sad

simple audio daemon
git clone git@git.2f30.org/sad.git
Log | Files | Refs | LICENSE

strtonum.c (1812B)


      1 /*-
      2  * Copyright (c) 2004 Ted Unangst and Todd Miller
      3  * All rights reserved.
      4  *
      5  * Permission to use, copy, modify, and distribute this software for any
      6  * purpose with or without fee is hereby granted, provided that the above
      7  * copyright notice and this permission notice appear in all copies.
      8  *
      9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     16  *
     17  *	$OpenBSD: strtonum.c,v 1.6 2004/08/03 19:38:01 millert Exp $
     18  */
     19 
     20 #include <errno.h>
     21 #include <limits.h>
     22 #include <stdlib.h>
     23 
     24 #include "../compat.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 	char *ep;
     36 	int error = 0;
     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 (errno == EINVAL || 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 }