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Fix overflow and underflow checks for string conversion to int

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Current error checks for to_int and to_int64 do not issue overflow error
messages for INT64_MAX + 1, INT64_MAX + 2, and other numbers close to the
integer limits. Likewise, error checks for hex_to_int, hex_to_int64 and
bin_to_int64 issue false positive error messages for INT64_MIN or INT32_MIN.
This commit fixes these error checks.
This commit is contained in:
Maganty Rushyendra 2020-07-01 15:13:12 +08:00
parent 0a8dbe7f75
commit 687b127fc5
1 changed files with 10 additions and 6 deletions
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16
core/ustring.cpp
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@ -1650,8 +1650,9 @@ int64_t String::hex_to_int(bool p_with_prefix) const {
} else {
return 0;
}
ERR_FAIL_COND_V_MSG(hex > INT64_MAX / 16, sign == 1 ? INT64_MAX : INT64_MIN, "Cannot represent " + *this + " as 64-bit integer, provided value is " + (sign == 1 ? "too big." : "too small."));
// Check for overflow/underflow, with special case to ensure INT64_MIN does not result in error
bool overflow = ((hex > INT64_MAX / 16) && (sign == 1 || (sign == -1 && hex != (INT64_MAX >> 4) + 1))) || (sign == -1 && hex == (INT64_MAX >> 4) + 1 && c > '0');
ERR_FAIL_COND_V_MSG(overflow, sign == 1 ? INT64_MAX : INT64_MIN, "Cannot represent " + *this + " as 64-bit integer, provided value is " + (sign == 1 ? "too big." : "too small."));
hex *= 16;
hex += n;
s++;
@ -1690,8 +1691,9 @@ int64_t String::bin_to_int(bool p_with_prefix) const {
} else {
return 0;
}
ERR_FAIL_COND_V_MSG(binary > INT64_MAX / 2, sign == 1 ? INT64_MAX : INT64_MIN, "Cannot represent " + *this + " as 64-bit integer, provided value is " + (sign == 1 ? "too big." : "too small."));
// Check for overflow/underflow, with special case to ensure INT64_MIN does not result in error
bool overflow = ((binary > INT64_MAX / 2) && (sign == 1 || (sign == -1 && binary != (INT64_MAX >> 1) + 1))) || (sign == -1 && binary == (INT64_MAX >> 1) + 1 && c > '0');
ERR_FAIL_COND_V_MSG(overflow, sign == 1 ? INT64_MAX : INT64_MIN, "Cannot represent " + *this + " as 64-bit integer, provided value is " + (sign == 1 ? "too big." : "too small."));
binary *= 2;
binary += n;
s++;
@ -1713,7 +1715,8 @@ int64_t String::to_int() const {
for (int i = 0; i < to; i++) {
CharType c = operator[](i);
if (c >= '0' && c <= '9') {
ERR_FAIL_COND_V_MSG(integer > INT64_MAX / 10, sign == 1 ? INT64_MAX : INT64_MIN, "Cannot represent " + *this + " as an integer, provided value is " + (sign == 1 ? "too big." : "too small."));
bool overflow = (integer > INT64_MAX / 10) || (integer == INT64_MAX / 10 && ((sign == 1 && c > '7') || (sign == -1 && c > '8')));
ERR_FAIL_COND_V_MSG(overflow, sign == 1 ? INT64_MAX : INT64_MIN, "Cannot represent " + *this + " as 64-bit integer, provided value is " + (sign == 1 ? "too big." : "too small."));
integer *= 10;
integer += c - '0';
@ -1741,7 +1744,8 @@ int64_t String::to_int(const char *p_str, int p_len) {
for (int i = 0; i < to; i++) {
char c = p_str[i];
if (c >= '0' && c <= '9') {
ERR_FAIL_COND_V_MSG(integer > INT64_MAX / 10, sign == 1 ? INT64_MAX : INT64_MIN, "Cannot represent " + String(p_str).substr(0, to) + " as an integer, provided value is " + (sign == 1 ? "too big." : "too small."));
bool overflow = (integer > INT64_MAX / 10) || (integer == INT64_MAX / 10 && ((sign == 1 && c > '7') || (sign == -1 && c > '8')));
ERR_FAIL_COND_V_MSG(overflow, sign == 1 ? INT64_MAX : INT64_MIN, "Cannot represent " + String(p_str).substr(0, to) + " as integer, provided value is " + (sign == 1 ? "too big." : "too small."));
integer *= 10;
integer += c - '0';