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
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.
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_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.
Chapter 7, Locale, <locale.h>, <nl_types.h>
The System Interfaces volume of POSIX.1-2017, nl_langinfo(), localeconv(), strfmon(), strftime()
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. 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.opengroup.org/unix/online.html .
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