1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek and the American National Standards Committee X3, 6.\" on Information Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)strcspn.3 8.1 (Berkeley) 6/4/93 33.\" $NetBSD: strcspn.3,v 1.10 2006/10/16 08:48:45 wiz Exp $ 34.\" 35.Dd August 11, 2002 36.Dt STRCSPN 3 37.Os 38.Sh NAME 39.Nm strcspn 40.Nd span the complement of a string 41.Sh LIBRARY 42.Lb libc 43.Sh SYNOPSIS 44.In string.h 45.Ft size_t 46.Fn strcspn "const char *s" "const char *charset" 47.Sh DESCRIPTION 48The 49.Fn strcspn 50function 51spans the initial part of the nul-terminated string 52.Fa s 53as long as the characters from 54.Fa s 55do not occur in string 56.Fa charset 57(it 58spans the 59.Em complement 60of 61.Fa charset ) . 62.Sh RETURN VALUES 63The 64.Fn strcspn 65function 66returns the number of characters spanned. 67.Sh EXAMPLES 68The following call to 69.Fn strcspn 70will return 3, since the first three characters of string 71.Fa s 72do not occur in string 73.Fa charset : 74.Bd -literal -offset indent 75char *s = "foobar"; 76char *charset = "bar"; 77size_t span; 78 79span = strcspn(s, charset); 80.Ed 81.Sh SEE ALSO 82.Xr index 3 , 83.Xr memchr 3 , 84.Xr rindex 3 , 85.Xr strchr 3 , 86.Xr strpbrk 3 , 87.Xr strrchr 3 , 88.Xr strsep 3 , 89.Xr strspn 3 , 90.Xr strstr 3 , 91.Xr strtok 3 92.Sh STANDARDS 93The 94.Fn strcspn 95function 96conforms to 97.St -ansiC . 98