Libc-1081.1.3.tar.gz

[apple/libc.git] / string / FreeBSD / strspn.3

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.\" Chris Torek and the American National Standards Committee X3,
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.\"     @(#)strspn.3	8.1 (Berkeley) 6/4/93
.\" $FreeBSD: src/lib/libc/string/strspn.3,v 1.11 2009/04/07 13:42:53 trasz Exp $
.\"
.Dd June 4, 1993
.Dt STRSPN 3
.Os
.Sh NAME
.Nm strspn
.Nd span a string
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In string.h
.Ft size_t
.Fo strspn
.Fa "const char *s1"
.Fa "const char *s2"
.Fc
.Sh DESCRIPTION
The
.Fn strspn
function
spans the initial part of the null-terminated string
.Fa s1 ,
as long as the characters from
.Fa s1
occur in the null-terminated string
.Fa s2 .
In other words, it computes the string array index in
.Fa s1
of the first character of
.Fa s1
which is not in
.Fa s2 ,
else the index of the first null character.
.Sh RETURN VALUES
The
.Fn strspn
function
returns the number of characters spanned.
.Sh SEE ALSO
.Xr memchr 3 ,
.Xr strchr 3 ,
.Xr strcspn 3 ,
.Xr strpbrk 3 ,
.Xr strrchr 3 ,
.Xr strsep 3 ,
.Xr strstr 3 ,
.Xr strtok 3 ,
.Xr wcsspn 3
.Sh STANDARDS
The
.Fn strspn
function
conforms to
.St -isoC .