PROLOG

       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.

NAME

       locale.h — category macros

SYNOPSIS

       #include <locale.h>

DESCRIPTION

       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.)

           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
       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.

       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.

           locale_t      duplocale(locale_t);
           void          freelocale(locale_t);
           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.

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

       Chapter 8, Environment Variables, <stddef.h>

       The System Interfaces volume of  POSIX.1‐2017,  duplocale(),  freelocale(),  localeconv(),
       newlocale(), setlocale(), uselocale()

COPYRIGHT

       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 .

       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.kernel.org/doc/man-pages/reporting_bugs.html .