locale.h − category macros
Some of the functionality described on this reference page extends the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.
The <locale.h> header shall provide a definition for lconv structure, which shall include at least the following members. (See the definitions of LC_MONETARY in LC_MONETARY and LC_NUMERIC .)
The <locale.h> header shall define NULL (as defined in <stddef.h> ) and at least the following as macros:
which shall expand to distinct integer constant expressions, 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 given here.
The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.
char *setlocale(int, const char *);
The following sections are informative.
The System Interfaces volume of IEEE Std 1003.1-2001, localeconv(), setlocale(), Environment Variables
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .