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.\" Chris Torek and the American National Standards Committee X3,
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.\"     from: @(#)strcspn.3	8.1 (Berkeley) 6/4/93
.\"	$NetBSD: strcspn.3,v 1.9 2003/08/07 16:43:50 agc Exp $
.\"
.Dd August 11, 2002
.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 ) .
.Sh RETURN VALUES
The
.Fn strcspn
function
returns the number of characters spanned.
.Sh EXAMPLES
The following call to
.Fn strcspn
will return 3, since the first three characters of string
.Fa s
do not occur in string
.Fa charset :
.Bd -literal -offset indent
char *s = "foobar";
char *charset = "bar";
size_t span;

span = strcspn(s, charset);
.Ed
.Sh SEE ALSO
.Xr index 3 ,
.Xr memchr 3 ,
.Xr rindex 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 -ansiC .