>--[Christian Biere]--<[EMAIL PROTECTED]>
> R�diger Kuhlmann wrote:
> > > I assume this is no different from gettext() but GCC "trusts" the latter
> > > to not mess with format strings.
> > The "trust" is in no way different from checking format strings at all,
> > i.e., a simple __attribute__() thing,
> Which one?
Checking /usr/include/glib-2.0/glib/gmacros.h from libglib2.0-dev 2.4.8-1, I
can't find a glib macro for it. /usr/include/libintl.h from libc6-dev
2.3.2.ds1-20 uses this declaration:
extern char *ngettext (__const char *__msgid1, __const char *__msgid2,
unsigned long int __n)
__THROW __attribute_format_arg__ (1) __attribute_format_arg__ (2);
where __attribute_format_arg__ is defined in /usr/include/sys/cdefs.h
(included through /usr/include/features.h) as:
#if __GNUC_PREREQ (2,8)
# define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
#else
# define __attribute_format_arg__(x) /* Ignore */
#endif
Here's the documentation according to <info:/gcc-3.3/Function Attributes>:
`format_arg (STRING-INDEX)'
The `format_arg' attribute specifies that a function takes a format
string for a `printf', `scanf', `strftime' or `strfmon' style
function and modifies it (for example, to translate it into
another language), so the result can be passed to a `printf',
`scanf', `strftime' or `strfmon' style function (with the
remaining arguments to the format function the same as they would
have been for the unmodified string). For example, the
declaration:
extern char *
my_dgettext (char *my_domain, const char *my_format)
__attribute__ ((format_arg (2)));
causes the compiler to check the arguments in calls to a `printf',
`scanf', `strftime' or `strfmon' type function, whose format
string argument is a call to the `my_dgettext' function, for
consistency with the format string argument `my_format'. If the
`format_arg' attribute had not been specified, all the compiler
could tell in such calls to format functions would be that the
format string argument is not constant; this would generate a
warning when `-Wformat-nonliteral' is used, but the calls could
not be checked without the attribute.
The parameter STRING-INDEX specifies which argument is the format
string argument (starting from one). Since non-static C++ methods
have an implicit `this' argument, the arguments of such methods
should be counted from two.
The `format-arg' attribute allows you to identify your own
functions which modify format strings, so that GCC can check the
calls to `printf', `scanf', `strftime' or `strfmon' type function
whose operands are a call to one of your own function. The
compiler always treats `gettext', `dgettext', and `dcgettext' in
this manner except when strict ISO C support is requested by
`-ansi' or an appropriate `-std' option, or `-ffreestanding' is
used. Options Controlling C Dialect C Dialect Options.
Not particularly hard to find, is it?
--
"See, free nations are peaceful nations. Free nations don't attack
each other. Free nations don't develop weapons of mass destruction."
- George W. Bush, Milwaukee, Wis., Oct. 3, 2003
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