STPNCPY(3)                          Linux Programmer's Manual                          STPNCPY(3)



NAME
       stpncpy - copy a fixed-size string, returning a pointer to its end

SYNOPSIS
       #include <string.h>

       char *stpncpy(char *dest, const char *src, size_t n);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       stpncpy():
           Since glibc 2.10:
               _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
           Before glibc 2.10:
               _GNU_SOURCE

DESCRIPTION
       The  stpncpy()  function  copies  at  most n characters from the string pointed to by src,
       including the terminating null byte ('\0'), to the array pointed to by  dest.   Exactly  n
       characters  are written at dest.  If the length strlen(src) is smaller than n, the remain‐
       ing characters in the array pointed to by dest are filled with null bytes ('\0'),  If  the
       length  strlen(src)  is greater than or equal to n, the string pointed to by dest will not
       be null-terminated.

       The strings may not overlap.

       The programmer must ensure that there is room for at least n characters at dest.

RETURN VALUE
       stpncpy() returns a pointer to the terminating null byte in dest, or, if dest is not null-
       terminated, dest+n.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The stpncpy() function is thread-safe.

CONFORMING TO
       This  function  was added to POSIX.1-2008.  Before that, it was a GNU extension.  It first
       appeared in version 1.07 of the GNU C library in 1993.

SEE ALSO
       strncpy(3), wcpncpy(3)

COLOPHON
       This page is part of release 3.74 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at http://www.kernel.org/doc/man-pages/.



GNU                                         2014-05-10                                 STPNCPY(3)