1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek and the American National Standards Committee X3, 6.\" on Information Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. All advertising materials mentioning features or use of this software 17.\" must display the following acknowledgement: 18.\" This product includes software developed by the University of 19.\" California, Berkeley and its contributors. 20.\" 4. Neither the name of the University nor the names of its contributors 21.\" may be used to endorse or promote products derived from this software 22.\" without specific prior written permission. 23.\" 24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34.\" SUCH DAMAGE. 35.\" 36.\" @(#)strstr.3 8.1 (Berkeley) 6/4/93 37.\" $FreeBSD$ 38.\" 39.Dd June 4, 1993 40.Dt STRSTR 3 41.Os 42.Sh NAME 43.Nm strstr 44.Nd locate a substring in a string 45.Sh SYNOPSIS 46.Fd #include <string.h> 47.Ft char * 48.Fn strstr "const char *big" "const char *little" 49.Sh DESCRIPTION 50The 51.Fn strstr 52function 53locates the first occurrence of the null-terminated string 54.Fa little 55in the null-terminated string 56.Fa big . 57If 58.Fa little 59is the empty string, 60.Fn strstr 61returns 62.Fa big ; 63if 64.Fa little 65occurs nowhere in 66.Fa big , 67.Fn strstr 68returns NULL; 69otherwise 70.Fn strstr 71returns a pointer to the first character of the first occurrence of 72.Fa little . 73.Sh SEE ALSO 74.Xr index 3 , 75.Xr memchr 3 , 76.Xr rindex 3 , 77.Xr strchr 3 , 78.Xr strcspn 3 , 79.Xr strpbrk 3 , 80.Xr strrchr 3 , 81.Xr strsep 3 , 82.Xr strspn 3 , 83.Xr strtok 3 84.Sh STANDARDS 85The 86.Fn strstr 87function 88conforms to 89.St -ansiC . 90