adding zephyr-im master branch

lib/ZReadZcode.c

@@ -0,0 +1,48 @@
+/* This file is part of the Project Athena Zephyr Notification System.
+ * It contains source for the ZReadZcode function.
+ *
+ *	Created by:	Jeffrey Hutzelman
+ *
+ *	$Id$
+ *
+ *	Copyright (c) 1987, 1990, 2002 by the Massachusetts Institute of Technology.
+ *	For copying and distribution information, see the file
+ *	"mit-copyright.h". 
+ */
+
+#ifndef lint
+static const char rcsid_ZReadZcode_c[] = "$Id$";
+#endif /* lint */
+
+#include <internal.h>
+#include <assert.h>
+
+
+Code_t
+ZReadZcode(unsigned char *ptr,
+	   unsigned char *field,
+	   int max,
+	   int *len)
+{
+    int n = 0;
+
+    if (*ptr++ != 'Z')
+        return ZERR_BADFIELD;
+
+    while (*ptr && n < max) {
+        if (*ptr == 0xff) {
+            ptr++;
+            switch (*ptr++) {
+                case 0xf0: field[n++] = 0x00; continue;
+                case 0xf1: field[n++] = 0xff; continue;
+                default:   return ZERR_BADFIELD;
+            }
+        } else {
+            field[n++] = *ptr++;
+        }
+    }
+    if (*ptr)
+        return (ZERR_BADFIELD);
+    *len = n;
+    return (ZERR_NONE);
+}