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-.\"
-.\" Copyright (c) 2012 The NetBSD Foundation, Inc.
-.\" All rights reserved.
-.\"
-.\" This code is derived from software contributed to The NetBSD Foundation
-.\" by Alan Barrett
-.\"
-.\" 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.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
-.\"
-.\"	$NetBSD$
-.\"
-.Dd February 21, 2012
-.Dt MEMSET_S 3
-.Os
-.Sh NAME
-.Nm memset_s
-.Nd copy a value to all bytes of a memory buffer
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.Fd "#define __STDC_WANT_LIB_EXT1__ 1
-.In string.h
-.Ft errno_t
-.Fn memset_s "void *s" "rsize_t smax" "int c" "rsize_t n"
-.Sh DESCRIPTION
-The
-.Fn memset_s
-function copies the value
-.Fa c
-(converted to an unsigned char)
-into each of the first
-.Fa n
-bytes of the memory buffer whose starting address is given by
-.Fa s .
-.Pp
-It is a runtime-constraints violation if
-.Fa s
-is a null pointer,
-or if either of
-.Fa smax
-or
-.Fa n
-is larger than
-.Dv RSIZE_MAX ,
-or if
-.Fa smax
-is smaller than
-.Fa n .
-If there is a runtime-constraints violation, and if
-.Fa s
-is not a null pointer,
-and if
-.Fa smax
-is not larger than
-.Dv RSIZE_MAX ,
-then, before reporting the runtime-constraints violation,
-.Fn memset_s
-copies
-.Fa smax
-bytes to the destination.
-.Pp
-In contrast to the
-.Xr memset 3
-function,
-calls to
-.Fn memset_s
-will never be
-.Dq optimised away
-by a compiler.
-This property is required by the following sentences in
-section K.3.7.4.1 of
-.St -isoC-2011 :
-.Bd -filled -offset indent
-Unlike
-.Fn memset ,
-any call to the
-.Fn memset_s
-function shall be evaluated strictly according to the rules of
-the abstract machine as described in (5.1.2.3).
-That is, any call to the
-.Fn memset_s
-function shall assume that the memory indicated by
-.Fa s
-and
-.Fa n
-may be accessible in the future and thus must contain
-the values indicated by
-.Fa c .
-.Ed
-.Sh RETURN VALUES
-The
-.Fn memset_s
-function returns zero for success, or a non-zero error code
-if there was a runtime-constraints violation.
-.Sh ERRORS
-.Fn memset_s
-returns the following error codes.
-It does not store the error code in the global
-.Va errno
-variable:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The
-.Fa s
-argument was a null pointer.
-.It Bq Er E2BIG
-One or both of
-.Fa smax
-or
-.Fa n
-was larger than
-.Dv RSIZE_MAX .
-.It Bq Er EOVERFLOW
-.Fa n
-was larger than
-.Fa smax .
-.El
-.
-.Sh SEE ALSO
-.Xr memset 3 .
-.Sh STANDARDS
-The
-.Fn memset_s
-function conforms to
-.St -isoC-2011 ,
-except that the
-.Fn set_constraint_handler_s
-interface is not supported.