diff options
Diffstat (limited to 'stdio-common/printf_fphex.c')
| -rw-r--r-- | stdio-common/printf_fphex.c | 50 |
1 files changed, 35 insertions, 15 deletions
diff --git a/stdio-common/printf_fphex.c b/stdio-common/printf_fphex.c index 76084a8de5..4099bf2dd1 100644 --- a/stdio-common/printf_fphex.c +++ b/stdio-common/printf_fphex.c @@ -1,6 +1,6 @@ /* Print floating point number in hexadecimal notation according to ISO C 9X. - Copyright (C) 1997 Free Software Foundation, Inc. + Copyright (C) 1997, 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. @@ -244,16 +244,26 @@ __printf_fphex (FILE *fp, exponent = fpnum.dbl.ieee.exponent; - if (exponent == 0 ? !zero_mantissa : exponent < IEEE754_DOUBLE_BIAS) + if (exponent == 0) { - expnegative = 1; - exponent = -(exponent - IEEE754_DOUBLE_BIAS); + if (zero_mantissa) + expnegative = 0; + else + { + /* This is a denormalized number. */ + expnegative = 1; + exponent = -(1 - IEEE754_DOUBLE_BIAS); + } } - else + else if (exponent >= IEEE754_DOUBLE_BIAS) { expnegative = 0; - if (exponent != 0) - exponent -= IEEE754_DOUBLE_BIAS; + exponent -= IEEE754_DOUBLE_BIAS; + } + else + { + expnegative = 1; + exponent = -(exponent - IEEE754_DOUBLE_BIAS); } } else @@ -282,20 +292,30 @@ __printf_fphex (FILE *fp, /* We use a full nibble for the leading digit. */ leading = *numstr++; - /* We have 3 bits from the mantissa in the leading nibble. */ + /* We have 3 bits from the mantissa in the leading nibble. + Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'. */ exponent = fpnum.ldbl.ieee.exponent; - if (exponent == 0 ? !zero_mantissa - : exponent < IEEE854_LONG_DOUBLE_BIAS + 3) + if (exponent == 0) { - expnegative = 1; - exponent = -(exponent - (IEEE854_LONG_DOUBLE_BIAS + 3)); + if (zero_mantissa) + expnegative = 0; + else + { + /* This is a denormalized number. */ + expnegative = 1; + exponent = -(1 - (IEEE854_LONG_DOUBLE_BIAS + 3)); + } } - else + else if (exponent >= IEEE854_LONG_DOUBLE_BIAS + 3) { expnegative = 0; - if (exponent != 0) - exponent -= IEEE854_LONG_DOUBLE_BIAS + 3; + exponent -= IEEE854_LONG_DOUBLE_BIAS + 2; + } + else + { + expnegative = 1; + exponent = -(exponent - (IEEE854_LONG_DOUBLE_BIAS + 3)); } } |