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my_strtod fixes:

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sigsegv protection (exp overflow)
don't return inf!
use errno=EOVERFLOW to signal an overflow (as my_strntod uses errno anyway)
if errno will be too slow, my_strtod can be changed to return overflow status in a parameter (like my_strntod does)
This commit is contained in:
serg@serg.mylan
2004-03-14 17:25:20 +01:00
parent 42c19ada56
commit ded8fa56eb
4 changed files with 16 additions and 13 deletions
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14
strings/strtod.c
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@ -2,7 +2,7 @@
An alternative implementation of "strtod()" that is both
simplier, and thread-safe.
From mit-threads as bundled with MySQL 3.22
From mit-threads as bundled with MySQL 3.23
SQL:2003 specifies a number as
@ -41,6 +41,7 @@ double my_strtod(const char *str, char **end)
double result= 0.0;
int negative, ndigits;
const char *old_str;
my_bool overflow=0;
while (my_isspace(&my_charset_latin1, *str))
str++;
@ -85,7 +86,8 @@ double my_strtod(const char *str, char **end)
double scaler= 1.0;
while (my_isdigit (&my_charset_latin1, *str))
{
exp= exp*10 + *str - '0';
if (exp < 9999) /* protection against exp overflow */
exp= exp*10 + *str - '0';
str++;
}
if (exp >= 1000)
@ -93,7 +95,7 @@ double my_strtod(const char *str, char **end)
if (neg)
result= 0.0;
else
result= DBL_MAX*10;
overflow=1;
goto done;
}
while (exp >= 100)
@ -113,6 +115,12 @@ done:
if (end)
*end = (char *)str;
if (overflow || ((overflow=isinf(result))))
{
result=DBL_MAX;
errno=EOVERFLOW;
}
return negative ? -result : result;
}