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Add _strtoi and _strtou

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apio 2022-11-19 15:27:55 +01:00
parent bad856afe0
commit 56c2ca3381
1 changed files with 113 additions and 0 deletions
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113
luna/NumberParsing.h
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@ -38,3 +38,116 @@ inline isize _atos(const char** str)
return neg ? -val : val;
}
inline usize _strtou(const char* str, const char** endptr, int base)
{
usize val = 0;
auto valid_digit = [](int _base, char c) -> bool {
if (_base <= 10)
{
if (!_isdigit(c)) return false;
if ((c - '0') < _base) return true;
}
else
{
if (!_isalnum(c)) return false;
if (_isdigit(c)) return true;
bool lower = _islower(c);
if (((c - lower ? 'a' : 'A') + 10) < _base) return true;
return false;
}
};
auto to_digit = [](char c) -> usize {
if (_isdigit(c)) return c - '0';
if (_islower(c)) return (c - 'a') + 10;
return (c - 'A') + 10;
};
while (_isspace(*str)) str++;
if ((base == 0 || base == 16) && *str == '0')
{
str++;
if (_tolower(*str) == 'x')
{
base = 16;
str++;
}
else if (base == 0)
base = 8;
}
else if (base == 0)
base = 10;
while (valid_digit(base, *str))
{
val = (base * val) + to_digit(*str);
str++;
}
if (endptr) *endptr = str;
return val;
}
inline isize _strtoi(const char* str, const char** endptr, int base)
{
isize val = 0;
bool negative = false;
auto valid_digit = [](int _base, char c) -> bool {
if (_base <= 10)
{
if (!_isdigit(c)) return false;
if ((c - '0') < _base) return true;
}
else
{
if (!_isalnum(c)) return false;
if (_isdigit(c)) return true;
bool lower = _islower(c);
if (((c - lower ? 'a' : 'A') + 10) < _base) return true;
return false;
}
};
auto to_digit = [](char c) -> isize {
if (_isdigit(c)) return c - '0';
if (_islower(c)) return (c - 'a') + 10;
return (c - 'A') + 10;
};
while (_isspace(*str)) str++;
if (*str == '-' || *str == '+')
{
if (*str == '-') negative = true;
str++;
}
if ((base == 0 || base == 16) && *str == '0')
{
str++;
if (_tolower(*str) == 'x')
{
base = 16;
str++;
}
else if (base == 0)
base = 8;
}
else if (base == 0)
base = 10;
while (valid_digit(base, *str))
{
val = (base * val) + to_digit(*str);
str++;
}
if (endptr) *endptr = str;
return negative ? -val : val;
}