NAME

locale.h - category macros

SYNOPSIS

#include <locale.h>

DESCRIPTION

^[CX] Some of the functionality described on this reference page extends the ISO C standard. Applications shall define the appropriate feature test macro (see XSH 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 LC_MONETARY and LC_NUMERIC.)

char    *currency_symbol
char    *decimal_point
char     frac_digits
char    *grouping
char    *int_curr_symbol
char     int_frac_digits
char     int_n_cs_precedes
char     int_n_sep_by_space
char     int_n_sign_posn
char     int_p_cs_precedes
char     int_p_sep_by_space
char     int_p_sign_posn
char    *mon_decimal_point
char    *mon_grouping
char    *mon_thousands_sep
char    *negative_sign
char     n_cs_precedes
char     n_sep_by_space
char     n_sign_posn
char    *positive_sign
char     p_cs_precedes
char     p_sep_by_space
char     p_sign_posn
char    *thousands_sep

The <locale.h> header shall define NULL (as described in <stddef.h>) and at least the following as macros:

LC_ALL
LC_COLLATE
LC_CTYPE
^[CX]
LC_MESSAGES

LC_MONETARY
LC_NUMERIC
LC_TIME

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.

^[CX] 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.

[CX]
locale_t      duplocale(locale_t);
void          freelocale(locale_t);

struct lconv *localeconv(void);
[CX]
locale_t      newlocale(int, const char *, locale_t);

char         *setlocale(int, const char *);
[CX]
locale_t      uselocale (locale_t);

APPLICATION USAGE

None.

RATIONALE

It is suggested that each category macro name for use in setlocale() have a corresponding macro name ending in _MASK for use in newlocale().

FUTURE DIRECTIONS

None.

SEE ALSO

Environment Variables, <stddef.h>

XSH duplocale, freelocale , localeconv, newlocale, setlocale, uselocale

CHANGE HISTORY

First released in Issue 3.

Included for alignment with the ISO C standard.

Issue 6

The lconv structure is expanded with new members (int_n_cs_precedes, int_n_sep_by_space, int_n_sign_posn, int_p_cs_precedes, int_p_sep_by_space, and int_p_sign_posn) for alignment with the ISO/IEC 9899:1999 standard.

Extensions beyond the ISO C standard are marked.

Issue 7

The duplocale(), freelocale(), newlocale(), and uselocale() functions are added from The Open Group Technical Standard, 2006, Extended API Set Part 4.

This reference page is clarified with respect to macros and symbolic constants.

POSIX.1-2008, Technical Corrigendum 1, XBD/TC1-2008/0060 [301,427] is applied.

POSIX.1-2008, Technical Corrigendum 2, XBD/TC2-2008/0062 [781] is applied.