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-.\"     $OpenBSD: strncat.3,v 1.4 2014/04/19 16:50:46 jmc 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 STRNCAT 3
-.Os
-.Sh NAME
-.Nm strncat
-.Nd concatenate a string with part of another
-.Sh SYNOPSIS
-.In string.h
-.Ft char *
-.Fn strncat "char *dst" "const char *append" "size_t count"
-.Sh DESCRIPTION
-The
-.Fn strncat
-function appends not more than
-.Fa count
-characters of the string
-.Fa append
-to the end of the string found in the buffer
-.Fa dst .
-Space for the terminating
-.Ql \e0
-should not be included in
-.Fa count .
-.Pp
-Bounds checking must be performed manually with great care.
-If the buffer
-.Fa dst
-is not large enough to hold the result,
-subsequent memory will be damaged.
-.Sh RETURN VALUES
-The
-.Fn strncat
-function returns the pointer
-.Fa dst .
-.Sh EXAMPLES
-The following example shows how to use
-.Fn strncat
-in conjunction with
-.Xr strncpy 3 :
-.Bd -literal -offset indent
-char buf[BUFSIZ];
-char *base, *suffix;
-
-(void)strncpy(buf, base, sizeof(buf) - 1);
-buf[sizeof(buf) - 1] = '\e0';
-(void)strncat(buf, suffix, sizeof(buf) - 1 - strlen(buf));
-.Ed
-.Pp
-The above will copy as many characters from
-.Va base
-to
-.Va buf
-as will fit.
-It then appends as many characters from
-.Va suffix
-as will fit.
-If either
-.Va base
-or
-.Va suffix
-are too large, truncation will occur without detection.
-.Pp
-The above example shows dangerous coding patterns, including an
-inability to detect truncation.
-.Fn strncat
-and
-.Fn strncpy
-are dangerously easy to misuse.
-The
-.Xr strlcpy 3
-and
-.Xr strlcat 3
-functions are safer for this kind of operation:
-.Bd -literal -offset indent
-if (strlcpy(buf, base, sizeof(buf)) >= sizeof(buf) ||
-    strlcat(buf, suffix, sizeof(buf)) >= sizeof(buf))
-        goto toolong;
-
-.Ed
-or for greatest portability,
-.Bd -literal -offset indent
-if (snprintf(buf, sizeof(buf), "%s%s",
-    base, suffix) >= sizeof(buf))
-        goto toolong;
-.Ed
-.Sh SEE ALSO
-.Xr strlcpy 3 ,
-.Xr wcscat 3 ,
-.Xr wcslcpy 3
-.Sh STANDARDS
-The
-.Fn strncat
-function conforms to
-.St -ansiC .
-.Sh HISTORY
-The
-.Fn strncat
-function first appeared in
-.At v7 .