written by Robert Elz; add Berkeley specific header

[unix-history] / 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 this notice is preserved and that due credit is given
 * to the University of California at Berkeley. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific written prior permission. This software
 * is provided ``as is'' without express or implied warranty.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strspn.c	5.3 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

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);
}