Add implementation of NAME->STATUS-CODE.

Tag export of STATUS-CODE as :SYNTAX.

scheme/httpd/response.scm

@@ -78,6 +78,18 @@
   
    (redirect             -301 "Internal redirect")))
 
+(define (name->status-code name)
+  (if (not (symbol? name))
+      (call-error name->status-code (list name))
+      (let loop ((i 0))
+	(cond ((= i (vector-length status-codes))
+	       #f)
+	      ((eq? name
+		    (status-code-name (vector-ref status-codes i)))
+	       (vector-ref status-codes i))
+	      (else
+	       (loop (+ i 1)))))))
+	
 ;;; (make-error-response status-code req [message . extras])
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;; Take an http-error condition, and format it into a response to the client.

scheme/packages.scm

@@ -281,7 +281,8 @@
 	  status-code?
 	  status-code-number
 	  status-code-message
-	  status-code
+	  (status-code :syntax)
+	  name->status-code
 
 	  make-error-response
 	  make-redirect-response
@@ -618,6 +619,7 @@
 	define-record-types
 	finite-types
 	formats
+	(subset signals (call-error))
 	httpd-requests
 	httpd-read-options)
   (files (httpd response)))