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Top Forums Programming Some questions regarding old if.c Post 302930217 by orbit on Wednesday 31st of December 2014 02:19:26 PM
Old 12-31-2014
Some questions regarding old if.c

Hey Smilie
I have some questions regarding the old unix if command.
(see man pageman.cat-v.org/unix-6th/1/if

Here I uploaded the source code: (it's a bit too long, to put it here)
pastebin.com/bj0Hvfrw

Now my questions:

1.) Line 14: The function exp() is called with no arguments. But the function is declared as exp(s), so it needs an argument. Why is this working?


2.) What's happening there with exp() -> e1() -> e2() -> e3()... I think it's called recursive descent parsing, but I don't really get it. Could you help me a bit there.

Last edited by orbit; 01-02-2015 at 12:33 PM..
 

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JH_GENERATEORBITDIR(1)						    Javahelper						    JH_GENERATEORBITDIR(1)

NAME
jh_generateorbitdir - Creates and populates an orbit dir used by pde-build for third-party jar files. SYNOPSIS
jh_generateorbitdir [debhelperoptions] [--orbit-dir=dir] [orbit-dep[...]] DESCRIPTION
jh_generateorbitdir is a javahelper program that handles creation of an orbit dependency dir. This directory has to be populated with non- eclipse jar files. However, eclipse refers to these jars by their "symbolic name". jh_generateorbitdir can extract this name from the jar's manifest (provided it has the OSGi metadata) and create a symlink to it. jh_generateorbitdir will replace regular files with symlinks if they are present in the orbit dir and clash with the name of one of the orbit jars. If an orbit jar name clashes with a symlink in the orbit dir, then jh_generateorbitdir will assume that the given jar has already been symlinked correctly. In this case the jar file is still recorded in the cache (see below). jh_generateorbitdir will also check the default installation for jar files on Debian systems (at the time of writing /usr/share/java), if it cannot find the jar in the current dir. Jar files replaced by jh_generateorbitdir will be recorded so that jh_installeclipse can replace with symlinks them post install. FILES
debian/eclipse.orbitdeps List of orbit dependencies - one per line. This can be used as an alternative to passing it per command line. OPTIONS
--orbit-dir=dir Specifies the directory from where the orbit-dir is or should be created. Defauls to "debian/.eclipse_build/orbitdeps". EXAMPLE
jh_generateorbitdir --orbit-dir orbit asm3 oro Will generate a folder called orbit with two symlinks based on asm3 and oro's symbolic name. SEE ALSO
debhelper(7) This program is a part of javahelper and uses debhelper as backend. There are also tutorials in /usr/share/doc/javahelper. AUTHOR
Niels Thykier <niels@thykier.net> COPYRIGHT AND LICENSE
Copyright 2010 by Niels Thykier This tool is free software; you may redistribute it and/or modify it under the terms of GNU GPL 2. 0.43 2011-04-29 JH_GENERATEORBITDIR(1)
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