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      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 #if HAVE_NBTOOL_CONFIG_H
     20 #include "nbtool_config.h"
     21 #endif
     22 #include <sys/cdefs.h>
     23 __RCSID("$NetBSD: strtonum.c,v 1.2 2009/10/26 21:14:18 christos Exp $");
     24 #include <errno.h>
     25 #include <limits.h>
     26 #include <stdlib.h>
     27 
     28 #define INVALID 	1
     29 #define TOOSMALL 	2
     30 #define TOOLARGE 	3
     31 
     32 long long
     33 strtonum(const char *numstr, long long minval, long long maxval,
     34     const char **errstrp);
     35 long long
     36 strtonum(const char *numstr, long long minval, long long maxval,
     37     const char **errstrp)
     38 {
     39 	long long ll = 0;
     40 	char *ep;
     41 	int error = 0;
     42 	struct errval {
     43 		const char *errstr;
     44 		int err;
     45 	} ev[4] = {
     46 		{ NULL,		0 },
     47 		{ "invalid",	EINVAL },
     48 		{ "too small",	ERANGE },
     49 		{ "too large",	ERANGE },
     50 	};
     51 
     52 	ev[0].err = errno;
     53 	errno = 0;
     54 	if (minval > maxval)
     55 		error = INVALID;
     56 	else {
     57 		ll = strtoll(numstr, &ep, 10);
     58 		if (numstr == ep || *ep != '\0')
     59 			error = INVALID;
     60 		else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
     61 			error = TOOSMALL;
     62 		else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
     63 			error = TOOLARGE;
     64 	}
     65 	if (errstrp != NULL)
     66 		*errstrp = ev[error].errstr;
     67 	errno = ev[error].err;
     68 	if (error)
     69 		ll = 0;
     70 
     71 	return (ll);
     72 }
     73 
     74