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Fix strtod rounding of hex values (bug 14049).

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This commit is contained in:
Joseph Myers 2012-05-04 10:44:39 +00:00
parent 5197d9c2b4
commit 8f203e6cb6
4 changed files with 28 additions and 5 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2012-05-04 Joseph Myers <joseph@codesourcery.com>
[BZ #14049]
* stdlib/strtod_l.c (____STRTOF_INTERNAL): Check for trailing
nonzero digits before rounding a hex value.
* stdlib/tst-strtod.c (tests): Add another test.
2012-05-03 Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
* sysdeps/s390/fpu/libm-test-ulps: Update.

2
NEWS
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@ -23,7 +23,7 @@ Version 2.16
13872, 13873, 13879, 13883, 13886, 13892, 13895, 13908, 13910, 13911,
13912, 13913, 13915, 13916, 13917, 13918, 13919, 13920, 13921, 13924,
13926, 13927, 13928, 13938, 13941, 13942, 13963, 13967, 13970, 13973,
14027, 14033, 14034, 14040, 14055
14027, 14033, 14034, 14040, 14049, 14055
* ISO C11 support:

19
stdlib/strtod_l.c
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@ -1,6 +1,5 @@
/* Convert string representing a number to float value, using given locale.
Copyright (C) 1997,1998,2002,2004,2005,2006,2007,2008,2009,2010,2011
Free Software Foundation, Inc.
Copyright (C) 1997-2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@ -994,8 +993,20 @@ ____STRTOF_INTERNAL (nptr, endptr, group, loc)
retval[idx--] |= val >> (4 - pos - 1);
val <<= BITS_PER_MP_LIMB - (4 - pos - 1);
if (idx < 0)
return round_and_return (retval, exponent, negative, val,
BITS_PER_MP_LIMB - 1, dig_no > 0);
{
int rest_nonzero = 0;
while (--dig_no > 0)
{
if (*startp != L_('0'))
{
rest_nonzero = 1;
break;
}
startp++;
}
return round_and_return (retval, exponent, negative, val,
BITS_PER_MP_LIMB - 1, rest_nonzero);
}
retval[idx] = val;
pos = BITS_PER_MP_LIMB - 1 - (4 - pos - 1);

5
stdlib/tst-strtod.c
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@ -69,6 +69,11 @@ static const struct ltest tests[] =
{ "+InFiNiTy", HUGE_VAL, '\0', 0 },
{ "0x80000Ap-23", 0x80000Ap-23, '\0', 0 },
{ "1e-324", 0, '\0', ERANGE },
{ "0x100000000000008p0", 0x1p56, '\0', 0 },
{ "0x100000000000008.p0", 0x1p56, '\0', 0 },
{ "0x100000000000008.00p0", 0x1p56, '\0', 0 },
{ "0x10000000000000800p0", 0x1p64, '\0', 0 },
{ "0x10000000000000801p0", 0x1.0000000000001p64, '\0', 0 },
{ NULL, 0, '\0', 0 }
};