1 files changed, 48 insertions, 0 deletions
diff --git a/windows/utils/escape_registry_key.c b/windows/utils/escape_registry_key.c
new file mode 100644
index 00000000..f5c9c19e
--- /dev/null
+++ b/windows/utils/escape_registry_key.c
@@ -0,0 +1,48 @@
+/*
+ * Escaping/unescaping functions to translate between a saved session
+ * name, and the key name used to represent it in the Registry area
+ * where we store saved sessions.
+ *
+ * The basic technique is to %-escape characters we can't use in
+ * Registry keys.
+ */
+
+#include "putty.h"
+
+void escape_registry_key(const char *in, strbuf *out)
+{
+    bool candot = false;
+    static const char hex[16] = "0123456789ABCDEF";
+
+    while (*in) {
+        if (*in == ' ' || *in == '\\' || *in == '*' || *in == '?' ||
+            *in == '%' || *in < ' ' || *in > '~' || (*in == '.'
+                                                     && !candot)) {
+            put_byte(out, '%');
+            put_byte(out, hex[((unsigned char) *in) >> 4]);
+            put_byte(out, hex[((unsigned char) *in) & 15]);
+        } else
+            put_byte(out, *in);
+        in++;
+        candot = true;
+    }
+}
+
+void unescape_registry_key(const char *in, strbuf *out)
+{
+    while (*in) {
+        if (*in == '%' && in[1] && in[2]) {
+            int i, j;
+
+            i = in[1] - '0';
+            i -= (i > 9 ? 7 : 0);
+            j = in[2] - '0';
+            j -= (j > 9 ? 7 : 0);
+
+            put_byte(out, (i << 4) + j);
+            in += 3;
+        } else {
+            put_byte(out, *in++);
+        }
+    }
+}