[openssh.git] / openbsd-compat / strtonum.c

/*	$OpenBSD: strtonum.c,v 1.6 2004/08/03 19:38:01 millert Exp $	*/

/*
 * 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 ORIGINAL: lib/libc/stdlib/strtonum.c */

#include "includes.h"

#ifndef HAVE_STRTONUM
#include <stdlib.h>
#include <limits.h>
#include <errno.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;
	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 ((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);
}

#endif /* HAVE_STRTONUM */
Commit	Line	Data
8a3ff1aa	1	/* $OpenBSD: strtonum.c,v 1.6 2004/08/03 19:38:01 millert Exp $ */
	2
	3	/*
	4	* Copyright (c) 2004 Ted Unangst and Todd Miller
	5	* All rights reserved.
	6	*
	7	* Permission to use, copy, modify, and distribute this software for any
	8	* purpose with or without fee is hereby granted, provided that the above
	9	* copyright notice and this permission notice appear in all copies.
	10	*
	11	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	12	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	13	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	14	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	15	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	16	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	17	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	18	*/
	19
f6d4fb87	20	/* OPENBSD ORIGINAL: lib/libc/stdlib/strtonum.c */
f6d4fb87	21
8a3ff1aa	22	#include "includes.h"
5946a69f	23
8a3ff1aa	24	#ifndef HAVE_STRTONUM
5946a69f	25	#include <stdlib.h>
8a3ff1aa	26	#include <limits.h>
fec71b2f	27	#include <errno.h>
8a3ff1aa	28
	29	#define INVALID 1
	30	#define TOOSMALL 2
	31	#define TOOLARGE 3
	32
	33	long long
	34	strtonum(const char *numstr, long long minval, long long maxval,
	35	const char **errstrp)
	36	{
	37	long long ll = 0;
	38	char *ep;
	39	int error = 0;
	40	struct errval {
	41	const char *errstr;
	42	int err;
	43	} ev[4] = {
	44	{ NULL, 0 },
	45	{ "invalid", EINVAL },
	46	{ "too small", ERANGE },
	47	{ "too large", ERANGE },
	48	};
	49
	50	ev[0].err = errno;
	51	errno = 0;
	52	if (minval > maxval)
	53	error = INVALID;
	54	else {
	55	ll = strtoll(numstr, &ep, 10);
	56	if (numstr == ep \|\| *ep != '\0')
	57	error = INVALID;
	58	else if ((ll == LLONG_MIN && errno == ERANGE) \|\| ll < minval)
	59	error = TOOSMALL;
	60	else if ((ll == LLONG_MAX && errno == ERANGE) \|\| ll > maxval)
	61	error = TOOLARGE;
	62	}
	63	if (errstrp != NULL)
	64	*errstrp = ev[error].errstr;
	65	errno = ev[error].err;
	66	if (error)
	67	ll = 0;
	68
	69	return (ll);
	70	}
	71
	72	#endif /* HAVE_STRTONUM */