1 files changed, 38 insertions, 0 deletions

diff --git a/firmware/libc/strstr.c b/firmware/libc/strstr.c
new file mode 100644
index 0000000000..73fab1cc63
--- /dev/null
+++ b/firmware/libc/strstr.c
@@ -0,0 +1,38 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id: $
+ *
+ * Copyright (C) 1991, 1992  Linus Torvalds
+ * (from linux/lib/string.c)
+ *
+ ****************************************************************************/
+
+#include <string.h>
+
+/**
+ * strstr - Find the first substring in a %NUL terminated string
+ * @s1: The string to be searched
+ * @s2: The string to search for
+ */
+char *strstr(const char *s1, const char *s2)
+{
+    int l1, l2;
+
+    l2 = strlen(s2);
+    if (!l2)
+        return (char *)s1;
+    l1 = strlen(s1);
+    while (l1 >= l2) {
+        l1--;
+        if (!memcmp(s1, s2, l2))
+            return (char *)s1;
+        s1++;
+    }
+    return NULL;
+}
+