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wcpncpy(3) — Linux manual page

wcpncpy(3)               Library Functions Manualwcpncpy(3)

NAME        top

       wcpncpy - copy a fixed-size string of wide characters, returning a       pointer to its end

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <wchar.h>wchar_t *wcpncpy(size_t n;wchar_tdest[restrictn],const wchar_t *restrictsrc,size_tn);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):wcpncpy():           Since glibc 2.10:               _POSIX_C_SOURCE >= 200809L           Before glibc 2.10:               _GNU_SOURCE

DESCRIPTION        top

       Thewcpncpy() function is the wide-character equivalent of thestpncpy(3) function.  It copies at mostn wide characters from the       wide-character string pointed to bysrc, including the terminating       null wide (L'\0'), to the array pointed to bydest.  Exactlyn       wide characters are written atdest.  If the lengthwcslen(src) is       smaller thann, the remaining wide characters in the array pointed       to bydest are filled with L'\0' characters.  If the lengthwcslen(src) is greater than or equal ton, the string pointed to       bydest will not be L'\0' terminated.       The strings may not overlap.       The programmer must ensure that there is room for at leastn wide       characters atdest.

RETURN VALUE        top

wcpncpy() returns a pointer to one past the last non-null wide       character written, that is,dest + wcsnlen(src, n).

ATTRIBUTES        top

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

STANDARDS        top

       POSIX.1-2008.

SEE ALSO        top

stpncpy(3),wcsncpy(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            2025-07-11wcpncpy(3)

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

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