don't truncate lines, don't allow tabs to back up (I think this is tested!)

[unix-history] / usr / src / lib / libc / string / strspn.c

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strspn.c	5.7 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/stdc.h>
#include <string.h>

/*
 * Span the string s2 (skip characters that are in s2).
 */
size_t
strspn(s1, s2)
	const char *s1;
	register const char *s2;
{
	register const char *p = s1, *spanp;
	register char c, sc;

	/*
	 * Skip any characters in s2, excluding the terminating \0.
	 */
cont:
	c = *p++;
	for (spanp = s2; (sc = *spanp++) != 0;)
		if (sc == c)
			goto cont;
	return (p - 1 - s1);
}