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	strtonum.c - ubase - suckless linux base utils
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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 WARRANT…
	12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE F…
	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 …
	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 < mi…
	56 error = TOOSMALL;
	57 else if ((ll == LLONG_MAX && errno == ERANGE) \|\| ll > ma…
	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 m…
	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 }