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[BZ #3673]

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* stdlib/strtod_l.c (____STRTOF_INTERNAL): Fix exp_limit
	computation.
	* stdlib/Makefile (tests): Add tst-atof2.
	* stdlib/tst-atof2.c: New file.

	* stdlib/Makefile (tests): Add tst-atof1.
	* stdlib/tst-atof1.c: New file.
This commit is contained in:
Ulrich Drepper 2006-12-10 01:11:45 +00:00
parent d117c1ce4d
commit 2282c90c42
4 changed files with 74 additions and 8 deletions
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8
ChangeLog
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@ -1,8 +1,16 @@
2006-12-09 Ulrich Drepper <drepper@redhat.com>
[BZ #3673]
* stdlib/strtod_l.c (____STRTOF_INTERNAL): Fix exp_limit
computation.
* stdlib/Makefile (tests): Add tst-atof2.
* stdlib/tst-atof2.c: New file.
[BZ #3674]
* stdlib/strtod_l.c (____STRTOF_INTERNAL): Adjust exponent value
correctly if removing trailing zero of hex-float.
* stdlib/Makefile (tests): Add tst-atof1.
* stdlib/tst-atof1.c: New file.
2006-12-09 Jakub Jelinek <jakub@redhat.com>

3
stdlib/Makefile
View File

@ -66,7 +66,8 @@ tests := tst-strtol tst-strtod testmb testrand testsort testdiv \
test-canon test-canon2 tst-strtoll tst-environ \
tst-xpg-basename tst-random tst-random2 tst-bsearch \
tst-limits tst-rand48 bug-strtod tst-setcontext \
test-a64l tst-qsort tst-system testmb2 bug-strtod2
test-a64l tst-qsort tst-system testmb2 bug-strtod2 \
tst-atof1 tst-atof2
include ../Makeconfig

16
stdlib/strtod_l.c
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@ -759,13 +759,15 @@ ____STRTOF_INTERNAL (nptr, endptr, group, loc)
}
}
/* We have the number digits in the integer part. Whether these are all or
any is really a fractional digit will be decided later. */
/* We have the number of digits in the integer part. Whether these
are all or any is really a fractional digit will be decided
later. */
int_no = dig_no;
lead_zero = int_no == 0 ? -1 : 0;
/* Read the fractional digits. A special case are the 'american style'
numbers like `16.' i.e. with decimal but without trailing digits. */
/* Read the fractional digits. A special case are the 'american
style' numbers like `16.' i.e. with decimal point but without
trailing digits. */
if (
#ifdef USE_WIDE_CHAR
c == (wint_t) decimal
@ -815,15 +817,16 @@ ____STRTOF_INTERNAL (nptr, endptr, group, loc)
if (base == 16)
exp_limit = (exp_negative ?
-MIN_EXP + MANT_DIG + 4 * int_no :
MAX_EXP - 4 * int_no + lead_zero);
MAX_EXP - 4 * int_no + 4 * lead_zero + 3);
else
exp_limit = (exp_negative ?
-MIN_10_EXP + MANT_DIG + int_no :
MAX_10_EXP - int_no + lead_zero);
MAX_10_EXP - int_no + lead_zero + 1);
do
{
exponent *= 10;
exponent += c - L_('0');
if (exponent > exp_limit)
/* The exponent is too large/small to represent a valid
@ -853,7 +856,6 @@ ____STRTOF_INTERNAL (nptr, endptr, group, loc)
/* NOTREACHED */
}
exponent += c - L_('0');
c = *++cp;
}
while (c >= L_('0') && c <= L_('9'));

55
stdlib/tst-atof2.c Normal file
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@ -0,0 +1,55 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static const struct
{
const char *str;
const char *expected;
} tests[] =
{
{ "1e308", "1e+308" },
{ "100000000e300", "1e+308" },
{ "0x1p1023", "8.98847e+307" },
{ "0x1000p1011", "8.98847e+307" },
{ "0x1p1020", "1.12356e+307" },
{ "0x0.00001p1040", "1.12356e+307" },
{ "1e-307", "1e-307" },
{ "0.000001e-301", "1e-307" },
{ "0.0000001e-300", "1e-307" },
{ "0.00000001e-299", "1e-307" },
{ "1000000e-313", "1e-307" },
{ "10000000e-314", "1e-307" },
{ "100000000e-315", "1e-307" },
{ "0x1p-1021", "4.45015e-308" },
{ "0x1000p-1033", "4.45015e-308" },
{ "0x10000p-1037", "4.45015e-308" },
{ "0x0.001p-1009", "4.45015e-308" },
{ "0x0.0001p-1005", "4.45015e-308" },
};
#define NTESTS (sizeof (tests) / sizeof (tests[0]))
static int
do_test (void)
{
int status = 0;
for (int i = 0; i < NTESTS; ++i)
{
char buf[100];
snprintf (buf, sizeof (buf), "%g", atof (tests[i].str));
if (strcmp (buf, tests[i].expected) != 0)
{
printf ("%d: got \"%s\", expected \"%s\"\n",
i, buf, tests[i].expected);
status = 1;
}
}
return status;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"