NetBSD/lib/libc/string/strspn.3

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.\"     from: @(#)strspn.3	8.1 (Berkeley) 6/4/93
.\"	$NetBSD: strspn.3,v 1.11 2006/10/16 08:48:45 wiz Exp $
.\"
.Dd August 11, 2002
.Dt STRSPN 3
.Os
.Sh NAME
.Nm strspn
.Nd span a string
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In string.h
.Ft size_t
.Fn strspn "const char *s" "const char *charset"
.Sh DESCRIPTION
The
.Fn strspn
function
spans the initial part of the nul-terminated string
.Fa s
as long as the characters from
.Fa s
occur in string
.Fa charset .
.Sh RETURN VALUES
The
.Fn strspn
function
returns the number of characters spanned.
.Sh EXAMPLES
The following call to
.Fn strspn
will return 3, since the first three characters of string
.Fa s
are part of string
.Fa charset :
.Bd -literal -offset indent
char *s = "foobar";
char *charset = "of";
size_t span;

span = strspn(s, charset);
.Ed
.Sh SEE ALSO
.Xr index 3 ,
.Xr memchr 3 ,
.Xr rindex 3 ,
.Xr strchr 3 ,
.Xr strcspn 3 ,
.Xr strpbrk 3 ,
.Xr strrchr 3 ,
.Xr strsep 3 ,
.Xr strstr 3 ,
.Xr strtok 3
.Sh STANDARDS
The
.Fn strspn
function
conforms to
.St -ansiC .