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2006-04-22 Yoshinori K. Okuji <okuji@enbug.org>

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* kern/misc.c (grub_lltoa): Rewritten the decimal conversion part,
        as it was simply too buggy.
This commit is contained in:
okuji 2006-04-22 09:20:44 +00:00
parent 970d3b8ab0
commit 49986a9f99
2 changed files with 32 additions and 16 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2006-04-22 Yoshinori K. Okuji <okuji@enbug.org>
* kern/misc.c (grub_lltoa): Rewritten the decimal conversion part,
as it was simply too buggy.
2006-04-21 Yoshinori K. Okuji <okuji@enbug.org>
* kern/misc.c (grub_lltoa): New function.

43
kern/misc.c
View file

@ -526,22 +526,33 @@ grub_lltoa (char *str, int c, unsigned long long n)
/* BASE == 10 */
do
{
unsigned high, low;
unsigned high_mod, low_mod;
unsigned d;
high = (unsigned) (n >> 32);
low = (unsigned) (n & 0xffffffff);
high_mod = high % 10;
low_mod = low % 10;
/* 6 = (1 << 32) % 10 */
d = (high_mod * 6 + low_mod) % 10;
*p++ = d + '0';
/* (HIGH_MOD << 31) / 5 = (HIGH_MOD << 32) / 10 */
n = (((unsigned long long) (high / 10) << 32)
+ ((high_mod << 31) / 5)
+ low_mod / 10);
/* This algorithm is typically implemented by hardware. The idea
is to get the highest bit in N, 64 times, by keeping
upper(N * 2^i) = upper((Q * 10 + M) * 2^i), where upper
represents the high 64 bits in 128-bits space. */
unsigned bits = sizeof (unsigned long long) * 8;
unsigned long long q = 0;
unsigned m = 0;
while (bits--)
{
m <<= 1;
if ((long long ) n < 0)
m |= 1;
q <<= 1;
n <<= 1;
if (m >= 10)
{
q |= 1;
m -= 10;
}
}
*p++ = m + '0';
n = q;
}
while (n);