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.\" 38.Dd June 4, 1993 39.Dt STRSTR 3 40.Os 41.Sh NAME 42.Nm strstr 43.Nd locate a substring in a string 44.Sh SYNOPSIS 45.Fd #include <string.h> 46.Ft char * 47.Fn strstr "const char *big" "const char *little" 48.Sh DESCRIPTION 49The 50.Fn strstr 51function 52locates the first occurrence of the null-terminated string 53.Fa little 54in the null-terminated string 55.Fa big . 56If 57.Fa little 58is the empty string, 59.Fn strstr 60returns 61.Fa big ; 62if 63.Fa little 64occurs nowhere in 65.Fa big , 66.Fn strstr 67returns NULL; 68otherwise 69.Fn strstr 70returns a pointer to the first character of the first occurrence of 71.Fa little . 72.Sh SEE ALSO 73.Xr index 3 , 74.Xr memchr 3 , 75.Xr rindex 3 , 76.Xr strchr 3 , 77.Xr strcspn 3 , 78.Xr strpbrk 3 , 79.Xr strrchr 3 , 80.Xr strsep 3 , 81.Xr strspn 3 , 82.Xr strtok 3 83.Sh STANDARDS 84The 85.Fn strstr 86function 87conforms to 88.St -ansiC . 89