/*
 * Copyright (c) 1990 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND CARNEGIE MELLON UNIVERSITY
 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT
 * SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
 * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Users of this software agree to return to Carnegie Mellon any
 * improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 *
 * Export of this software is permitted only after complying with the
 * regulations of the U.S. Deptartment of Commerce relating to the
 * Export of Technical Data.
 */
/************************************************************************
 *  skipover and skipto -- skip over characters in string
 *
 *  Usage:	p = skipto (string,charset);
 *		p = skipover (string,charset);
 *
 *  char *p,*charset,*string;
 *
 *  Skipto returns a pointer to the first character in string which
 *  is in the string charset; it "skips until" a character in charset.
 *  Skipover returns a pointer to the first character in string which
 *  is not in the string charset; it "skips over" characters in charset.
 ************************************************************************
 * HISTORY
 * $Log:	skipto.c,v $
 * Revision 1.1  95/07/17  21:07:12  lily
 * Initial revision
 * 
 * Revision 1.2  90/12/11  17:59:10  mja
 * 	Add copyright/disclaimer for distribution.
 * 
 * 26-Jun-81  David Smith (drs) at Carnegie-Mellon University
 *	Skipover, skipto rewritten to avoid inner loop at expense of space.
 *
 * 20-Nov-79  Steven Shafer (sas) at Carnegie-Mellon University
 *	Skipover, skipto adapted for VAX from skip() and skipx() on the PDP-11
 *	(from Ken Greer).  The names are more mnemonic.
 *
 *	Sindex adapted for VAX from indexs() on the PDP-11 (thanx to Ralph
 *	Guggenheim).  The name has changed to be more like the index()
 *	and rindex() functions from Bell Labs; the return value (pointer
 *	rather than integer) has changed partly for the same reason,
 *	and partly due to popular usage of this function.
 */

static unsigned char tab[256] = {
	0};

char *skipto (string,charset)
unsigned char *string, *charset;
{
	register unsigned char *setp,*strp;

	tab[0] = 1;		/* Stop on a null, too. */
	for (setp=charset;  *setp;  setp++) tab[*setp]=1;
	for (strp=string;  tab[*strp]==0;  strp++)  ;
	for (setp=charset;  *setp;  setp++) tab[*setp]=0;
	return ((char *)strp);
}

char *skipover (string,charset)
unsigned char *string, *charset;
{
	register unsigned char *setp,*strp;

	tab[0] = 0;		/* Do not skip over nulls. */
	for (setp=charset;  *setp;  setp++) tab[*setp]=1;
	for (strp=string;  tab[*strp];  strp++)  ;
	for (setp=charset;  *setp;  setp++) tab[*setp]=0;
	return ((char *)strp);
}
