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#include <langinfo.h>
The <langinfo.h> header contains the constants used to identify items of langinfo data (see nl_langinfo(3C)). The type of the constant, nl_item, is defined as described in <nl_types.h>.
The following constants are defined. The entries under Category indicate in which setlocale(3C) 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 seventh 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 |
| YESSTR LC_MESSAGES affirmative response for yes/no queries |
| NOSTR LC_MESSAGES negative response ro yes/no queries |
| 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 locale's values for p_cs_precedes and n_cs_precedes do not match, the value of nl_langinfo(CRNCYSTR) is unspecified.
The <langinfo.h> header declares the following as a function:
char *nl_langinfo(nl_item);
Inclusion of <langinfo.h> header may also make visible all symbols from <nl_types.h>.
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(3C) function should be used to access date and time information defined in category LC_TIME. The localeconv(3C) function should be used to access information corresponding to RADIXCHAR, THOUSEP, and CRNCYSTR.
See attributes(7) for descriptions of the following attributes:
| ATTRIBUTE TYPE ATTRIBUTE VALUE |
| Interface Stability Standard |
mkmsgs (1), localeconv (3C), nl_langinfo (3C), setlocale (3C), strftime (3C), nl_types.h (3HEAD), attributes (7), standards (7)