#47842 [Opn]: sscanf does not support 64-bit values

 ID:               47842
 User updated by:  signe at cothlamadh dot net
 Reported By:      signe at cothlamadh dot net
 Status:           Open
 Bug Type:         Unknown/Other Function
 Operating System: FreeBSD 64-bit, Linux 64-bit
 PHP Version:      5.2.9
 New Comment:

Note: sscanf %x and %X have the same behavior as %d and %u


Previous Comments:
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[2009-03-30 21:26:23] signe at cothlamadh dot net

Description:
------------
On 64-bit operating systems, printf()'s %d and %u formatting codes
support 64-bit integers.   sscanf, which supposedly uses the same code
(and has the same expected behavior) does not support 64-bit values.

Also, printf is not outputting accurate values when it reaches numbers
near the upper bounds of a 64-bit int.

Reproduce code:
---------------
<?php

sscanf("2147483647", '%d', $int);
echo "sscanf 32-bit signed int '2147483647'           (2^31)-1 =
",$int,"\n";
sscanf("4294967295", '%u', $int);
echo "sscanf 32-bit unsign int '4294967295'           (2^32)-1 =
",$int,"\n";

sscanf("9223372036854775807", '%d', $int);
echo "sscanf 64-bit signed int '9223372036854775807'  (2^63)-1 =
",$int,"\n";
sscanf("18446744073709551615", '%u', $int);
echo "sscanf 64-bit unsign int '18446744073709551615' (2^64)-1 =
",$int,"\n";

printf("printf 64-bit signed int '9223372036854775807'  (2^63)-1 =
%d\n", 9223372036854775807);
printf("printf 64-bit signed int '18446744073709551615' (2^64)-1 =
%u\n", 18446744073709551615);


echo "\n(2^64)-1 - 100,000,000\n";
printf("printf 64-bit signed int '18446744073609551615' = %u\n",
18446744073609551615);
echo "Output is 257 greater than input\n";
?>

Expected result:
----------------
sscanf 32-bit signed int '2147483647'           (2^31)-1 = 2147483647
sscanf 32-bit unsign int '4294967295'           (2^32)-1 = 4294967295
sscanf 64-bit signed int '9223372036854775807'  (2^63)-1 =
9223372036854775807
sscanf 64-bit unsign int '18446744073709551615' (2^64)-1 =
18446744073709551615
printf 64-bit signed int '9223372036854775807'  (2^63)-1 =
9223372036854775807
printf 64-bit signed int '18446744073709551615' (2^64)-1 =
18446744073709551615

Actual result:
--------------
sscanf 32-bit signed int '2147483647'           (2^31)-1 = 2147483647
sscanf 32-bit unsign int '4294967295'           (2^32)-1 = 4294967295
sscanf 64-bit signed int '9223372036854775807'  (2^63)-1 = -1
sscanf 64-bit unsign int '18446744073709551615' (2^64)-1 = 4294967295
printf 64-bit signed int '9223372036854775807'  (2^63)-1 =
9223372036854775807
printf 64-bit signed int '18446744073709551615' (2^64)-1 = 0


printf 64-bit signed int '18446744073609551615' ((2^64)-1 - 100000000)
= 18446744073609551872
Output is 257 greater than input


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Edit this bug report at http://bugs.php.net/?id=47842&edit=1