1al_make_path_canonical(3)  Library Functions Manual  al_make_path_canonical(3)
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NAME

6       al_make_path_canonical
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SYNOPSIS

9              #include <allegro5/allegro.h>
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11              bool al_make_path_canonical(ALLEGRO_PATH *path)
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DESCRIPTION

14       Removes  any  leading  '..'  directory  components  in  absolute paths.
15       Removes all '.' directory components.
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17       Note that this does not collapse “x/../y” sections into “y”.   This  is
18       by  design.   If “/foo” on your system is a symlink to “/bar/baz”, then
19       “/foo/../quux” is actually “/bar/quux”, not “/quux” as a naive  removal
20       of “..” components would give you.
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24Allegro reference manual                             al_make_path_canonical(3)