From 050af956667b234d4e2e594a44371cde541baf95 Mon Sep 17 00:00:00 2001
From: chrysn <chrysn@fsfe.org>
Date: Fri, 3 Apr 2020 15:22:13 +0200
Subject: [PATCH] uri_parser: Fix relative recognition

Relative refernces with colons in their names can not be told by their
first character alone.
---
 sys/uri_parser/uri_parser.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sys/uri_parser/uri_parser.c b/sys/uri_parser/uri_parser.c
index 228bc6d058..0a3c6ef43e 100644
--- a/sys/uri_parser/uri_parser.c
+++ b/sys/uri_parser/uri_parser.c
@@ -218,6 +218,17 @@ bool uri_parser_is_absolute(const char *uri, size_t uri_len)
             /* relative */
             return false;
         }
+        for (int i = 0; &uri[i] < colon; ++i) {
+            if (!(((uri[i] >= 'A') && (uri[i] <= 'Z')) ||
+                  ((uri[i] >= 'a') && (uri[i] <= 'z')) ||
+                  ((uri[i] >= '0') && (uri[i] <= '9')) ||
+                  (uri[i] == '+') ||
+                  (uri[i] == '-') ||
+                  (uri[i] == '.'))) {
+                /* relative */
+                return false;
+            }
+        }
 
         /* absolute */
         return true;