From 627ed4a556b987aba5452199ec6f7931dec944fe Mon Sep 17 00:00:00 2001
From: Karl Ramm <kcr@mit.edu>
Date: Tue, 25 Dec 2007 05:37:11 +0000
Subject: these should have been added when the branch was merged.  *sigh*

---
 lib/ZMakeZcode.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 lib/ZMakeZcode.c

(limited to 'lib/ZMakeZcode.c')

diff --git a/lib/ZMakeZcode.c b/lib/ZMakeZcode.c
new file mode 100644
index 0000000..6229bef
--- /dev/null
+++ b/lib/ZMakeZcode.c
@@ -0,0 +1,80 @@
+/* This file is part of the Project Athena Zephyr Notification System.
+ * It contains source for the ZMakeZcode function.
+ *
+ *	Created by:	Jeffrey Hutzelman
+ *
+ *	$Id$
+ *
+ *	Copyright (c) 1987, 2002 by the Massachusetts Institute of Technology.
+ *	For copying and distribution information, see the file
+ *	"mit-copyright.h". 
+ */
+
+#include <internal.h>
+#include <assert.h>
+
+#ifndef lint
+static const char rcsid_ZMakeZcode_c[] = "$Id$";
+#endif
+
+Code_t ZMakeZcode32(ptr, len, val)
+    char *ptr;
+    int len;
+    unsigned long val;
+{
+    unsigned char buf[4];
+    buf[0] = (val >> 24) & 0xff;
+    buf[1] = (val >> 16) & 0xff;
+    buf[2] = (val >>  8) & 0xff;
+    buf[3] =  val        & 0xff;
+    return ZMakeZcode(ptr, len, buf, 4);
+}
+
+Code_t ZMakeZcode(ptr, len, field, num)
+    register char *ptr;
+    int len;
+    unsigned char *field;
+    int num;
+{
+    int i;
+
+    /*
+     * This optimistic check lets us discover quickly if the buffer
+     * is not even large enough to hold the field without escapes.
+     * It also insures we'll have space for the leading 'Z' and the
+     * trailing NUL.  Note that this does _not_ remove the need for
+     * checking length as we encode.
+     */
+    if (len < num + 2)
+      return ZERR_FIELDLEN;
+    *ptr++ = 'Z';
+    --len;
+    for (i=0;i<num;i++) {
+        switch (field[i]) {
+            case 0x00:
+                if (len < 3)
+                    return ZERR_FIELDLEN;
+                *ptr++ = 0xff;
+                *ptr++ = 0xf0;
+                len -= 2;
+                continue;
+
+            case 0xff:
+                if (len < 3)
+                    return ZERR_FIELDLEN;
+                *ptr++ = 0xff;
+                *ptr++ = 0xf1;
+                len -= 2;
+                continue;
+
+            default:
+                if (len < 2)
+                    return ZERR_FIELDLEN;
+                *ptr++ = field[i];
+                len--;
+        }
+    }
+
+    *ptr = '\0';
+    return ZERR_NONE;
+}
-- 
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