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
wcsspn - get the length of a wide substring
SYNOPSIS
#include <wchar.h>
size_t wcsspn(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 wcsspn() 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 from the wide-character string pointed to by
ws2.
RETURN VALUE
The wcsspn() 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
wcscspn
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 wcsspn() returns the length of ws1 rather that ws1
itself.
End of informative text.
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