1.\" Copyright (c) 1990, 1991 The Regents of the University of California. 2.\" 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. All advertising materials mentioning features or use of this software 17.\" must display the following acknowledgement: 18.\" This product includes software developed by the University of 19.\" California, Berkeley and its contributors. 20.\" 4. Neither the name of the University nor the names of its contributors 21.\" may be used to endorse or promote products derived from this software 22.\" without specific prior written permission. 23.\" 24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34.\" SUCH DAMAGE. 35.\" 36.\" $OpenBSD: strcspn.3,v 1.5 2000/04/21 15:24:20 aaron Exp $ 37.\" 38.Dd June 29, 1991 39.Dt STRCSPN 3 40.Os 41.Sh NAME 42.Nm strcspn 43.Nd span the complement of a string 44.Sh SYNOPSIS 45.Fd #include <string.h> 46.Ft size_t 47.Fn strcspn "const char *s" "const char *charset" 48.Sh DESCRIPTION 49The 50.Fn strcspn 51function spans the initial part of the null-terminated string 52.Fa s 53as long as the characters from 54.Fa s 55do not occur in string 56.Fa charset 57(it spans the 58.Em complement 59of 60.Fa charset ) . 61.Sh RETURN VALUES 62The 63.Fn strcspn 64function returns the number of characters spanned. 65.Sh EXAMPLES 66The following call to 67.Fn strcspn 68will return 3, since the first three characters of string 69.Fa s 70do not occur in string 71.Fa charset : 72.Bd -literal -offset indent 73char *s = "foobar"; 74char *charset = "bar"; 75size_t span; 76 77span = strcspn(s, charset); 78.Ed 79.Sh SEE ALSO 80.Xr memchr 3 , 81.Xr strchr 3 , 82.Xr strpbrk 3 , 83.Xr strrchr 3 , 84.Xr strsep 3 , 85.Xr strspn 3 , 86.Xr strstr 3 , 87.Xr strtok 3 88.Sh STANDARDS 89The 90.Fn strcspn 91function conforms to 92.St -ansiC . 93