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13125336
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2012-10-29T16:06:03.450
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2012-10-29T22:06:47.463
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2012-10-29T22:06:47.463
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I just posted <a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55119" rel="nofollow">GCC bug 55119</a> on this. While you're waiting (!), the code below works on Mac OS X Mountain Lion. On Windows, it's more complicated; see <code>adainclude/adaint.{c,h}</code>. The Ada spec: <pre><code>with Ada.Directories; package Large_Files is function Size (Name : String) return Ada.Directories.File_Size; end Large_Files; </code></pre> and body (copied in part from <code>Ada.Directories</code>): <pre><code>with GNAT.OS_Lib; with System; package body Large_Files is function Size (Name : String) return Ada.Directories.File_Size is C_Name : String (1 .. Name'Length + 1); function C_Size (Name : System.Address) return Long_Long_Integer; pragma Import (C, C_Size, "large_file_length"); begin if not GNAT.OS_Lib.Is_Regular_File (Name) then raise Ada.Directories.Name_Error with "file """ & Name & """ does not exist"; else C_Name (1 .. Name'Length) := Name; C_Name (C_Name'Last) := ASCII.NUL; return Ada.Directories.File_Size (C_Size (C_Name'Address)); end if; end Size; end Large_Files; </code></pre> and the C interface: <pre><code>/* large_files_interface.c */ #include <sys/stat.h> long long large_file_length (const char *name) { struct stat statbuf; if (stat(name, &statbuf) != 0) { return 0; } else { return (long long) statbuf.st_size; } } </code></pre> You might need to use <code>struct stat64</code> and <code>stat64()</code> on other Unix systems. Compile the C interface as normal, then add <code>-largs large_files_interface.o</code> to your gnatmake command line. EDIT: on Mac OS X (and Debian), which are x86_64 machines, <code>sizeof(long)</code> is 8 bytes; so the comment in <code>adaint.c</code> is misleading and <code>Ada.Directories.Size</code> can return up to 2**63-1.
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