PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult the corresponding Linux manual page for details of Linux behavior), or the  interface
       may not be implemented on Linux.

NAME

       stpncpy, strncpy — copy fixed length string, returning a pointer to the array end

SYNOPSIS

       #include <string.h>

       char *stpncpy(char *restrict s1, const char *restrict s2, size_t n);
       char *strncpy(char *restrict s1, const char *restrict s2, size_t n);

DESCRIPTION

       For strncpy(): 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.1‐2008 defers to the ISO C standard.

       The stpncpy() and strncpy() functions shall copy not more than n bytes (bytes that follow a NUL character
       are not copied) from the array pointed to by s2 to the array pointed to by s1.

       If the array pointed to by s2 is a string that is shorter than n bytes, NUL characters shall be  appended
       to the copy in the array pointed to by s1, until n bytes in all are written.

       If copying takes place between objects that overlap, the behavior is undefined.

RETURN VALUE

       If  a NUL character is written to the destination, the stpncpy() function shall return the address of the
       first such NUL character.  Otherwise, it shall return &s1[n].

       The strncpy() function shall return s1.

       No return values are reserved to indicate an error.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       Applications must provide the space in s1 for the n bytes to be transferred, as well as ensure  that  the
       s2 and s1 arrays do not overlap.

       Character  movement  is  performed  differently in different implementations. Thus, overlapping moves may
       yield surprises.

       If there is no NUL character byte in the first n bytes of the array pointed to by s2, the result  is  not
       null-terminated.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       strcpy(), wcsncpy()

       The Base Definitions volume of POSIX.1‐2008, <string.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open  Group  Base
       Specifications  Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc
       and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In  the  event
       of  any  discrepancy between this version and the original IEEE and The Open Group Standard, the original
       IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at
       http://www.unix.org/online.html .

       Any  typographical  or formatting errors that appear in this page are most likely to have been introduced
       during  the  conversion  of  the  source  files  to  man  page  format.  To  report  such   errors,   see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .