/*-
 * Copyright (C) Baptiste Daroussin <bapt@FreeBSD.org>
 *
 * 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 DAVID L. NUGENT 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 DAVID L. NUGENT 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/cdefs.h>
__FBSDID("$FreeBSD$");

#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <stdlib.h>

#include "pw.h"

#define INVALID		"invalid"
#define TOOSMALL	"too small"
#define	TOOLARGE	"too large"

uintmax_t
strtounum(const char *numstr, uintmax_t minval, uintmax_t maxval,
    const char **errstrp)
{
	uintmax_t ret = 0;
	char *ep;

	if (minval > maxval) {
		errno = EINVAL;
		if (errstrp != NULL)
			*errstrp = INVALID;
		return (0);
	}

	ret = strtoumax(numstr, &ep, 10);
	if (errno == EINVAL || numstr == ep || *ep != '\0') {
		errno = EINVAL;
		if (errstrp != NULL)
			*errstrp = INVALID;
		return (0);
	} else if ((ret == 0 && errno == ERANGE) || ret < minval) {
		errno = ERANGE;
		if (errstrp != NULL)
			*errstrp = TOOSMALL;
		return (0);
	} else if ((ret == UINTMAX_MAX && errno == ERANGE) || ret > maxval) {
		errno = ERANGE;
		if (errstrp != NULL)
			*errstrp = TOOLARGE;
		return (0);
	}

	return (ret);
}