/* Compatibility functions for floating point formatting, reentrant versions.
- Copyright (C) 1995,96,97,98,99,2000,01,02 Free Software Foundation, Inc.
+ Copyright (C) 1995,96,97,98,99,2000,01,02,04 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
# define FUNC_PREFIX
# define FLOAT_FMT_FLAG
# define FLOAT_NAME_EXT
+# define FLOAT_MIN_10_EXP DBL_MIN_10_EXP
# if DBL_MANT_DIG == 53
# define NDIGIT_MAX 17
# elif DBL_MANT_DIG == 24
# error "NDIGIT_MAX must be precomputed"
# define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * DBL_MANT_DIG + 1.0)))
# endif
+# if DBL_MIN_10_EXP == -37
+# define FLOAT_MIN_10_NORM 1.0e-37
+# elif DBL_MIN_10_EXP == -307
+# define FLOAT_MIN_10_NORM 1.0e-307
+# elif DBL_MIN_10_EXP == -4931
+# define FLOAT_MIN_10_NORM 1.0e-4931
+# else
+/* libc can't depend on libm. */
+# error "FLOAT_MIN_10_NORM must be precomputed"
+# define FLOAT_MIN_10_NORM exp10 (DBL_MIN_10_EXP)
+# endif
#endif
#define APPEND(a, b) APPEND2 (a, b)
d = -value;
else
d = value;
+ /* For denormalized numbers the d < 1.0 case below won't work,
+ as f can overflow to +Inf. */
+ if (d < FLOAT_MIN_10_NORM)
+ {
+ value /= FLOAT_MIN_10_NORM;
+ if (value < 0.0)
+ d = -value;
+ else
+ d = value;
+ exponent += FLOAT_MIN_10_EXP;
+ }
if (d < 1.0)
{
do