1 files changed, 16 insertions, 0 deletions

diff --git a/src/util/url.c b/src/util/url.c
index 5962a18b2..3fbc4a048 100644
--- a/src/util/url.c
+++ b/src/util/url.c
@@ -365,4 +365,20 @@ TALER_url_absolute_raw (const char *proto,
 }
 
 
+bool
+TALER_url_valid_charset (const char *url)
+{
+  for (unsigned int i = 0; '\0' != url[i]; i++)
+  {
+#define ALLOWED_CHARACTERS \
+  "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789/:&?-.,=_~%"
+    if (NULL == strchr (ALLOWED_CHARACTERS,
+                        (int) url[i]))
+      return false;
+#undef ALLOWED_CHARACTERS
+  }
+  return true;
+}
+
+
 /* end of url.c */