From 44581dbef53ba2ae589cbc8e481285697363941f Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Tue, 29 Oct 2013 21:13:11 +0100
Subject: util/UriUtil: add uri_is_child_or_same()

---
 src/util/UriUtil.cxx | 18 ++++++++++++++++++
 src/util/UriUtil.hxx | 13 +++++++++++++
 2 files changed, 31 insertions(+)

(limited to 'src/util')

diff --git a/src/util/UriUtil.cxx b/src/util/UriUtil.cxx
index d542fc0a9..7997bd5c9 100644
--- a/src/util/UriUtil.cxx
+++ b/src/util/UriUtil.cxx
@@ -106,3 +106,21 @@ uri_remove_auth(const char *uri)
 	result.erase(auth - uri, at + 1 - auth);
 	return result;
 }
+
+bool
+uri_is_child(const char *parent, const char *child)
+{
+	assert(parent != nullptr);
+	assert(child != nullptr);
+
+	const size_t parent_length = strlen(parent);
+	return memcmp(parent, child, parent_length) == 0 &&
+		child[parent_length] == '/';
+}
+
+
+bool
+uri_is_child_or_same(const char *parent, const char *child)
+{
+	return strcmp(parent, child) == 0 || uri_is_child(parent, child);
+}
diff --git a/src/util/UriUtil.hxx b/src/util/UriUtil.hxx
index d93296b10..78d0a6bff 100644
--- a/src/util/UriUtil.hxx
+++ b/src/util/UriUtil.hxx
@@ -57,4 +57,17 @@ gcc_pure
 std::string
 uri_remove_auth(const char *uri);
 
+/**
+ * Check whether #child specifies a resource "inside" the directory
+ * specified by #parent.  If the strings are equal, the function
+ * returns false.
+ */
+gcc_pure gcc_nonnull_all
+bool
+uri_is_child(const char *parent, const char *child);
+
+gcc_pure gcc_nonnull_all
+bool
+uri_is_child_or_same(const char *parent, const char *child);
+
 #endif
-- 
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