NetNews Usenet Archive 1992 #16/NN_1992_16.iso/spool/comp/lang/c/11478

Internet Message Format | 1992-07-22 | 2.7 KB

Path: sparky!uunet!mcsun!fuug!demos!kiae!glas!demos!druid.uucp!darcy
From: [e-mail]
Newsgroups: comp.lang.c
Date: 18 Jul 92 03:26 MDT
Subject: Simple preprocessor
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Nf-ID: #N:[e-mail]:-1295377463:001:2384
Nf-From: druid.uucp!darcy    Jul 18 03:26:00 1992
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[e-mail] (Steve Summit) writes:
>Once of these days, someone should write a good, simple
>preprocessor, perhaps simply a stripped-down cpp, that handled
>#include, #ifdef, and simple #define (and *maybe* macros with
>arguments), which *would* be appropriate for general-purpose,
>non-C preprocessing tasks such as Makefiles, calendar files,
>crontab files, etc.  (Hmm; gotta write myself another note.)

TA DA!!!

Introducing mkfiles(3) (Actually that's too much like a BSD utility I
believe but that's the name I started with.  I'll probably change it.)

It's not quite ready for distribution yet but here is a glimpse.

First of all the '#' is a comment character like just about every
Unix utility except cc.  Blank lines are ignored.  There are hooks
if you need '#'  or blank lines in the output.

Preprocessor directives start with '@'.  These include;

  @DEFINE          Define a macro
  @DEFAULT         Like @DEFINE but only if not already defined
  @UNDEFINE        Undef same
  @INCLUDE         Include a file
  @PACKAGE         Include a file from a predefined directory
  @FILE            Redirect output to a new file
  @PRINT           Print to standard output regardless of current output
  @SHOW            Show defined macros (for debugging)
  @CLEAR           Clear all macros to a specific point
  @IFDEF           Conditional
  @IFNDEF               "
  @ELIFDEF             "
  @ELIFNDEF            "
  @ELSE                "
  @ENDIF           End conditional
  @QUOTE           Quote all lines (a specialty thing I needed)
  @FOR             For loop construct
  @END             End for loop
  @ERROR           Print message and exit

Macros can take arguments and defaults can be specified for the arguments.
Here is a sample macro:
    @DEFINE foo bar $(1:zap)
And it's expansion:
    $(foo:goo)    ==>     bar goo
    $(foo)        ==>     bar zap

The sample script creates a skeleton SVR4 device driver including the
system files, Makefile, Bare C file, etc.

The distribution includes my getarg(3) and getline(3), valuable utilities
in their own right if I say so myself.

I have a little more testing to do on it and then I will probably post it.

--
D'Arcy J.M. Cain (darcy@druid)     |
D'Arcy Cain Consulting             |   There's no government
Toronto, Ontario, Canada           |   like no government!
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