From 030e0af985c2d370a2f0274e9911b22b479c2439 Mon Sep 17 00:00:00 2001
From: Marian Buschsieweke <marian.buschsieweke@ovgu.de>
Date: Fri, 14 Aug 2020 10:09:33 +0200
Subject: [PATCH] sys/unaligned: Add 64 bit version

Add helper function to access `uint64_t` values with possibly unaligned
pointers.
---
 sys/include/unaligned.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/sys/include/unaligned.h b/sys/include/unaligned.h
index ced46ac328..1ea3bce83f 100644
--- a/sys/include/unaligned.h
+++ b/sys/include/unaligned.h
@@ -53,6 +53,11 @@ typedef struct __attribute__((packed)) {
     uint32_t val;       /**< value */
 } uint32_una_t;
 
+/** @brief Unaligned access helper struct (uint64_t version) */
+typedef struct __attribute__((packed)) {
+    uint64_t val;       /**< value */
+} uint64_una_t;
+
 /**
  * @brief    Get uint16_t from possibly unaligned pointer
  *
@@ -79,6 +84,19 @@ static inline uint32_t unaligned_get_u32(const void *ptr)
     return tmp->val;
 }
 
+/**
+ * @brief    Get uint64_t from possibly unaligned pointer
+ *
+ * @param[in]   ptr pointer to read from
+ *
+ * @returns value read from @p ptr
+ */
+static inline uint64_t unaligned_get_u64(const void *ptr)
+{
+    const uint64_una_t *tmp = (const uint64_una_t *)ptr;
+    return tmp->val;
+}
+
 #ifdef __cplusplus
 }
 #endif