/*
 * Copyright (c) 2007, 2008 	Jeffrey Roberson <jeff@freebsd.org>
 * All rights reserved.
 *
 * Copyright (c) 2008 Nokia Corporation
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/cpuset.h>

#include <stdlib.h>
#include <string.h>
#include <libutil.h>
#include <ctype.h>

int
cpuset_parselist(const char *list, cpuset_t *mask)
{
	enum { NONE, NUM, DASH } state;
	int lastnum;
	int curnum;
	const char *l;

	if (strcasecmp(list, "all") == 0) {
		if (cpuset_getaffinity(CPU_LEVEL_ROOT, CPU_WHICH_PID, -1,
		    sizeof(*mask), mask) != 0)
			return (CPUSET_PARSE_GETAFFINITY);
		return (CPUSET_PARSE_OK);
	}
	state = NONE;
	curnum = lastnum = 0;
	for (l = list; *l != '\0';) {
		if (isdigit(*l)) {
			curnum = atoi(l);
			if (curnum > CPU_SETSIZE)
				return (CPUSET_PARSE_INVALID_CPU);
			while (isdigit(*l))
				l++;
			switch (state) {
			case NONE:
				lastnum = curnum;
				state = NUM;
				break;
			case DASH:
				for (; lastnum <= curnum; lastnum++)
					CPU_SET(lastnum, mask);
				state = NONE;
				break;
			case NUM:
			default:
				goto parserr;
			}
			continue;
		}
		switch (*l) {
		case ',':
			switch (state) {
			case NONE:
				break;
			case NUM:
				CPU_SET(curnum, mask);
				state = NONE;
				break;
			case DASH:
				goto parserr;
				break;
			}
			break;
		case '-':
			if (state != NUM)
				goto parserr;
			state = DASH;
			break;
		default:
			goto parserr;
		}
		l++;
	}
	switch (state) {
		case NONE:
			break;
		case NUM:
			CPU_SET(curnum, mask);
			break;
		case DASH:
			goto parserr;
	}
	return (CPUSET_PARSE_OK);
parserr:
	return (CPUSET_PARSE_ERROR);
}