Bug#218931: SEVERE bug with ctype (isxdigit and co) in libc6 ds1-8 and ds1-9 (Sid) on i386

[David Decotigny]

Package: libc6
Version: 2.3.2.ds1-9
(Note that I also tried the 2.3.2.ds1-8 with the same results as below).

I should also mention:
Package: libc6-dev
Version: 2.3.2.ds1-9
I apt-get dist-upgrade today my Sid (did it 10 days ago and it was still fine 
at that time I guess). Now, the libc6 headers seem to be inconsistent with the 
__ctype variable in the libc6 shared library and archive, or the __ctype 
variable (in libc6 library) itself is broken. This causes the isxdigit() (at 
least) function to behave incorrectly:

isxdigit('0') = 0
isxdigit('1') = 0
...
isxdigit('9') = 0
isxdigit('a') = 0
...
isxdigit('f') = 0
isxdigit('A') = 0
...
isxdigit('F') = 0
isxdigit('q') = 0
isxdigit('s') = 0
isxdigit('d') = 0
isxdigit('z') = 0
...
The source to get this was :

#include <ctype.h>
#include <stdio.h>
int main ()
{
  char *p;
  for (p = "0123456789abcdefABCDEFqsdzabcdef" ; *p != '\0'; p++)
     printf("isxdigit('%c') = %d\n", *p, isxdigit(*p));
  return 0;
}
(compiled with gcc-2.95 and gcc of the current gcc of the Sid, with shared 
version of the libc6, and static version)

Other informations:
$ cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 4
model name      : AMD Athlon(tm) Processor
stepping        : 2
cpu MHz         : 807.207
cache size      : 256 KB
...
$ uname -a
Linux baloo 2.4.22 #2 mar ao� 26 23:26:24 CEST 2003 i686 GNU/Linux
$ gcc --version
gcc (GCC) 3.3.2 (Debian)
$ gcc-2.95 --version
2.95.4
$ echo $LC_ALL
[EMAIL PROTECTED]
Please note that I get the same behaviour with LC_ALL unset !

Suggestion:
When I look in the libc6 headers, I get :
  _ISxdigit = (1 << ( 4 ))
and :
  isxdigit(c) expanded to (according to gcc -E -DM) :
  (((__ctype_b) )[(int) ( ( c ) )] & (__ctype_mask_t)   _ISxdigit
And, by looking the value of __ctype for '1' for example :
  __ctype['1'] = 0xd808 (ie 1101100000001000 in base 2)
which means that the following bits are set :
  3 (ie _ISdigit)
  11 (ie _ISalnum)
  12 (ie ????)
  14 (ie ????)
  15 (ie ????)
AND NOT the _ISxdigit bit !
Idem for __ctype['a'] = 0xd608 (ie 1101011000001000 in base 2), with the 
following bits set:
  3 (ie _ISdigit)
  9 (ie _IScntrl)
  10 (ie _ISpunct)
  12 (ie ????)
  14 (ie ????)
  15 (ie ????)
Which looks completely broken !!!

So: what is wrong ? The ctype.h header ? Or the libc6.so and libc6.a libraries 
? Or both ?

Please help !... The linux kernel won't compile anymore because of this 
(cannot correctly generate drivers/char/consolemap_deftbl.c because isxdigit 
is broken in drivers/char/conmakehash.c).

Thanks.

--
David Decotigny -- http://david.decotigny.free.fr


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