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.\" %sccs.include.redist.man% 9.\" 10.\" @(#)strstr.3 8.1 (Berkeley) 06/04/93 11.\" 12.Dd 13.Dt STRSTR 3 14.Os 15.Sh NAME 16.Nm strstr 17.Nd locate a substring in a string 18.Sh SYNOPSIS 19.Fd #include <string.h> 20.Ft char * 21.Fn strstr "const char *big" "const char *little" 22.Sh DESCRIPTION 23The 24.Fn strstr 25function 26locates the first occurrence of the null-terminated string 27.Fa little 28in the null-terminated string 29.Fa big . 30If 31.Fa little 32is the empty string, 33.Fn strstr 34returns 35.Fa big ; 36if 37.Fa little 38occurs nowhere in 39.Fa big , 40.Fn strstr 41returns NULL; 42otherwise 43.Fn strstr 44returns a pointer to the first character of the first occurrence of 45.Fa little . 46.Sh SEE ALSO 47.Xr index 3 , 48.Xr memchr 3 , 49.Xr rindex 3 , 50.Xr strchr 3 , 51.Xr strcspn 3 , 52.Xr strpbrk 3 , 53.Xr strrchr 3 , 54.Xr strsep 3 , 55.Xr strspn 3 , 56.Xr strtok 3 57.Sh STANDARDS 58The 59.Fn strstr 60function 61conforms to 62.St -ansiC . 63