From f8be4baf5a2318363b42f8883f66ed8a976dfc79 Mon Sep 17 00:00:00 2001
From: John Denker <jsd@av8n.com>
Date: Sun, 29 Jul 2012 23:26:28 -0700
Subject: scan40 appears to be working, much cleaner than last week's version

---
 tools/utils.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'tools/utils.c')

diff --git a/tools/utils.c b/tools/utils.c
index aecbfda..c544f20 100644
--- a/tools/utils.c
+++ b/tools/utils.c
@@ -3,6 +3,7 @@
 #include <iomanip>
 //#include <stdlib.h>     /* for abs() */
 #include <cmath>
+#include <ctype.h>      /* for isalnum() */
 
 // strip off the directory part of a path, leaving just
 // the basic filename
@@ -58,3 +59,18 @@ std::string ltrim(const std::string foo){
   if (where == foo.npos) return foo;
   return foo.substr(where);
 }
+
+static const std::string Pure_Enough("+-_.,@%~");
+
+std::string purify(const std::string arg){
+  using namespace std;
+  string rslt(arg);
+  for (string::iterator ptr = rslt.begin();
+        ptr != rslt.end(); ptr++){
+    char ch = *ptr;
+    if (isalnum(ch)) continue;
+    if (Pure_Enough.find(ch) != string::npos) continue;
+    *ptr = '~';
+  }
+  return rslt;
+}
-- 
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