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fix: singned integer overflow in parse_uint()

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方而静 2024-06-07 12:42:48 +08:00
parent f9c00fd706
commit b222fa320b
Signed by: szTom
GPG Key ID: 072D999D60C6473C
2 changed files with 9 additions and 11 deletions
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18
src/lexer.cpp
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@ -509,11 +509,11 @@ IntParsingResult parse_uint(std::string_view text, i64* out, int base){
if(base == 10){
// 10-base 12334
if(text.length() == 0) return IntParsingResult::Failure;
constexpr i64 max_i64 = std::numeric_limits<i64>::max();
for(char c : text){
if(c >= '0' && c <= '9'){
i64 prev_out = *out;
if (*out > (max_i64 - (c - '0')) / 10) return IntParsingResult::Overflow;
*out = (*out * 10) + (c - '0');
if(*out < prev_out) return IntParsingResult::Overflow;
}else{
return IntParsingResult::Failure;
}
@ -523,11 +523,11 @@ IntParsingResult parse_uint(std::string_view text, i64* out, int base){
// 2-base 0b101010
if(f_startswith_2(text, "0b")) text.remove_prefix(2);
if(text.length() == 0) return IntParsingResult::Failure;
constexpr i64 mask = i64{1} << 63;
for(char c : text){
if(c == '0' || c == '1'){
i64 prev_out = *out;
if (*out & mask) return IntParsingResult::Overflow;
*out = (*out << 1) | (c - '0');
if(*out < prev_out) return IntParsingResult::Overflow;
}else{
return IntParsingResult::Failure;
}
@ -537,11 +537,11 @@ IntParsingResult parse_uint(std::string_view text, i64* out, int base){
// 8-base 0o123
if(f_startswith_2(text, "0o")) text.remove_prefix(2);
if(text.length() == 0) return IntParsingResult::Failure;
constexpr i64 mask = i64{7} << 60;
for(char c : text){
if(c >= '0' && c <= '7'){
i64 prev_out = *out;
if (*out & mask) return IntParsingResult::Overflow;
*out = (*out << 3) | (c - '0');
if(*out < prev_out) return IntParsingResult::Overflow;
}else{
return IntParsingResult::Failure;
}
@ -551,17 +551,15 @@ IntParsingResult parse_uint(std::string_view text, i64* out, int base){
// 16-base 0x123
if(f_startswith_2(text, "0x")) text.remove_prefix(2);
if(text.length() == 0) return IntParsingResult::Failure;
constexpr i64 mask = i64{15} << 59;
for(char c : text){
i64 prev_out = *out;
if (*out & mask) return IntParsingResult::Overflow;
if(c >= '0' && c <= '9'){
*out = (*out << 4) | (c - '0');
if(*out < prev_out) return IntParsingResult::Overflow;
}else if(c >= 'a' && c <= 'f'){
*out = (*out << 4) | (c - 'a' + 10);
if(*out < prev_out) return IntParsingResult::Overflow;
}else if(c >= 'A' && c <= 'F'){
*out = (*out << 4) | (c - 'A' + 10);
if(*out < prev_out) return IntParsingResult::Overflow;
}else{
return IntParsingResult::Failure;
}

2
tests/01_int.py
View File

@ -142,7 +142,7 @@ except ZeroDivisionError:
assert not 1 < 2 > 3
try:
x = eval("231231312312312312312312312312312312314354657553423345632")
x = eval("0x12345678901234567890")
print(f"eval should fail, but got {x!r}")
exit(1)
except SyntaxError: