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#!/bin/sh
#
# NAME
#	populate
#
# SYNOPSIS
#	populate target-dir [ source-dir ... ]
#
# DESCRIPTION
#	Adjunct script for GNU C++ to populate a directory with	C++
#	compatible header files.
#
#	For each header file (whose name ends in .h) which resides in one
#	of the indicated source-dirs, create a corresponding file in the
#	target-dir (with the same name) which looks like:
#
#		#ifndef __IN_C_REGION__
#		#define __IN_C_REGION__
#		extern "C" {
#		#include_next <header.h>
#		}
#		#undef __IN_C_REGION__
#		#else
#		#include_next <header.h>
#		#endif
#
#	Where "header.h" is the name of the original header file in the
#	source-dir.
#
#	If a file with the appropriate name already exists in the target
#	directory, it will not be overwritten.
#
# NOTES
#	This script assumes that your native header files are already
#	at least compliant with ANSI C, and that all functions declared
#	therein are properly prototyped (as they must be for C++).
#
#	Currently, this condition is not fully satisfied by many (if any)
#	systems.  On System V Release 4, most of the system header files
#	do seem to be properly prototyped though, and OSF/1 also has
#	prototyped header files, but some of the argument type specifica-
#	tions for some function prototypes in some OSF/1 header files may
#	lack `const' qualifiers in certain places where they ought to appear.
#	(This is due to the fact that OSF/1 conformat to POSIX-1988 rather
#	than to the newer POSIX-1990 standard.)
#
#	If your system's native include files are not properly prototyped,
#	that's OK.  This script will still do it's normal job (in the normal
#	way) but the resulting (indirect) header files will not be very useful
#	for g++ programming unless (and until) somebody puts in all of the
#	prototypes for all of the functions which are declared in these files.
#
#	Note that in some cases, a header file with a given name may exist
#	in two or more of the given source directories.  That's perfectly
#	alright.  Only one (corresponding) header file will be placed into
#	the target directory for each such group of kindred source files.
#
#	This script should probably be invoked from the GCC Makefile, via:
#
#	  populate $(libdir)/g++-include $(libsubdir)/include /usr/include
#
#	That would insure the creation of a C++ compatible set of headers
#	(in the sepcial g++-include directory) corresponding to all of the
#	normal GCC header files and all of the native system's header files.
#
# AUTHOR
#	Ron Guilmette (rfg@ncd.com)
#
# COPYRIGHT
#	This file is part of GNU CC.
#
#	GNU CC is free software; you can redistribute it and/or modify
#	it under the terms of the GNU General Public License as published by
#	the Free Software Foundation; either version 2, or (at your option)
#	any later version.
#
#	GNU CC is distributed in the hope that it will be useful,
#	but WITHOUT ANY WARRANTY; without even the implied warranty of
#	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#	GNU General Public License for more details.
#
#	You should have received a copy of the GNU General Public License
#	along with GNU CC; see the file COPYING.  If not, write to
#	the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

progname=$0
progname=`basename $progname`
original_dir=`pwd`
if [ `echo $1 | wc -w` = 0 ] ; then
  echo $progname\: usage\: $progname target-dir \[ source-dir \.\.\. \]
  exit 1
fi
rel_target_dir=$1
shift

if [ `expr $rel_target_dir : '\(.\)'` != '/' ] ; then
  abs_target_dir=$original_dir/$rel_target_dir
else
  abs_target_dir=$rel_target_dir
fi

if [ \! -d $abs_target_dir ] ; then
  echo $progname\: creating directory $rel_target_dir
  mkdir $abs_target_dir
fi

echo $progname\: populating \`$rel_target_dir\'

if [ `echo $* | wc -w` != 0 ] ; then
  for rel_source_dir in $*; do
    if [ `expr $rel_source_dir : '\(.\)'` != '/' ] ; then
      abs_source_dir=$original_dir/$rel_source_dir
    else
      abs_source_dir=$rel_source_dir
    fi
    echo $progname\: input dir\: \`$rel_source_dir\'
  done
fi

tmp_file=/tmp/$progname.$$
rm -f $tmp_file
echo '#ifndef __IN_C_REGION__' > $tmp_file
echo '#define __IN_C_REGION__' >> $tmp_file
echo 'extern "C" {' >> $tmp_file
echo '#include_next <=>' >> $tmp_file
echo '}' >> $tmp_file
echo '#undef __IN_C_REGION__' >> $tmp_file
echo '#else' >> $tmp_file
echo '#include_next <=>' >> $tmp_file
echo '#endif' >> $tmp_file

if [ `echo $* | wc -w` != 0 ] ; then
  for rel_source_dir in $*; do
    if [ `expr $rel_source_dir : '\(.\)'` != '/' ] ; then
      abs_source_dir=$original_dir/$rel_source_dir
    else
      abs_source_dir=$rel_source_dir
    fi
    if [ \! -d $abs_source_dir ] ; then
      echo $progname\: warning\: no such directory\: \`$rel_source_dir\'
      continue
    fi
    cd $abs_source_dir
    rel_source_subdirs=`find . -type d -print | sed 's%^\./%%' | sed 's/\.//'`
    if [ `echo $rel_source_subdirs | wc -w` != 0 ] ; then
      for rel_source_subdir in $rel_source_subdirs; do
        abs_target_subdir=$abs_target_dir/$rel_source_subdir
        if [ \! -d $abs_target_subdir ] ; then
          mkdir $abs_target_subdir
        fi
      done
    fi
    rel_source_files=`find . -type f -name \*.h -print | sed 's%^\./%%'`
    if [ `echo $rel_source_files | wc -w` != 0 ] ; then
      for rel_source_file in $rel_source_files; do
	abs_source_file=$abs_source_dir/$rel_source_file
	abs_target_file=$abs_target_dir/$rel_source_file
        if [ \! -f $abs_target_file ] ; then
          sed 's%=%'"$rel_source_file"'%' $tmp_file > $abs_target_file
        fi
      done
    fi
  done
fi
rm -f $tmp_file
exit 0