nuttx/libs/libc/string/Kconfig

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#
# For a description of the syntax of this configuration file,
# see the file kconfig-language.txt in the NuttX tools repository.
#
menu "errno Decode Support"
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 not
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.
endmenu # errno Decode Support
menu "memcpy/memset Options"
config MEMCPY_VIK
bool "Vik memcpy()"
default n
depends on !LIBC_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 # MEMCPY_VIK
config MEMSET_OPTSPEED
bool "Optimize memset() for speed"
default n
depends on !LIBC_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.
endmenu # memcpy/memset Options