touch up cgi.lua

cgi/cgi.lua

@@ -3,7 +3,28 @@
 local cgi = {}
 
 cgi.POST_MAX = 512
-local getc = {}
+
+local CL = tonumber(os.getenv("CONTENT_LENGTH")) or 0
+function getc_post()
+	if (CL > 0) then
+		CL = CL - 1
+		return io.read(1)
+	else
+		return nil
+	end
+end
+
+local query = os.getenv("QUERY_STRING") or ""
+local query_len = query:len()
+local query_pos = 0
+function getc_get()
+	if (query_pos < query_len) then
+		query_pos = query_pos + 1
+		return string.sub(query, query_pos, query_pos)
+	else
+		return nil
+	end
+end
 
 function cgi.http_error(code, name, info)
 	print(code .. " " .. name)
@@ -22,19 +43,11 @@ function cgi.init()
 			cgi.http_error(415, "Unsupported content-type", "You are sending me data in a format I can't process")
 		end
 		
-		local CL = tonumber(os.getenv("CONTENT_LENGTH")) or 0
 		if (CL > cgi.POST_MAX) then
 			cgi.http_error(413, "Post Data Too Long", "You are sending me more data than I'm prepared to handle")
 		end
 		
-		function getc()
-			if (CL > 0) then
-				CL = CL - 1
-				return io.read(1)
-			else
-				return nil
-			end
-		end
+		getc = getc_post
 	elseif (method == "GET") then
 		local query = os.getenv("QUERY_STRING") or ""
 		local query_pos = 0
@@ -43,14 +56,7 @@ function cgi.init()
 			cgi.http_error(413, "Query Data Too Long", "You are sending me more data than I'm prepared to handle")
 		end
 		
-		function getc()
-			if (query_pos < query_len) then
-				query_pos = query_pos + 1
-				return string.sub(query, query_pos, query_pos)
-			else
-				return nil
-			end
-		end
+		getc = getc_get
 	else
 		cgi.http_error(405, "Method not allowed", "I only do GET and POST.")
 	end
@@ -79,6 +85,20 @@ function cgi.item()
 	end
 end
 
+function cgi.fields()
+	local ret = {}
+	
+	while (true) do
+		local k = cgi.item()
+		local v = cgi.item()
+		
+		if (k == "") then
+			return ret
+		end
+		ret[k] = v
+	end
+end
+
 function cgi.escape(s)
 	s = string.gsub(s, "&", "&amp;")
 	s = string.gsub(s, "<", "&lt;")
@@ -87,4 +107,3 @@ function cgi.escape(s)
 end
 
 return cgi
-

cgi/puzzler.cgi

@@ -3,4 +3,9 @@
 local cgi = require "cgi"
 
 cgi.init()
-print(cgi.item())
+fields = cgi.fields()
+print("Content-type: text/html")
+print()
+print("<pre>")
+print(fields["t"])
+print("</pre>")