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-.\"     $OpenBSD: strlcpy.3,v 1.22 2012/04/03 14:01:55 jmc Exp $
-.\"
-.\" Copyright (c) 1998, 2000 Todd C. Miller <Todd.Miller@courtesan.com>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate: April 3 2012 $
-.Dt STRLCPY 3
-.Os
-.Sh NAME
-.Nm strlcpy ,
-.Nm strlcat
-.Nd size-bounded string copying and concatenation
-.Sh SYNOPSIS
-.Fd #include <string.h>
-.Ft size_t
-.Fn strlcpy "char *dst" "const char *src" "size_t dstsize"
-.Ft size_t
-.Fn strlcat "char *dst" "const char *src" "size_t dstsize"
-.Sh DESCRIPTION
-The
-.Fn strlcpy
-and
-.Fn strlcat
-functions copy and concatenate strings with the
-same input parameters and output result as
-.Xr snprintf 3 .
-They are designed to be safer, more consistent, and less error
-prone replacements for the easily misused functions
-.Xr strncpy 3
-and
-.Xr strncat 3 .
-.Pp
-.Fn strlcpy
-and
-.Fn strlcat
-take the full size of the destination buffer and guarantee
-NUL-termination if there is room.
-Note that room for the NUL should be included in
-.Fa dstsize .
-.Pp
-.Fn strlcpy
-copies up to
-.Fa dstsize
-\- 1 characters from the string
-.Fa src
-to
-.Fa dst ,
-NUL-terminating the result if
-.Fa dstsize
-is not 0.
-.Pp
-.Fn strlcat
-appends string
-.Fa src
-to the end of
-.Fa dst .
-It will append at most
-.Fa dstsize
-\- strlen(dst) \- 1 characters.
-It will then NUL-terminate, unless
-.Fa dstsize
-is 0 or the original
-.Fa dst
-string was longer than
-.Fa dstsize
-(in practice this should not happen
-as it means that either
-.Fa dstsize
-is incorrect or that
-.Fa dst
-is not a proper string).
-.Sh RETURN VALUES
-Besides quibbles over the return type
-.Pf ( Va size_t
-versus
-.Va int )
-and signal handler safety
-.Pf ( Xr snprintf 3
-is not entirely safe on some systems), the
-following two are equivalent:
-.Bd -literal -offset indent
-n = strlcpy(dst, src, len);
-n = snprintf(dst, len, "%s", src);
-.Ed
-.Pp
-Like
-.Xr snprintf 3 ,
-the
-.Fn strlcpy
-and
-.Fn strlcat
-functions return the total length of the string they tried to create.
-For
-.Fn strlcpy
-that means the length of
-.Fa src .
-For
-.Fn strlcat
-that means the initial length of
-.Fa dst
-plus
-the length of
-.Fa src .
-.Pp
-If the return value is
-.Cm >=
-.Va dstsize ,
-the output string has been truncated.
-It is the caller's responsibility to handle this.
-.Sh EXAMPLES
-The following code fragment illustrates the simple case:
-.Bd -literal -offset indent
-char *s, *p, buf[BUFSIZ];
-
-\&...
-
-(void)strlcpy(buf, s, sizeof(buf));
-(void)strlcat(buf, p, sizeof(buf));
-.Ed
-.Pp
-To detect truncation, perhaps while building a pathname, something
-like the following might be used:
-.Bd -literal -offset indent
-char *dir, *file, pname[MAXPATHLEN];
-
-\&...
-
-if (strlcpy(pname, dir, sizeof(pname)) >= sizeof(pname))
-        goto toolong;
-if (strlcat(pname, file, sizeof(pname)) >= sizeof(pname))
-        goto toolong;
-.Ed
-.Pp
-Since it is known how many characters were copied the first time, things
-can be sped up a bit by using a copy instead of an append:
-.Bd -literal -offset indent
-char *dir, *file, pname[MAXPATHLEN];
-size_t n;
-
-\&...
-
-n = strlcpy(pname, dir, sizeof(pname));
-if (n >= sizeof(pname))
-        goto toolong;
-if (strlcpy(pname + n, file, sizeof(pname) - n) >= sizeof(pname) - n)
-        goto toolong;
-.Ed
-.Pp
-However, one may question the validity of such optimizations, as they
-defeat the whole purpose of
-.Fn strlcpy
-and
-.Fn strlcat .
-As a matter of fact, the first version of this manual page got it wrong.
-.Sh SEE ALSO
-.Xr snprintf 3 ,
-.Xr strncat 3 ,
-.Xr strncpy 3 ,
-.Xr wcslcpy 3
-.Sh HISTORY
-.Fn strlcpy
-and
-.Fn strlcat
-first appeared in
-.Ox 2.4 .
-.Sh AUTHORS
-.Fn strlcpy
-and
-.Fn strlcat
-were created by
-.An Todd C. Miller Aq Todd.Miller@courtesan.com .