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2004-03-01 David Zeuthen <david@fubar.dk>

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* dbus/dbus-string.c (_dbus_string_append_printf_valist): Fix a
	bug where args were used twice. This bug resulted in a segfault
	on a Debian/PPC system when starting the messagebus daemon. Include
	dbus-sysdeps.h for DBUS_VA_COPY

	* dbus/dbus-sysdeps.h: Define DBUS_VA_COPY if neccessary. From GLib

	* configure.in: Check for va_copy; define DBUS_VA_COPY to the
	appropriate va_copy implementation. From GLib
This commit is contained in:
David Zeuthen 2004-03-05 14:05:33 +00:00
parent 47d8e53bfe
commit 868dd4b4b0
4 changed files with 118 additions and 4 deletions
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12
ChangeLog
View file

@ -1,3 +1,15 @@
2004-03-01 David Zeuthen <david@fubar.dk>
* dbus/dbus-string.c (_dbus_string_append_printf_valist): Fix a
bug where args were used twice. This bug resulted in a segfault
on a Debian/PPC system when starting the messagebus daemon. Include
dbus-sysdeps.h for DBUS_VA_COPY
* dbus/dbus-sysdeps.h: Define DBUS_VA_COPY if neccessary. From GLib
* configure.in: Check for va_copy; define DBUS_VA_COPY to the
appropriate va_copy implementation. From GLib
2004-02-24 Joe Shaw <joe@ximian.com>
* bus/services.c (bus_registry_acquire_service): We need to pass

76
configure.in
View file

@ -293,6 +293,82 @@ AC_SUBST(DBUS_HAVE_INT64)
## byte order
AC_C_BIGENDIAN
dnl **********************************
dnl *** va_copy checks (from GLib) ***
dnl **********************************
dnl we currently check for all three va_copy possibilities, so we get
dnl all results in config.log for bug reports.
AC_CACHE_CHECK([for an implementation of va_copy()],dbus_cv_va_copy,[
AC_LINK_IFELSE([#include <stdarg.h>
void f (int i, ...) {
va_list args1, args2;
va_start (args1, i);
va_copy (args2, args1);
if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
exit (1);
va_end (args1); va_end (args2);
}
int main() {
f (0, 42);
return 0;
}],
[dbus_cv_va_copy=yes],
[dbus_cv_va_copy=no])
])
AC_CACHE_CHECK([for an implementation of __va_copy()],dbus_cv___va_copy,[
AC_LINK_IFELSE([#include <stdarg.h>
void f (int i, ...) {
va_list args1, args2;
va_start (args1, i);
__va_copy (args2, args1);
if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
exit (1);
va_end (args1); va_end (args2);
}
int main() {
f (0, 42);
return 0;
}],
[dbus_cv___va_copy=yes],
[dbus_cv___va_copy=no])
])
if test "x$dbus_cv_va_copy" = "xyes"; then
dbus_va_copy_func=va_copy
else if test "x$dbus_cv___va_copy" = "xyes"; then
dbus_va_copy_func=__va_copy
fi
fi
if test -n "$dbus_va_copy_func"; then
AC_DEFINE_UNQUOTED(DBUS_VA_COPY,$dbus_va_copy_func,[A 'va_copy' style function])
fi
AC_CACHE_CHECK([whether va_lists can be copied by value],dbus_cv_va_val_copy,[
AC_TRY_RUN([#include <stdarg.h>
void f (int i, ...) {
va_list args1, args2;
va_start (args1, i);
args2 = args1;
if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
exit (1);
va_end (args1); va_end (args2);
}
int main() {
f (0, 42);
return 0;
}],
[dbus_cv_va_val_copy=yes],
[dbus_cv_va_val_copy=no],
[dbus_cv_va_val_copy=yes])
])
if test "x$dbus_cv_va_val_copy" = "xno"; then
AC_DEFINE(DBUS_VA_COPY_AS_ARRAY,1, ['va_lists' cannot be copies as values])
fi
#### Atomic integers (checks by Sebastian Wilhelmi for GLib)
AC_MSG_CHECKING([whether to use inline assembler routines for atomic integers])
have_atomic_inc=no

20
dbus/dbus-string.c
View file

@ -31,6 +31,8 @@
#define DBUS_CAN_USE_DBUS_STRING_PRIVATE 1
#include "dbus-string-private.h"
#include "dbus-protocol.h"
/* for DBUS_VA_COPY */
#include "dbus-sysdeps.h"
/**
* @defgroup DBusString string class
@ -1013,16 +1015,26 @@ _dbus_string_append_printf_valist (DBusString *str,
{
int len;
char c;
va_list args_copy;
DBUS_STRING_PREAMBLE (str);
DBUS_VA_COPY (args_copy, args);
/* Measure the message length without terminating nul */
len = vsnprintf (&c, 1, format, args);
if (!_dbus_string_lengthen (str, len))
return FALSE;
{
/* don't leak the copy */
va_end (args_copy);
return FALSE;
}
vsprintf (real->str + (real->len - len),
format, args);
format, args_copy);
va_end (args_copy);
return TRUE;
}

14
dbus/dbus-sysdeps.h
View file

@ -306,6 +306,20 @@ void _dbus_set_signal_handler (int sig,
DBusSignalHandler handler);
/* Define DBUS_VA_COPY() to do the right thing for copying va_list variables.
* config.h may have already defined DBUS_VA_COPY as va_copy or __va_copy.
*/
#if !defined (DBUS_VA_COPY)
# if defined (__GNUC__) && defined (__PPC__) && (defined (_CALL_SYSV) || defined (_WIN32))
# define DBUS_VA_COPY(ap1, ap2) (*(ap1) = *(ap2))
# elif defined (DBUS_VA_COPY_AS_ARRAY)
# define DBUS_VA_COPY(ap1, ap2) memcpy ((ap1), (ap2), sizeof (va_list))
# else /* va_list is a pointer */
# define DBUS_VA_COPY(ap1, ap2) ((ap1) = (ap2))
# endif /* va_list is a pointer */
#endif /* !DBUS_VA_COPY */
DBUS_END_DECLS;
#endif /* DBUS_SYSDEPS_H */