Hey Fumiyasu, On Wed, Jun 03, 2009 at 11:04:56PM +0900, SATOH Fumiyasu wrote: > $ dpkg -l libc6 bash > ... > ii bash 3.2-5 The GNU Bourne Again SHell > ii libc6 2.9-13 GNU C Library: Shared libraries > $ mkdir tmp > $ cd tmp > $ touch a b c x y z A B C X Y Z > $ LC_ALL=C /bin/bash --noprofile --norc -c 'echo [A-Z]' > A B C X Y Z > $ LC_ALL=ja_JP.UTF-8 /bin/bash --noprofile --norc -c 'echo [A-Z]' > A B C X Y Z > $ LC_ALL=en_US.UTF-8 /bin/bash --noprofile --norc -c 'echo [A-Z]' > A b B c C x X y Y z Z
This behavior seems quite dangerous to me: the command “rm [A-Z]*” could
remove more than just files starting with an uppercase letter, which
most people probably would not expect.
The root of this issue is in bash-3.2/lib/glob/smatch.c:
static int rangecmp (c1, c2)
int c1, c2;
{
static char s1[2] = { ' ', '\0' };
static char s2[2] = { ' ', '\0' };
int ret;
/* Eight bits only. Period. */
c1 &= 0xFF;
c2 &= 0xFF;
if (c1 == c2)
return (0);
s1[0] = c1;
s2[0] = c2;
if ((ret = strcoll (s1, s2)) != 0)
return ret;
return (c1 - c2);
}
This function uses the strcoll() function which is similar to strcmp()
but “compares two strings using the current locale”. This allows things
like
$ touch ö
$ echo [o-p]
ö
to work and also causes the problem you described. Interestingly, the
POSIX specification permits this:
7. In the POSIX locale, a range expression represents the set of
collating elements that fall between two elements in the collation
sequence, inclusive. In other locales, a range expression has
unspecified behavior: strictly conforming applications shall not
rely on whether the range expression is valid, or on the set of
collating elements matched.
–
http://www.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_03_05
So, the bash maintainers may decide to use -DUSE_POSIX_GLOB_LIBRARY
(which is deprecated according to
http://lists.gnu.org/archive/html/bug-bash/2001-02/msg00032.html), patch
away the usage of strcoll, or leave everything as it is.
All the best,
--
Michael Schutte <[email protected]>
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