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download PDF document: h2ph.1.pdf

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.
-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(1)
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 v5.34.3 2023-12-14 H2PH(1)