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Are port-column and port-line maintained by writes?
From: |
Matthias Koeppe |
Subject: |
Are port-column and port-line maintained by writes? |
Date: |
14 May 2001 19:02:57 +0200 |
User-agent: |
Gnus/5.0808 (Gnus v5.8.8) Emacs/20.6 |
It seems to me that the current column and line of a port are not
updated by write operations; `port-column' and `port-line' always seem
to return 0. This is not documented anywhere; if column and line are
not known, #f should be returned instead.
I would prefer having a useful implementation of these functions
available, though. I suppose one would need to change `scm_lfwrite'
and/or `scm_c_write' to check for control characters; but I am not
sure about the differences between these two functions. Can somebody
explain them to me?
(I was trying to fix the repl, so that the prompt always starts with a
fresh line, and to fix the ~& format directive to work with port
columns. But I need `port-column' and `port-line' working for that.)
--
Matthias Köppe -- http://www.math.uni-magdeburg.de/~mkoeppe
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