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H2PH(1) 			 Perl Programmers Reference Guide			  H2PH(1)

       h2ph - convert .h C header files to .ph Perl header files

       h2ph [-d destination directory] [-r | -a] [-l] [headerfiles]

       h2ph converts any C header files specified to the corresponding Perl header file format.
       It is most easily run while in /usr/include:

	       cd /usr/include; h2ph * sys/*


	       cd /usr/include; h2ph * sys/* arpa/* netinet/*


	       cd /usr/include; h2ph -r -l .

       The output files are placed in the hierarchy rooted at Perl's architecture dependent
       library directory.  You can specify a different hierarchy with a -d switch.

       If run with no arguments, filters standard input to standard output.

       -d destination_dir
	   Put the resulting .ph files beneath destination_dir, instead of beneath the default
	   Perl library location ($Config{'installsitsearch'}).

       -r  Run recursively; if any of headerfiles are directories, then run h2ph on all files in
	   those directories (and their subdirectories, etc.).	-r and -a are mutually exclusive.

       -a  Run automagically; convert headerfiles, as well as any .h files which they include.
	   This option will search for .h files in all directories which your C compiler ordinar-
	   ily uses.  -a and -r are mutually exclusive.

       -l  Symbolic links will be replicated in the destination directory.  If -l is not speci-
	   fied, then links are skipped over.

       -h  Put ``hints'' in the .ph files which will help in locating problems with h2ph.  In
	   those cases when you require a .ph file containing syntax errors, instead of the cryp-

		   [ some error condition ] at (eval mmm) line nnn

	   you will see the slightly more helpful

		   [ some error condition ] at filename.ph line nnn

	   However, the .ph files almost double in size when built using -h.

       -D  Include the code from the .h file as a comment in the .ph file.  This is primarily
	   used for debugging h2ph.

       -Q  ``Quiet'' mode; don't print out the names of the files being converted.

       No environment variables are used.



       Larry Wall


       The usual warnings if it can't read or write the files involved.

       Doesn't construct the %sizeof array for you.

       It doesn't handle all C constructs, but it does attempt to isolate definitions inside
       evals so that you can get at the definitions that it can translate.

       It's only intended as a rough tool.  You may need to dicker with the files produced.

       You have to run this program by hand; it's not run as part of the Perl installation.

       Doesn't handle complicated expressions built piecemeal, a la:

	   enum {
	   #ifdef ABC

       Doesn't necessarily locate all of your C compiler's internally-defined symbols.

perl v5.8.0				    2003-02-18					  H2PH(1)
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