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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)


include/m_string.h:
  EOVERFLOW
mysql-test/r/insert.result:
  updated
mysql-test/r/mysqldump.result:
  updated
strings/strtod.c:
  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, it my_strtod can be changed to return overflow status in a parameter (like my_strntod does)
This commit is contained in:
unknown 2004-03-14 17:25:20 +01:00
parent ad73b5ac5b
commit 22657f672c
4 changed files with 16 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/m_string.h
View File

@ -218,6 +218,9 @@ extern int is_prefix(const char *, const char *);
/* Conversion routines */
double my_strtod(const char *str, char **end);
double my_atof(const char *nptr);
#ifndef EOVERFLOW
#define EOVERFLOW 84
#endif
#ifdef USE_MY_ITOA
extern char *my_itoa(int val,char *dst,int radix);

10
mysql-test/r/insert.result
View File

@ -169,7 +169,6 @@ set @value= "1e+1111111111a";
insert into t1 values(null,@value,@value,@value,@value,@value,@value,@value,@value,@value);
Warnings:
Warning 1265 Data truncated for column 'f_double ' at row 1
Warning 1264 Data truncated, out of range for column 'f_double ' at row 1
Warning 1265 Data truncated for column 'f_float ' at row 1
Warning 1264 Data truncated, out of range for column 'f_float ' at row 1
Warning 1265 Data truncated for column 'f_double_7_2 ' at row 1
@ -177,7 +176,6 @@ Warning 1264 Data truncated, out of range for column 'f_double_7_2 ' at row 1
Warning 1265 Data truncated for column 'f_float_4_3 ' at row 1
Warning 1264 Data truncated, out of range for column 'f_float_4_3 ' at row 1
Warning 1265 Data truncated for column 'f_double_u ' at row 1
Warning 1264 Data truncated, out of range for column 'f_double_u ' at row 1
Warning 1265 Data truncated for column 'f_float_u ' at row 1
Warning 1264 Data truncated, out of range for column 'f_float_u ' at row 1
Warning 1265 Data truncated for column 'f_double_15_1_u ' at row 1
@ -199,7 +197,6 @@ set @value= "-1e+1111111111a";
insert into t1 values(null,@value,@value,@value,@value,@value,@value,@value,@value,@value);
Warnings:
Warning 1265 Data truncated for column 'f_double ' at row 1
Warning 1264 Data truncated, out of range for column 'f_double ' at row 1
Warning 1265 Data truncated for column 'f_float ' at row 1
Warning 1264 Data truncated, out of range for column 'f_float ' at row 1
Warning 1265 Data truncated for column 'f_double_7_2 ' at row 1
@ -228,17 +225,15 @@ f_float_3_1_u 0.0
set @value= 1e+1111111111;
insert into t1 values(null,@value,@value,@value,@value,@value,@value,@value,@value,@value);
Warnings:
Warning 1264 Data truncated, out of range for column 'f_double ' at row 1
Warning 1264 Data truncated, out of range for column 'f_float ' at row 1
Warning 1264 Data truncated, out of range for column 'f_double_7_2 ' at row 1
Warning 1264 Data truncated, out of range for column 'f_float_4_3 ' at row 1
Warning 1264 Data truncated, out of range for column 'f_double_u ' at row 1
Warning 1264 Data truncated, out of range for column 'f_float_u ' at row 1
Warning 1264 Data truncated, out of range for column 'f_double_15_1_u ' at row 1
Warning 1264 Data truncated, out of range for column 'f_float_3_1_u ' at row 1
select * from t1 where `number `=last_insert_id();
number 6
original_value inf
original_value 1.7976931348623e+308
f_double 1.79769313486232e+308
f_float 3.40282e+38
f_double_7_2 99999.99
@ -250,7 +245,6 @@ f_float_3_1_u 99.9
set @value= -1e+1111111111;
insert into t1 values(null,@value,@value,@value,@value,@value,@value,@value,@value,@value);
Warnings:
Warning 1264 Data truncated, out of range for column 'f_double ' at row 1
Warning 1264 Data truncated, out of range for column 'f_float ' at row 1
Warning 1264 Data truncated, out of range for column 'f_double_7_2 ' at row 1
Warning 1264 Data truncated, out of range for column 'f_float_4_3 ' at row 1
@ -260,7 +254,7 @@ Warning 1264 Data truncated, out of range for column 'f_double_15_1_u ' at row 1
Warning 1264 Data truncated, out of range for column 'f_float_3_1_u ' at row 1
select * from t1 where `number `=last_insert_id();
number 7
original_value -inf
original_value -1.7976931348623e+308
f_double -1.79769313486232e+308
f_float -3.40282e+38
f_double_7_2 -99999.99

2
mysql-test/r/mysqldump.result
View File

@ -46,8 +46,6 @@ UNLOCK TABLES;
DROP TABLE t1;
CREATE TABLE t1 (a double);
INSERT INTO t1 VALUES (-9e999999);
Warnings:
Warning 1264 Data truncated, out of range for column 'a' at row 1
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT, CHARACTER_SET_CLIENT=utf8 */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;

14
strings/strtod.c
View File

@ -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;
}