rename diff_atom->d to diff_atom->root, because it always is The idea was that for each diff box within the files, the atoms would have a backpointer to the current layer of diff_data (indicating the current section), but it is not actually needed to update the backpointer in each atom to the current diff_data. That is why the current code always points atom->d to the root diff_data for the entire file. Clarify by proper name. Constructs like atom->d->root->foo are redundant, just use atom->root->foo.

move headers from include/diff/ to include/; makes things easier for consumers

repair DEBUG build

move some definitions from the public diff_main.h to an internal header file

use buffered stdio if falling back on file i/o; this is much faster

return error instead of abort()

rename 'debug.h' to 'diff_debug.h'

avoid include statements in header files; make each .c pull in what's needed

replace enum diff_rc errors with plain errno values

fall back on file i/o in case an input file cannot be memory-mapped

KNF: use max 80 columns

KNF: function declaration return types on separate line

Kill unused variables

initial commit