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Tail call slowpath

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This commit is contained in:
Jöran Malek 2023-11-29 23:20:20 +01:00
parent 4c7671b396
commit 27e77ed39a
1 changed files with 7 additions and 2 deletions
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9
src/pdns-dhcp/Kea/KeaDhcpLease.cs
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@ -1,6 +1,7 @@
using System.Buffers; using System.Buffers;
using System.Globalization; using System.Globalization;
using DotNext;
using DotNext.Buffers; using DotNext.Buffers;
namespace pdns_dhcp.Kea; namespace pdns_dhcp.Kea;
@ -9,10 +10,14 @@ public static class KeaDhcpLease
{ {
private static ReadOnlySpan<char> EscapeTag => ['&', '#', 'x']; private static ReadOnlySpan<char> EscapeTag => ['&', '#', 'x'];
// ref: https://github.com/isc-projects/kea/blob/Kea-2.5.3/src/lib/util/csv_file.cc#L479
public static string Unescape(in ReadOnlySpan<char> text) public static string Unescape(in ReadOnlySpan<char> text)
{ {
int esc_pos = text.IndexOf(EscapeTag); return text.IndexOf(EscapeTag) switch
return esc_pos == -1 ? text.ToString() : SlowPath(esc_pos, text); {
-1 => text.ToString(),
int i => SlowPath(i, text)
};
static string SlowPath(int esc_pos, in ReadOnlySpan<char> text) static string SlowPath(int esc_pos, in ReadOnlySpan<char> text)
{ {