Android/ARM portability

2-byte alignment isn't good enough for subpages

diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c
index 5ef3022..32f50fe 100644 (file)
--- a/libraries/libmdb/mdb.c
+++ b/libraries/libmdb/mdb.c
@@ -74,6 +74,10 @@
 #define BIG_ENDIAN     __BIG_ENDIAN
 #endif
 
+#if defined(__i386) || defined(__x86_64)
+#define MISALIGNED_OK  1
+#endif
+
 #include "mdb.h"
 #include "midl.h"
 
@@ -122,6 +126,9 @@
 #define UNLOCK_MUTEX_W(env)    sem_post((env)->me_wmutex)
 #define fdatasync(fd)  fsync(fd)
 #else
+#ifdef ANDROID
+#define fdatasync(fd)  fsync(fd)
+#endif
        /** Lock the reader mutex.
         */
 #define LOCK_MUTEX_R(env)      pthread_mutex_lock(&(env)->me_txns->mti_mutex)
@@ -3996,7 +4003,18 @@ more:
                                fp = NODEDATA(leaf);
                                if (flags == MDB_CURRENT) {
                                        fp->mp_flags |= P_DIRTY;
+#ifdef MISALIGNED_OK
                                        fp->mp_pgno = mc->mc_pg[mc->mc_top]->mp_pgno;
+#else
+                                       {
+                                               unsigned short *src, *dst;
+                                               int i;
+                                               dst = (unsigned short *)&fp->mp_pgno;
+                                               src = (unsigned short *)&mc->mc_pg[mc->mc_top]->mp_pgno;
+                                               for (i=0; i<sizeof(fp->mp_pgno)/sizeof(unsigned short); i++)
+                                                       *dst++ = *src++;
+                                       }
+#endif
                                        mc->mc_xcursor->mx_cursor.mc_pg[0] = fp;
                                        flags |= F_DUPDATA;
                                        goto put_sub;
@@ -4603,7 +4621,18 @@ mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node)
                mx->mx_db.md_leaf_pages = 1;
                mx->mx_db.md_overflow_pages = 0;
                mx->mx_db.md_entries = NUMKEYS(fp);
+#ifdef MISALIGNED_OK
                mx->mx_db.md_root = fp->mp_pgno;
+#else
+               {
+                       unsigned short *src, *dst;
+                       int i;
+                       dst = (unsigned short *)&mx->mx_db.md_root;
+                       src = (unsigned short *)&fp->mp_pgno;
+                       for (i=0; i<sizeof(fp->mp_pgno)/sizeof(unsigned short); i++)
+                               *dst++ = *src++;
+               }
+#endif
                mx->mx_cursor.mc_snum = 1;
                mx->mx_cursor.mc_flags = C_INITIALIZED|C_SUB;
                mx->mx_cursor.mc_top = 0;