From 7eff71b9a365df1074035210ee3a35ae6def6c03 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Sat, 3 Mar 2018 02:34:42 -0800
Subject: [PATCH] ircd::m: Add function to check if and only if id is a valid
 localpart.

---
 include/ircd/m/id.h |  1 +
 ircd/m/id.cc        | 22 ++++++++++++++++++++--
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/include/ircd/m/id.h b/include/ircd/m/id.h
index 9e5ca661f..91f2f3bf4 100644
--- a/include/ircd/m/id.h
+++ b/include/ircd/m/id.h
@@ -207,6 +207,7 @@ namespace ircd::m
 	// Checks
 	bool valid(const id::sigil &, const string_view &) noexcept;
 	bool valid_local(const id::sigil &, const string_view &);  // Local part is valid
+	bool valid_local_only(const id::sigil &, const string_view &) noexcept;  // No :host
 	void validate(const id::sigil &, const string_view &);    // valid() | throws
 }
 
diff --git a/ircd/m/id.cc b/ircd/m/id.cc
index 00ce9cf4f..3b4ea0a75 100644
--- a/ircd/m/id.cc
+++ b/ircd/m/id.cc
@@ -30,6 +30,7 @@ namespace ircd::m
 	using qi::raw;
 	using qi::attr;
 	using qi::eps;
+	using qi::eoi;
 	using qi::attr_cast;
 
 	using karma::lit;
@@ -546,6 +547,24 @@ catch(...)
 	return false;
 }
 
+bool
+ircd::m::valid_local_only(const id::sigil &sigil,
+                          const string_view &id)
+noexcept try
+{
+	static const auto test
+	{
+		&lit(char(sigil)) > &m::id::parser.prefix > &eoi
+	};
+
+	const char *start{begin(id)};
+	return qi::parse(start, end(id), test);
+}
+catch(...)
+{
+	return false;
+}
+
 bool
 ircd::m::valid_local(const id::sigil &sigil,
                      const string_view &id)
@@ -556,8 +575,7 @@ ircd::m::valid_local(const id::sigil &sigil,
 	};
 
 	const char *start{id.data()};
-	const char *const stop{id.data() + id.size()};
-	return qi::parse(start, stop, test);
+	return qi::parse(start, end(id), test);
 }
 
 bool