Useful if you're going to reuse a buffer later.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Since we use -Wundef by default, ccanlint gets upset if __X86_64__ isn't set.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

If _info handles the arg "ported" it should print out 1 or 0; 0 means
it can't be compiled/run/tested on this platform.  This lets ccanlint
easily skip such modules.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

~0 will be signed and negative on any 2s complement system, and
left shifting a negative value has undefined behaviour in C.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

idtree.c:146 triggers a "comparison is always false" warning on some
compiler configurations, since the 'id' variable is unsigned.

Elsewhere in the module ids seem to be represented by (signed) ints, so
use the same convention here, suppressing the warning and also maybe being
more correct in other ways.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

The HTABLE_DEFINE_TYPE macro builds a type-specific hash table by
constructing a bunch of simple wrapper functions.  The user of the hash
table may not end up using all of these.  With gcc the fact that the
functions are inline stops an warnings about unused functions, but that's
not the case with clang.

Suppress these warnings by marking all the constructed functions except
for name##_add() as UNNEEDED (using the macro from ccan/compiler).  _add
is left alone on the grounds that a hash table you never add anything to
isn't much use, so this will help you to spot an entirely redundant
HTABLE_DEFINE_TYPE invocation.  *_init() would be a more obvious choice,
except that there is both *_init() and *_init_sized() and you only need
to use one of these.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

The usual way of construction strmap objects is to use the STRMAP_MEMBERS()
macro which expands to both a raw strmap structure and a tcon type canary.
However, the tcon type canary involves a flexible array member which means
that in standard C99 STRMAP_MEMBERS() must appear only at the end of a
structure definition.  But worse, that structure can then only appear at
the end of any other structure it is included in, which is pretty
inconvenient for the intended purpose of creating type specific strmaps.

gcc extensions allow this to work (somehow), but clang complains loudly
about it.

The tcon module already includes the TCON_WRAP() mechanism, which already
provides this same sort of type-specific definitions in a more general way.
So convert strmap (and its users) to that approach.

This removes STRMAP_MEMBERS() entirely, breaking compatibility.  I'm hoping
strmap is used in few enough places that we can get away with that.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

It does not seem to respect stack games!
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

altstack - run a function with a dedicated stack, and then release the memory
Signed-off-by: Dan Good <dan@dancancode.com>

bfs_dequeue() and dfs_pop() discard the return values of lqueue_dequeue()
and lstack_pop() respectively.  This is correct, but causes warnings in
some compiler configurations (including the one currently used by
travis-ci.org).

Use the cast-to-void idiom to tell the compiler this is intentional.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

The 'rest' variable in examples_run.c:find_expect() was unused.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

configurator.c contains an if with an empty statement on the same line as
the condition.  This is very easy to misread, and also causes a warning
from clang, so move the ; onto the next line.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Still not exactly a great coverage of different C compilers, but clearly
better than *just* gcc.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

rszshm - resizable pointer-safe shared memory
Signed-off-by: Dan Good <dan@dancancode.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Thanks to the detailed feedback from David Gibson, I made the
following improvements:

* add missing includes
* check for statement expression support, give an error if absent
* ccanlint directive to skip "without features" steps
* add license ref to top of source files
* rename run1.c test to api1.c
Signed-off-by: Dan Good <dan@dancancode.com>

deque - type-preserving resizing circular deque
Signed-off-by: Dan Good <dan@dancancode.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

 progress found but fubar in MOD

is now:

 'progress' found but 'fubar' in MOD
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

The webfont forces http, which results in a mixed content warning if
you're visiting the site on https. Strip the protocol so we use whatever
the user has connected with.
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

The SVN mirror disappeared some time ago. It now lives on Github.
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

This patch adds a new test graph "shortcut2" which includes a negative cost
edge.  Along with that we add a testcase for Dijkstra's algorithm checking
that it gracefully fails in this case.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

For all the existing test graphs, the shortest path by cost is also the
shortest path by number of edges.  This patch adds a new test graph where
that is not the case, in order to test that the Dijkstra's algorithm
implementation correctly handles that case.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

At the moment the "parallel" test graph just uses the default cost of 1
for all the links between the two nodes.  This patch changes that so that
the links have cost 2, except (optionally) one with cost 1.  This provides
a useful test for the Dijkstra's algorithm implementation to ensure that
it picks the correct link for the shortest path.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Implement Dijkstra's algorithm for one-source shortest-path.

This uses the lpq module as the implementation of the priority queue.  That
means this implementation is some way behind the theoretical efficiency of
Dijkstra's algorithm.  It should be reasonably straightforward to swap out
the priority queue for a better one in the future, though.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

This allows the edge_info callback to supply a cost or length for an edge.
For now we only support 'long' valued costs.  If the callback doesn't
supply a cost, it's considered cost 1.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>