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sanity checks for decimal result buffers

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This commit is contained in:
serg@serg.mylan
2004-10-30 19:27:54 +02:00
parent 5c8155955b
commit 54403b233a
1 changed files with 19 additions and 0 deletions
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19
strings/decimal.c
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@ -115,6 +115,9 @@ static const dec1 powers10[DIG_PER_DEC1+1]={
1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000};
static const int dig2bytes[DIG_PER_DEC1+1]={0, 1, 1, 2, 2, 3, 3, 3, 4, 4};
#define sanity(d) DBUG_ASSERT((d)->len >0 && ((d)->buf[0] | \
(d)->buf[(d)->len-1] | 1))
#define FIX_INTG_FRAC_ERROR(len, intg1, frac1, error) \
do \
{ \
@ -306,6 +309,8 @@ static int str2dec(char *from, decimal *to, char **end, my_bool fixed)
int i, intg, frac, error, intg1, frac1;
dec1 x,*buf;
sanity(to);
while (my_isspace(&my_charset_latin1, *s))
s++;
if ((to->sign= (*s == '-')))
@ -461,6 +466,8 @@ static int ull2dec(ulonglong from, decimal *to)
ulonglong x=from;
dec1 *buf;
sanity(to);
for (intg1=1; from > DIG_BASE; intg1++, from/=DIG_BASE);
if (unlikely(intg1 > to->len))
{
@ -684,6 +691,8 @@ int bin2decimal(char *from, decimal *to, int precision, int scale)
dec1 *buf=to->buf, mask=(*from <0) ? -1 : 0;
char *stop;
sanity(to);
FIX_INTG_FRAC_ERROR(to->len, intg1, frac1, error);
if (unlikely(error))
{
@ -813,6 +822,8 @@ int decimal_round(decimal *from, decimal *to, int scale, dec_round_mode mode)
intg0=ROUND_UP(from->intg), error=E_DEC_OK, len=to->len;
dec1 *buf0=from->buf, *buf1=to->buf, x, y, carry=0;
sanity(to);
if (unlikely(frac0+intg0 > len))
{
frac0=len-intg0;
@ -955,6 +966,8 @@ static int do_add(decimal *from1, decimal *from2, decimal *to)
frac0=max(frac1, frac2), intg0=max(intg1, intg2), error;
dec1 *buf1, *buf2, *buf0, *stop, *stop2, x, carry;
sanity(to);
/* is there a need for extra word because of carry ? */
x=intg1 > intg2 ? from1->buf[0] :
intg2 > intg1 ? from2->buf[0] :
@ -1072,6 +1085,8 @@ static int do_sub(decimal *from1, decimal *from2, decimal *to)
if (to == 0) /* decimal_cmp() */
return carry == from1->sign ? 1 : -1;
sanity(to);
to->sign=from1->sign;
/* ensure that always from1 > from2 (and intg1 >= intg2) */
@ -1190,6 +1205,8 @@ int decimal_mul(decimal *from1, decimal *from2, decimal *to)
dec1 *buf1=from1->buf+intg1, *buf2=from2->buf+intg2, *buf0,
*start2, *stop2, *stop1, *start0, carry;
sanity(to);
i=intg0;
j=frac0;
FIX_INTG_FRAC_ERROR(to->len, intg0, frac0, error);
@ -1265,6 +1282,8 @@ static int do_div_mod(decimal *from1, decimal *from2,
if (mod)
to=mod;
sanity(to);
/* removing all the leading zeroes */
i=prec1 % DIG_PER_DEC1;
while (prec1 > 0 && *buf1 == 0)