int wcscoll(const wchar_t *ws1, const wchar_t *ws2);
The wcscoll() function 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.
The wcscoll() function 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(). If errno is non-zero on return, an error has occurred.
Upon successful completion, wcscoll() 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. On error, wcscoll() shall set errno, but no return value is reserved to indicate an error.
The wcscoll() function may fail if:
The ws1 or ws2 arguments contain wide-character codes
outside the domain of the collating sequence.
The following sections are informative.
The wcsxfrm() and wcscmp() functions should be used for sorting large lists.
COPYRIGHTPortions 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 .