STRNCPY(P) POSIX Programmer's Manual STRNCPY(P)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.
NAMEstrncpy - 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 implementa‐
tions. 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 ALSOstrcpy() , the Base Definitions volume of IEEE Std 1003.1-2001,
<string.h>
COPYRIGHT
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 .
IEEE/The Open Group 2003 STRNCPY(P)
