STRNCPY(3POSIX)             POSIX Programmer's Manual            STRNCPY(3POSIX)

       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.

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

       #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);

       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

       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.

       No errors are defined.

       The following sections are informative.


       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.



       strcpy(), wcsncpy()

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

       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 .

       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 .

IEEE/The Open Group                   2013                       STRNCPY(3POSIX)