5:53 a.m.
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Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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6:05 a.m.
Richard W.M. Jones wrote:
Subject: [PATCH] guestfish: Use xstrtol to parse integers
(RHBZ#557655).
Current code uses atoi to parse the generator Int type and
atoll to parse the generator Int64 type. The problem with the
ato* functions is that they don't cope with errors very well,
and they cannot parse numbers that begin with 0.. or 0x..
for octal and hexadecimal respectively.
This replaces the atoi call with a call to Gnulib xstrtol
and the atoll call with a call to Gnulib xstrtoll.
The generated code looks like this for all Int arguments:
looks fine.
...
and like this for all Int64 arguments (note we don't need the
range check for these):
...
looks fine, too.
diff --git a/.gitignore b/.gitignore
...
diff --git a/fish/guestfish.pod b/fish/guestfish.pod
...
+=head1 NUMBERS
+
+Commands which take integers as parameters use the C convention which
+is to use C<0> to prefix an octal number or C<0x> to prefix a
+hexadecimal number. For example:
+
+ 1234 decimal number 1234
+ 02322 octal number, equivalent to decimal 1234
+ 0x4d2 hexadecimal number, equivalent to decimal 1234
+
+When using the C<chmod> command, you almost always want to specify an
+octal number for the mode, and you must prefix it with C<0> (unlike
+the Unix L<chmod(1)> program):
+
+ chmod 0777 /public # OK
+ chmod 777 /public # WRONG! This is mode 777 decimal = 01411 octal.
This strikes me as surprising enough that it would deserve
to emit a warning when there is no leading 0.
Doing anything else seems like just asking for trouble.
...
Good test coverage.
The rest looked fine, too.
6:14 a.m.
New subject: [PATCH version 2] guestfish: Use xstrtol to parse integers (RHBZ#557655).
On Mon, Jan 25, 2010 at 01:05:32PM +0100, Jim Meyering wrote:
Richard W.M. Jones wrote:
> + chmod 0777 /public # OK
> + chmod 777 /public # WRONG! This is mode 777 decimal = 01411 octal.
This strikes me as surprising enough that it would deserve
to emit a warning when there is no leading 0.
Doing anything else seems like just asking for trouble.
There's a limit to what we can do here. We would have to mark this
parameter in a special way in the generator (not 'Int' but
'Int_that_usually_needs_octal_in_guestfish').
While I now think it was a bad idea to use plain types like 'Int' and
'String' in the generator (you live and learn, but this is why we
replaced many uses of 'String' with 'Pathname', 'Device' etc),
changing this is quite involved for little gain. And what happens if
people do want to use decimal modes, eg. if they are generating
guestfish scripts. It is also now documented.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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6:19 a.m.
New subject: [PATCH version 2] guestfish: Use xstrtol to parse integers (RHBZ#557655).
Richard W.M. Jones wrote:
On Mon, Jan 25, 2010 at 01:05:32PM +0100, Jim Meyering wrote:
> Richard W.M. Jones wrote:
> > + chmod 0777 /public # OK
> > + chmod 777 /public # WRONG! This is mode 777 decimal = 01411 octal.
>
> This strikes me as surprising enough that it would deserve
> to emit a warning when there is no leading 0.
> Doing anything else seems like just asking for trouble.
There's a limit to what we can do here. We would have to mark this
parameter in a special way in the generator (not 'Int' but
'Int_that_usually_needs_octal_in_guestfish').
While I now think it was a bad idea to use plain types like 'Int' and
'String' in the generator (you live and learn, but this is why we
replaced many uses of 'String' with 'Pathname', 'Device' etc),
Yes, I remember well ;)
changing this is quite involved for little gain. And what happens
if
people do want to use decimal modes, eg. if they are generating
guestfish scripts. It is also now documented.
I agree that it's probably not worth the effort.
6:10 a.m.
New subject: [PATCH version 3] guestfish: Use xstrtol to parse integers (RHBZ#557655).
Updated again, includes a fix suggested by Jim Meyering, and another
fix to handling of fwrite.
Rich.
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Richard W.M. Jones