langinfo (0p) - Linux Manuals

langinfo: language information constants


This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.


langinfo.h --- language information constants


#include <langinfo.h>


The <langinfo.h> header shall define the symbolic constants used to identify items of langinfo data (see nl_langinfo()).

The <langinfo.h> header shall define the locale_t type as described in <locale.h>.

The <langinfo.h> header shall define the nl_item type as described in <nl_types.h>.

The <langinfo.h> header shall define the following symbolic constants with type nl_item. The entries under Category indicate in which setlocale() category each item is defined.


CODESET LC_CTYPE Codeset name.
D_T_FMT LC_TIME String for formatting date and time.
D_FMT LC_TIME Date format string.
T_FMT LC_TIME Time format string.
T_FMT_AMPM LC_TIME a.m. or p.m. time format string.
AM_STR LC_TIME Ante-meridiem affix.
PM_STR LC_TIME Post-meridiem affix.
DAY_1 LC_TIME Name of the first day of the week (for example, Sunday).
DAY_2 LC_TIME Name of the second day of the week (for example, Monday).
DAY_3 LC_TIME Name of the third day of the week (for example, Tuesday).
DAY_4 LC_TIME Name of the fourth day of the week

 (for example, Wednesday).
DAY_5 LC_TIME Name of the fifth day of the week (for example, Thursday).
DAY_6 LC_TIME Name of the sixth day of the week (for example, Friday).
DAY_7 LC_TIME Name of the seventh day of the week

 (for example, Saturday).
ABDAY_1 LC_TIME Abbreviated name of the first day of the week.
ABDAY_2 LC_TIME Abbreviated name of the second day of the week.
ABDAY_3 LC_TIME Abbreviated name of the third day of the week.
ABDAY_4 LC_TIME Abbreviated name of the fourth day of the week.
ABDAY_5 LC_TIME Abbreviated name of the fifth day of the week.
ABDAY_6 LC_TIME Abbreviated name of the sixth day of the week.
ABDAY_7 LC_TIME Abbreviated name of the seventh day of the week.
MON_1 LC_TIME Name of the first month of the year.
MON_2 LC_TIME Name of the second month.
MON_3 LC_TIME Name of the third month.
MON_4 LC_TIME Name of the fourth month.
MON_5 LC_TIME Name of the fifth month.
MON_6 LC_TIME Name of the sixth month.
MON_7 LC_TIME Name of the seventh month.
MON_8 LC_TIME Name of the eighth month.
MON_9 LC_TIME Name of the ninth month.
MON_10 LC_TIME Name of the tenth month.
MON_11 LC_TIME Name of the eleventh month.
MON_12 LC_TIME Name of the twelfth month.
ABMON_1 LC_TIME Abbreviated name of the first month.
ABMON_2 LC_TIME Abbreviated name of the second month.
ABMON_3 LC_TIME Abbreviated name of the third month.
ABMON_4 LC_TIME Abbreviated name of the fourth month.
ABMON_5 LC_TIME Abbreviated name of the fifth month.
ABMON_6 LC_TIME Abbreviated name of the sixth month.
ABMON_7 LC_TIME Abbreviated name of the seventh month.
ABMON_8 LC_TIME Abbreviated name of the eighth month.
ABMON_9 LC_TIME Abbreviated name of the ninth month.
ABMON_10 LC_TIME Abbreviated name of the tenth month.
ABMON_11 LC_TIME Abbreviated name of the eleventh month.
ABMON_12 LC_TIME Abbreviated name of the twelfth month.
ERA LC_TIME Era description segments.
ERA_D_FMT LC_TIME Era date format string.
ERA_D_T_FMT LC_TIME Era date and time format string.
ERA_T_FMT LC_TIME Era time format string.
ALT_DIGITS LC_TIME Alternative symbols for digits.
THOUSEP LC_NUMERIC Separator for thousands.
YESEXPR LC_MESSAGES Affirmative response expression.
NOEXPR LC_MESSAGES Negative response expression.
CRNCYSTR LC_MONETARY  Local currency symbol, preceded by '-' if the symbol should appear before the value, '+' if the symbol should appear after the value, or '.' if the symbol should replace the radix character. If the local currency symbol is the empty string, implementations may return the empty string ("").

If the locale's values for p_cs_precedes and n_cs_precedes do not match, the value of nl_langinfo(CRNCYSTR) and nl_langinfo_l(CRNCYSTR,loc) is unspecified.

The following shall be declared as a function and may also be defined as a macro. A function prototype shall be provided.

char *nl_langinfo(nl_item);
char *nl_langinfo_l(nl_item, locale_t);

Inclusion of the <langinfo.h> header may also make visible all symbols from <nl_types.h>.

The following sections are informative.


Wherever possible, users are advised to use functions compatible with those in the ISO C standard to access items of langinfo data. In particular, the strftime() function should be used to access date and time information defined in category LC_TIME. The localeconv() function should be used to access information corresponding to RADIXCHAR, THOUSEP, and CRNCYSTR.






Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see .


Chapter 7, Locale, <locale.h>, <nl_types.h>

The System Interfaces volume of POSIX.1-2008, nl_langinfo(), localeconv(), strfmon(), strftime()