The Open Group Base Specifications Issue 8
IEEE Std 1003.1-2024
Copyright © 2001-2024 The 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] 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.1-2024 defers to the ISO C standard. [Option End]

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.

[CX] [Option Start] The wcsspn() function shall not change the setting of errno on valid input. [Option End]

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.

Issue 8

Austin Group Defect 448 is applied, adding a requirement that wcsspn() does not change the setting of errno on valid input.

End of informative text.

 

return to top of page

UNIX® is a registered Trademark of The Open Group.
POSIX™ is a Trademark of The IEEE.
Copyright © 2001-2024 The IEEE and The Open Group, All Rights Reserved
[ Main Index | XBD | XSH | XCU | XRAT ]