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Make the callback optional again

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The C API allows passing a NULL pointer is for the callback function.
However when calling the callback nothing checks for this null pointer
and thus things fail badly.  Even worse since the C API is defined
using an "fn pointer" rather than a "*-ptr" or raw pointer to the
function rust does not realise this can be invalid and therefore the
typechecker does not catch this even though there are no unsafe casts.

Fix this by making the callback an Option in rust, this can be easily
checked when calling.  Also add a Context.call_cb() function which
simplifies calling the callback, hides the weird syntax due to the
function pointer and makes the call a little easier.  Finally it also
means the option checking is only needed in one place.

For the C API this needs to check if this is a NULL pointer or not,
this is implicitly done by rust using the "nullable pointer
optimisation":
https://doc.rust-lang.org/nomicon/ffi.html#the-nullable-pointer-optimization
This commit is contained in:
Floris Bruynooghe
2019-06-17 01:30:22 +02:00
parent 70bfc6d5e0
commit db9bc15d3e
19 changed files with 111 additions and 232 deletions
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17
src/dc_msg.rs
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@@ -577,12 +577,7 @@ pub unsafe fn dc_delete_msgs(context: &Context, msg_ids: *const uint32_t, msg_cn
}
if 0 != msg_cnt {
((*context).cb)(
context,
Event::MSGS_CHANGED,
0i32 as uintptr_t,
0i32 as uintptr_t,
);
context.call_cb(Event::MSGS_CHANGED, 0i32 as uintptr_t, 0i32 as uintptr_t);
dc_job_kill_action(context, 105i32);
dc_job_add(context, 105i32, 0i32, 0 as *const libc::c_char, 10i32);
};
@@ -645,12 +640,7 @@ pub unsafe fn dc_markseen_msgs(context: &Context, msg_ids: *const uint32_t, msg_
}
if 0 != send_event {
((*context).cb)(
context,
Event::MSGS_CHANGED,
0i32 as uintptr_t,
0i32 as uintptr_t,
);
context.call_cb(Event::MSGS_CHANGED, 0i32 as uintptr_t, 0i32 as uintptr_t);
}
}
sqlite3_finalize(stmt);
@@ -1288,8 +1278,7 @@ pub unsafe fn dc_set_msg_failed(context: &Context, msg_id: uint32_t, error: *con
sqlite3_bind_text(stmt, 2i32, (*(*msg).param).packed, -1i32, None);
sqlite3_bind_int(stmt, 3i32, msg_id as libc::c_int);
sqlite3_step(stmt);
((*context).cb)(
context,
context.call_cb(
Event::MSG_FAILED,
(*msg).chat_id as uintptr_t,
msg_id as uintptr_t,