sbase

suckless unix tools
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strtonum.c (2185B)

      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 #include "../util.h"
     25 
     26 #define	INVALID		1
     27 #define	TOOSMALL	2
     28 #define	TOOLARGE	3
     29 
     30 long long
     31 strtonum(const char *numstr, long long minval, long long maxval,
     32          const char **errstrp)
     33 {
     34 	long long ll = 0;
     35 	int error = 0;
     36 	char *ep;
     37 	struct errval {
     38 		const char *errstr;
     39 		int err;
     40 	} ev[4] = {
     41 		{ NULL,		0 },
     42 		{ "invalid",	EINVAL },
     43 		{ "too small",	ERANGE },
     44 		{ "too large",	ERANGE },
     45 	};
     46 
     47 	ev[0].err = errno;
     48 	errno = 0;
     49 	if (minval > maxval) {
     50 		error = INVALID;
     51 	} else {
     52 		ll = strtoll(numstr, &ep, 10);
     53 		if (numstr == ep || *ep != '\0')
     54 			error = INVALID;
     55 		else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
     56 			error = TOOSMALL;
     57 		else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
     58 			error = TOOLARGE;
     59 	}
     60 	if (errstrp != NULL)
     61 		*errstrp = ev[error].errstr;
     62 	errno = ev[error].err;
     63 	if (error)
     64 		ll = 0;
     65 
     66 	return (ll);
     67 }
     68 
     69 long long
     70 enstrtonum(int status, const char *numstr, long long minval, long long maxval)
     71 {
     72 	const char *errstr;
     73 	long long ll;
     74 
     75 	ll = strtonum(numstr, minval, maxval, &errstr);
     76 	if (errstr)
     77 		enprintf(status, "strtonum %s: %s\n", numstr, errstr);
     78 	return ll;
     79 }
     80 
     81 long long
     82 estrtonum(const char *numstr, long long minval, long long maxval)
     83 {
     84 	return enstrtonum(1, numstr, minval, maxval);
     85 }