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AK: Add convert_to_uint_from_octal

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Xavier Defrang 2021-12-20 21:06:54 +01:00 • committed by Brian Gianforcaro
parent 6ca34f5647
commit 9e97823ff8
3 changed files with 91 additions and 0 deletions
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35
AK/StringUtils.cpp
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@ -191,6 +191,41 @@ template Optional<u16> convert_to_uint_from_hex(StringView str, TrimWhitespace);
template Optional<u32> convert_to_uint_from_hex(StringView str, TrimWhitespace);
template Optional<u64> convert_to_uint_from_hex(StringView str, TrimWhitespace);
template<typename T>
Optional<T> convert_to_uint_from_octal(StringView str, TrimWhitespace trim_whitespace)
{
auto string = trim_whitespace == TrimWhitespace::Yes
? str.trim_whitespace()
: str;
if (string.is_empty())
return {};
T value = 0;
const auto count = string.length();
const T upper_bound = NumericLimits<T>::max();
for (size_t i = 0; i < count; i++) {
char digit = string[i];
u8 digit_val;
if (value > (upper_bound >> 3))
return {};
if (digit >= '0' && digit <= '7') {
digit_val = digit - '0';
} else {
return {};
}
value = (value << 3) + digit_val;
}
return value;
}
template Optional<u8> convert_to_uint_from_octal(StringView str, TrimWhitespace);
template Optional<u16> convert_to_uint_from_octal(StringView str, TrimWhitespace);
template Optional<u32> convert_to_uint_from_octal(StringView str, TrimWhitespace);
template Optional<u64> convert_to_uint_from_octal(StringView str, TrimWhitespace);
bool equals_ignoring_case(StringView a, StringView b)
{
if (a.length() != b.length())