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.
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.1‐2008, Section2.2, 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,
char *currency_symbolchar *decimal_pointchar frac_digitschar *groupingchar *int_curr_symbolchar int_frac_digitschar int_n_cs_precedeschar int_n_sep_by_spacechar int_n_sign_posnchar int_p_cs_precedeschar int_p_sep_by_spacechar int_p_sign_posnchar *mon_decimal_pointchar *mon_groupingchar *mon_thousands_sepchar *negative_signchar n_cs_precedeschar n_sep_by_spacechar n_sign_posnchar *positive_signchar p_cs_precedeschar p_sep_by_spacechar p_sign_posnchar *thousands_sep
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.
Implementations may add additional masks using the form LC_* and an
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
Implementations may add additional masks using the form LC_*_MASK.
In addition, a macro to set the bits for all categories set shall be
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
The following shall be declared as functions and may also be defined
as macros. Function prototypes shall be provided for use with ISO C
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.
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) 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.unix.org/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
IEEE/The Open Group 2013 locale.h(0P)