.\" 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.
.\" %sccs.include.redist.man%
.\"
.\"     @(#)index.3	8.1 (Berkeley) 06/04/93
.\"
.Dd 
.Dt INDEX 3
.Os
.Sh NAME
.Nm index
.Nd locate character in string
.Sh SYNOPSIS
.Fd #include <string.h>
.Ft char *
.Fn index "const char *s" "int c"
.Sh DESCRIPTION
The
.Fn index
function
locates the first character matching
.Fa c
(converted to a
.Em char )
in the null-terminated string
.Fa s .
.Sh RETURN VALUES
A pointer to the character is returned if it is found; otherwise
.Dv NULL
is returned.
If
.Fa c
is '\e0',
.Fn index
locates the terminating '\e0'.
.Sh SEE ALSO
.Xr memchr 3 ,
.Xr rindex 3 ,
.Xr strchr 3 ,
.Xr strcspn 3 ,
.Xr strpbrk 3 ,
.Xr strrchr 3 ,
.Xr strsep 3 ,
.Xr strspn 3 ,
.Xr strstr 3 ,
.Xr strtok 3
.Sh HISTORY
A
.Fn index
function appeared in 
.At v6 .