+#if !_STRING_ARCH_unaligned
+/* To check alignment gcc has an appropriate operator. Other
+ compilers don't. */
+# if __GNUC__ >= 2
+# define UNALIGNED_P(p) (((uintptr_t) p) % __alignof__ (uint32_t) != 0)
+# else
+# define alignof(type) offsetof (struct { char c; type x; }, x)
+# define UNALIGNED_P(p) (((size_t) p) % alignof (uint32_t) != 0)
+# endif
+ if (UNALIGNED_P (buffer))
+ while (len > 64)
+ {
+ md5_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx);
+ buffer = (const char *) buffer + 64;
+ len -= 64;
+ }
+ else
+#endif
+ {
+ md5_process_block (buffer, len & ~63, ctx);
+ buffer = (const char *) buffer + (len & ~63);
+ len &= 63;
+ }