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Use uint.TryFormat to fix TODO in IPAddressParser #117300

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Merged
stephentoub merged 1 commit into from
Jul 23, 2025
Merged

Use uint.TryFormat to fix TODO in IPAddressParser #117300

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20 changes: 8 additions & 12 deletions src/libraries/System.Net.Primitives/src/System/Net/IPAddressParser.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -194,6 +194,7 @@ static int FormatByte(uint number, Span<TChar> addressString)
internal static int FormatIPv6Address<TChar>(ushort[] address, uint scopeId, Span<TChar> destination)
where TChar : unmanaged, IBinaryInteger<TChar>
{
Debug.Assert(typeof(TChar) == typeof(byte) || typeof(TChar) == typeof(char));
int pos = 0;

if (IPv6AddressHelper.ShouldHaveIpv4Embedded(address))
Expand All @@ -220,18 +221,13 @@ internal static int FormatIPv6Address<TChar>(ushort[] address, uint scopeId, Spa
{
destination[pos++] = TChar.CreateTruncating('%');

// TODO https://github.com/dotnet/runtime/issues/84527: Use UInt32 TryFormat for both char and byte once IUtf8SpanFormattable implementation exists
Span<TChar> chars = stackalloc TChar[10];
int bytesPos = 10;
do
{
(scopeId, uint digit) = Math.DivRem(scopeId, 10);
chars[--bytesPos] = TChar.CreateTruncating('0' + digit);
}
while (scopeId != 0);
Span<TChar> used = chars.Slice(bytesPos);
used.CopyTo(destination.Slice(pos));
pos += used.Length;
int bytesWritten;
bool formatted = typeof(TChar) == typeof(byte) ?
scopeId.TryFormat(MemoryMarshal.Cast<TChar, byte>(destination).Slice(pos), out bytesWritten) :
scopeId.TryFormat(MemoryMarshal.Cast<TChar, char>(destination).Slice(pos), out bytesWritten);

Debug.Assert(formatted);
pos += bytesWritten;
}

return pos;
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