[apple/libc.git] / stdlib / FreeBSD / strtonum.c

/*-
 * 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.
 *
 *	$OpenBSD: strtonum.c,v 1.7 2013/04/17 18:40:58 tedu Exp $
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

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

#define	INVALID		1
#define	TOOSMALL	2
#define	TOOLARGE	3

long long
strtonum(const char *numstr, long long minval, long long maxval,
    const char **errstrp)
{
	long long ll = 0;
	int error = 0;
	char *ep;
	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 (errno == EINVAL || numstr == ep || *ep != '\0')
			error = INVALID;
		else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
			error = TOOSMALL;
		else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
			error = TOOLARGE;
	}
	if (errstrp != NULL)
		*errstrp = ev[error].errstr;
	errno = ev[error].err;
	if (error)
		ll = 0;

	return (ll);
}
Commit	Line	Data
a9aaacca A	1	/*-
	2	* Copyright (c) 2004 Ted Unangst and Todd Miller
	3	* All rights reserved.
	4	*
	5	* Permission to use, copy, modify, and distribute this software for any
	6	* purpose with or without fee is hereby granted, provided that the above
	7	* copyright notice and this permission notice appear in all copies.
	8	*
	9	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	10	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	11	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	12	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	13	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	14	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	15	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	16	*
	17	* $OpenBSD: strtonum.c,v 1.7 2013/04/17 18:40:58 tedu Exp $
	18	*/
	19
	20	#include <sys/cdefs.h>
	21	__FBSDID("$FreeBSD$");
	22
	23	#include <errno.h>
	24	#include <limits.h>
	25	#include <stdlib.h>
	26
	27	#define INVALID 1
	28	#define TOOSMALL 2
	29	#define TOOLARGE 3
	30
	31	long long
	32	strtonum(const char *numstr, long long minval, long long maxval,
	33	const char **errstrp)
	34	{
	35	long long ll = 0;
	36	int error = 0;
	37	char *ep;
	38	struct errval {
	39	const char *errstr;
	40	int err;
	41	} ev[4] = {
	42	{ NULL, 0 },
	43	{ "invalid", EINVAL },
	44	{ "too small", ERANGE },
	45	{ "too large", ERANGE },
	46	};
	47
	48	ev[0].err = errno;
	49	errno = 0;
	50	if (minval > maxval) {
	51	error = INVALID;
	52	} else {
	53	ll = strtoll(numstr, &ep, 10);
	54	if (errno == EINVAL \|\| numstr == ep \|\| *ep != '\0')
	55	error = INVALID;
	56	else if ((ll == LLONG_MIN && errno == ERANGE) \|\| ll < minval)
	57	error = TOOSMALL;
	58	else if ((ll == LLONG_MAX && errno == ERANGE) \|\| ll > maxval)
	59	error = TOOLARGE;
	60	}
	61	if (errstrp != NULL)
	62	*errstrp = ev[error].errstr;
	63	errno = ev[error].err;
	64	if (error)
65	ll = 0;
66
67	return (ll);
68	}