Fixes to os_unix.c to support database (and other) files larger than 2GiB on Android.

FossilOrigin-Name: ad7063aa1a0db32cdbe71815545b2edca57d3bcc

diff --cc manifest
index bfce404357668de1b9173b714fcd82743a3810c5,9df6c3ab5dcbe9b7a3ca389761752eef1607ad01..ccd849754b93f376f5f665fa940c84dc5fbadd33
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Fix\stypos\sin\scomments.\sNo\scode\schanges.
- D 2014-09-06T16:39:46.963
 -C Merge\slatest\strunk\schanges\swith\sthis\sbranch.
 -D 2014-09-06T16:52:18.556
++C Fixes\sto\sos_unix.c\sto\ssupport\sdatabase\s(and\sother)\sfiles\slarger\sthan\s2GiB\son\sAndroid.
++D 2014-09-06T17:06:13.410
  F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
  F Makefile.in cf57f673d77606ab0f2d9627ca52a9ba1464146a
  F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@@ -208,7 -208,7 +208,7 @@@ F src/os.c 1b147e4cf7cc39e618115c14a086
  F src/os.h 3e57a24e2794a94d3cf2342c6d9a884888cd96bf
  F src/os_common.h 92815ed65f805560b66166e3583470ff94478f04
  F src/os_setup.h c9d4553b5aaa6f73391448b265b89bed0b890faa
- F src/os_unix.c 576f95b5b02397044ebbcdc1027528ba1bb2d92e
 -F src/os_unix.c 074879d7378638e12d4e4345cfc2f01c00a41c09
++F src/os_unix.c addd023b26c623fec4dedc110fc4370a65b4768c
  F src/os_win.c 0a4042ef35f322e86fa01f6c8884c5e645b911e7
  F src/os_win.h 09e751b20bbc107ffbd46e13555dc73576d88e21
  F src/pager.c 31da9594ad4c3b5851bb6fe1a95c33835ab7ddce
@@@ -1193,7 -1193,7 +1193,7 @@@ F tool/vdbe_profile.tcl 67746953071a9f8
  F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
  F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
  F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
- P 4d4fb197dc438a486cf5d967cf435f1132902c63
- R db0dce11ff1f08f3ef74aeb9c5ce2829
- U peter.d.reid
- Z 050bcae7bdbaf9a55cc282a84c1e1741
 -P e7fae33c0754488336ce093189a83dfe1b818d89 e62aab5e9290503869e1f4d5e0fefd2b4dee0a69
 -R 4f1c4fbf36518adadafff47a2a4e4d9c
++P e62aab5e9290503869e1f4d5e0fefd2b4dee0a69 9dca7ce55797b3eb617859f6189c1a2ec6f66566
++R 4eacabb789e62917f709201f03eadd53
+ U dan
 -Z f9c1e86e1e1c4d77fdb86b6f664302fc
++Z f60ed4f30cad7188918c7dd18fc1b985

diff --cc manifest.uuid
index 3f8f17bbced8e613d08572304451cc5e48c94000,b1d8cba871503e682b9a031dbed696d44932abe9..fc5888a5d9b2d382136a6cd4e42580c874eaa07c
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- e62aab5e9290503869e1f4d5e0fefd2b4dee0a69
 -9dca7ce55797b3eb617859f6189c1a2ec6f66566
++ad7063aa1a0db32cdbe71815545b2edca57d3bcc

diff --cc src/os_unix.c
index c4f1d40d44e83458a6f172c0ec37274d0c14f74c,eb05fc860fa2eaa5d8cd541896a6cff51a5cef5e..5e820260a46f3ca8aadf5c9824a36b9bd28ebe62
--- 1/src/os_unix.c
--- 2/src/os_unix.c
+++ b/src/os_unix.c
@@@ -711,6 -723,15 +723,15 @@@ static int lockTrace(int fd, int op, st
  */
  static int robust_ftruncate(int h, sqlite3_int64 sz){
    int rc;
 -  ** truncate a file to any size smaller than 2GiB. Silently ignore any
+ #ifdef __ANDROID__
+   /* On Android, ftruncate() always uses 32-bit offsets, even if 
+   ** _FILE_OFFSET_BITS=64 is defined. This means it is unsafe to attempt to
++  ** truncate a file to any size larger than 2GiB. Silently ignore any
+   ** such attempts.  */
+   if( sz>(sqlite3_int64)0x7FFFFFFF ){
+     rc = SQLITE_OK;
+   }else
+ #endif
    do{ rc = osFtruncate(h,sz); }while( rc<0 && errno==EINTR );
    return rc;
  }