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Re: Emacs .gdbinit incompatible with latest GDB

From: Eli Zaretskii
Subject: Re: Emacs .gdbinit incompatible with latest GDB
Date: Sun, 25 Feb 2007 23:23:58 +0200

> From: Nick Roberts <address@hidden>
> Date: Mon, 26 Feb 2007 10:10:43 +1300
> Cc: address@hidden
>  > 
>  >     1) Why was this change made?
>  > 
>  > Probably to make it easier to avoid incorrect conversions when
>  > extracting elements.  We don't want to get negative numbers
>  > for byte values above 127.
> Yes, that bit is self-evident but when are eight bit strings needed?
> Mathieu Lacage stated on gdb-patches:
>                                            ....a lot of people (the first
>   which comes to my mind is libxml2) decided to use "unsigned char *" to
>   identify utf-8 encoded strings in C.
> Would this also be the case for Emacs?

No, Emacs never uses utf-8 in Lisp strings (at least not in Emacs 22
and earlier).  However, the emacs-mule internal encoding of characters
stores 8-bit bytes for some codepoints (see the commentary in coding.c
for details).  I think byte code is also sometimes held in strings,
and can include bytes with the 8th bit set.

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