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//
/// @file ctype.hpp
/// @brief Simple implementations of character comparison functions.
//
// Alee Forth: A portable and concise Forth implementation in modern C++.
// Copyright (C) 2023 Clyne Sullivan <clyne@bitgloo.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
#ifndef ALEEFORTH_CTYPE_HPP
#define ALEEFORTH_CTYPE_HPP
#include <cstdint>
/** Determines the length of a null-terminated string. */
constexpr inline unsigned strlen(const char * const s) {
unsigned i = 0;
while (s[i]) i++;
return i;
}
/** Tests if given character represents whitespace. */
constexpr inline bool isspace(uint8_t c) {
return c == ' ' || c == '\t' || c == '\r' || c == '\n';
}
/** Tests if given character is a numerical digit. */
constexpr inline bool isdigit(uint8_t c) {
return c >= '0' && c <= '9';
}
/** Tests if given character is an uppercase letter. */
constexpr inline bool isupper(uint8_t c) {
return c >= 'A' && c <= 'Z';
}
/** Tests if given character is a lowercase letter. */
constexpr inline bool islower(uint8_t c) {
return c >= 'a' && c <= 'z';
}
/** Tests if given character is a letter. */
constexpr inline bool isalpha(uint8_t c) {
return isupper(c) || (c >= 'a' && c <= 'z');
}
#endif // ALEEFORTH_CTYPE_HPP
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