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Re: Guile BUG: What's wrong with this?
From: |
Mark H Weaver |
Subject: |
Re: Guile BUG: What's wrong with this? |
Date: |
Sat, 07 Jan 2012 11:38:55 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.92 (gnu/linux) |
Bruce Korb <address@hidden> writes:
> On 01/07/12 07:00, Mark H Weaver wrote:
>> The right place to fix this would probably be in
>> `scm_i_string_start_writing' (strings.c).
>
> I think it too much effort for that function. I looked at it.
> The problem is that you'd have to pass it the start and end points,
> that is, change its interface.
Ah yes, excellent point!
Indeed, it would not be enough for `scm_i_string_start_writing' to check
for an empty string. Even for non-empty immutable strings, if the range
of character indices passed to a string mutator is empty, then no
characters will be changed, and therefore the operation should succeed.
`scm_i_string_start_writing' doesn't have enough information to detect
this case.
I see two choices:
* Modify the interface to `scm_i_string_start_writing' to give it the
`start' and `end' indices.
* Add checks to all string mutation functions: if the range is empty,
then avoid calling `scm_i_string_start_writing'.
The advantage to the first approach is that authors of future string
mutators won't have to remember to handle this case specially, and I
have very little confidence that they would.
I'll look into this.
Mark
- Re: mutable interfaces - was: Guile: What's wrong with this?, (continued)
- Re: Guile BUG: What's wrong with this?, Bruce Korb, 2012/01/06
- Re: Guile BUG: What's wrong with this?, Mark H Weaver, 2012/01/06
- Re: Guile BUG: What's wrong with this?, Andy Wingo, 2012/01/06
- Re: Guile BUG: What's wrong with this?, Bruce Korb, 2012/01/06
- Re: Guile BUG: What's wrong with this?, Mark H Weaver, 2012/01/07
- Re: Guile BUG: What's wrong with this?, Bruce Korb, 2012/01/07
- Re: Guile BUG: What's wrong with this?,
Mark H Weaver <=
- Re: Guile BUG: What's wrong with this?, Bruce Korb, 2012/01/07
- Re: Guile BUG: What's wrong with this?, Mark H Weaver, 2012/01/09
- Re: Guile BUG: What's wrong with this?, Bruce Korb, 2012/01/09
- Re: Guile BUG: What's wrong with this?, Andy Wingo, 2012/01/09
- Re: Guile BUG: What's wrong with this?, Bruce Korb, 2012/01/09
- Re: Guile BUG: What's wrong with this?, David Kastrup, 2012/01/07
- Re: Guile BUG: What's wrong with this?, Mark H Weaver, 2012/01/07
- Re: Guile BUG: What's wrong with this?, Mark H Weaver, 2012/01/07
- Re: Guile BUG: What's wrong with this?, Mike Gran, 2012/01/07
- Re: Guile BUG: What's wrong with this?, Ludovic Courtès, 2012/01/07