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+.\"	$OpenBSD: strstr.3,v 1.13 2016/05/11 17:51:50 schwarze 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: May 11 2016 $
+.Dt STRSTR 3
+.Os
+.Sh NAME
+.Nm strstr , strcasestr
+.Nd locate a substring in a string
+.Sh SYNOPSIS
+.In string.h
+.Ft char *
+.Fn strstr "const char *big" "const char *little"
+.Ft char *
+.Fn strcasestr "const char *big" "const char *little"
+.Sh DESCRIPTION
+The
+.Fn strstr
+function locates the first occurrence of the NUL-terminated string
+.Fa little
+in the NUL-terminated string
+.Fa big .
+.Pp
+The
+.Fn strcasestr
+function is similar to
+.Fn strstr
+but ignores the case of both strings.
+.Sh RETURN VALUES
+If
+.Fa little
+is an empty string,
+.Fa big
+is returned;
+if
+.Fa little
+occurs nowhere in
+.Fa big ,
+.Dv NULL
+is returned;
+otherwise a pointer to the first character of the first occurrence of
+.Fa little
+is returned.
+.Sh SEE ALSO
+.Xr memchr 3 ,
+.Xr memmem 3 ,
+.Xr strchr 3 ,
+.Xr strcspn 3 ,
+.Xr strpbrk 3 ,
+.Xr strrchr 3 ,
+.Xr strsep 3 ,
+.Xr strspn 3 ,
+.Xr strtok 3 ,
+.Xr wcsstr 3
+.Sh STANDARDS
+The
+.Fn strstr
+function conforms to
+.St -ansiC .
+.Sh HISTORY
+The
+.Fn strstr
+function first appeared in
+.Bx 4.3 Reno .
+The
+.Fn strcasestr
+function appeared in glibc 2.1,
+was reimplemented for
+.Fx 4.5
+and ported to
+.Ox 3.8 .