/* $OpenBSD: strtonum.c,v 1.8 2015/09/13 08:31:48 guenther 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.

*/

#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 (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);

}

DEF_WEAK(strtonum);