Section: POSIX Programmer's Manual (3P)
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.
--- wide-character string comparison using collating information
int wcscoll(const wchar_t *ws1, const wchar_t *ws2);
int wcscoll_l(const wchar_t *ws1, const wchar_t *ws2,
The functionality described on this reference page is aligned with the
ISO C standard. Any conflict between the requirements described here and the
ISO C standard is unintentional. This volume of POSIX.1-2008 defers to the ISO C standard.
functions shall compare the wide-character string pointed to by
to the wide-character string pointed to by
both interpreted as appropriate to the
category of the current locale,
or the locale represented by
functions shall not change the setting of
An application wishing to check for error situations should set
to 0 before calling
is non-zero on return, an error has occurred.
The behavior is undefined if the
is the special locale object LC_GLOBAL_LOCALE or is not a valid locale
Upon successful completion,
shall return an integer greater than, equal to, or less than 0,
according to whether the wide-character string pointed to by
is greater than, equal to, or less than the wide-character string
pointed to by
when both are interpreted as appropriate to the current locale,
or to the locale represented by
respectively. On error,
but no return value is reserved to indicate an error.
These functions may fail if:
arguments contain wide-character codes outside the domain of the
The following sections are informative.
functions should be used for sorting large lists.
The Base Definitions volume of POSIX.1-2008,
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
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