
+
+config ARCH_MEMMOVE
+	bool "memmove()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of memmove().
+
+config ARCH_MEMSET
+	bool "memset()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of memset().
+
+config MEMSET_OPTSPEED
+	bool "Optimize memset() for speed"
+	default n
+	depends on !ARCH_MEMSET
+	---help---
+		Select this option to use a version of memcpy() optimized for speed.
+		Default: memcpy() is optimized for size.
+
+config MEMSET_64BIT
+	bool "64-bit memset()"
+	default n
+	depends on MEMSET_OPTSPEED
+	---help---
+		Compiles memset() for architectures that suppport 64-bit operations
+		efficiently.
+
+config ARCH_STRCHR
+	bool "strchr()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of strchr().
+
+config ARCH_STRCMP
+	bool "strcmp()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of strcmp().
+
+config ARCH_STRCPY
+	bool "strcpy()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of strcpy().
+
+config ARCH_STRNCPY
+	bool "strncpy()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of strncpy().
+
+config ARCH_STRLEN
+	bool "strlen"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of strlen().
+
+config ARCH_STRNLEN
+	bool "strlen()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of strnlen().
+
+config ARCH_BZERO
+	bool "bzero()"
+	default n
+	---help---
+		Select this option if the architecture provides an optimized version
+		of bzero().
+
+endif