1 files changed, 64 insertions, 0 deletions
diff --git a/source/fud_format.cpp b/source/fud_format.cpp
index 6bd5aae..f3e6894 100644
--- a/source/fud_format.cpp
+++ b/source/fud_format.cpp
@@ -507,6 +507,70 @@ FudStatus getFormatSign(StringView& formatView, FormatSpec& spec)
     return FudStatus::Success;
 }
 
+size_t findSpec(StringView scanView)
+{
+    size_t index = 0;
+    bool foundBracket = false;
+    while (index < scanView.length()) {
+        auto letter = scanView[index];
+        if (letter == FormatSpec::openBracket && not foundBracket) {
+            foundBracket = true;
+        } else if (letter == FormatSpec::openBracket && foundBracket) {
+            foundBracket = false;
+        } else if (foundBracket) {
+            index--;
+            break;
+        }
+        index++;
+    }
+
+    return index;
+}
+
+FudStatus fillUnsignedBuffer(
+    Array<utf8, maxIntCharCount>& buffer,
+    uint64_t value,
+    uint8_t& bufferLength,
+    Radix radix,
+    bool uppercase)
+{
+    static_assert(maxIntCharCount < std::numeric_limits<uint8_t>::max());
+    bufferLength = 0;
+
+    constexpr Array<uint8_t, static_cast<size_t>(Radix::Hexadecimal)> lower{
+        {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}};
+    constexpr Array<uint8_t, static_cast<size_t>(Radix::Hexadecimal)> upper{
+        {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'}};
+    const auto& lookup = uppercase ? upper : lower;
+
+    if (value == 0) {
+        buffer[0] = '0';
+        bufferLength = 1;
+        return FudStatus::Success;
+    }
+
+    static_assert(std::is_same_v<std::underlying_type_t<Radix>, uint8_t>);
+    auto radixValue = static_cast<uint8_t>(radix);
+    while (value > 0 && bufferLength < maxIntCharCount) {
+        auto digit = static_cast<uint8_t>(value % radixValue);
+        buffer[bufferLength] = lookup[digit];
+        value /= radixValue;
+        bufferLength++;
+    }
+
+    if (value > 0 || bufferLength > maxIntCharCount) {
+        return FudStatus::Failure;
+    }
+
+    // TODO: implement fud_algorithm reverse
+    for (size_t idx = 0; idx < bufferLength / 2; ++idx) {
+        auto rhsIndex = bufferLength - idx - 1;
+        std::swap(buffer[idx], buffer[rhsIndex]);
+    }
+
+    return FudStatus::Success;
+}
+
 } // namespace impl
 
 } // namespace fud