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Re: [PATCH] Improved string writing

From: Marius Vollmer
Subject: Re: [PATCH] Improved string writing
Date: Thu, 09 Jun 2005 20:50:30 +0300
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

address@hidden (Ludovic Courtès) writes:

> Marius Vollmer <address@hidden> writes:
>> Here is a patch for what I have in mind.  I have applied it already.
> Just a note: it seems that the line
>> +                  data = scm_i_string_chars (exp);
> appears twice within the loop but is not needed.

This is actually needed with the new string representation.  See

   Internal, low level interface to the character arrays

   - Use scm_i_string_chars to get a pointer to the byte array of a
     string for reading.  Use scm_i_string_length to get the number of
     bytes in that array.  The array is not null-terminated.

   - The array is valid as long as the corresponding SCM object is
     protected but only until the next SCM_TICK.  During such a 'safe
     point', strings might change their representation.

The call to scm_lfwrite might do anything since the port might be a
softport, for example.  Thus, we need to call scm_i_string_chars again
after each such call.

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