[xemacs-hg @ 2001-09-20 06:28:42 by ben] The great integral types renaming. The purpose of this is to rationalize the names used for various integral types, so that they match their intended uses and follow consist conventions, and eliminate types that were not semantically different from each other. The conventions are: -- All integral types that measure quantities of anything are signed. Some people disagree vociferously with this, but their arguments are mostly theoretical, and are vastly outweighed by the practical headaches of mixing signed and unsigned values, and more importantly by the far increased likelihood of inadvertent bugs: Because of the broken "viral" nature of unsigned quantities in C (operations involving mixed signed/unsigned are done unsigned, when exactly the opposite is nearly always wanted), even a single error in declaring a quantity unsigned that should be signed, or even the even more subtle error of comparing signed and unsigned values and forgetting the necessary cast, can be catastrophic, as comparisons will yield wrong results. -Wsign-compare is turned on specifically to catch this, but this tends to result in a great number of warnings when mixing signed and unsigned, and the casts are annoying. More has been written on this elsewhere. -- All such quantity types just mentioned boil down to EMACS_INT, which is 32 bits on 32-bit machines and 64 bits on 64-bit machines. This is guaranteed to be the same size as Lisp objects of type `int', and (as far as I can tell) of size_t (unsigned!) and ssize_t. The only type below that is not an EMACS_INT is Hashcode, which is an unsigned value of the same size as EMACS_INT. -- Type names should be relatively short (no more than 10 characters or so), with the first letter capitalized and no underscores if they can at all be avoided. -- "count" == a zero-based measurement of some quantity. Includes sizes, offsets, and indexes. -- "bpos" == a one-based measurement of a position in a buffer. "Charbpos" and "Bytebpos" count text in the buffer, rather than bytes in memory; thus Bytebpos does not directly correspond to the memory representation. Use "Membpos" for this. -- "Char" refers to internal-format characters, not to the C type "char", which is really a byte. -- For the actual name changes, see the script below. I ran the following script to do the conversion. (NOTE: This script is idempotent. You can safely run it multiple times and it will not screw up previous results -- in fact, it will do nothing if nothing has changed. Thus, it can be run repeatedly as necessary to handle patches coming in from old workspaces, or old branches.) There are two tags, just before and just after the change: `pre-integral-type-rename' and `post-integral-type-rename'. When merging code from the main trunk into a branch, the best thing to do is first merge up to `pre-integral-type-rename', then apply the script and associated changes, then merge from `post-integral-type-change' to the present. (Alternatively, just do the merging in one operation; but you may then have a lot of conflicts needing to be resolved by hand.) Script `fixtypes.sh' follows: ----------------------------------- cut ------------------------------------ files="*.[ch] s/*.h m/*.h config.h.in ../configure.in Makefile.in.in ../lib-src/*.[ch] ../lwlib/*.[ch]" gr Memory_Count Bytecount $files gr Lstream_Data_Count Bytecount $files gr Element_Count Elemcount $files gr Hash_Code Hashcode $files gr extcount bytecount $files gr bufpos charbpos $files gr bytind bytebpos $files gr memind membpos $files gr bufbyte intbyte $files gr Extcount Bytecount $files gr Bufpos Charbpos $files gr Bytind Bytebpos $files gr Memind Membpos $files gr Bufbyte Intbyte $files gr EXTCOUNT BYTECOUNT $files gr BUFPOS CHARBPOS $files gr BYTIND BYTEBPOS $files gr MEMIND MEMBPOS $files gr BUFBYTE INTBYTE $files gr MEMORY_COUNT BYTECOUNT $files gr LSTREAM_DATA_COUNT BYTECOUNT $files gr ELEMENT_COUNT ELEMCOUNT $files gr HASH_CODE HASHCODE $files ----------------------------------- cut ------------------------------------ `fixtypes.sh' is a Bourne-shell script; it uses 'gr': ----------------------------------- cut ------------------------------------ #!/bin/sh # Usage is like this: # gr FROM TO FILES ... # globally replace FROM with TO in FILES. FROM and TO are regular expressions. # backup files are stored in the `backup' directory. from="$1" to="$2" shift 2 echo ${1+"$@"} | xargs global-replace "s/$from/$to/g" ----------------------------------- cut ------------------------------------ `gr' in turn uses a Perl script to do its real work, `global-replace', which follows: ----------------------------------- cut ------------------------------------ : #-*- Perl -*- ### global-modify --- modify the contents of a file by a Perl expression ## Copyright (C) 1999 Martin Buchholz. ## Copyright (C) 2001 Ben Wing. ## Authors: Martin Buchholz <martin@xemacs.org>, Ben Wing <ben@xemacs.org> ## Maintainer: Ben Wing <ben@xemacs.org> ## Current Version: 1.0, May 5, 2001 # This program 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. # # This program 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 XEmacs; see the file COPYING. If not, write to the Free # Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA # 02111-1307, USA. eval 'exec perl -w -S $0 ${1+"$@"}' if 0; use strict; use FileHandle; use Carp; use Getopt::Long; use File::Basename; (my $myName = $0) =~ s@.*/@@; my $usage=" Usage: $myName [--help] [--backup-dir=DIR] [--line-mode] [--hunk-mode] PERLEXPR FILE ... Globally modify a file, either line by line or in one big hunk. Typical usage is like this: [with GNU print, GNU xargs: guaranteed to handle spaces, quotes, etc. in file names] find . -name '*.[ch]' -print0 | xargs -0 $0 's/\bCONST\b/const/g'\n [with non-GNU print, xargs] find . -name '*.[ch]' -print | xargs $0 's/\bCONST\b/const/g'\n The file is read in, either line by line (with --line-mode specified) or in one big hunk (with --hunk-mode specified; it's the default), and the Perl expression is then evalled with \$_ set to the line or hunk of text, including the terminating newline if there is one. It should destructively modify the value there, storing the changed result in \$_. Files in which any modifications are made are backed up to the directory specified using --backup-dir, or to `backup' by default. To disable this, use --backup-dir= with no argument. Hunk mode is the default because it is MUCH MUCH faster than line-by-line. Use line-by-line only when it matters, e.g. you want to do a replacement only once per line (the default without the `g' argument). Conversely, when using hunk mode, *ALWAYS* use `g'; otherwise, you will only make one replacement in the entire file! "; my %options = (); $Getopt::Long::ignorecase = 0; &GetOptions ( \%options, 'help', 'backup-dir=s', 'line-mode', 'hunk-mode', ); die $usage if $options{"help"} or @ARGV <= 1; my $code = shift; die $usage if grep (-d || ! -w, @ARGV); sub SafeOpen { open ((my $fh = new FileHandle), $_[0]); confess "Can't open $_[0]: $!" if ! defined $fh; return $fh; } sub SafeClose { close $_[0] or confess "Can't close $_[0]: $!"; } sub FileContents { my $fh = SafeOpen ("< $_[0]"); my $olddollarslash = $/; local $/ = undef; my $contents = <$fh>; $/ = $olddollarslash; return $contents; } sub WriteStringToFile { my $fh = SafeOpen ("> $_[0]"); binmode $fh; print $fh $_[1] or confess "$_[0]: $!\n"; SafeClose $fh; } foreach my $file (@ARGV) { my $changed_p = 0; my $new_contents = ""; if ($options{"line-mode"}) { my $fh = SafeOpen $file; while (<$fh>) { my $save_line = $_; eval $code; $changed_p = 1 if $save_line ne $_; $new_contents .= $_; } } else { my $orig_contents = $_ = FileContents $file; eval $code; if ($_ ne $orig_contents) { $changed_p = 1; $new_contents = $_; } } if ($changed_p) { my $backdir = $options{"backup-dir"}; $backdir = "backup" if !defined ($backdir); if ($backdir) { my ($name, $path, $suffix) = fileparse ($file, ""); my $backfulldir = $path . $backdir; my $backfile = "$backfulldir/$name"; mkdir $backfulldir, 0755 unless -d $backfulldir; print "modifying $file (original saved in $backfile)\n"; rename $file, $backfile; } WriteStringToFile ($file, $new_contents); } } ----------------------------------- cut ------------------------------------ In addition to those programs, I needed to fix up a few other things, particularly relating to the duplicate definitions of types, now that some types merged with others. Specifically: 1. in lisp.h, removed duplicate declarations of Bytecount. The changed code should now look like this: (In each code snippet below, the first and last lines are the same as the original, as are all lines outside of those lines. That allows you to locate the section to be replaced, and replace the stuff in that section, verifying that there isn't anything new added that would need to be kept.) --------------------------------- snip ------------------------------------- /* Counts of bytes or chars */ typedef EMACS_INT Bytecount; typedef EMACS_INT Charcount; /* Counts of elements */ typedef EMACS_INT Elemcount; /* Hash codes */ typedef unsigned long Hashcode; /* ------------------------ dynamic arrays ------------------- */ --------------------------------- snip ------------------------------------- 2. in lstream.h, removed duplicate declaration of Bytecount. Rewrote the comment about this type. The changed code should now look like this: --------------------------------- snip ------------------------------------- #endif /* The have been some arguments over the what the type should be that specifies a count of bytes in a data block to be written out or read in, using Lstream_read(), Lstream_write(), and related functions. Originally it was long, which worked fine; Martin "corrected" these to size_t and ssize_t on the grounds that this is theoretically cleaner and is in keeping with the C standards. Unfortunately, this practice is horribly error-prone due to design flaws in the way that mixed signed/unsigned arithmetic happens. In fact, by doing this change, Martin introduced a subtle but fatal error that caused the operation of sending large mail messages to the SMTP server under Windows to fail. By putting all values back to be signed, avoiding any signed/unsigned mixing, the bug immediately went away. The type then in use was Lstream_Data_Count, so that it be reverted cleanly if a vote came to that. Now it is Bytecount. Some earlier comments about why the type must be signed: This MUST BE SIGNED, since it also is used in functions that return the number of bytes actually read to or written from in an operation, and these functions can return -1 to signal error. Note that the standard Unix read() and write() functions define the count going in as a size_t, which is UNSIGNED, and the count going out as an ssize_t, which is SIGNED. This is a horrible design flaw. Not only is it highly likely to lead to logic errors when a -1 gets interpreted as a large positive number, but operations are bound to fail in all sorts of horrible ways when a number in the upper-half of the size_t range is passed in -- this number is unrepresentable as an ssize_t, so code that checks to see how many bytes are actually written (which is mandatory if you are dealing with certain types of devices) will get completely screwed up. --ben */ typedef enum lstream_buffering --------------------------------- snip ------------------------------------- 3. in dumper.c, there are four places, all inside of switch() statements, where XD_BYTECOUNT appears twice as a case tag. In each case, the two case blocks contain identical code, and you should *REMOVE THE SECOND* and leave the first.

#! /bin/sh
# emacs-fe --- front end driver for `emacs' and other programs

# Copyright (C) 1995, 1996 Noah S. Friedman

# Author: Noah Friedman <friedman@prep.ai.mit.edu>
# Created: 1995-09-11

# $.Id: emacs-fe,v 1.8 1996/03/07 04:32:33 friedman Exp $

# This program 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.
#
# This program 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 this program; if not, you can either send email to this
# program's maintainer or write to: The Free Software Foundation,
# Inc.; 59 Temple Place, Suite 330; Boston, MA 02111-1307, USA.

# Commentary:

# Inspired by a similar set of scripts by Charles Sandel <sandel@cli.com>,
# but generalized into this single script.

# Front-end shell script for GNU Emacs, used to manage multiple versions of
# Emacs and its associated utilities.
#
# Strategy: Install this script as "$prefix/bin/[progname]", for each
# program named [progname], (e.g. "emacs", "ispell", "etags", etc).  These
# are the commands users would normally execute to run them.

# Give each version of emacs/xemacs/mule/ispell a separate hierarchy under
# $prefix/[emacs|xemacs|mule|ispell], with the name
# "[emacs|xemacs|mule|ispell]-NN.NN" where NN.NN is the version number.
# This script looks at what versions are available, and selects a version,
# currently whatever is specified by $DEFAULTLVERSION.

# However, users can specify their own choice to force the selection of a
# particular version by setting the environment variable PROGNAMEVERSION
# (e.g. EMACSVERSION, MULEVERSION, XEMACSVERSION, etc.) to have a value
# which is the version number of the program that they want to use (just
# the numeric value), or to specify either the NEWEST or OLDEST versions.

# Code:

# Name by which this script was invoked.
progname=`echo "$0" | sed -e 's/[^\/]*\///g'`

# To prevent hairy quoting and escaping later.
bq='`'
eq="'"

case "$progname" in
  emacs-fe-print )
    case $# in
      1 ) : ;;
      * )
        echo "$progname: Exactly one argument is required." 1>&2
        exit 1
       ;;
    esac

    # sed is more portable than `dirname'
    dir=`echo "$0" | sed -e 's/\/*$//' -e 's/\/[^\/]*$//'`
    if test -f "$dir/$1"; then
      EMACS_FE_PRINT=t
      export EMACS_FE_PRINT
      exec "$dir/$1"
    fi

    echo "$progname: $bq$dir/$1$eq does not seem to exist." 1>&2
    exit 1
  ;;
esac

DEFAULTVERSION="${DEFAULTVERSION-NEWEST}"
VARIANT="${EMACSVARIANT-emacs}"

if [ "$prefix" = "" ] ; then
  # root of the GNU installed tree
  prefix=/usr/local/gnu
fi

if [ ! -d "$prefix" ] ; then
  echo "Cannot find root of GNU tree ($prefix)."
  exit 1
fi

case "$progname" in
  emacs | lemacs | xemacs | mule | ispell )
    if [ "$eprefix" = "" ] ; then
      # prefix name of the subdirectory
      eprefix="${progname}/${progname}-"
    fi
   ;;
  * )
    eprefix="$VARIANT/${VARIANT}-"
   ;;
esac

# Find out which versions are available on the system and sort them
# in numeric order.
#
# The largish sed script prefixes all version numbers with a sort key.
# That key is constructed by padding out any single or double digits to 3
# digits from the version number, then converting all occurrences of `.' to
# `0', and prefixing and suffixing the entire result with an additional
# zero.  After sorting, the sort key is stripped from the output.
# We do all this because `sort' cannot numerically sort decimal numbers and
# will stop on the first `.'.
# This may not work correctly if the version number has more than 4 levels
# of minor versions (e.g. "1.2.3.4.5" may cause problems).
availversions=`ls -1d $prefix/${eprefix}*/. 2> /dev/null \
                | sed -n \
                      -e "s#^$prefix/$eprefix\([0-9.][0-9.]*\)/\.*#\1#" \
                      -e 'h
                          s/[^.]*[^0-9.][^.]*\.//g
                          :0
                          /[0-9.][0-9.]*\.[0-9.][0-9.]*\.[0-9.][0-9.]*\.[0-9.][0-9.]*/!{
                            s/$/.0/
                            b 0
                          }
                          s/^/./
                          s/$/./
                          :1
                          s/\.\([0-9]\)\./.00\1./g
                          s/\.\([0-9][0-9]\)\./.0\1./g
                          t 1
                          s/\./0/g
                          G
                          s/\n/ /' \
                       -e 'p' \
                 | sort -nu \
                 | sed -e 's/.* //'`

if [ "$availversions" = "" ] ; then
	echo "No version of $progname found in $prefix/$eprefix*."
	exit 1
fi

# This sets `oldest' to the oldest version available, and `newest'
# to the newest version available.
# On line 1, we save the original pattern in the hold space and restore it
# in case it is the only line of input.
eval `echo "$availversions" \
       | sed -ne '1{h;s/^/oldest=/p;g;}
                  ${s/^/newest=/p;}
                 '`

# The environment variable [progname]VERSION can have a value which specifies
# a version number, OR it can contain the values "NEWEST" or "OLDEST" to
# specify the newest or oldest version which was found.
sed_upcase='y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'

PROGNAME=`echo "$progname" | sed -e "$sed_upcase" -e 's/-/_/g'`
eval version=\"\$${PROGNAME}VERSION\"

# If there is no ETAGSVERSION, EMACSCLIENTVERSION, etc, then look for
# EMACSVERSION, XEMACSVERSION, or whatever the current variant is.
case "$version" in
  '' )
    case "$progname" in
      ispell )
        # If this is ispell and ISPELLVERSION isn't set, just use 3.1.
        # We could run this script recursively with a flag indicating to
        # find the current emacs variant and version and just print it out,
        # but that is a very pathological case and is a lot of work.
        version=3.1 ;;
      * )
        variant=`echo "$VARIANT" | sed -e "$sed_upcase"`
        eval version=\"\$${variant}VERSION\"
        case "$version" in
          '' ) version="$DEFAULTVERSION" ;;
        esac
       ;;
    esac
esac

case "$version" in
  [Oo][Ll][Dd][Ee][Ss][Tt]) version="$oldest" ;;
  [Nn][Ee][Ww][Ee][Ss][Tt]) version="$newest" ;;
  '') version="$oldest" ;;
  *)
    if [ ! -d "$prefix/$eprefix$version" ] ;  then
      echo "$progname: $version: Cannot find requested version." 1>&2
      version=
    fi
   ;;
esac

# If we don't have a version by now, then give up.
if [ "$version" = "" ] ; then
  exec 1>&2
  echo "$progname: Cannot determine which version to use."
  case "$availversions" in
    */* )
      echo "Available versions are:"
      for f in $availversions; do
        echo "   $f"
      done | sort
     ;;
    * )
      echo "Available versions are:" $availversions
     ;;
  esac
  exit 1
fi

case "$progname" in
  emacs | lemacs | xemacs | mule )
    EMACSVARIANT=$progname
    eval ${PROGNAME}VERSION=$version
    eval export EMACSVARIANT ${PROGNAME}VERSION

    case "$EMACSVARIANT-$version" in
      emacs-18* )       ISPELLVERSION=4.0    ;;
      emacs-19.[0-9] )  ISPELLVERSION=4.0    ;;
      emacs-19.1[0-9] ) ISPELLVERSION=4.0    ;;
      emacs-19.2[0-2] ) ISPELLVERSION=4.0    ;;
      emacs-19.2[3-9] ) ISPELLVERSION=3.1    ;;
      emacs-* )         ISPELLVERSION=3.1    ;;

      lemacs-19.[0-9] )	ISPELLVERSION=3.0.09 ;;
      lemacs-19.10 )	ISPELLVERSION=3.1    ;;

      xemacs-* )	ISPELLVERSION=3.1    ;;

      mule-* )          ISPELLVERSION=3.1    ;;
    esac
    export ISPELLVERSION
   ;;
esac

case "$progname" in
  xemacs )
    # xemacs expects to use the keysym database in /usr/openwin, but that
    # database doesn't define many of the keysyms it uses.  Unless the user
    # has already defined their own, specify the keysym database in X11.
    XKEYSYMDB="${XKEYSYMDB-/usr/local/X11/lib/X11/XKeysymDB}"
    export XKEYSYMDB

    # Some versions of xemacs (e.g. 19.12) are dynamically linked against
    # the openwin tooltalk library (libtt.so), so add openwin to the
    # dynamic load path if necessary.
    case "$LD_LIBRARY_PATH" in
       *'/usr/openwin/lib'* ) : ;;
       '' )
         LD_LIBRARY_PATH=/usr/local/X11R5/lib:/usr/openwin/lib:/lib
         export LD_LIBRARY_PATH
        ;;
       * )
         LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/openwin/lib"
         export LD_LIBRARY_PATH
        ;;
    esac
 ;;
esac

# Set up the MANPATH so that the man pages for this version
# are searched first
if [ -d $prefix/$eprefix$version/man ] ; then
  MANPATH=$prefix/$eprefix$version/man:$MANPATH
  export MANPATH
fi

# There is no need to do this, and it can potentially cause problems,
# especially if a program like `xemacs' exists in that directory and gets
# run in subshells instead of this script.
#PATH=$prefix/$eprefix$version/bin:$PATH
#export PATH

searchdirs=`exec 2> /dev/null
            cd $prefix/$eprefix$version \
            && find bin \
                    libexec/$VARIANT/$version/* \
                    lib/$VARIANT/$version/* \
                    lib/$VARIANT-$version/* \
                    lib/$VARIANT/etc \
                    lib/etc \
                 -type d -print`

for dir in $searchdirs ; do
  for p in $progname-$version $progname ; do
    prog="$prefix/$eprefix$version/$dir/$p"

    if test -f "$prog" ; then
      case "${EMACS_FE_PRINT+set}" in
        set )
          echo "$prog"
          exit 0
         ;;
      esac

      exec "$prog" ${1+"$@"}
    fi
  done
done

exec 1>&2

echo "$progname: Cannot find $bq$progname-$version$eq or $bq$progname$eq in"

for d in $searchdirs ; do
  ls -1d $prefix/$eprefix$version/$d 2> /dev/null \
   | sed -e "s/^/$progname:   /"
done

exit 1

# emacs-fe ends here