Copyright 2014 Garrett D'Amore <garrett@damore.org>
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#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 loc);
int wscoll(const wchar_t *ws1, const wchar_t *ws2);
The wcscoll(), wcscoll_l(), and wscoll() functions 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 locale category.
These functions do not change the setting of errno if successful.
An application wanting to check for error situations should set errno to 0 before calling these functions. If errno is non-zero on return, an error has occurred.
The function wcsoll_l() behaves identically to wcsoll(), except instead of operating in the current locale, it operates in the locale specified by loc.
Upon successful completion, these functions return an integer greater than, equal to, or less than 0, depending upon 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 the locale specified by loc. On error, they set errno, but no return value is reserved to indicate an error.
The wcscoll(), wcscoll_l() and wscoll() functions may fail if: EINVAL
The ws1 or ws2 arguments contain wide character codes outside the domain of the collating sequence.
The wcsxfrm(3C) and wcscmp(3C) functions should be used for sorting large lists, or when performing many comparisons on the same strings.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE ATTRIBUTE VALUE |
| CSI Enabled |
| Interface Stability See below. |
| MT-Level MT-Safe |
The wcscoll() and wcscoll_l() functions are Standard. The wscoll() function is Committed.
newlocale(3C), setlocale(3C), uselocale(3C), wcscmp(3C), wcsxfrm(3C), attributes(5), standards(5)