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-.\" Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org>
-.\" 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.
-.\" 4. 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.
-.\"
-.\"     @(#)strstr.3	8.1 (Berkeley) 6/4/93
-.\" $FreeBSD$
-.\"
-.Dd October 11, 2001
-.Dt STRSTR 3
-.Os
-.Sh NAME
-.Nm strstr , strcasestr , strnstr
-.Nd locate a substring in a string
-.Sh LIBRARY
-.Lb libc
-.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"
-.Ft char *
-.Fn strnstr "const char *big" "const char *little" "size_t len"
-.Sh DESCRIPTION
-The
-.Fn strstr
-function
-locates the first occurrence of the null-terminated string
-.Fa little
-in the null-terminated string
-.Fa big .
-.Pp
-The
-.Fn strcasestr
-function is similar to
-.Fn strstr ,
-but ignores the case of both strings.
-.Pp
-The
-.Fn strnstr
-function
-locates the first occurrence of the null-terminated string
-.Fa little
-in the string
-.Fa big ,
-where not more than
-.Fa len
-characters are searched.
-Characters that appear after a
-.Ql \e0
-character are not searched.
-Since the
-.Fn strnstr
-function is a
-.Fx
-specific API, it should only be used when portability is not a concern.
-.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 EXAMPLES
-The following sets the pointer
-.Va ptr
-to the
-.Qq Li Bar Baz
-portion of
-.Va largestring :
-.Bd -literal -offset indent
-const char *largestring = "Foo Bar Baz";
-const char *smallstring = "Bar";
-char *ptr;
-
-ptr = strstr(largestring, smallstring);
-.Ed
-.Pp
-The following sets the pointer
-.Va ptr
-to
-.Dv NULL ,
-because only the first 4 characters of
-.Va largestring
-are searched:
-.Bd -literal -offset indent
-const char *largestring = "Foo Bar Baz";
-const char *smallstring = "Bar";
-char *ptr;
-
-ptr = strnstr(largestring, smallstring, 4);
-.Ed
-.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 -isoC .