* implement strstr
* clean up usb_arcotg_dcd_enable
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14740 a1c6a512-1295-4272-9138-f99709370657
diff --git a/firmware/common/strstr.c b/firmware/common/strstr.c
new file mode 100644
index 0000000..2f33629
--- /dev/null
+++ b/firmware/common/strstr.c
@@ -0,0 +1,45 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id: $
+ *
+ * Copyright (C) 2007 by Christian Gmeiner
+ *
+ ****************************************************************************/
+
+#include <string.h>
+
+/**
+ * Locate substring.
+ * @param search c string to be scanned.
+ * @param find c string containing the sequence of characters to match.
+ * @return a pointer to the first occurrence in search of any of the
+ * entire sequence of characters specified in find, or a
+ * null pointer if the sequence is not present in search.
+ */
+char *strstr(const char *search, const char *find)
+{
+ char *hend;
+ char *a, *b;
+
+ if (*find == 0) return (char*)search;
+ hend = (char *)search + strlen(search) - strlen(find) + 1;
+ while (search < hend) {
+ if (*search == *find) {
+ a = (char *)search;
+ b = (char *)find;
+ for (;;) {
+ if (*b == 0) return (char*)search;
+ if (*a++ != *b++) {
+ break;
+ }
+ }
+ }
+ search++;
+ }
+ return 0;
+}