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+.\" Copyright (c) 1990, 1991, 1993
+.\"	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.
+.\"
+.\"     @(#)memchr.3	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd April 9, 2008
+.Dt MEMCHR 3
+.Os
+.Sh NAME
+.Nm memchr
+.Nd locate byte in byte string
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In string.h
+.Ft void *
+.Fn memchr "const void *b" "int c" "size_t len"
+.Ft void *
+.Fn memrchr "const void *b" "int c" "size_t len"
+.Sh DESCRIPTION
+The
+.Fn memchr
+function
+locates the first occurrence of
+.Fa c
+(converted to an
+.Vt "unsigned char" )
+in string
+.Fa b .
+.Pp
+The
+.Fn memrchr
+function behaves like
+.Fn memchr ,
+except that it locates the last occurrence of
+.Fa c
+in string
+.Fa b .
+.Sh RETURN VALUES
+The
+.Fn memchr
+and
+.Fn memrchr
+functions
+return a pointer to the byte located,
+or NULL if no such byte exists within
+.Fa len
+bytes.
+.Sh SEE ALSO
+.Xr memmem 3 ,
+.Xr strchr 3 ,
+.Xr strcspn 3 ,
+.Xr strpbrk 3 ,
+.Xr strrchr 3 ,
+.Xr strsep 3 ,
+.Xr strspn 3 ,
+.Xr strstr 3 ,
+.Xr strtok 3 ,
+.Xr wmemchr 3
+.Sh STANDARDS
+The
+.Fn memchr
+function
+conforms to
+.St -isoC .
+.Pp
+The
+.Fn memrchr
+function is a GNU extension and conforms to no standard.
+.Sh HISTORY
+The
+.Fn memrchr
+function first appeared in GNU libc 2.1.91, this implementation
+first appeared in
+.Fx 6.4 ,
+coming from
+.Ox 4.3 .