https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277612
Bug ID: 277612
Summary: libc printf not compatible with glibc with negative
nan
Product: Base System
Version: 14.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: misc
Assignee: b...@freebsd.org
Reporter: pjfl...@wanadoo.fr
I think that it would be better for compatibility for printf of negative nans
to include the minus sign.
The C standard does say
A double argument representing an infinity is converted in one of the styles
[-]inf or
[-]infinity — which style is implementation-defined. A double argument
representing a
NaN is converted in one of the styles [-]nan or [-]nan(n-char-sequence) — which
style and
the meaning of any n-char-sequence, is implementation-defined. The F conversion
specifier
produces INF, INFINITY, or NAN instead of inf, infinity, or nan,
respectively.337)
>From what I see the cod that controls this is
│ > 785 if (expt == INT_MAX) { /* inf or nan */
│ 786 if (*cp == 'N') {
│ 787 cp = (ch >= 'a') ? "nan" :
"NAN";
│ 788 sign = '\0';
in vfprintf.c
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