diff options
Diffstat (limited to 'lib/libc/stdio/floatio.h')
| -rw-r--r-- | lib/libc/stdio/floatio.h | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/lib/libc/stdio/floatio.h b/lib/libc/stdio/floatio.h index a40df00..22fedcd 100644 --- a/lib/libc/stdio/floatio.h +++ b/lib/libc/stdio/floatio.h @@ -41,7 +41,14 @@ * Floating point scanf/printf (input/output) definitions. */ -/* 11-bit exponent (VAX G floating point) is 308 decimal digits */ -#define MAXEXP 308 -/* 128 bit fraction takes up 39 decimal digits; max reasonable precision */ -#define MAXFRACT 39 +/* + * MAXEXPDIG is the maximum number of decimal digits needed to store a + * floating point exponent in the largest supported format. It should + * be ceil(log10(LDBL_MAX_10_EXP)) or, if hexadecimal floating point + * conversions are supported, ceil(log10(LDBL_MAX_EXP)). But since it + * is presently never greater than 5 in practice, we fudge it. + */ +#define MAXEXPDIG 6 +#if LDBL_MAX_EXP > 999999 +#error "floating point buffers too small" +#endif |
