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wcsspn(3) — Linux manual page

wcsspn(3)                Library Functions Manualwcsspn(3)

NAME        top

       wcsspn - get length of a prefix wide-character substring

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <wchar.h>size_t wcsspn(const wchar_t *wcs, const wchar_t *accept);

DESCRIPTION        top

       Thewcsspn() function is the wide-character equivalent of thestrspn(3) function.  It determines the length of the longest       initial segment ofwcs which consists entirely of wide-characters       listed inaccept.  In other words, it searches for the first       occurrence in the wide-character stringwcs of a wide-character       not contained in the wide-character stringaccept.

RETURN VALUE        top

       Thewcsspn() function returns the number of wide characters in the       longest initial segment ofwcs which consists entirely of wide-       characters listed inaccept.  In other words, it returns the       position of the first occurrence in the wide-character stringwcs       of a wide-character not contained in the wide-character stringaccept, orwcslen(wcs) if there is none.

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │wcsspn()                             │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS        top

       C11, POSIX.1-2008.

HISTORY        top

       POSIX.1-2001, C99.

SEE ALSO        top

strspn(3),wcscspn(3)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17wcsspn(3)

Pages that refer to this page:strspn(3), wcscspn(3), signal-safety(7)

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