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bug#7786: 23.2; Encoding of PostScript files

From: Peter Dyballa
Subject: bug#7786: 23.2; Encoding of PostScript files
Date: Wed, 5 Jan 2011 01:18:19 +0100


When I open a PostScript file it's opened "(encoded by coding system undecided-unix)" – as the *Help* buffer explains after invocation of C- u x =.

This is incorrect, because, as PRML, The PostScript® Language Reference manual, explains in a footnote near the end, on encodings:

3. The ISOLatin1Encoding encoding vector deviates from the ISO 8859-1 standard in one respect: the character at position 140 is quoteleft, whereas the ISO standard specifies grave. A PostScript program needing to conform exactly to the ISO standard should
           create a modified encoding vector with this entry changed.

So what is displayed in the buffer as

        character: ` (96, #o140, #x60)

is in reality, printed on some medium or on screen

        character: ‘ (8216, #o20030, #x2018)

or: instead of /grave the character /quoteleft is encoded here.

IMO GNU Emacs should open a PostScript file in adobe-standard- encoding, except it sees in the file that the font(s) used is (are) re- encoded in ISOLatin1Encoding (which is *not* the same as ISO 8819-1), CE Encoding, or whatever.

In GNU Emacs 23.2.1 (powerpc-apple-darwin9.8.0, X toolkit, Xaw3d scroll bars)
 of 2010-08-01 on Latsche.local
Windowing system distributor `The X.Org Foundation', version 11.0.10903000 configured using `configure '--without-sound' '--without-dbus' '-- without-pop' '--without-gconf' '--with-x-toolkit=athena' '--x- libraries=/usr/X11/lib' '--x-includes=/usr/X11/include' '--enable- locallisppath=/Library/Application Support/Emacs/calendar23:/Library/ Application Support/Emacs' 'CFLAGS=-H -Wno-pointer-sign -pipe -fPIC - fno-common -mcpu=7450 -mtune=7450 -faltivec -fast' 'CPPFLAGS=' 'LDFLAGS=' 'CC=gcc-4.2' 'CPP=cpp-4.2''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: de_DE.UTF-8
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: de_DE.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: PostScript

Minor modes in effect:
  doc-view-minor-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t
  view-mode: t

Recent input:
<down-mouse-1> <mouse-1> C-x d <return> <escape> <
s <down> <down> <down> <down> <down> <down> <down>
<down> v <end> <escape> > <prior> <prior> M-x d e s
c r i b <tab> e n c o <tab> <backspace> <backspace>
c <tab> <backspace> <backspace> <backspace> <tab> c
h a r <tab> a <tab> <return> C-g M-x d e s c r i b
e - <tab> c o d <tab> <return> <return> <help-echo>
<prior> <prior> <prior> <prior> <prior> <prior> <next>
<next> <down> <down> <right> <right> <right> <right>
<right> <right> <right> <right> <right> <right> <right>
C-u C-x = <help-echo> <help-echo> <menu-bar> <PostScript>
<Cookbook> <ISOLatin1Extended> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <menu-bar> <help-menu> <send-emacs-bug

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Mark set
Type C-c C-c to toggle between editing or viewing the document.
View mode: type C-h for help, h for commands, q to quit.
Mark set
Making completion list...
Making completion list...
Char: ` (96, #o140, #x60) point=36185 of 39534 (92%) column=11
call-interactively: Buffer is read-only: #<buffer man_ascii.ps>

Mit friedvollen Grüßen


Üblicherweise begehen Menschen beim Entwerfen vollkommen narrensicherer Dinge gerne den Fehler, das Genie des Volltrottels zu unterschätzen.

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