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.
For wcscoll(): 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.
The wcscoll() and wcscoll_l() functions shall compare the wide-
character string pointed to by ws1 to the wide-character string
pointed to by ws2, both interpreted as appropriate to the LC_COLLATE
category of the current locale, or the locale represented by locale,
The wcscoll() and wcscoll_l() functions shall not change the setting
of errno if successful.
An application wishing to check for error situations should set errno
to 0 before calling wcscoll() or wcscoll_l(). If errno is non-zero
on return, an error has occurred.
The behavior is undefined if the locale argument to wcscoll_l() is
the special locale object LC_GLOBAL_LOCALE or is not a valid locale
Upon successful completion, wcscoll() and wcscoll_l() shall return an
integer greater than, equal to, or less than 0, according to whether
the wide-character string pointed to by ws1 is greater than, equal
to, or less than the wide-character string pointed to by ws2, when
both are interpreted as appropriate to the current locale, or to the
locale represented by locale, respectively. On error, wcscoll() and
wcscoll_l() shall set errno, but no return value is reserved to
indicate an error.
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 WCSCOLL(3P)