#!/usr/bin/perl

# This is a simple configure script for MacOS and MPW.
# Note that this script can't be run directly from MPW perl
# because it has the wrong end-of-line characters. See README.

# Copyright 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
#
# This file is part of the GNU MP Library.
#
# The GNU MP Library is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 3 of the License, or (at your
# option) any later version.
#
# The GNU MP Library 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 Lesser General Public
# License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.

# ***************************** NOTE **************************************
# This script tries to figure out things about this release but has a hard
# time doing it. It reads some lines in "configure", "Makefile.am" and
# "mp*/Makefile.am" and try to guess things. With every new release
# this script has to be tested.
# ***************************** NOTE **************************************

use strict;

###########################################################################
#
#  Platform dependent
#
###########################################################################

$/ = "\012"			# Input files use Unix end-of-line chars
  if $^O eq 'MacOS';

###########################################################################
#
#  Constants
#
###########################################################################

# Directories to create

my @dirs =
  (
   'MpfObj',
   'MpnObj',
   'MpqObj',
   'MpzObj',
   'PrintfObj',
   'ScanfObj',
   'CmnObj',
   'AsmObj',
   'Asm',
   'MpfBin',
   'MpqBin',
   'MpzBin',
  );

my $cfg;			# Will point to %cfg_apple or %cfg_cw

my %cfg_apple =
  (
   'cc'          =>  'MrC',
   'coptions'    => ['-ansi on -i : -i :: -i ::mpn:powerpc32 -i ::mpz',
		     '-opt speed -inline on'],
   'link'        => 'PPCLink',
   'linkoptions' => '-sym on -xm library',
   'tooloptions' => "-t 'MPST' -c 'MPS'",
   'asm'         => 'PPCAsm',
   'aoptions'    => '-sym on',
   'syslibs'     => [
		     '"{SharedLibraries}"StdCLib',
		     '"{SharedLibraries}"InterfaceLib',
		     '"{SharedLibraries}"MathLib',
		     '"{PPCLibraries}"StdCRuntime.o',
		     '"{PPCLibraries}"PPCCRuntime.o',
		    ],
  );

my %cfg_cw =
  (
   'cc'          =>  'MWCPPC',
   'coptions'    => [
		     '-opt all -w nounusedvar,noextended',
		     '-i :: -i ::mpn:powerpc32 -i ::mpz',
		     '-sym full',
		    ],
   'link'        => 'MWLinkPPC',
   'linkoptions' => '-sym fullpath -library',
   'tooloptions' => '-mpwtool',
   'asm'         => 'PPCAsm',
   'aoptions'    => '-sym on',
   'syslibs'     => [
		     '"{SharedLibraries}"InterfaceLib',
		     '"{MWPPCLibraries}MSL MPWCRuntime.Lib"',
		     '"{MWPPCLibraries}MSL C.PPC MPW(NL).Lib"',
		     '"{SharedLibraries}"MathLib',
		    ],
  );

# We only set the variables that have a value
my %vars =
  (
   'BITS_PER_MP_LIMB' => 32,
   'HAVE_HOST_CPU_FAMILY_power' => 0,
   'HAVE_HOST_CPU_FAMILY_powerpc' => 1,
   'GMP_NAIL_BITS' => 0,
   'DEFN_LONG_LONG_LIMB' => '',
   'LIBGMP_DLL' => 0,
  );

my $make_in      = 'Makefile.in';
my $make         = 'Makefile';
my $configure    = mf("../configure");
my $configure_in = mf("../configure.in");
my $config_in    = mf("../config.in");
my $gmp_h        = mf('../gmp.h');
my $gmp_h_in     = mf('../gmp-h.in');
my $mpn_asm_dir  = "../mpn/powerpc32";
my $mpn_gen_dir  = "../mpn/generic";
my $config_h     = 'config.h';

my $asm_start    = "\ttoc";	# No dot, like ".dot"?

###########################################################################
#
#  Read command line
#
###########################################################################

$cfg = \%cfg_apple;		# Default

if (@ARGV and $ARGV[0] =~ /^cw|co/) {
  $cfg = \%cfg_cw;
  $make .= '.cw';
}

###########################################################################
#
#  Parse top configure file for mpn files
#
###########################################################################

my ($files,$optional,$package,$version) = parse_top_configure($configure);
my %mpn_objects = map {$_ => 1} (@$files,@$optional);
my %mpn_optional = map {$_ => 1} @$optional;

###########################################################################
#
#  Create config.h from ../config.in
#
###########################################################################

my @asm_files;

open(CONFIG_IN, $config_in)
  or die "Can't open \"$config_in\"\n";
open(CONFIG_H, ">$config_h")
  or die "Can't create \"$config_h\"\n";

while (<CONFIG_IN>) {
  chomp;

  if (/^\s*#\s*undef\s+HAVE_NATIVE_mpn_(\w+)/ and
      -r mf("$mpn_asm_dir/$1.asm")) {

    if (defined delete $mpn_objects{$1}) {
      push(@asm_files, $1);
      print CONFIG_H "\#define HAVE_NATIVE_mpn_$1 1\n";
    } else {
      print STDERR "Warning: Found asm file \"$1\" but no corresponding C file - ignoring\n";
    }

  } elsif (/^\s*#\s*undef\s+inline\b/) {
    print CONFIG_H "\#define inline\n";
  } elsif (/^\s*#\s*undef\s+HAVE_STDARG\b/) {
    print CONFIG_H "\#define HAVE_STDARG 1\n";
  } elsif (/^\s*#\s*undef\s+HAVE_STRCHR\b/) {
    print CONFIG_H "\#define HAVE_STRCHR 1\n";
  } elsif (/^\s*#\s*undef\s+HAVE_HOST_CPU_FAMILY_powerpc\b/) {
    print CONFIG_H "\#define HAVE_HOST_CPU_FAMILY_powerpc 1\n";
  } elsif (/^\s*#\s*undef\s+WANT_TMP_NOTREENTRANT\b/) {
    print CONFIG_H "\#define WANT_TMP_NOTREENTRANT 1\n";
  } elsif (/^\s*#\s*undef\s+PACKAGE\b/) {
    print CONFIG_H "\#define PACKAGE \"$package\"\n";
  } elsif (/^\s*#\s*undef\s+VERSION\b/) {
    print CONFIG_H "\#define VERSION \"$version\"\n";
  } elsif (/^\s*#\s*undef\s+STDC_HEADERS\b/) {
    print CONFIG_H "\#define STDC_HEADERS 1\n";
  } else {			# Blank line, leave it
    print CONFIG_H "$_\n";
  }
}

close CONFIG_H;
close CONFIG_IN;

###########################################################################
#
#  Create gmp.h from ../gmp-h.in
#
###########################################################################

open(GMP_H_IN, $gmp_h_in)
  or die "Can't open \"$gmp_h_in\"\n";
open(GMP_H, ">$gmp_h")
  or die "Can't create \"$gmp_h\"\n";

while (<GMP_H_IN>) {
  chomp;			# Remove whatever ending it was

  # Do the variable substitution

  s/\@([^\@]+)\@/exists $vars{$1} ? $vars{$1} : ''/ge;

  print GMP_H "$_\n";
}

close GMP_H;
close GMP_H_IN;

###########################################################################
#
#  Create directories
#
###########################################################################

foreach (@dirs) {
  -d $_ or mkdir $_, 0775
    or die "Can't create directory \"$_\"\n";
}

###########################################################################
#
#  Parse the *.asm files found and convert them to MPW format
#
###########################################################################

my $file;

foreach $file (@asm_files) {
  my $ifile = mf("$mpn_asm_dir/$file.asm");
  my $ofile = mf("Asm/$file.s");
  my $func;
  my %defs = ();

  open(ASM, $ifile)
    or die "Can't read file \"$ifile\"\n";
  open(NEW, ">$ofile")
    or die "Can't create file \"$ofile\"\n";

  while (<ASM>) {
    chomp;			# Remove whatever ending it was

    s/\bdnl\b/;/ or s/\bC\b/;/;	# Use ; comments

    s/include\s*\(.*?\)//;	# Don't use include macro

    s/ASM_START\s*\(.*?\)/$asm_start/;

    if (s/PROLOGUE\s*\(\s*(.*?)\s*\)/asm_prologue($1)/e) {
      $func = $1;
    }

    s/EPILOGUE\s*\(\s*(.*?)\s*\)/asm_epilogue($func)/e;

    s/L\(([^)]*)\)/L$1/g;       # L() style labels

    # register name defines
    if (/\bdefine\(`?([a-zA-Z0-9]+)'?,`?([^')]*)\'?\)/) {
      $defs{$1} = $2;
      $_ = "\n";
    }
    foreach my $i (keys %defs) {
      s/\b\Q$i\E\b/$defs{$i}/g;
    }

    s/\n/\x0D/g;
    print NEW "$_\x0D";		# Use MacOS end-of-line character
  }
  
  close ASM;
  close NEW;
}


###########################################################################
#
#  Parse the Makefile.in and produce the Makefile
#
###########################################################################

# Check if we have optional left in C directory

foreach (keys %mpn_objects) {
  delete $mpn_objects{$_}
    if $mpn_optional{$_} and !-r mf("$mpn_gen_dir/$_.c");
}

my $mpn_objects = join(' ', map {"{MpnObjDir}$_.o"}  sort keys %mpn_objects);
$mpn_objects =~ s/(.{1,66})\s/$1 \xB6\x0D\t/g;

my @asm_objects = @asm_files;
my @asm_sources = @asm_files;

# Adjust configuration

foreach (keys %{$cfg}) {
  $$cfg{$_} = join(" \xB6\x0D\t\t", @{$$cfg{$_}})
    if ref $$cfg{$_};
}

my %config =
  (
   'version' => $version,
   'package' => $package,
   'c'       => "\xB6",
   'dep'     => "\xC4",
   'wildcard'=> "\xC5",
   'asm_objects' =>
   	join(" \xB6\x0D\t",map {$_ = "{AsmObjDir}$_.o"} sort @asm_objects),
   'asm_sources' =>
   	join(" \xB6\x0D\t",map {$_ = "{AsmSrcDir}$_.s"} sort @asm_sources),
   'mpn_objects' => $mpn_objects,
   'mpz_objects' => what_objects("mpz","../mpz","{MpzObjDir}"),
   'mpf_objects' => what_objects("mpf","../mpf","{MpfObjDir}"),
   'mpq_objects' => what_objects("mpq","../mpq","{MpqObjDir}"),
   'printf_objects' => what_objects("printf","../printf","{PrintfObjDir}"),
   'scanf_objects'  => what_objects("scanf","../scanf","{ScanfObjDir}"),
   'gmp_objects' => what_objects("gmp","..",    "{CmnObjDir}"),
   %{$cfg},
  );


open(IN, $make_in)
  or die "Can't read file \"$make_in\"\n";
open(OUT, ">$make")
  or die "Can't create file \"$make\"\n";

while (<IN>) {
  chomp;			# Remove whatever ending it was

  # Do the variable substitution

  s/\@([^\@]+)\@/exists $config{$1} ? $config{$1} : ''/ge;

  print OUT "$_\x0D";		# Use MacOS end-of-line character
}
  
close IN;
close OUT;

###########################################################################
#
#  Parse the configure.in file to find the mpn files to compile and link
#  Find package name and version
#
###########################################################################

sub parse_top_configure {
  my $cfg = shift;

  open(CONFIGURE, $cfg)
    or die "Can't open \"$cfg\"\n";
  my $old_eol = $/;
  undef $/;
  my $text = <CONFIGURE>;
  $/ = $old_eol;
  close CONFIGURE;

  my ($package) = $text =~ /(?:\n|\r)PACKAGE_NAME\s*=\s*(\S+)/;
  my ($version) = $text =~ /(?:\n|\r)PACKAGE_VERSION\s*=\s*(\S+)/;

  my $files = join(' ',$text =~ /(?:\n|\r)gmp_mpn_functions\s*=\s*\"([^\"]+)/);
  $files =~ s/\\/ /g;
  $files =~ s/\$\{?\w*\}?//g;
  my @files = sort split(' ',$files);

  $files = join(' ',$text =~ /(?:\n|\r)gmp_mpn_functions_optional\s*=\s*\"([^\"]+)/);
  $files =~ s/\\/ /g;
  $files =~ s/\$\{?\w*\}?//g;
  my @optional = sort split(' ',$files);

  @files > 30 or die "Can't find mpn files in \"$cfg\"\n";
  defined $package or die "Can't find package name in \"$cfg\"\n";
  defined $version or die "Can't find version name in \"$cfg\"\n";
  return (\@files,\@optional,$package,$version);
}

###########################################################################
#
#  Find the C files for mpz, mpf .....
#
###########################################################################

sub what_objects {
  my $part   = shift;
  my $srcdir = shift;
  my $dstdir = shift;

  my $makefile_am = mf("$srcdir/Makefile.am");

  # We look in the Makefile.am file
  open(MAKEFILE_AM, $makefile_am)
    or die "Can't open file \"$makefile_am\"\n";

  # I had as short version of this using more advanced
  # regular expressions on the whole file content but
  # MacPerl freezes my Mac every time..... :-(

  my $line;
  my $text = '';

  while (defined($line = <MAKEFILE_AM>) ) {
    chomp $line;

    if ($line =~ s/^lib${part}_la_SOURCES\s*=//) {
      do {
	chomp $line;
	if ($line =~ s/\\\s*$//) {
	  $text .= " $line";
	} else {
	  $text .= " $line";
	  next;
	}
      } while (defined($line = <MAKEFILE_AM>));
    }

    if ($line =~ s/^nodist_lib${part}_la_SOURCES\s*=//) {
      do {
	chomp $line;
	if ($line =~ s/\\\s*$//) {
	  $text .= " $line";
	} else {
	  $text .= " $line";
	  last;
	}
      } while (defined($line = <MAKEFILE_AM>));
    }
  }
  close MAKEFILE_AM;

  my @ofiles = split(' ',$text);
  @ofiles > 8 or die "Can't find $part files in \"$makefile_am\"\n";
  my $ofiles = join(' ', map {/^(.+)\.c$/ and $_ = "$dstdir$1.o"} @ofiles);
  $ofiles =~ s/(.{1,66})\s/$1 \xB6\x0D\t/g;

  return $ofiles;
}

###########################################################################
#
#  Assembler
#
###########################################################################

sub asm_epilogue {
    my $func = shift;
    return "\tcsect .__g$func\[pr]";
}

sub asm_prologue {
    my $func = shift;

    my $asm = <<HERE;
	EXPORT __g$func\[DS]
	EXPORT .__g$func\[PR]

	TC __g$func\[TC], __g$func\[DS]
			
	CSECT __g$func\[DS]
	DC.L .__g$func\[PR]
	DC.L TOC[tc0]
		
	CSECT .__g$func\[PR]
	FUNCTION .__g$func\[PR]	
HERE
    return $asm;
}


###########################################################################
#
#  Platform dependent filename conversion
#
###########################################################################

sub mf {
  my $path = shift;

  return $path unless $^O eq 'MacOS';

  $path =~ /:/ and die "File name already converted to mac format: $path\n";

  if ($path =~ s&^/&&) {
    # Absolute path
    unless ($path =~ s&/&:&g) {
      # This is a drive name
      $path .= ':';
    }
  } else {
    # Relative path
    if ($path =~ s&/&:&g) {
      # Contains slash
      $path = ":$path";
      $path =~ s&\.\.:&:&g;
    } else {
      # Plain file name, no directory part
    }
  }
  return $path;
}