Signed-off-by: Simon McVittie <smcv@collabora.com>

We also need to wrap realloc() to dispatch pointers to the correct
free/alloc implementation.

glibc voodoo moved to its own header to make it easy to drop once
we don't need it any more

malloc/free cluster of functions moved into their own sub-struct
pointer so they don't perturb the main capsule namespace struct
layout if/when they change (as we expect them to).

abstract out the arcane memory checks so that the new realloc
wrapper can share them with the free wrapper

malloc/calloc/realloc/posix_memalign are simply replaced by
their external counterparts.

free() gets a wrapper which route the pointer to the hopefully
correct free() implementation.

~/.local/share/Steam/ubuntu12_32/steam has a symbol with a weird
binding type part way through its symbol table:

46 [OBJECT   LOOS/GNU_UNIQUE] size: 0 (0)_ZNSs4_Rep20_S_empty_rep_storageE 0000 (nil)

but we can't just stop there, because there are symbols after it that
need relocating.

I blame C++.

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

These are the same ones special-cased by Flatpak, although Flatpak
would generate a minimal /etc/passwd and /etc/group rather than using
the ones from the host system.

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

libOpenGL can be combined with libGLX (to get approximately the
equivalent of the legacy libGL), or with libEGL.

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Mesa maintainer Emil Velikov informs me that both apps/games and the
graphics driver are allowed to use libgbm, at least on Mesa systems,
so we will need to encapsulate it.

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

This avoids reinventing it.

Signed-off-by: Simon McVittie <smcv@collabora.com>

The cast that hid the change of the void * parameter to a concrete type
masked the bug that we were returning an int-sized integer, not a
pointer-sized integer. Because we only support little-endian platforms
so far, we seem to have got away with it.

Signed-off-by: Simon McVittie <smcv@collabora.com>

As well as detecting truncation and maybe some corner-case overflows,
this fixes a long-standing TODO item: capsule-version with prefix
set to "/" no longer outputs a path starting with //lib or //usr/lib.

Signed-off-by: Simon McVittie <smcv@collabora.com>

This seemed easier than fixing the corner cases individually.

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

As in the previous commit, it seems unnecessarily confusing to have
prefix.path (when interpreted as a C string) not be the path of the
prefix.

Signed-off-by: Simon McVittie <smcv@collabora.com>

Previously, we'd write /etc/ld.so.cache into prefix.path[prefix.len:]:

    /host/etc/ld.so.cache\0\0...
    |<->||<------------>|
     len   temporarily used

and delete it again later with sanitise_ldlibs(). But that seems
unnecessarily confusing: the contents of prefix.path when interpreted
as an ordinary \0-terminated C string are sometimes the prefix, but
sometimes edited in-place to be the name of a file within the prefix.

Signed-off-by: Simon McVittie <smcv@collabora.com>

This makes it a little simpler to reason about.

Signed-off-by: Simon McVittie <smcv@collabora.com>