[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.

;;; find-paths.el --- setup various XEmacs paths

;; Copyright (C) 1985-1986, 1990, 1992-1997 Free Software Foundation, Inc.
;; Copyright (c) 1993, 1994 Sun Microsystems, Inc.
;; Copyright (C) 1995 Board of Trustees, University of Illinois

;; Author: Mike Sperber <sperber@informatik.uni-tuebingen.de>
;; Maintainer: XEmacs Development Team
;; Keywords: internal, dumped

;; This file is part of XEmacs.

;; XEmacs 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.

;; XEmacs 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, 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Synched up with: Not in FSF.

;;; Commentary:

;; This file is dumped with XEmacs.

;; This file contains the library functionality to find paths into the
;; XEmacs hierarchy.

;;; Code:

(defvar paths-version-control-filename-regexp
  "^\\(RCS\\|CVS\\|SCCS\\)$"
  "File bases associated with version control.")

(defvar paths-lisp-filename-regexp
  "^\\(.*\\.elc?\\)$"
  "File bases that contain Lisp file.")

(defvar paths-no-lisp-directory-regexp
  (concat "\\(" paths-version-control-filename-regexp "\\)"
	  "\\|"
	  "\\(" paths-lisp-filename-regexp "\\)")
  "File bases that may not be directories containing Lisp code.")

(defun paths-find-recursive-path (directories &optional max-depth exclude-regexp)
  "Return a list of the directory hierarchy underneath DIRECTORIES.
The returned list is sorted by pre-order and lexicographically.
MAX-DEPTH limits the depth of the search to MAX-DEPTH level,
if it is a number.  If MAX-DEPTH is NIL, the search depth is unlimited.
EXCLUDE-REGEXP is a regexp that matches directory names to exclude
from the search."
  (let ((path '()))
    (while directories
      (let ((directory (file-name-as-directory
			(expand-file-name
			 (car directories)))))
	(if (paths-file-readable-directory-p directory)
	    (let ((raw-entries
		   (if (equal 0 max-depth)
		       '()
		     (directory-files directory nil "^[^.-]")))
		  (reverse-dirs '()))
	      (while raw-entries
		(if (not (and exclude-regexp
			      (string-match exclude-regexp (car raw-entries))))
		    (setq reverse-dirs
			  (cons (expand-file-name (car raw-entries) directory)
				reverse-dirs)))
		(setq raw-entries (cdr raw-entries)))

	      (let ((sub-path
		     (paths-find-recursive-path (reverse reverse-dirs)
						(if (numberp max-depth)
						    (- max-depth 1)
						  max-depth)
						exclude-regexp)))
		(setq path (nconc path
				  (list directory)
				  sub-path))))))
      (setq directories (cdr directories)))
    path))

(defun paths-file-readable-directory-p (filename)
  "Check if filename is a readable directory."
  (and (file-directory-p filename)
       (file-readable-p filename)))

(defun paths-find-recursive-load-path (directories &optional max-depth)
  "Construct a recursive load path underneath DIRECTORIES."
  (paths-find-recursive-path directories
			     max-depth paths-no-lisp-directory-regexp))

(defun paths-emacs-root-p (directory)
  "Check if DIRECTORY is a plausible installation root for XEmacs."
  (or
   ;; installed
   (paths-file-readable-directory-p (paths-construct-path (list directory
								"lib"
								emacs-program-name)))
   ;; in-place or windows-nt
   (and
    (paths-file-readable-directory-p (paths-construct-path (list directory "lisp")))
    (paths-file-readable-directory-p (paths-construct-path (list directory "etc"))))))

(defun paths-root-in-place-p (root)
  "Check if ROOT is an in-place installation root for XEmacs."
  (paths-file-readable-directory-p (paths-construct-path (list root "lisp"))))

(defun paths-chase-symlink (file-name)
  "Chase a symlink until the bitter end."
      (let ((maybe-symlink (file-symlink-p file-name)))
	(if maybe-symlink
	    (let* ((directory (file-name-directory file-name))
		   (destination (expand-file-name maybe-symlink directory)))
	      (paths-chase-symlink destination))
	  file-name)))

(defun paths-find-emacs-root
  (invocation-directory invocation-name)
  "Find the run-time root of XEmacs."
  (let* ((executable-file-name (paths-chase-symlink
				(concat invocation-directory
					invocation-name)))
	 (executable-directory (file-name-directory executable-file-name))
	 (maybe-root-1 (file-name-as-directory
			(paths-construct-path '("..") executable-directory)))
	 (maybe-root-2 (file-name-as-directory
			(paths-construct-path '(".." "..") executable-directory))))
    (or (and (paths-emacs-root-p maybe-root-1)
	     maybe-root-1)
	(and (paths-emacs-root-p maybe-root-2)
	     maybe-root-2))))

(defun paths-construct-path (components &optional expand-directory)
  "Convert list of path components COMPONENTS into a path.
If EXPAND-DIRECTORY is non-NIL, use it as a directory to feed
to EXPAND-FILE-NAME."
  (let* ((reverse-components (reverse components))
	 (last-component (car reverse-components))
	 (first-components (reverse (cdr reverse-components)))
	 (path
	  (apply #'concat
		 (append (mapcar #'file-name-as-directory first-components)
			 (list last-component)))))
    (if expand-directory
	(expand-file-name path expand-directory)
      path)))

(defun paths-construct-emacs-directory (root suffix base)
  "Construct a directory name within the XEmacs hierarchy."
  (file-name-as-directory
   (expand-file-name
    (concat
     (file-name-as-directory root)
     suffix
     base))))

(defun paths-find-emacs-directory (roots suffix base
				   &optional envvar default keep-suffix
				   	     in-place-external)
  "Find a directory in the XEmacs hierarchy.
ROOTS must be a list of installation roots.
SUFFIX is the subdirectory from there.
BASE is the base to look for.
ENVVAR is the name of the environment variable that might also
specify the directory.
DEFAULT is the preferred value.
If KEEP-SUFFIX is non-nil, the suffix must be respected in searching
the directory.
If IN-PLACE-EXTERNAL is non-nil, the directory might be found outside
an in-place root-hierarchy."
  (let ((preferred-value (or (and envvar (getenv envvar))
			     default)))
    (if (and preferred-value
	     (paths-file-readable-directory-p preferred-value))
	(file-name-as-directory preferred-value)
      (catch 'gotcha
	(while roots
	  (let ((root (car roots)))
	    ;; installed
	    (let ((path (paths-construct-emacs-directory root suffix base)))
	      (if (paths-file-readable-directory-p path)
		  (throw 'gotcha path)))
	    ;; in-place
	    (if (null keep-suffix)
		(let ((path (paths-construct-emacs-directory root "" base)))
		  (if (paths-file-readable-directory-p path)
		      (throw 'gotcha path))))
	    (if (and in-place-external
		     (paths-root-in-place-p root))
		(let ((path (paths-construct-emacs-directory
			     (paths-construct-path '("..") root)
			     "" base)))
		  (if (paths-file-readable-directory-p path)
		      (throw 'gotcha path)))))
	  (setq roots (cdr roots)))
	nil))))

(defun paths-find-site-directory (roots base &optional envvar default in-place-external)
  "Find a site-specific directory in the XEmacs hierarchy.
If IN-PLACE-EXTERNAL is non-nil, the directory might be found outside
an in-place root-hierarchy."
  (paths-find-emacs-directory roots
			      (file-name-as-directory
			       (paths-construct-path (list
						      "lib"
						      emacs-program-name)))
			      base
			      envvar default
			      nil
			      in-place-external))

(defun paths-find-version-directory (roots base
				     &optional envvar default enforce-version)
  "Find a version-specific directory in the XEmacs hierarchy.
If ENFORCE-VERSION is non-nil, the directory must contain the XEmacs version."
  (paths-find-emacs-directory roots
			      (file-name-as-directory
			       (paths-construct-path
				(list "lib"
				      (construct-emacs-version-name))))
			      base
			      envvar default
			      enforce-version))

(defun paths-find-architecture-directory (roots base &optional envvar default)
  "Find an architecture-specific directory in the XEmacs hierarchy."
  (or
   ;; from more to less specific
   (paths-find-version-directory roots
				 (concat base system-configuration)
				 envvar default)
   (paths-find-version-directory roots
				 base
				 envvar)
   (paths-find-version-directory roots
				 system-configuration
				 envvar)))

(defun construct-emacs-version-name ()
  "Construct the raw XEmacs version number."
  (concat emacs-program-name "-" emacs-program-version))

(defun paths-directories-which-exist (directories)
  "Return the directories among DIRECTORIES."
  (let ((reverse-directories '()))
    (while directories
      (if (paths-file-readable-directory-p (car directories))
	  (setq reverse-directories
		(cons (car directories)
		      reverse-directories)))
      (setq directories (cdr directories)))
    (reverse reverse-directories)))

(defun paths-uniq-append (list-1 list-2)
  "Append LIST-1 and LIST-2, omitting duplicates."
  (let ((reverse-survivors '()))
    (while list-2
      (if (null (member (car list-2) list-1))
	  (setq reverse-survivors (cons (car list-2) reverse-survivors)))
      (setq list-2 (cdr list-2)))
    (append list-1
	    (reverse reverse-survivors))))

(defun paths-filter (predicate list)
  "Delete all matches of PREDICATE from LIST."
  (let ((reverse-result '()))
    (while list
      (if (funcall predicate (car list))
	  (setq reverse-result (cons (car list) reverse-result)))
      (setq list (cdr list)))
    (nreverse reverse-result)))

(defun paths-decode-directory-path (string &optional drop-empties)
  "Split STRING at path separators into a directory list.
Non-\"\" components are converted into directory form.
If DROP-EMPTIES is non-NIL, \"\" components are dropped from the output.
Otherwise, they are left alone."
  (let* ((components (split-path string))
	 (directories
	  (mapcar #'(lambda (component)
		      (if (string-equal "" component)
			  component
			(file-name-as-directory component)))
		  components)))
    (if drop-empties
	(paths-filter #'(lambda (component)
			  (null (string-equal "" component)))
		      directories)
      directories)))

(defun paths-find-emacs-roots (invocation-directory
			       invocation-name)
  "Find all plausible installation roots for XEmacs."
  (let* ((potential-invocation-root
	  (paths-find-emacs-root invocation-directory invocation-name))
	 (invocation-roots
	  (and potential-invocation-root
	       (list potential-invocation-root)))
	 (potential-installation-roots
	  (paths-uniq-append
	   (and configure-exec-prefix-directory
		(list (file-name-as-directory
		       configure-exec-prefix-directory)))
	   (and configure-prefix-directory
		(list (file-name-as-directory
		       configure-prefix-directory)))))
	 (installation-roots
	  (paths-filter #'paths-emacs-root-p potential-installation-roots)))
    (paths-uniq-append invocation-roots
		       installation-roots)))

;;; find-paths.el ends here