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/*
* Copyright (c) 2013-2014 Todd C. Miller <Todd.Miller@sudo.ws>
*
* 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.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <sys/types.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#define DEFAULT_TEXT_DOMAIN "sudo"
#include "sudo_gettext.h" /* must be included before sudo_compat.h */
#include "sudo_compat.h"
#ifdef HAVE_STRTONUM
/*
* The OpenBSD strtonum error string too short to be translated sensibly.
* This wrapper just changes errstr as follows:
* invalid -> invalid value
* too large -> value too large
* too small -> value too small
*/
long long
sudo_strtonum(const char *str, long long minval, long long maxval,
const char **errstrp)
{
long long retval;
const char *errstr;
# undef strtonum
retval = strtonum(str, minval, maxval, &errstr);
if (errstr != NULL) {
if (errno == EINVAL) {
errstr = N_("invalid value");
} else if (errno == ERANGE) {
errstr = strcmp(errstr, "too large") == 0 ?
N_("value too large") : N_("value too small");
}
}
if (errstrp != NULL)
*errstrp = errstr;
return retval;
}
#else
enum strtonum_err {
STN_VALID,
STN_INVALID,
STN_TOOSMALL,
STN_TOOBIG
};
/*
* Convert a string to a number in the range [minval, maxval]
*/
long long
sudo_strtonum(const char *str, long long minval, long long maxval,
const char **errstrp)
{
const unsigned char *ustr = (const unsigned char *)str;
enum strtonum_err errval = STN_VALID;
long long lastval, result = 0;
unsigned char dig, sign;
int remainder;
if (minval > maxval) {
errval = STN_INVALID;
goto done;
}
/* Trim leading space and check sign, if any. */
while (isspace(*ustr)) {
ustr++;
}
switch (*ustr) {
case '-':
sign = '-';
ustr++;
break;
case '+':
ustr++;
/* FALLTHROUGH */
default:
sign = '+';
break;
}
/*
* To prevent overflow we determine the highest (or lowest in
* the case of negative numbers) value result can have *before*
* if its multiplied (divided) by 10 as well as the remainder.
* If result matches this value and the next digit is larger than
* the remainder, we know the result is out of range.
* The remainder is always positive since it is compared against
* an unsigned digit.
*/
if (sign == '-') {
lastval = minval / 10;
remainder = -(minval % 10);
if (remainder < 0) {
lastval += 1;
remainder += 10;
}
while ((dig = *ustr++) != '\0') {
if (!isdigit(dig)) {
errval = STN_INVALID;
break;
}
dig -= '0';
if (result < lastval || (result == lastval && dig > remainder)) {
errval = STN_TOOSMALL;
break;
} else {
result *= 10;
result -= dig;
}
}
if (result > maxval)
errval = STN_TOOBIG;
} else {
lastval = maxval / 10;
remainder = maxval % 10;
while ((dig = *ustr++) != '\0') {
if (!isdigit(dig)) {
errval = STN_INVALID;
break;
}
dig -= '0';
if (result > lastval || (result == lastval && dig > remainder)) {
errval = STN_TOOBIG;
break;
} else {
result *= 10;
result += dig;
}
}
if (result < minval)
errval = STN_TOOSMALL;
}
done:
switch (errval) {
case STN_VALID:
if (errstrp != NULL)
*errstrp = NULL;
break;
case STN_INVALID:
result = 0;
errno = EINVAL;
if (errstrp != NULL)
*errstrp = N_("invalid value");
break;
case STN_TOOSMALL:
result = 0;
errno = ERANGE;
if (errstrp != NULL)
*errstrp = N_("value too small");
break;
case STN_TOOBIG:
result = 0;
errno = ERANGE;
if (errstrp != NULL)
*errstrp = N_("value too large");
break;
}
return result;
}
#endif /* HAVE_STRTONUM */
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