[Bug 1002110] New: vfscanf does not support "hh" conversion

[Bug 1002110] New: vfscanf does not support "hh" conversion

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            Bug ID: 1002110
           Summary: vfscanf does not support "hh" conversion
           Product: eCos
           Version: 3.0
            Target: All
 Architecture/Host_ Other
                OS:
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: low
         Component: C library
          Assignee: unassigned@bugs.ecos.sourceware.org
          Reporter: 414256we@gmail.com
        QA Contact: ecos-bugs@ecos.sourceware.org
                CC: ecos-bugs@ecos.sourceware.org

While the standard said:
h      Indicates  that the conversion will be one of d, i, o, u, x, X, or n and
the next pointer is a pointer to a short int or unsigned short int
              (rather than int).

hh     As for h, but the next pointer is a pointer to a signed char or unsigned
char.
The C library in eCos implements as follow:
again:
c = *fmt++
switch (c) {
...
case 'h':
        flags |= SHORT;
        goto again;
...
}
it results that it treat "hh" as "h". 
When we try to did something like this:
unsigned char c;
sscanf(str, "%hhx", &c);
a segmentfault was generated.

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[Bug 1002110] vfscanf does not support "hh" conversion

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http://bugs.ecos.sourceware.org/show_bug.cgi?id=1002110

Lea <414256we@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|low                         |high
           Severity|enhancement                 |critical

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[Bug 1002110] vfscanf does not support "hh" conversion

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http://bugs.ecos.sourceware.org/show_bug.cgi?id=1002110

Jonathan Larmour <jifl@ecoscentric.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|high                        |low
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |jifl@ecoscentric.com
         Resolution|---                         |WONTFIX
           Severity|critical                    |enhancement

--- Comment #1 from Jonathan Larmour <jifl@ecoscentric.com> ---
The eCos C library was written to the ISO C 90 standard. The 'hh' size
specifier was added in the C99 standard. We do not have C99 support in this and
many other ways. So indeed %hhx would fail. Adding 'hh' support, along with
other C99 additions would be quite an enhancement, and is considered a low
priority at this time.

I suggest you use %c with the first element of a two char string (so you can
have a NULL terminator) followed by a call to strtoul() with base 16.

I'm marking this WONTFIX for now, although I'd have no problem with a tested
patch if one appeared.

Jifl

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[Bug 1002110] vfscanf does not support "hh" conversion

[bugzilla-daemon]

Please do not reply to this email, use the link below.

http://bugs.ecos.sourceware.org/show_bug.cgi?id=1002110

Jonathan Larmour <jifl@ecoscentric.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|high                        |low
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |jifl@ecoscentric.com
         Resolution|---                         |WONTFIX
           Severity|critical                    |enhancement

--- Comment #1 from Jonathan Larmour <jifl@ecoscentric.com> ---
The eCos C library was written to the ISO C 90 standard. The 'hh' size
specifier was added in the C99 standard. We do not have C99 support in this and
many other ways. So indeed %hhx would fail. Adding 'hh' support, along with
other C99 additions would be quite an enhancement, and is considered a low
priority at this time.

I suggest you use %c with the first element of a two char string (so you can
have a NULL terminator) followed by a call to strtoul() with base 16.

I'm marking this WONTFIX for now, although I'd have no problem with a tested
patch if one appeared.

Jifl

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[Bug 1002110] vfscanf does not support "hh" conversion

[bugzilla-daemon]

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http://bugs.ecos.sourceware.org/show_bug.cgi?id=1002110

Lea <414256we@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|low                         |high
           Severity|enhancement                 |critical

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