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BUG#31799: Scrambled number output due to integer overflow

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An integer overflow in number->string conversion caused completely
wrong output of the number LONGLONG_MIN with gcc 4.2.1.

Fixed by eliminating the overflow, using only operations that are
well-defined in ANSI C.


strings/ctype-simple.c:
  An integer overflow in number->string conversion caused completely
  wrong output of the number LONGLONG_MIN with gcc 4.2.1.
  
  Fixed by eliminating the overflow, using only operations that are
  well-defined in ANSI C.
strings/ctype-ucs2.c:
  An integer overflow in number->string conversion caused completely
  wrong output of the number LONGLONG_MIN with gcc 4.2.1.
  
  Fixed by eliminating the overflow, using only operations that are
  well-defined in ANSI C.
strings/int2str.c:
  An integer overflow in number->string conversion caused completely
  wrong output of the number LONGLONG_MIN with gcc 4.2.1.
  
  Fixed by eliminating the overflow, using only operations that are
  well-defined in ANSI C.
strings/longlong2str.c:
  An integer overflow in number->string conversion caused completely
  wrong output of the number LONGLONG_MIN with gcc 4.2.1.
  
  Fixed by eliminating the overflow, using only operations that are
  well-defined in ANSI C.
This commit is contained in:
unknown
2007-10-31 10:34:26 +01:00
parent c63f2e3fb6
commit f8b5a34083
4 changed files with 56 additions and 40 deletions
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16
strings/int2str.c
View File

@ -57,6 +57,7 @@ int2str(register long int val, register char *dst, register int radix,
register char *p;
long int new_val;
char *dig_vec= upcase ? _dig_vec_upper : _dig_vec_lower;
ulong uval= (ulong) val;
if (radix < 0)
{
@ -65,7 +66,8 @@ int2str(register long int val, register char *dst, register int radix,
if (val < 0)
{
*dst++ = '-';
val = -val;
/* Avoid integer overflow in (-val) for LONGLONG_MIN (BUG#31799). */
uval = (ulong)0 - uval;
}
radix = -radix;
}
@ -86,8 +88,8 @@ int2str(register long int val, register char *dst, register int radix,
*/
p = &buffer[sizeof(buffer)-1];
*p = '\0';
new_val=(ulong) val / (ulong) radix;
*--p = dig_vec[(uchar) ((ulong) val- (ulong) new_val*(ulong) radix)];
new_val= uval / (ulong) radix;
*--p = dig_vec[(uchar) (uval- (ulong) new_val*(ulong) radix)];
val = new_val;
#ifdef HAVE_LDIV
while (val != 0)
@ -133,20 +135,22 @@ char *int10_to_str(long int val,char *dst,int radix)
char buffer[65];
register char *p;
long int new_val;
unsigned long int uval = (unsigned long int) val;
if (radix < 0) /* -10 */
{
if (val < 0)
{
*dst++ = '-';
val = -val;
/* Avoid integer overflow in (-val) for LONGLONG_MIN (BUG#31799). */
uval = (unsigned long int)0 - uval;
}
}
p = &buffer[sizeof(buffer)-1];
*p = '\0';
new_val= (long) ((unsigned long int) val / 10);
*--p = '0'+ (char) ((unsigned long int) val - (unsigned long) new_val * 10);
new_val= (long) (uval / 10);
*--p = '0'+ (char) (uval - (unsigned long) new_val * 10);
val = new_val;
while (val != 0)