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wcswidth(3) — Linux manual page

wcswidth(3)              Library Functions Manualwcswidth(3)

NAME        top

       wcswidth - determine columns needed for a fixed-size wide-       character string

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#define _XOPEN_SOURCE/* See feature_test_macros(7) */#include <wchar.h>int wcswidth(const wchar_t *s, size_tn);

DESCRIPTION        top

       Thewcswidth() function returns the number of columns needed to       represent the wide-character string pointed to bys, but at mostn       wide characters.  If a nonprintable wide character occurs among       these characters, -1 is returned.

RETURN VALUE        top

       Thewcswidth() function returns the number of column positions for       the wide-character strings, truncated to at most lengthn.

ATTRIBUTES        top

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

STANDARDS        top

       POSIX.1-2008.

HISTORY        top

       POSIX.1-2001.

NOTES        top

       The behavior ofwcswidth() depends on theLC_CTYPEcategory of the       current locale.

SEE ALSO        top

iswprint(3),wcwidth(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            2025-05-17wcswidth(3)

Pages that refer to this page:wcwidth(3), utf-8(7)

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