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libite

    1: /*	$OpenBSD: strtonum.c,v 1.7 2013/04/17 18:40:58 tedu 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: 
   20: #include <errno.h>
   21: #include <limits.h>
   22: #include <stdlib.h>
   23: 
   24: #ifndef strtonum
   25: #define	INVALID		1
   26: #define	TOOSMALL	2
   27: #define	TOOLARGE	3
   28: 
   29: long long
   30: strtonum(const char *numstr, long long minval, long long maxval,
   31:     const char **errstrp)
   32: {
   33: 	long long ll = 0;
   34: 	int error = 0;
   35: 	char *ep;
   36: 	struct errval {
   37: 		const char *errstr;
   38: 		int err;
   39: 	} ev[4] = {
   40: 		{ NULL,		0 },
   41: 		{ "invalid",	EINVAL },
   42: 		{ "too small",	ERANGE },
   43: 		{ "too large",	ERANGE },
   44: 	};
   45: 
   46: 	ev[0].err = errno;
   47: 	errno = 0;
   48: 	if (minval > maxval) {
   49: 		error = INVALID;
   50: 	} else {
   51: 		ll = strtoll(numstr, &ep, 10);
   52: 		if (numstr == ep || *ep != '\0')
   53: 			error = INVALID;
   54: 		else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
   55: 			error = TOOSMALL;
   56: 		else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
   57: 			error = TOOLARGE;
   58: 	}
   59: 	if (errstrp != NULL)
   60: 		*errstrp = ev[error].errstr;
   61: 	errno = ev[error].err;
   62: 	if (error)
   63: 		ll = 0;
   64: 
   65: 	return (ll);
   66: }
   67: #endif