diff options
Diffstat (limited to 'libio')
| -rw-r--r-- | libio/libioP.h | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/libio/libioP.h b/libio/libioP.h index ce5228e..958ef9b 100644 --- a/libio/libioP.h +++ b/libio/libioP.h @@ -759,9 +759,21 @@ extern off64_t _IO_seekpos_unlocked (FILE *, off64_t, int) allocation for input strings with %as, %aS and %a[, a GNU extension, is disabled. This is the behavior that the __isoc99_scanf family of functions use. When the flag is set to zero, automatic allocation is - enabled. */ -#define SCANF_LDBL_IS_DBL 0x0001 -#define SCANF_ISOC99_A 0x0002 + enabled. + + SCANF_LDBL_USES_FLOAT128 is used on platforms where the long double + format used to be different from the IEC 60559 double format *and* + also different from the Quadruple 128-bits IEC 60559 format (such as + the IBM Extended Precision format on powerpc or the 80-bits IEC 60559 + format on x86), but was later converted to the Quadruple 128-bits IEC + 60559 format, which is the same format that the _Float128 always has + (hence the `USES_FLOAT128' suffix in the name of the flag). When set + to one, this macros indicates that long double values are to be + handled as having this new format. Otherwise, they should be handled + as the previous format on that platform. */ +#define SCANF_LDBL_IS_DBL 0x0001 +#define SCANF_ISOC99_A 0x0002 +#define SCANF_LDBL_USES_FLOAT128 0x0004 extern int __vfscanf_internal (FILE *fp, const char *format, va_list argp, unsigned int flags) |