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/* $OpenBSD: strtonum.c,v 1.3 2004/06/21 23:12:25 marc Exp $ */
/*
* Copyright (c) 2004 Ted Unangst and Todd Miller
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#define INVALID 1
#define TOOSMALL 2
#define TOOLARGE 3
unsigned long long
strtonum(const char *numstr, long long minval, unsigned long long maxval,
const char **errstrp)
{
unsigned long long ull;
char *ep;
int error;
struct errval {
const char *errstr;
int err;
} ev[4] = {
{ NULL, 0 },
{ "invalid", EINVAL },
{ "too small", ERANGE },
{ "too large", ERANGE },
};
ev[0].err = errno;
errno = 0;
error = 0;
ull = 0;
if (minval > maxval || maxval < minval ||
(minval < 0 && maxval > LLONG_MAX))
error = INVALID;
else if (maxval > LLONG_MAX ) {
ull = strtoull(numstr, &ep, 10);
if (numstr == ep || *ep != '\0')
error = INVALID;
else if ((ull == ULLONG_MAX && errno == ERANGE) || ull > maxval)
error = TOOLARGE;
} else {
long long ll = strtoll(numstr, &ep, 10);
if (numstr == ep || *ep != '\0')
error = INVALID;
else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
error = TOOSMALL;
else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
error = TOOLARGE;
ull = (unsigned long long)ll;
}
if (errstrp != NULL)
*errstrp = ev[error].errstr;
errno = ev[error].err;
if (error)
ull = 0;
return (ull);
}
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