From 8f41cc827b3c4096da4cd770175f43a085231bbf Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sat, 3 Jul 2021 17:11:39 +0200
Subject: Case insensitive tag and attribute key match

---
 README.md        |  3 ++-
 src/HtmlSearch.c | 24 +++++++++++++++++++-----
 2 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/README.md b/README.md
index 0516066..b7f6ea6 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,5 @@
 Html search using non-standard xpath, written in C. See tests/main.c
 
 # Note
-This library does not decode html sequences in text and attribute values
\ No newline at end of file
+This library does not decode html sequences in text and attribute values.
+Tag and attribute key matching is case-insensitive.
\ No newline at end of file
diff --git a/src/HtmlSearch.c b/src/HtmlSearch.c
index 267ec6a..bc58881 100644
--- a/src/HtmlSearch.c
+++ b/src/HtmlSearch.c
@@ -118,16 +118,30 @@ static int str_glob_match(const QuickMediaStringView str, const QuickMediaString
     return 1;
 }
 
-static int string_views_equal(const QuickMediaStringView str1, const QuickMediaStringView str2) {
-    if(str2.size == str1.size && memcmp(str2.data, str1.data, str1.size) == 0)
-        return 0;
+static char to_upper(char c) {
+    if(c >= 'a' && c <= 'z')
+        return c - 32;
     else
+        return c;
+}
+
+static int string_views_equal_case_insensitive(const QuickMediaStringView str1, const QuickMediaStringView str2) {
+    if(str2.size != str1.size)
         return 1;
+
+    for(size_t i = 0; i < str1.size; ++i) {
+        char c1 = str1.data[i];
+        char c2 = str2.data[i];
+        if(to_upper(c1) != to_upper(c2))
+            return 1;
+    }
+
+    return 0;
 }
 
 static QuickMediaHtmlAttribute* get_attribute_by_name(QuickMediaHtmlNode *node, QuickMediaStringView name) {
     for(QuickMediaHtmlAttribute *attr = node->first_attribute; attr; attr = attr->next) {
-        if(string_views_equal(attr->key, name) == 0)
+        if(string_views_equal_case_insensitive(attr->key, name) == 0)
             return attr;
     }
     return NULL;
@@ -144,7 +158,7 @@ static int find_child_nodes(QuickMediaHtmlChildNode *node, const QuickMediaNodeS
             continue;
 
         /* Match without node name or node name matches */
-        if(search_data->name.size == 0 || string_views_equal(child->node.name, search_data->name) == 0) {
+        if(search_data->name.size == 0 || string_views_equal_case_insensitive(child->node.name, search_data->name) == 0) {
             #define on_match() do { \
                 if(search_data->child) { \
                     if(find_child_nodes(child->node.first_child, search_data->child, result_callback, userdata) != 0) \
-- 
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