On Thu, 30 Mar 2017, Vincent Lefevre wrote:
On 2017-03-30 10:52:33 +0100, Claude Heiland-Allen wrote:
The failing source code is:
/* EOF for no matching */
{
char buf[128];
ret = gmp_sscanf (" ", "%s", buf);
ASSERT_ALWAYS (ret == EOF);
ret = fromstring_gmp_fscanf (" ", "%s", buf);
ASSERT_ALWAYS (ret == EOF);
if (option_libc_scanf)
{
ret = sscanf (" ", "%s", buf);
ASSERT_ALWAYS (ret == EOF);
ret = fun_fscanf (" ", "%s", buf, NULL);
ASSERT_ALWAYS (ret == EOF);
}
}
Commenting out the asserts and 'if' and inserting debugging printf()
statements gives:
gmp_sscanf() ret = 0
fromstring_gmp_fscanf() ret = 0
sscanf() ret = 0
^^^^^^^^^^^^^^^^
fun_fscanf() ret = 0
The initial issue is the 0 returned by sscanf(). Then GMP is consistent
with the C implementation.
Though the C standard may be ambiguous, 0 is not possible as a return
value. Thus this is a bug in the C library (or compiler).
Could the macro __USE_MINGW_ANSI_STDIO be relevant?
--
Marc Glisse
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