Use case-insensitive strstr to match "stylesheet"

svn path=/trunk/netsurf/; revision=2689

3 files changed, 24 insertions, 2 deletions

diff --git a/render/html.c b/render/html.c
index f04b23c37..f4d6f4fca 100644
--- a/render/html.c
+++ b/render/html.c
@@ -593,10 +593,10 @@ bool html_find_stylesheets(struct content *c, xmlNode *head)
 			/* rel=<space separated list, including 'stylesheet'> */
 			if ((rel = (char *) xmlGetProp(node, (const xmlChar *) "rel")) == NULL)
 				continue;
-			if (strstr(rel, "stylesheet") == 0) {
+			if (strcasestr(rel, "stylesheet") == 0) {
 				xmlFree(rel);
 				continue;
-			} else if (strstr(rel, "alternate")) {
+			} else if (strcasestr(rel, "alternate")) {
 				/* Ignore alternate stylesheets */
 				xmlFree(rel);
 				continue;
diff --git a/utils/utils.c b/utils/utils.c
index 1db7f18b9..fca35ab21 100644
--- a/utils/utils.c
+++ b/utils/utils.c
@@ -214,3 +214,24 @@ const char *rfc1123_date(time_t t)
 
 	return ret;
 }
+
+/**
+ * Case insensitive strstr implementation
+ *
+ * \param haystack String to search in
+ * \param needle String to look for
+ * \return Pointer to start of found substring, or NULL if not found
+ */
+char *strcasestr(const char *haystack, const char *needle)
+{
+	size_t needle_len = strlen(needle);
+	const char * last_start = haystack + (strlen(haystack) - needle_len);
+
+	while (haystack <= last_start) {
+		if (strncasecmp(haystack, needle, needle_len) == 0)
+			return (char *)haystack;
+		haystack++;
+	}
+
+	return NULL;
+}
diff --git a/utils/utils.h b/utils/utils.h
index b7b9e629f..559cc6db0 100644
--- a/utils/utils.h
+++ b/utils/utils.h
@@ -56,6 +56,7 @@ void regcomp_wrapper(regex_t *preg, const char *regex, int cflags);
 void unicode_transliterate(unsigned int c, char **r);
 char *human_friendly_bytesize(unsigned long bytesize);
 const char *rfc1123_date(time_t t);
+char *strcasestr(const char *haystack, const char *needle);
 
 /* Platform specific functions */
 void die(const char * const error);