mirror of
https://github.com/apache/nuttx.git
synced 2026-08-03 13:19:01 +00:00
116a325763
This adds 3 configuration options for the lib_strftime, which can be used to save flash memory when all the formatters are not needed by an embedded application. There is always a minimal set of formatters supported: "%a, %b/%h, %d, %H, %m, %M, %S, %Y, %%". To add on top of that one can specify: - LIBC_STRFTIME_C_STANDARD_FORMATS : All ISO-C conversion specifiers - LIBC_STRFTIME_POSIX_FORMATS : Additional posix formats - LIBC_STRFTIME_NONSTANDARD_FORMATS : Additional GNU nonstandard formats All of these are enabled by default unless building for CONFIG_DEFAULT_SMALL. Disabling these options can save over 3KB of flash on an 32-bit ARM system, when all the format specifiers are not needed. Signed-off-by: Jukka Laitinen <jukka.laitinen@tii.ae>
106 lines
3.4 KiB
Text
106 lines
3.4 KiB
Text
#
|
|
# For a description of the syntax of this configuration file,
|
|
# see the file kconfig-language.txt in the NuttX tools repository.
|
|
#
|
|
|
|
menu "Time/Time Zone Support"
|
|
|
|
config LIBC_STRFTIME_C_STANDARD_FORMATS
|
|
bool "strftime ISO C conversion specifiers"
|
|
default !DEFAULT_SMALL
|
|
---help---
|
|
Enable ISO C strftime conversion specifiers that are not part of
|
|
the small always-enabled subset. Disabling this option
|
|
removes support for %A, %B, %I, %j, %p, %U, %w, %W, %x, %X, and
|
|
%y. The always-enabled subset is %a, %b/%h, %d, %H, %m, %M,
|
|
%S, %Y, and %%.
|
|
|
|
Disabling this option makes strftime smaller, but the implementation
|
|
no longer supports all conversion specifiers required by ISO C.
|
|
|
|
config LIBC_STRFTIME_POSIX_FORMATS
|
|
bool "strftime POSIX conversion specifiers"
|
|
default !DEFAULT_SMALL
|
|
depends on LIBC_STRFTIME_C_STANDARD_FORMATS
|
|
---help---
|
|
Enable POSIX strftime conversion specifiers beyond ISO C that are
|
|
implemented by NuttX. Disabling this option removes support for
|
|
%C, %e, %F, %g, %G, %n, %r, %R, %t, %T, %u, %V, and %z.
|
|
Enabling this option also enables the ISO C conversion specifiers.
|
|
|
|
Note that %h is kept in the always-enabled subset as an alias for
|
|
%b because it shares the same implementation. Some POSIX
|
|
specifiers may be controlled by other options.
|
|
|
|
config LIBC_STRFTIME_NONSTANDARD_FORMATS
|
|
bool "strftime non-standard conversion specifiers"
|
|
default !DEFAULT_SMALL
|
|
---help---
|
|
Enable NuttX/GNU-style strftime conversion specifiers that are not
|
|
required by ISO C or POSIX. Disabling this option removes support
|
|
for %k, %l, %P, and %s.
|
|
|
|
config LIBC_LOCALTIME
|
|
bool "localtime API call support"
|
|
default "n"
|
|
depends on !DISABLE_ENVIRON
|
|
---help---
|
|
localtime API call support
|
|
|
|
Logic currently depends on file system support with, at a minimum, these
|
|
files in the zoneinfo directory: GMT and posixrules. An additional
|
|
timezone file is required for any additional, local time zone(s) and the
|
|
environment variable TZ must be set to the name of that timezone file
|
|
when tzset() is called.
|
|
|
|
See https://www.iana.org/time-zones . See also libs/libc/zoneinfo
|
|
which provides a framework for incorporating the TZ database into a
|
|
NuttX build.
|
|
|
|
if LIBC_LOCALTIME
|
|
|
|
config LIBC_TZ_MAX_TIMES
|
|
int "Maximum number of times in timezone"
|
|
default 370
|
|
---help---
|
|
Timezone files with more than this number of times will not be used
|
|
(timecnt).
|
|
|
|
Warning: Some files in IANA TZ database include many times. The current
|
|
posixrules file, for example, has timecnt = 236. The value of
|
|
TX_MAX_ITMES in the tzfile.h header file on my Linux system is 370, the
|
|
default used here. You may want to reduce this value for a smaller
|
|
footprint.
|
|
|
|
config LIBC_TZ_MAX_TYPES
|
|
int "Maximum number of TZ types"
|
|
default 20
|
|
---help---
|
|
Maximum number of local time types. You may want to reduce this value
|
|
for a smaller footprint.
|
|
|
|
config LIBC_TZDIR
|
|
string "zoneinfo directory path"
|
|
default "/etc/zoneinfo"
|
|
---help---
|
|
This is the full path to the location where the TZ database is expected
|
|
to be found.
|
|
|
|
config LIBC_ZONEINFO
|
|
bool "TZ database"
|
|
default n
|
|
---help---
|
|
Download and build the TZ/Olson database.
|
|
|
|
if LIBC_ZONEINFO
|
|
|
|
config LIBC_ZONEINFO_ROMFS
|
|
bool "Build ROMFS filesystem"
|
|
default n
|
|
depends on FS_ROMFS
|
|
---help---
|
|
Build a mountable ROMFS filesystem containing the TZ/Olson database
|
|
|
|
endif # LIBC_ZONEINFO
|
|
endif # LIBC_LOCALTIME
|
|
endmenu # Time/Time Zone Support
|