2 files changed, 13 insertions, 5 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 9ece2f9ec..0ea7700f2 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -37,8 +37,6 @@
 #include <termios.h>
 #include <time.h>
 #include <unistd.h>
-/* Try to pull in PATH_MAX */
-#include <limits.h>
 #include <sys/param.h>
 #ifdef HAVE_MNTENT_H
 # include <mntent.h>
@@ -265,6 +263,11 @@ extern int *const bb_errno;
 #define errno (*bb_errno)
 #endif
 
+#if !(ULONG_MAX > 0xffffffff)
+/* Only 32-bit CPUs need this, 64-bit ones use inlined version */
+uint64_t bb_bswap_64(uint64_t x) FAST_FUNC;
+#endif
+
 unsigned long long monotonic_ns(void) FAST_FUNC;
 unsigned long long monotonic_us(void) FAST_FUNC;
 unsigned long long monotonic_ms(void) FAST_FUNC;
@@ -1557,7 +1560,7 @@ typedef struct md5_ctx_t {
         uint32_t C;
         uint32_t D;
         uint64_t total64;
-        char wbuffer[64];
+        char wbuffer[64]; /* NB: always correctly aligned for uint64_t */
 } md5_ctx_t;
 #else
 /* libbb/md5prime.c uses a bit different one: */
diff --git a/include/platform.h b/include/platform.h
index ed8c137e1..c20d2aef6 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -160,6 +160,7 @@
 
 /* ---- Endian Detection ------------------------------------ */
 
+#include <limits.h>
 #if defined(__digital__) && defined(__unix__)
 # include <sex.h>
 #elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
@@ -207,6 +208,10 @@
 # error "Can't determine endianness"
 #endif
 
+#if ULONG_MAX > 0xffffffff
+# define bb_bswap_64(x) bswap_64(x)
+#endif
+
 /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
 #if BB_BIG_ENDIAN
 # define SWAP_BE16(x) (x)
@@ -214,13 +219,13 @@
 # define SWAP_BE64(x) (x)
 # define SWAP_LE16(x) bswap_16(x)
 # define SWAP_LE32(x) bswap_32(x)
-# define SWAP_LE64(x) bswap_64(x)
+# define SWAP_LE64(x) bb_bswap_64(x)
 # define IF_BIG_ENDIAN(...) __VA_ARGS__
 # define IF_LITTLE_ENDIAN(...)
 #else
 # define SWAP_BE16(x) bswap_16(x)
 # define SWAP_BE32(x) bswap_32(x)
-# define SWAP_BE64(x) bswap_64(x)
+# define SWAP_BE64(x) bb_bswap_64(x)
 # define SWAP_LE16(x) (x)
 # define SWAP_LE32(x) (x)
 # define SWAP_LE64(x) (x)