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-.\"     $OpenBSD: strncpy.3,v 1.2 2014/04/19 11:30:40 deraadt Exp $
-.\"
-.\" Copyright (c) 1990, 1991 The Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" Chris Torek and the American National Standards Committee X3,
-.\" on Information Processing Systems.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.Dd $Mdocdate: April 19 2014 $
-.Dt STRNCPY 3
-.Os
-.Sh NAME
-.Nm strncpy
-.Nd copy part of a string to another
-.Sh SYNOPSIS
-.In string.h
-.Ft char *
-.Fn strncpy "char *dst" "const char *src" "size_t len"
-.Sh DESCRIPTION
-The
-.Fn strncpy
-function copies not more than
-.Fa len
-characters from the string
-.Fa src
-to the buffer
-.Fa dst .
-If
-.Fa src
-is less than
-.Fa len
-characters long,
-it fills the remaining buffer with
-.Ql \e0
-characters.
-If the length of
-.Fa src
-is greater than or equal to
-.Fa len ,
-.Fa dst
-will
-.Em not
-be NUL-terminated.
-.Pp
-.Fn strncpy
-.Em only
-NUL terminates the destination string when the length of the source
-string is less than the length parameter.
-.Pp
-If the
-.Fa src
-and
-.Fa dst
-strings overlap, the behavior is undefined.
-.Sh RETURN VALUES
-The
-.Fn strncpy
-function returns
-.Fa dst .
-.Sh EXAMPLES
-The following sets
-.Va chararray
-to
-.Dq abc\e0\e0\e0 :
-.Bd -literal -offset indent
-(void)strncpy(chararray, "abc", 6);
-.Ed
-.Pp
-The following sets
-.Va chararray
-to
-.Dq abcdef ,
-without a NUL-terminator:
-.Bd -literal -offset indent
-(void)strncpy(chararray, "abcdefgh", 6);
-.Ed
-.Pp
-The following sequence copies as many characters from
-.Va input
-to
-.Va buf
-as will fit, and then NUL terminates the result by hand:
-.Bd -literal -offset indent
-char buf[BUFSIZ];
-
-(void)strncpy(buf, input, sizeof(buf) - 1);
-buf[sizeof(buf) - 1] = '\e0';
-.Ed
-.Pp
-By now it is clear that
-.Nm strncpy
-is dangerously easy to misuse.
-The
-.Xr strlcpy 3
-function is safer for this kind of operation:
-.Bd -literal -offset indent
-if (strlcpy(buf, input, sizeof(buf)) >= sizeof(buf))
-        goto toolong;
-.Ed
-.Sh SEE ALSO
-.Xr strlcpy 3 ,
-.Xr wcscpy 3 ,
-.Xr wcslcpy 3
-.Sh STANDARDS
-The
-.Fn strncpy
-function conforms to
-.St -ansiC .
-.Sh HISTORY
-The
-.Fn strncpy
-function first appeared in
-.At v7 .