h2ph Man page

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

NAME

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

SYNOPSIS

h2ph [-d destination directory] [-r | -a] [-l] [-h] [-e] [-D] [-Q] [headerfiles]

DESCRIPTION

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/*

or

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

or

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.

OPTIONS

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

-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 ordinarily uses. -a and -r are
mutually exclusive.

-l Symbolic links will be replicated in the destination directory. If
-l is not specified, 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 cryptic

[ 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.

-e If an error is encountered during conversion, output file will be
removed and a warning emitted instead of terminating the conversion
immediately.

-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.

ENVIRONMENT
No environment variables are used.

FILES
/usr/include/*.h
/usr/include/sys/*.h

etc.

AUTHOR

Larry Wall

SEE ALSO

perl

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

BUGS

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 {
FIRST_VALUE,
SECOND_VALUE,
#ifdef ABC
THIRD_VALUE
#endif
};

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

perl v5.22.1 2016-03-13 H2PH(1)