langinfo.h(0P) POSIX Programmer's Manual langinfo.h(0P)PROLOG
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NAMElanginfo.h — language information constants
SYNOPSIS
#include <langinfo.h>
DESCRIPTION
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 setlo‐
cale() category each item is defined.
┌───────────┬───────────┬───────────────────────────────────────────────────────────┐
│ Constant │ Category │ Meaning │
├───────────┼───────────┼───────────────────────────────────────────────────────────┤
│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. │
│RADIXCHAR │LC_NUMERIC │Radix character. │
│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(CRN‐
CYSTR,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.
APPLICATION USAGE
Wherever possible, users are advised to use functions compatible with
those in the ISO C standard to access items of langinfo data. In par‐
ticular, 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.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
Chapter 7, Locale, <locale.h>, <nl_types.h>
The System Interfaces volume of POSIX.1‐2008, nl_langinfo(), locale‐
conv(), strfmon(), strftime()COPYRIGHT
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 Electri‐
cal 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 http://www.unix.org/online.html .
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 https://www.ker‐
nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 langinfo.h(0P)
