usr/src/lib/libc/string/strspn.c

/*
 * Copyright (c) 1985 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strspn.c    5.5 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <string.h>

strspn(s, set)
        register char *s, *set;
{
        register n = 0;
        register char *p;
        register c;

        while (c = *s++) {
                for (p = set; *p; p++)
                        if (c == *p)
                                break;
                if (!*p)
                        return (n);
                n++;
        }
        return (n);
}