/*
 * Copyright (c) 2004 Ted Unangst and Todd Miller
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
 */

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

enum {
	INVALID = 1,
	TOOSMALL = 2,
	TOOLARGE = 3
};

long long
cext_strtonum(const char *numstr, long long minval, long long maxval,
		const char **errstrp)
{
	long long ll = 0;
	char *ep;
	int error = 0;
	struct errval {
		const char *errstr;
		int err;
	} ev[4] = {
		{NULL, 0},
		{"invalid", EINVAL},
		{"too small", ERANGE},
		{"too large", ERANGE},
	};

	ev[0].err = errno;
	errno = 0;
	if(minval > maxval)
		error = INVALID;
	else {
		ll = strtoll(numstr, &ep, 10);
		if(numstr == ep || *ep != 0)
			error = INVALID;
		else if(errno == ERANGE || ll < minval)
			error = TOOSMALL;
		else if(errno == ERANGE || ll > maxval)
			error = TOOLARGE;
	}
	if(errstrp != NULL)
		*errstrp = ev[error].errstr;
	errno = ev[error].err;
	if(error)
		ll = 0;

	return (ll);
}