From 5d73e8928826340aaca9e78205ffb093a6b4f95c Mon Sep 17 00:00:00 2001
From: danieldg <danieldg@e03df62e-2008-0410-955e-edbf42e46eb7>
Date: Sun, 25 Oct 2009 00:02:28 +0000
Subject: Add <config:format> to avoid breaking existing configuration files
 with XML entity changes

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@11974 e03df62e-2008-0410-955e-edbf42e46eb7
---
 conf/inspircd.conf.example |  5 +++++
 conf/modules.conf.example  |  4 +++-
 include/configparser.h     |  5 +++--
 src/configparser.cpp       | 26 ++++++++++++++++++++++++--
 4 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/conf/inspircd.conf.example b/conf/inspircd.conf.example
index d5c9874df..47ecd5889 100644
--- a/conf/inspircd.conf.example
+++ b/conf/inspircd.conf.example
@@ -71,6 +71,10 @@
 # Variables may be redefined and may reference other variables.       #
 # Value expansion happens at the time the tag is read.                #
 #                                                                     #
+# Using variable definitions REQUIRES that the config format be       #
+# changed to "xml" from the default "compat" that uses escape         #
+# sequences such as "\"" and "\n", and does not support <define>      #
+<config format="xml">
 <define name="bindip" value="1.2.2.3">
 <define name="localips" value="&bindip;/24">
 
@@ -478,6 +482,7 @@
          # prefixpart: What (if anything) a users' part message
          # should be prefixed with.
          prefixpart="&quot;"
+         # NOTE: Use "\"" instead of "&quot;" if not using <config format="xml">
 
          # suffixpart: What (if anything) a users' part message
          # should be suffixed with.
diff --git a/conf/modules.conf.example b/conf/modules.conf.example
index e9a306e3f..91e45eb91 100644
--- a/conf/modules.conf.example
+++ b/conf/modules.conf.example
@@ -126,7 +126,9 @@
 #                    "baz qux quz" and $2 will contain "bar". You may #
 #                    also use the special variables: $nick, $ident,   #
 #                    $host and $vhost, and you may separate multiple  #
-#                    commands with a newline (&nl;).                  #
+#                    commands with a newline (which can be written in #
+#                    the file literally, or encoded as &nl; or \n     #
+#                    depending on the config format setting).         #
 #                                                                     #
 # requires    -      If you provide a value for 'requires' this means #
 #                    the given nickname MUST be online for the alias  #
diff --git a/include/configparser.h b/include/configparser.h
index a1d7aff5b..3240ff5f9 100644
--- a/include/configparser.h
+++ b/include/configparser.h
@@ -12,8 +12,9 @@ struct fpos
 
 enum ParseFlags
 {
-	FLAG_NO_EXEC = 1,
-	FLAG_NO_INC = 2
+	FLAG_USE_XML = 1,
+	FLAG_NO_EXEC = 2,
+	FLAG_NO_INC = 4
 };
 
 struct ParseStack
diff --git a/src/configparser.cpp b/src/configparser.cpp
index 1373ae5af..495d38fff 100644
--- a/src/configparser.cpp
+++ b/src/configparser.cpp
@@ -18,7 +18,7 @@
 struct Parser
 {
 	ParseStack& stack;
-	const int flags;
+	int flags;
 	FILE* const file;
 	fpos current;
 	fpos last_tag;
@@ -112,7 +112,7 @@ struct Parser
 		while (1)
 		{
 			ch = next();
-			if (ch == '&')
+			if (ch == '&' && (flags & FLAG_USE_XML))
 			{
 				std::string varname;
 				while (1)
@@ -134,6 +134,16 @@ struct Parser
 					throw CoreException("Undefined XML entity reference '&" + varname + ";'");
 				value.append(var->second);
 			}
+			else if (ch == '\\' && !(flags & FLAG_USE_XML))
+			{
+				int esc = next();
+				if (esc == 'n')
+					value.push_back('\n');
+				else if (isalpha(esc))
+					throw CoreException("Unknown escape character \\" + std::string(1, esc));
+				else
+					value.push_back(esc);
+			}
 			else if (ch == '"')
 				break;
 			else
@@ -169,12 +179,24 @@ struct Parser
 		}
 		else if (name == "define")
 		{
+			if (!(flags & FLAG_USE_XML))
+				throw CoreException("<define> tags may only be used in XML-style config (add <config format=\"xml\">)");
 			std::string varname = tag->getString("name");
 			std::string value = tag->getString("value");
 			if (varname.empty())
 				throw CoreException("Variable definition must include variable name");
 			stack.vars[varname] = value;
 		}
+		else if (name == "config")
+		{
+			std::string format = tag->getString("format");
+			if (format == "xml")
+				flags |= FLAG_USE_XML;
+			else if (format == "compat")
+				flags &= ~FLAG_USE_XML;
+			else if (!format.empty())
+				throw CoreException("Unknown configuration format " + format);
+		}
 		else
 		{
 			stack.output.insert(std::make_pair(name, tag));
-- 
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