trusty (3) strncpy.3posix.gz

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NAME
       strncpy - copy part of a string


SYNOPSIS
       #include <string.h>

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


DESCRIPTION
       The  strncpy()  function  shall copy not more than n bytes (bytes that follow a null byte are not copied)
       from the array pointed to by s2 to the array pointed to by s1.  If copying takes  place  between  objects
       that overlap, the behavior is undefined.

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


RETURN VALUE
       The strncpy() function shall return s1; no return value is reserved to indicate an error.


ERRORS
       No errors are defined.

       The following sections are informative.


EXAMPLES
       None.


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

       If  there  is  no  null  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() , the Base Definitions volume of IEEE Std 1003.1-2001, <string.h>


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers,
       Inc  and  The  Open Group. 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.opengroup.org/unix/online.html .