Add a test macro to compare two buffers (which are not already known
to be the same length) for equality.

https://bugzilla.gnome.org/show_bug.cgi?id=754283

Include unistd.h only on *NIX and define items as necessary on Windows,
also replace instances of ssize_t with the GLib-equivilant gssize so to fix
the build on platforms that do not have ssize_t, such as Visual C++.

https://bugzilla.gnome.org/show_bug.cgi?id=711047

The overridden implementation of the skip method for
GLocalFileInputStream allows skipping past the end of the file which is
inconsistent with the documentation.  Prevent this by first seeking to
the end of the file and then seeking backwards from there as much as
is necessary.

https://bugzilla.gnome.org/show_bug.cgi?id=711048

Very many testcases, some GLib tools (resource compiler, etc) and
GApplication were calling g_type_init().

Remove those uses, as they are no longer required.

https://bugzilla.gnome.org/show_bug.cgi?id=686161

==10395== 80 (24 direct, 56 indirect) bytes in 1 blocks are definitely lost in loss record 529 of 561
==10395==    at 0x4005BDC: malloc (vg_replace_malloc.c:195)
==10395==    by 0x4057094: g_malloc (gmem.c:134)
==10395==    by 0x406F2D6: g_slice_alloc (gslice.c:836)
==10395==    by 0x406F31B: g_slice_alloc0 (gslice.c:848)
==10395==    by 0x403A751: g_error_new_valist (gerror.c:54)
==10395==    by 0x403AAD4: g_set_error (gerror.c:240)
==10395==    by 0x4230328: _g_local_file_output_stream_create (glocalfileoutputstream.c:628)
==10395==    by 0x4227A04: g_local_file_create_readwrite (glocalfile.c:1388)
==10395==    by 0x418974C: g_file_create_readwrite (gfile.c:1784)
==10395==    by 0x8049FCD: test_g_file_create_readwrite (readwrite.c:187)

Bug #628331.

And use g_assert_[no_]error().

==2392== 49 (24 direct, 25 indirect) bytes in 1 blocks are definitely lost in loss record 451 of 573
==2392==    at 0x4005BDC: malloc (vg_replace_malloc.c:195)
==2392==    by 0x4057094: g_malloc (gmem.c:134)
==2392==    by 0x406F2D6: g_slice_alloc (gslice.c:836)
==2392==    by 0x406F31B: g_slice_alloc0 (gslice.c:848)
==2392==    by 0x403A8A6: g_error_new_literal (gerror.c:117)
==2392==    by 0x403AC31: g_set_error_literal (gerror.c:314)
==2392==    by 0x41B7619: g_output_stream_set_pending (goutputstream.c:1198)
==2392==    by 0x41B5799: g_output_stream_write (goutputstream.c:210)
==2392==    by 0x41B590B: g_output_stream_write_all (goutputstream.c:268)
==2392==    by 0x8049B54: verify_iostream (readwrite.c:110)

Bug #628331.

==2392== 38 (16 direct, 22 indirect) bytes in 1 blocks are definitely lost in loss record 369 of 573
==2392==    at 0x4005BDC: malloc (vg_replace_malloc.c:195)
==2392==    by 0x4057094: g_malloc (gmem.c:134)
==2392==    by 0x406F2D6: g_slice_alloc (gslice.c:836)
==2392==    by 0x406F31B: g_slice_alloc0 (gslice.c:848)
==2392==    by 0x413D5BB: g_type_create_instance (gtype.c:1867)
==2392==    by 0x412372A: g_object_constructor (gobject.c:1482)
==2392==    by 0x4122E1D: g_object_newv (gobject.c:1266)
==2392==    by 0x4122B93: g_object_new (gobject.c:1178)
==2392==    by 0x4225D74: _g_local_file_new (glocalfile.c:310)
==2392==    by 0x4231897: g_local_vfs_get_file_for_path (glocalvfs.c:84)
==2392==    by 0x41CF91C: g_vfs_get_file_for_path (gvfs.c:94)
==2392==    by 0x41911B6: g_file_new_for_path (gfile.c:5898)
==2392==    by 0x804A2B9: test_g_file_replace_readwrite (readwrite.c:235)

Bug #628331.

==2392== 38 (16 direct, 22 indirect) bytes in 1 blocks are definitely lost in loss record 368 of 573
==2392==    at 0x4005BDC: malloc (vg_replace_malloc.c:195)
==2392==    by 0x4057094: g_malloc (gmem.c:134)
==2392==    by 0x406F2D6: g_slice_alloc (gslice.c:836)
==2392==    by 0x406F31B: g_slice_alloc0 (gslice.c:848)
==2392==    by 0x413D5BB: g_type_create_instance (gtype.c:1867)
==2392==    by 0x412372A: g_object_constructor (gobject.c:1482)
==2392==    by 0x4122E1D: g_object_newv (gobject.c:1266)
==2392==    by 0x4122B93: g_object_new (gobject.c:1178)
==2392==    by 0x4225D74: _g_local_file_new (glocalfile.c:310)
==2392==    by 0x4231897: g_local_vfs_get_file_for_path (glocalvfs.c:84)
==2392==    by 0x41CF91C: g_vfs_get_file_for_path (gvfs.c:94)
==2392==    by 0x41911B6: g_file_new_for_path (gfile.c:5898)
==2392==    by 0x8049F23: test_g_file_create_readwrite (readwrite.c:183)

Bug #628331.

==2392== 38 (16 direct, 22 indirect) bytes in 1 blocks are definitely lost in loss record 367 of 573
==2392==    at 0x4005BDC: malloc (vg_replace_malloc.c:195)
==2392==    by 0x4057094: g_malloc (gmem.c:134)
==2392==    by 0x406F2D6: g_slice_alloc (gslice.c:836)
==2392==    by 0x406F31B: g_slice_alloc0 (gslice.c:848)
==2392==    by 0x413D5BB: g_type_create_instance (gtype.c:1867)
==2392==    by 0x412372A: g_object_constructor (gobject.c:1482)
==2392==    by 0x4122E1D: g_object_newv (gobject.c:1266)
==2392==    by 0x4122B93: g_object_new (gobject.c:1178)
==2392==    by 0x4225D74: _g_local_file_new (glocalfile.c:310)
==2392==    by 0x4231897: g_local_vfs_get_file_for_path (glocalvfs.c:84)
==2392==    by 0x41CF91C: g_vfs_get_file_for_path (gvfs.c:94)
==2392==    by 0x41911B6: g_file_new_for_path (gfile.c:5898)
==2392==    by 0x8049E30: test_g_file_open_readwrite (readwrite.c:153)

Bug #628331.

Some buildd environments have an unwritable $HOME, which makes the
test that looks for an unexisting file there fail. Use $TMP instead,
which should be more reliable.

https://bugzilla.gnome.org/show_bug.cgi?id=610860