124 lines
2.6 KiB
C++
124 lines
2.6 KiB
C++
/*
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* Copyright 2015 - 2025 gary@drinkingtea.net
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/.
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*/
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#pragma once
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#include "def.hpp"
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#include "types.hpp"
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#include "typetraits.hpp"
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OX_CLANG_NOWARN_BEGIN(-Wunsafe-buffer-usage)
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namespace ox {
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template<typename T1, typename T2>
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constexpr T1 strncpy(T1 dest, T2 src, std::size_t maxLen) noexcept {
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using T1Type = typename ox::remove_reference<decltype(dest[0])>::type;
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std::size_t i = 0;
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while (i < maxLen && src[i]) {
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dest[i] = static_cast<T1Type>(src[i]);
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++i;
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}
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// set null terminator
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dest[i] = 0;
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return dest;
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}
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[[nodiscard]]
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constexpr size_t strnlen_s(const char *str, size_t const maxLen) noexcept {
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if (!str) [[unlikely]] {
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return 0;
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}
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size_t len = 0;
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for (; len < maxLen && str[len]; len++);
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return len;
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}
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template<typename T>
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[[nodiscard]]
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constexpr auto strlen(T const&str1) noexcept {
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std::size_t len = 0;
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for (; str1[len]; len++);
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return len;
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}
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template<typename T1, typename T2>
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[[nodiscard]]
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constexpr int strcmp(const T1 &str1, const T2 &str2) noexcept {
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auto retval = 0;
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auto i = 0u;
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while (str1[i] || str2[i]) {
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if (str1[i] < str2[i]) {
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retval = -1;
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break;
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} else if (str1[i] > str2[i]) {
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retval = 1;
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break;
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}
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i++;
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}
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return retval;
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}
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template<typename T1, typename T2>
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[[nodiscard]]
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constexpr int strncmp(T1 const&str1, T2 const&str2, const std::size_t maxLen) noexcept {
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auto retval = 0;
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std::size_t i = 0;
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while (i < maxLen && (str1[i] || str2[i])) {
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if (str1[i] < str2[i]) {
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retval = -1;
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break;
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} else if (str1[i] > str2[i]) {
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retval = 1;
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break;
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}
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i++;
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}
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return retval;
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}
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[[nodiscard]]
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constexpr const char *strchr(const char *str, int character, std::size_t maxLen = 0xFFFFFFFF) noexcept {
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for (std::size_t i = 0; i <= maxLen; i++) {
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if (str[i] == character) {
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return &str[i];
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} else if (str[i] == 0) {
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return nullptr;
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}
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}
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return nullptr;
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}
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[[nodiscard]]
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constexpr char *strchr(char *str, int character, std::size_t maxLen = 0xFFFFFFFF) noexcept {
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for (std::size_t i = 0; i < maxLen; i++) {
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if (str[i] == character) {
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return &str[i];
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} else if (str[i] == 0) {
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return nullptr;
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}
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}
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return nullptr;
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}
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[[nodiscard]]
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constexpr int lastIndexOf(const auto &str, int character, std::size_t maxLen = 0xFFFFFFFF) noexcept {
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int retval = -1;
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for (std::size_t i = 0; i < maxLen && str[i]; i++) {
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if (str[i] == character) {
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retval = static_cast<int>(i);
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}
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}
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return retval;
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}
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}
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OX_CLANG_NOWARN_END
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