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Never stop prematurely reading digits before the decimal point is found. Compute exponent limit for negative exponents correctly. For numbers ending in all zeros eat the zeroes even before the decimal point if the exponent is negative.

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This commit is contained in:
Ulrich Drepper 2001-02-07 08:28:15 +00:00
parent 18e532f18e
commit 55ae3aa64f
1 changed files with 19 additions and 11 deletions
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30
stdlib/strtod.c
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@ -698,10 +698,7 @@ INTERNAL (STRTOF) (nptr, endptr, group LOCALE_PARAM)
decimal point, exponent character or any non-FP number character. */
startp = cp;
dig_no = 0;
while (dig_no < (base == 16 ? HEXNDIG : NDIG) ||
/* If parsing grouping info, keep going past useful digits
so we can check all the grouping separators. */
grouping)
while (1)
{
if ((c >= L_('0') && c <= L_('9'))
|| (base == 16 && TOLOWER (c) >= L_('a') && TOLOWER (c) <= L_('f')))
@ -760,11 +757,6 @@ INTERNAL (STRTOF) (nptr, endptr, group LOCALE_PARAM)
}
}
if (dig_no >= (base == 16 ? HEXNDIG : NDIG))
/* Too many digits to be representable. Assigning this to EXPONENT
allows us to read the full number but return HUGE_VAL after parsing. */
exponent = MAX_10_EXP;
/* We have the number digits in the integer part. Whether these are all or
any is really a fractional digit will be decided later. */
int_no = dig_no;
@ -820,11 +812,11 @@ INTERNAL (STRTOF) (nptr, endptr, group LOCALE_PARAM)
/* Get the exponent limit. */
if (base == 16)
exp_limit = (exp_negative ?
-MIN_EXP + MANT_DIG - 4 * int_no :
-MIN_EXP + MANT_DIG + 4 * int_no :
MAX_EXP - 4 * int_no + lead_zero);
else
exp_limit = (exp_negative ?
-MIN_10_EXP + MANT_DIG - int_no :
-MIN_10_EXP + MANT_DIG + int_no :
MAX_10_EXP - int_no + lead_zero);
do
@ -882,6 +874,22 @@ INTERNAL (STRTOF) (nptr, endptr, group LOCALE_PARAM)
assert (dig_no >= int_no);
}
if (dig_no == int_no && dig_no > 0 && exponent < 0)
do
{
while (expp[-1] < L_('0') || expp[-1] > L_('9'))
--expp;
if (expp[-1] != L_('0'))
break;
--expp;
--dig_no;
--int_no;
++exponent;
}
while (dig_no > 0 && exponent < 0);
number_parsed:
/* The whole string is parsed. Store the address of the next character. */