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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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WCSCOLL(3P) POSIX Programmer's Manual WCSCOLL(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.
wcscoll, wcscoll_l — wide-character string comparison using
collating information
#include <wchar.h>
int wcscoll(const wchar_t *ws1, const wchar_t *ws2);
int wcscoll_l(const wchar_t *ws1, const wchar_t *ws2,
locale_t locale);
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.1‐2017 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, respectively.
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 object handle.
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.
These functions may fail if:
EINVAL The ws1 or ws2 arguments contain wide-character codes
outside the domain of the collating sequence.
The following sections are informative.
None.
The wcsxfrm() and wcscmp() functions should be used for sorting
large lists.
None.
None.
wcscmp(3p), wcsxfrm(3p)
The Base Definitions volume of POSIX.1‐2017, wchar.h(0p)
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 .
IEEE/The Open Group 2017 WCSCOLL(3P)
Pages that refer to this page: wchar.h(0p), setlocale(3p), wcsxfrm(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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