config root man

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.\"     @(#)strcspn.3	8.1 (Berkeley) 6/4/93
.\" $FreeBSD: release/9.1.0/lib/libc/string/strcspn.3 165903 2007-01-09 00:28:16Z imp $
.\"
.Dd June 4, 1993
.Dt STRCSPN 3
.Os
.Sh NAME
.Nm strcspn
.Nd span the complement of a string
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In string.h
.Ft size_t
.Fn strcspn "const char *s" "const char *charset"
.Sh DESCRIPTION
The
.Fn strcspn
function
spans the initial part of the null-terminated string
.Fa s
as long as the characters from
.Fa s
do not occur in string
.Fa charset
(it
spans the
.Em complement
of
.Fa charset ) .
In other words, it computes the string array index in
.Fa s
of the first character of
.Fa s
which is also in
.Fa charset ,
else the index of the first null character.
.Sh RETURN VALUES
The
.Fn strcspn
function
returns the number of characters spanned.
.Sh SEE ALSO
.Xr memchr 3 ,
.Xr strchr 3 ,
.Xr strpbrk 3 ,
.Xr strrchr 3 ,
.Xr strsep 3 ,
.Xr strspn 3 ,
.Xr strstr 3 ,
.Xr strtok 3
.Sh STANDARDS
The
.Fn strcspn
function
conforms to
.St -isoC .