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locale.h — category macros
Some of the functionality described on this reference page extends the ISO C standard. Applications shall define the appropriate feature test macro (see the System Interfaces volume of POSIX.1-2017, Section 2.2, The Compilation Environment) to enable the visibility of these symbols in this header.
The <locale.h> header shall define the lconv structure, which shall include at least the following members. (See the definitions of LC_MONETARY in Section 7.3.3, LC_MONETARY and Section 7.3.4, LC_NUMERIC.)
The <locale.h> header shall define NULL (as described in <stddef.h>) and at least the following as macros:
which shall expand to integer constant expressions with distinct values for use as the first argument to the setlocale() function.
Additional macro definitions, beginning with the characters LC_ and an uppercase letter, may also be specified by the implementation.
The <locale.h> header shall contain at least the following macros representing bitmasks for use with the newlocale() function for each supported locale category: LC_COLLATE_MASK LC_CTYPE_MASK LC_MESSAGES_MASK LC_MONETARY_MASK LC_NUMERIC_MASK LC_TIME_MASK
In addition, a macro to set the bits for all categories set shall be defined: LC_ALL_MASK
The <locale.h> header shall define LC_GLOBAL_LOCALE, a special locale object descriptor used by the duplocale() and uselocale() functions.
The <locale.h> header shall define the locale_t type, representing a locale object.
The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided for use with ISO C standard compilers.
struct lconv *localeconv(void);
locale_t newlocale(int, const char *, locale_t);
char *setlocale(int, const char *);
locale_t uselocale (locale_t);
The following sections are informative.
It is suggested that each category macro name for use in setlocale() have a corresponding macro name ending in _MASK for use in newlocale().
Chapter 8, Environment Variables, <stddef.h>
The System Interfaces volume of POSIX.1-2017, duplocale(), freelocale(), localeconv(), newlocale(), setlocale(), uselocale()
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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