The Open Group Base Specifications Issue 7, 2018 edition
IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)
Copyright © 2001-2018 IEEE and The Open Group
NAME
wcscspn - get the length of a complementary wide substring
SYNOPSIS
#include <wchar.h>
size_t wcscspn(const wchar_t *ws1, const wchar_t *ws2);
DESCRIPTION
[CX] ![[Option Start]](../images/opt-start.gif)
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.
![[Option End]](../images/opt-end.gif)
The wcscspn() function shall compute the length (in wide characters) of the maximum initial segment of the wide-character
string pointed to by ws1 which consists entirely of wide-character codes not from the wide-character string pointed
to by ws2.
RETURN VALUE
The wcscspn() function shall return the length of the initial substring of ws1; no return value is reserved to
indicate an error.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
wcsspn
XBD <wchar.h>
CHANGE HISTORY
First released in Issue 4. Derived from the MSE working draft.
Issue 5
The RETURN VALUE section is updated to indicate that wcscspn() returns the length of ws1, rather than ws1
itself.
End of informative text.
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