Luna/luna/NumberParsing.cpp

#include <NumberParsing.h>

usize _atou(const char** str)
{
    usize val = 0;

    while (_isdigit(**str))
    {
        val = (10 * val) + (**str - '0');
        (*str)++;
    }

    return val;
}

isize _atos(const char** str)
{
    bool neg = false;
    isize val = 0;

    switch (**str)
    {
    case '-':
        neg = true;
        (*str)++;
        break;
    case '+': (*str)++; break;
    default: break;
    }

    while (_isdigit(**str))
    {
        val = (10 * val) + (**str - '0');
        (*str)++;
    }

    return neg ? -val : val;
}

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;
            return false;
        }
        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;
}

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;
            return false;
        }
        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;
}