Separate string view, implement string appending semantics.

1 files changed, 1131 insertions, 0 deletions

diff --git a/source/fud_string_view.cpp b/source/fud_string_view.cpp
new file mode 100644
index 0000000..4795cf2
--- /dev/null
+++ b/source/fud_string_view.cpp
@@ -0,0 +1,1131 @@
+/*
+ * LibFud
+ * Copyright 2024 Dominick Allen
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "fud_string_view.hpp"
+
+#include "fud_string.hpp"
+
+namespace fud {
+
+StringView::StringView(const String& fudString) noexcept : StringView(fudString.length(), fudString.data())
+{
+}
+
+bool StringView::nullTerminated() const
+{
+    return m_data != nullptr && m_data[m_length] == '\0';
+}
+
+bool StringView::utf8Valid() const
+{
+    if (m_data == nullptr) {
+        return false;
+    }
+
+    for (size_t idx = 0; idx < m_length;) {
+        if (Ascii::valid(m_data[idx])) {
+            idx++;
+        } else if (idx + 1 < m_length && Utf82Byte::valid(m_data[idx], m_data[idx + 1])) {
+            idx += 2;
+        } else if (idx + 2 < m_length && Utf83Byte::valid(m_data[idx], m_data[idx + 1], m_data[idx + 2])) {
+            idx += 3;
+        } else if (
+            idx + 3 < m_length && Utf84Byte::valid(m_data[idx], m_data[idx + 1], m_data[idx + 2], m_data[idx + 3])) {
+            idx += 4;
+        } else {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+Result<size_t, FudStatus> StringView::skipWhitespace()
+{
+    using RetType = Result<size_t, FudStatus>;
+    if (m_data == nullptr) {
+        return RetType::error(FudStatus::NullPointer);
+    }
+    size_t index = 0;
+    while (m_length > 0 && char_is_space(static_cast<char>(m_data[0]))) {
+        m_data++;
+        m_length--;
+        index++;
+    }
+
+    return RetType::okay(index);
+}
+
+Result<size_t, FudStatus> StringView::trimWhitespace()
+{
+    using RetType = Result<size_t, FudStatus>;
+    if (m_data == nullptr) {
+        return RetType::error(FudStatus::NullPointer);
+    }
+
+    size_t count = 0;
+    while (m_length > 0 && char_is_space(static_cast<char>(m_data[m_length - 1]))) {
+        m_length--;
+        count++;
+    }
+
+    return RetType::okay(count);
+}
+
+#if 0
+
+FudStatus fud_string_truncate(ExtBasicString* source, ssize_t newLength)
+{
+    if (source == nullptr) {
+        return FudStatus::NullPointer;
+    }
+    StringBorrow wrapper{*source};
+    if (!wrapper.valid()) {
+        return FudStatus::StringInvalid;
+    }
+
+    if ((newLength > 0 && static_cast<size_t>(newLength) > source->m_length) ||
+        (static_cast<size_t>(-newLength) > source->m_length)) {
+        return FudStatus::InvalidInput;
+    }
+
+    if (newLength < 0) {
+        source->m_length = source->m_length - static_cast<size_t>(-newLength);
+    } else {
+        source->m_length = static_cast<size_t>(newLength);
+    }
+
+    return wrapper.nullTerminate();
+}
+
+FudStatus fud_string_reverse(ExtBasicString* source)
+{
+    if (source == nullptr || source->m_data == nullptr) {
+        return FudStatus::NullPointer;
+    }
+    return fud_string_reverse_substring(source, StringView{source->m_length, source->m_data});
+}
+
+FudStatus fud_string_reverse_substring(ExtBasicString* source, StringView subString)
+{
+    auto dataOffset = subString.data - source->m_data;
+    if (dataOffset < 0 || static_cast<size_t>(dataOffset) > source->m_length) {
+        return FudStatus::InvalidInput;
+    }
+    if (static_cast<size_t>(dataOffset) + subString.length > source->m_length) {
+        return FudStatus::InvalidInput;
+    }
+
+    if (source == nullptr || source->m_data == nullptr) {
+        return FudStatus::NullPointer;
+    }
+
+    StringView view{subString};
+
+    size_t index = 0;
+    auto* data = source->m_data + dataOffset;
+    while (index < subString.length) {
+        if (ext_lib_char_is_ascii(static_cast<char>(data[index]))) {
+            index++;
+            continue;
+        }
+        auto utf8 = FudUtf8::fromStringView(view, index);
+        if (!utf8.valid()) {
+            return ExtUtf8Invalid;
+        }
+        const auto* utf8Data = utf8.data();
+        if (utf8Data == nullptr) {
+            return ExtFailure;
+        }
+        auto utf8Size = utf8.size();
+        switch (utf8Size) {
+        case 2:
+            data[index] = utf8Data[1];
+            data[index + 1] = utf8Data[0];
+            break;
+        case 3:
+            data[index] = utf8Data[2];
+            data[index + 2] = utf8Data[0];
+            break;
+        case 4:
+            data[index] = utf8Data[3];
+            data[index + 1] = utf8Data[2];
+            data[index + 2] = utf8Data[1];
+            data[index + 3] = utf8Data[0];
+            break;
+        default:
+            return ExtFailure;
+        }
+        index += utf8Size;
+    }
+
+    ext_lib::DataView<uint8_t> dataView{subString.length, data};
+    reverse(dataView);
+
+    return FudStatus::Success;
+}
+
+FudStatus fud_string_compare(StringView levo, StringView dextro, int* difference)
+{
+    if (anyAreNull(difference, levo.data, dextro.data)) {
+        return FudStatus::NullPointer;
+    }
+
+    int diff = 0;
+    size_t index = 0;
+    while (diff == 0 && index < levo.length && index < dextro.length) {
+        diff = levo.data[index] - dextro.data[index];
+        index++;
+    }
+
+    if (diff != 0 || levo.length == dextro.length) {
+        /* nothing to do */
+    } else if (levo.length > dextro.length) {
+        diff = static_cast<int>(levo.data[index]);
+    } else {
+        diff = -static_cast<int>(dextro.data[index]);
+    }
+
+    *difference = diff;
+    return FudStatus::Success;
+}
+
+FudStatus fud_string_chr(StringView extStringView, char character, size_t* index)
+{
+    if (anyAreNull(extStringView.data, index)) {
+        return FudStatus::NullPointer;
+    }
+
+    bool found = false;
+    for (size_t localIndex = 0; localIndex < extStringView.length; ++localIndex) {
+        if (extStringView.data[localIndex] == static_cast<uint8_t>(character)) {
+            *index = localIndex;
+            found = true;
+            break;
+        }
+    }
+
+    if (found) {
+        return FudStatus::Success;
+    }
+
+    return ExtNotFound;
+}
+
+FudStatus fud_string_unicode_chr(StringView extString, const ExtUtf8* unicode, size_t* index)
+{
+    if (anyAreNull(extString.data, unicode, index)) {
+        return FudStatus::NullPointer;
+    }
+
+    if (!unicode->valid()) {
+        return ExtUtf8Invalid;
+    }
+
+    size_t charSize = unicode->size();
+    ExtDebugAssert(charSize != 0);
+    const uint8_t* dataMem = unicode->data();
+    ExtDebugAssert(dataMem != nullptr);
+
+    std::array<uint8_t, 4> localData{};
+    auto copyStatus = ExtCopyMem(localData.data(), localData.size(), dataMem, charSize);
+    ExtDebugAssert(copyStatus == FudStatus::Success);
+
+    for (size_t sIdx = 0; sIdx + charSize - 1 < extString.length;) {
+
+        auto localChar = FudUtf8::fromStringView(extString, sIdx);
+
+        if (!localChar.valid()) {
+            return ExtUtf8Invalid;
+        }
+
+        if (localChar.m_variant == unicode->m_variant) {
+            *index = sIdx;
+            return FudStatus::Success;
+        }
+
+        sIdx += localChar.size();
+    }
+
+    return ExtNotFound;
+}
+
+namespace ext_lib {
+
+FudStatus fud_string_span_c_api(
+    const StringView& inputView,
+    const StringView& characterSetString,
+    StringView& result,
+    bool inSet)
+{
+    size_t firstIndex = inputView.length;
+
+    size_t sIdx = 0;
+    while (sIdx < firstIndex) {
+        auto stringChar = FudUtf8::fromStringView(inputView, sIdx);
+        if (!stringChar.valid()) {
+            return ExtUtf8Invalid;
+        }
+
+        size_t cIdx = 0;
+        bool found = false;
+        while (firstIndex > 0 && cIdx < firstIndex && cIdx < characterSetString.length) {
+            auto setChar = FudUtf8::fromStringView(characterSetString, cIdx);
+            if (!setChar.valid()) {
+                return ExtUtf8Invalid;
+            }
+
+            if (stringChar == setChar) {
+                found = true;
+            }
+
+            cIdx += setChar.size();
+        }
+
+        if (!inSet && found) {
+            firstIndex = sIdx;
+        } else if (inSet && !found) {
+            if (sIdx > 0) {
+                firstIndex = sIdx;
+            }
+            break;
+        }
+
+        sIdx += stringChar.size();
+    }
+
+    if (firstIndex < inputView.length) {
+        result.length = inputView.length - firstIndex;
+        result.data = inputView.data + firstIndex;
+        return FudStatus::Success;
+    }
+
+    return ExtNotFound;
+}
+
+FudStatus fud_string_span_set(StringView inputView, const ExtUtf8Set* characterSet, StringView* stringView, bool inSet)
+{
+    if (anyAreNull(inputView.data, characterSet, stringView)) {
+        return FudStatus::NullPointer;
+    }
+
+    if (!characterSet->valid()) {
+        return ExtUtf8Invalid;
+    }
+
+    size_t firstIndex = inputView.length;
+    size_t sIdx = 0;
+    while (sIdx < firstIndex) {
+        auto localChar = FudUtf8::fromStringView(inputView, sIdx);
+        if (!localChar.valid()) {
+            return ExtUtf8Invalid;
+        }
+
+        bool found = characterSet->contains(localChar);
+
+        if (!inSet && found) {
+            firstIndex = sIdx;
+        } else if (inSet && !found) {
+            if (sIdx > 0) {
+                firstIndex = sIdx;
+            }
+            break;
+        }
+
+        sIdx += localChar.size();
+    }
+
+    if (firstIndex < inputView.length) {
+        stringView->length = inputView.length - firstIndex;
+        stringView->data = inputView.data + firstIndex;
+        return FudStatus::Success;
+    }
+
+    return ExtNotFound;
+}
+
+} // namespace ext_lib
+
+FudStatus fud_string_span(StringView extString, StringView characterSetString, StringView* result)
+{
+    if (result == nullptr) {
+        return FudStatus::NullPointer;
+    }
+
+    const StringView inputView{extString};
+    const StringView characterSet{characterSetString};
+
+    return fud_string_span_c_api(inputView, characterSet, *result, true);
+}
+
+FudStatus fud_string_c_span(StringView extString, StringView characterSetString, StringView* result)
+{
+    if (result == nullptr) {
+        return FudStatus::NullPointer;
+    }
+
+    const StringView inputView{extString};
+    const StringView characterSet{characterSetString};
+
+    return fud_string_span_c_api(inputView, characterSet, *result, false);
+}
+
+FudStatus fud_string_span_set(StringView extString, const ExtUtf8Set* characterSet, StringView* stringView)
+{
+    return ext_lib::fud_string_span_set(extString, characterSet, stringView, true);
+}
+
+FudStatus fud_string_c_span_set(StringView extString, const ExtUtf8Set* characterSet, StringView* stringView)
+{
+    return ext_lib::fud_string_span_set(extString, characterSet, stringView, false);
+}
+
+FudStatus fud_string_find_substring(StringView haystack, StringView needle, StringView* stringView)
+{
+    if (anyAreNull(haystack.data, needle.data, stringView)) {
+        return FudStatus::NullPointer;
+    }
+
+    if (needle.length > haystack.length) {
+        return ExtNotFound;
+    }
+
+    if (needle.length == 1) {
+        size_t index = 0;
+        auto chrFindStatus = fud_string_chr(haystack, static_cast<char>(needle.data[0]), &index);
+        if (chrFindStatus == FudStatus::Success) {
+            stringView->data = haystack.data + index;
+            stringView->length = 1;
+        }
+        return chrFindStatus;
+    }
+
+    size_t haystackIdx = 0;
+    while (haystackIdx < haystack.length - needle.length) {
+        StringView lhs;
+        lhs.data = haystack.data + haystackIdx;
+        lhs.length = haystack.length - haystackIdx;
+        size_t lhsIndex = 0;
+        auto chrFindStatus = fud_string_chr(lhs, static_cast<char>(needle.data[0]), &lhsIndex);
+        if (chrFindStatus != FudStatus::Success) {
+            return chrFindStatus;
+        }
+        haystackIdx += lhsIndex;
+        // GE or GT?
+        if (haystackIdx + needle.length >= haystack.length) {
+            break;
+        }
+        lhs.data = haystack.data + haystackIdx;
+        lhs.length = needle.length;
+
+        int difference = -1;
+        auto cmpStatus = fud_string_compare(lhs, needle, &difference);
+        ExtDebugAssert(cmpStatus == FudStatus::Success);
+        if (difference == 0) {
+            stringView->data = lhs.data;
+            stringView->length = lhs.length;
+            return FudStatus::Success;
+        }
+        haystackIdx++;
+    }
+
+    return ExtNotFound;
+}
+
+namespace ext_lib {
+
+FudStatus skipWhitespace(StringView& view, size_t& skipIndex)
+{
+    auto skipResult = view.skipWhitespace();
+    if (skipResult.isError()) {
+        return skipResult.getError();
+    }
+    skipIndex = skipResult.getOkay();
+    if (view.length < 1) {
+        return FudStatus::InvalidInput;
+    }
+    return FudStatus::Success;
+}
+
+} // namespace ext_lib
+
+FudStatus fud_string_view_skip_whitespace(StringView* view)
+{
+    if (view == nullptr) {
+        return FudStatus::NullPointer;
+    }
+
+    StringView sView{*view};
+    auto skipResult = sView.skipWhitespace();
+    if (skipResult.isError()) {
+        return skipResult.getError();
+    }
+    view->data = sView.data;
+    view->length = sView.length;
+    return FudStatus::Success;
+}
+
+FudStatus fud_string_view_trim_whitespace(StringView* view)
+{
+    if (view == nullptr) {
+        return FudStatus::NullPointer;
+    }
+
+    StringView sView{*view};
+    auto skipResult = sView.trimWhitespace();
+    if (skipResult.isError()) {
+        return skipResult.getError();
+    }
+    view->data = sView.data;
+    view->length = sView.length;
+    return FudStatus::Success;
+}
+
+namespace impl {
+constexpr ext_lib::Array<int8_t, 256> AsciiLookup{
+    {-1, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
+     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 0,  1,  2,  3,  4,  5,  6,  7,  8,  9,
+     -2, -2, -2, -2, -2, -2, -2, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
+     32, 33, 34, 35, -2, -2, -2, -2, -2, -2, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28,
+     29, 30, 31, 32, 33, 34, 35, -2, -2, -2, -2, -2, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3,
+     -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3,
+     -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3,
+     -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3,
+     -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3}};
+
+// NOLINTBEGIN(readability-magic-numbers)
+static_assert(AsciiLookup[static_cast<size_t>('0')] == 0);
+static_assert(AsciiLookup[static_cast<size_t>('9')] == 9);
+static_assert(AsciiLookup[static_cast<size_t>('a')] == 10);
+static_assert(AsciiLookup[static_cast<size_t>('A')] == 10);
+static_assert(AsciiLookup[static_cast<size_t>('f')] == 15);
+static_assert(AsciiLookup[static_cast<size_t>('F')] == 15);
+static_assert(AsciiLookup[127] == -2);
+static_assert(AsciiLookup[128] == -3);
+static_assert(AsciiLookup[255] == -3);
+// NOLINTEND(readability-magic-numbers)
+
+FudStatus determineRadix(StringView input, uint8_t& radix, size_t& index)
+{
+    if (input.length < 1) {
+        return FudStatus::InvalidInput;
+    }
+
+    if (input.length == 1 && input.data[0] == '0') {
+        radix = ExtRadixOctal;
+        return FudStatus::Success;
+    }
+
+    if (input.length == 1) {
+        radix = ExtRadixDecimal;
+        return FudStatus::Success;
+    }
+
+    if (input.data[0] == '0' && (input.data[1] == 'x' || input.data[1] == 'X')) {
+        radix = ExtRadixHexadecimal;
+        index += 2;
+        return FudStatus::Success;
+    }
+
+    if (input.data[0] == '0') {
+        auto nextChar = input.data[1];
+        auto nextVal = AsciiLookup[nextChar];
+        if (nextVal >= 0 && nextVal < ExtRadixOctal) {
+            radix = ExtRadixOctal;
+            return FudStatus::Success;
+        }
+        if (nextVal >= ExtRadixOctal) {
+            return FudStatus::InvalidInput;
+        }
+    }
+
+    radix = ExtRadixDecimal;
+    return FudStatus::Success;
+}
+
+FudStatus getRadix(StringView& view, uint8_t& radix, size_t& skipIndex)
+{
+    if (radix == 0) {
+        size_t radixIndex = 0;
+        auto status = determineRadix(view, radix, radixIndex);
+        if (status != FudStatus::Success) {
+            return status;
+        }
+        skipIndex += radixIndex;
+        view.data += radixIndex;
+        view.length -= radixIndex;
+    } else if (radix == ExtRadixHexadecimal && view.length > 2 && (view.data[1] == 'x' || view.data[1] == 'X')) {
+        skipIndex += 2;
+        view.data += 2;
+        view.length -= 2;
+    }
+    return FudStatus::Success;
+}
+
+FudStatus checkNegative(StringView& view, bool& isNegative, size_t& skipIndex)
+{
+    isNegative = view.data[0] == '-';
+    if (isNegative && view.length == 1) {
+        return FudStatus::InvalidInput;
+    }
+    if (isNegative) {
+        skipIndex += 1;
+        view.data++;
+        view.length--;
+    }
+    return FudStatus::Success;
+}
+
+FudStatus checkPlusSigned(StringView& view, size_t& skipIndex)
+{
+    auto isPlusSigned = view.data[0] == '+';
+    if (isPlusSigned && view.length == 1) {
+        return FudStatus::InvalidInput;
+    }
+    if (isPlusSigned) {
+        skipIndex += 1;
+        view.data++;
+        view.length--;
+    }
+    return FudStatus::Success;
+}
+
+template <typename T>
+FudStatus stringViewToUnsignedInteger(StringView input, T& number, uint8_t specifiedRadix, size_t& index)
+{
+    if (input.data == nullptr) {
+        return FudStatus::NullPointer;
+    }
+
+    if (specifiedRadix == 1 || specifiedRadix > ExtMaxRadix || input.length < 1) {
+        return FudStatus::InvalidInput;
+    }
+
+    uint8_t radix = specifiedRadix;
+
+    StringView view{input};
+    size_t skipIndex = 0;
+    auto status = ext_lib::skipWhitespace(view, skipIndex);
+    if (status != FudStatus::Success) {
+        return status;
+    }
+
+    status = checkPlusSigned(view, skipIndex);
+    if (status != FudStatus::Success) {
+        return FudStatus::InvalidInput;
+    }
+
+    status = getRadix(view, radix, skipIndex);
+
+    T num = 0;
+    size_t digitIndex = 0;
+
+    while (digitIndex < view.length) {
+        auto digitResult = impl::AsciiLookup[view.data[digitIndex]];
+        if (digitResult >= radix || digitResult < 0) {
+            break;
+        }
+
+        auto digit = static_cast<uint8_t>(digitResult);
+        if (std::numeric_limits<T>::max() / radix < num) {
+            return FudStatus::InvalidInput;
+        }
+        num *= radix;
+        if (std::numeric_limits<T>::max() - digit < num) {
+            return FudStatus::InvalidInput;
+        }
+        num += digit;
+        digitIndex++;
+    }
+    if (digitIndex < 1) {
+        return FudStatus::InvalidInput;
+    }
+
+    index = skipIndex + digitIndex;
+    number = num;
+
+    return FudStatus::Success;
+}
+
+template <typename T>
+FudStatus stringViewToUnsignedInteger(StringView input, T* number, uint8_t specifiedRadix, size_t* index)
+{
+    if (anyAreNull(input.data, number)) {
+        return FudStatus::NullPointer;
+    }
+
+    size_t localIndex = 0;
+
+    auto status = stringViewToUnsignedInteger(input, *number, specifiedRadix, localIndex);
+    if (status == FudStatus::Success && index != nullptr) {
+        *index = localIndex;
+    }
+    return status;
+}
+
+template <typename T>
+FudStatus viewToSignedIntPositive(StringView view, uint8_t radix, size_t& digitIndex, T& num)
+{
+    digitIndex = 0;
+    while (digitIndex < view.length) {
+        int8_t digitResult = impl::AsciiLookup[view.data[digitIndex]];
+        if (digitResult >= radix) {
+            return FudStatus::InvalidInput;
+        }
+        if (digitResult < 0) {
+            break;
+        }
+        auto digit = static_cast<uint8_t>(digitResult);
+        if (std::numeric_limits<T>::max() / radix < num) {
+            return FudStatus::InvalidInput;
+        }
+        num = static_cast<T>(num * radix);
+        if (std::numeric_limits<T>::max() - digit < num) {
+            return FudStatus::InvalidInput;
+        }
+        num = static_cast<T>(num + digit);
+        digitIndex++;
+    }
+
+    return FudStatus::Success;
+}
+
+template <typename T>
+FudStatus viewToSignedIntNegative(StringView view, uint8_t radix, size_t& digitIndex, T& num)
+{
+    digitIndex = 0;
+    while (digitIndex < view.length) {
+        int8_t digitResult = impl::AsciiLookup[view.data[digitIndex]];
+        if (digitResult >= radix) {
+            return FudStatus::InvalidInput;
+        }
+        if (digitResult < 0) {
+            break;
+        }
+        auto digit = static_cast<uint8_t>(digitResult);
+        if ((std::numeric_limits<T>::min() / radix > num)) {
+            return FudStatus::InvalidInput;
+        }
+        num = static_cast<T>(num * radix);
+        if (std::numeric_limits<T>::min() + digit > num) {
+            return FudStatus::InvalidInput;
+        }
+        num = static_cast<T>(num - digit);
+        digitIndex++;
+    }
+
+    return FudStatus::Success;
+}
+
+template <typename T>
+FudStatus stringViewToSignedInteger(StringView input, T& number, uint8_t specifiedRadix, size_t& index)
+{
+    if (input.data == nullptr) {
+        return FudStatus::NullPointer;
+    }
+
+    auto radix = specifiedRadix;
+
+    StringView view{input};
+    size_t skipIndex = 0;
+    auto status = ext_lib::skipWhitespace(view, skipIndex);
+    if (status != FudStatus::Success) {
+        return status;
+    }
+
+    bool isNegative = false;
+    status = checkNegative(view, isNegative, skipIndex);
+    if (status != FudStatus::Success) {
+        return FudStatus::InvalidInput;
+    }
+
+    if (!isNegative) {
+        status = checkPlusSigned(view, skipIndex);
+        if (status != FudStatus::Success) {
+            return FudStatus::InvalidInput;
+        }
+    }
+
+    status = getRadix(view, radix, skipIndex);
+
+    T num = 0;
+    size_t digitIndex = 0;
+
+    if (isNegative) {
+        status = viewToSignedIntNegative(view, radix, digitIndex, num);
+    } else {
+        status = viewToSignedIntPositive(view, radix, digitIndex, num);
+    }
+    if (status != FudStatus::Success) {
+        return status;
+    }
+
+    if (digitIndex < 1) {
+        return FudStatus::InvalidInput;
+    }
+
+    index = skipIndex + digitIndex;
+    number = num;
+    return FudStatus::Success;
+}
+
+template <typename T>
+FudStatus stringViewToSignedInteger(StringView input, T* number, uint8_t specifiedRadix, size_t* index)
+{
+    if (anyAreNull(input.data, number)) {
+        return FudStatus::NullPointer;
+    }
+
+    if (specifiedRadix == 1 || specifiedRadix > ExtMaxRadix || input.length < 1) {
+        return FudStatus::InvalidInput;
+    }
+
+    size_t localIndex = 0;
+    auto status = stringViewToSignedInteger(input, *number, specifiedRadix, localIndex);
+    if (status == FudStatus::Success && index != nullptr) {
+        *index = localIndex;
+    }
+    return status;
+}
+
+} // namespace impl
+
+FudStatus fud_string_to_uint8(StringView input, uint8_t* number, uint8_t specifiedRadix, size_t* index)
+{
+    return impl::stringViewToUnsignedInteger(input, number, specifiedRadix, index);
+}
+
+FudStatus fud_string_to_uint16(StringView input, uint16_t* number, uint8_t specifiedRadix, size_t* index)
+{
+    return impl::stringViewToUnsignedInteger(input, number, specifiedRadix, index);
+}
+
+FudStatus fud_string_to_uint32(StringView input, uint32_t* number, uint8_t specifiedRadix, size_t* index)
+{
+    return impl::stringViewToUnsignedInteger(input, number, specifiedRadix, index);
+}
+
+FudStatus fud_string_to_uint64(StringView input, uint64_t* number, uint8_t specifiedRadix, size_t* index)
+{
+    return impl::stringViewToUnsignedInteger(input, number, specifiedRadix, index);
+}
+
+FudStatus fud_string_to_int8(StringView input, int8_t* number, uint8_t specifiedRadix, size_t* index)
+{
+    return impl::stringViewToSignedInteger(input, number, specifiedRadix, index);
+}
+
+FudStatus fud_string_to_int16(StringView input, int16_t* number, uint8_t specifiedRadix, size_t* index)
+{
+    return impl::stringViewToSignedInteger(input, number, specifiedRadix, index);
+}
+
+FudStatus fud_string_to_int32(StringView input, int32_t* number, uint8_t specifiedRadix, size_t* index)
+{
+    return impl::stringViewToSignedInteger(input, number, specifiedRadix, index);
+}
+
+FudStatus fud_string_to_int64(StringView input, int64_t* number, uint8_t specifiedRadix, size_t* index)
+{
+    return impl::stringViewToSignedInteger(input, number, specifiedRadix, index);
+}
+
+namespace impl {
+
+template <typename T>
+bool isNanOrInf(T& num, StringView& view, T& sign, size_t& digitIndex)
+{
+    if (view.length >= 3) {
+        std::array<uint8_t, 3> letters{{view.data[0], view.data[1], view.data[2]}};
+        ext_lib::mapMut(letters, ext_lib_char_to_lower);
+        if (letters[0] == 'i' && letters[1] == 'n' && letters[2] == 'f') {
+            num = sign * std::numeric_limits<T>::infinity();
+            digitIndex = 3;
+            return true;
+        }
+        if (letters[0] == 'n' && letters[1] == 'a' && letters[2] == 'n') {
+            num = std::numeric_limits<T>::quiet_NaN();
+            ;
+            digitIndex = 3;
+            return true;
+        }
+    }
+    return false;
+}
+
+template <typename T>
+FudStatus getWhole(
+    const StringView view,
+    size_t& digitIndex,
+    T& num,
+    T sign,
+    uint8_t radix,
+    bool& foundDecimal,
+    bool& foundExponent)
+{
+    while (digitIndex < view.length) {
+        auto nextChar = view.data[digitIndex];
+        if (nextChar == '.') {
+            foundDecimal = true;
+            digitIndex++;
+            break;
+        }
+
+        if (radix == ExtRadixDecimal && (nextChar == 'e' || nextChar == 'E')) {
+            foundExponent = true;
+            digitIndex++;
+            break;
+        }
+
+        auto digitResult = impl::AsciiLookup[nextChar];
+        if (digitResult >= radix) {
+            return FudStatus::InvalidInput;
+        }
+        if (digitResult < 0) {
+            break;
+        }
+        auto digit = static_cast<T>(digitResult) * sign;
+        num *= static_cast<T>(radix);
+
+        num += digit;
+        digitIndex++;
+    }
+    return FudStatus::Success;
+}
+
+template <typename T>
+FudStatus getExponent(const StringView& view, size_t& digitIndex, T& num, uint8_t radix)
+{
+    int32_t exponent{};
+    StringView tempView{view.length - digitIndex, view.data + digitIndex};
+    size_t exponentLength{};
+    auto status = tempView.toInt32(exponent, ExtRadixDecimal, exponentLength);
+    if (status != FudStatus::Success) {
+        return status;
+    }
+    digitIndex += exponentLength;
+    num = num * std::pow(static_cast<T>(radix), static_cast<T>(exponent));
+    return FudStatus::Success;
+}
+
+template <typename T>
+FudStatus getFraction(const StringView view, size_t& digitIndex, T& num, T sign, uint8_t radix, bool& foundExponent)
+{
+    auto radixDiv = 1.0F / static_cast<T>(radix);
+    while (digitIndex < view.length) {
+        auto nextChar = view.data[digitIndex];
+        if (radix == ExtRadixDecimal && (nextChar == 'e' || nextChar == 'E')) {
+            foundExponent = true;
+            digitIndex++;
+            break;
+        }
+
+        auto digitResult = impl::AsciiLookup[nextChar];
+        if (digitResult >= radix) {
+            return FudStatus::InvalidInput;
+        }
+        if (digitResult < 0) {
+            break;
+        }
+        auto digit = static_cast<T>(digitResult) * sign;
+        num += digit * radixDiv;
+        radixDiv /= static_cast<T>(radix);
+        digitIndex++;
+    }
+    return FudStatus::Success;
+}
+
+template <typename T>
+FudStatus stringViewToFloat(StringView input, T& number, size_t& index)
+{
+    if (input.data == nullptr) {
+        return FudStatus::NullPointer;
+    }
+
+    if (input.length < 1) {
+        return FudStatus::InvalidInput;
+    }
+
+    uint8_t radix = 0;
+
+    StringView view{input};
+    size_t skipIndex = 0;
+
+    auto status = skipWhitespace(view, skipIndex);
+    if (status != FudStatus::Success) {
+        return status;
+    }
+
+    T sign = 1.0;
+    bool isNegative = false;
+    status = impl::checkNegative(view, isNegative, skipIndex);
+    if (status != FudStatus::Success) {
+        return FudStatus::InvalidInput;
+    }
+
+    if (!isNegative) {
+        status = checkPlusSigned(view, skipIndex);
+    } else {
+        sign = -1.0;
+    }
+
+    if (status != FudStatus::Success) {
+        return FudStatus::InvalidInput;
+    }
+
+    T num = 0;
+    size_t digitIndex = 0;
+
+    auto retSuccess = [&]() {
+        index = skipIndex + digitIndex;
+        number = num;
+        return FudStatus::Success;
+    };
+
+    if (impl::isNanOrInf(num, view, sign, digitIndex)) {
+        return retSuccess();
+    }
+
+    status = impl::getRadix(view, radix, skipIndex);
+    if (status != FudStatus::Success) {
+        return status;
+    }
+
+    bool foundDecimal = false;
+    bool foundExponent = false;
+    status = getWhole(view, digitIndex, num, sign, radix, foundDecimal, foundExponent);
+
+    if (status == FudStatus::Success && foundExponent) {
+        status = getExponent(view, digitIndex, num, radix);
+    }
+
+    if (status != FudStatus::Success) {
+        return status;
+    }
+
+    if (!foundDecimal) {
+        if (digitIndex < 1) {
+            return FudStatus::InvalidInput;
+        }
+
+        return retSuccess();
+    }
+
+    status = getFraction(view, digitIndex, num, sign, radix, foundExponent);
+
+    if (foundExponent) {
+        status = getExponent(view, digitIndex, num, radix);
+        if (status != FudStatus::Success) {
+            return status;
+        }
+    }
+
+    if (digitIndex < 1) {
+        return FudStatus::InvalidInput;
+    }
+
+    if (std::isinf(num) || std::isnan(num)) // isnan is dubious here - likely unreachable
+    {
+        return ExtRangeError;
+    }
+
+    return retSuccess();
+}
+
+template <typename T>
+FudStatus stringViewToFloat(StringView input, T* number, size_t* index)
+{
+    if (anyAreNull(input.data, number)) {
+        return FudStatus::NullPointer;
+    }
+
+    size_t localIndex{0};
+    auto status = stringViewToFloat(input, *number, localIndex);
+
+    if (status == FudStatus::Success && index != nullptr) {
+        *index = localIndex;
+    }
+    return status;
+}
+
+} // namespace impl
+
+FudStatus fud_string_to_float(StringView input, float* number, size_t* index)
+{
+    return impl::stringViewToFloat(input, number, index);
+}
+
+FudStatus fud_string_to_double(StringView input, double* number, size_t* index)
+{
+    return impl::stringViewToFloat(input, number, index);
+}
+
+namespace fud {
+
+FudStatus StringView::toUint8(uint8_t& number, uint8_t specifiedRadix, size_t& strLen) const
+{
+    return ::impl::stringViewToUnsignedInteger(*this, number, specifiedRadix, strLen);
+}
+
+FudStatus StringView::toUint16(uint16_t& number, uint8_t specifiedRadix, size_t& strLen) const
+{
+    return ::impl::stringViewToUnsignedInteger(*this, number, specifiedRadix, strLen);
+}
+
+FudStatus StringView::toUint32(uint32_t& number, uint8_t specifiedRadix, size_t& strLen) const
+{
+    return ::impl::stringViewToUnsignedInteger(*this, number, specifiedRadix, strLen);
+}
+
+FudStatus StringView::toUint64(uint64_t& number, uint8_t specifiedRadix, size_t& strLen) const
+{
+    return ::impl::stringViewToUnsignedInteger(*this, number, specifiedRadix, strLen);
+}
+
+FudStatus StringView::toInt8(int8_t& number, uint8_t specifiedRadix, size_t& strLen) const
+{
+    return ::impl::stringViewToSignedInteger(*this, number, specifiedRadix, strLen);
+}
+
+FudStatus StringView::toInt16(int16_t& number, uint8_t specifiedRadix, size_t& strLen) const
+{
+    return ::impl::stringViewToSignedInteger(*this, number, specifiedRadix, strLen);
+}
+
+FudStatus StringView::toInt32(int32_t& number, uint8_t specifiedRadix, size_t& strLen) const
+{
+    return ::impl::stringViewToSignedInteger(*this, number, specifiedRadix, strLen);
+}
+
+FudStatus StringView::toInt64(int64_t& number, uint8_t specifiedRadix, size_t& strLen) const
+{
+    return ::impl::stringViewToSignedInteger(*this, number, specifiedRadix, strLen);
+}
+
+FudStatus StringView::toFloat(float& number, size_t& strLen) const
+{
+    return ::impl::stringViewToFloat(*this, number, strLen);
+}
+
+FudStatus StringView::toDouble(double& number, size_t& strLen) const
+{
+    return ::impl::stringViewToFloat(*this, number, strLen);
+}
+
+#endif
+
+} // namespace fud