ID: 50851
Updated by: [email protected]
Reported By: mmaning at practiceinsight dot net
-Status: Open
+Status: Bogus
Bug Type: Output Control
Operating System: Linux
PHP Version: 5.2.12
New Comment:
%22s pads to 22 chars in case the string is shorter than 22 chars.
Nowhere does it say that %22 will truncate a string longer than 22
chars to 22 chars, and in fact it doesn't. Not in any language. Try
compiling this:
#include <stdio.h>
void main(void) {
char *str20 = "12345678901234567890";
char *str40 = "1234567890123456789012345678901234567890";
printf("%22s\n",str20);
printf("%22s\n",str40);
}
Just type: make main
Then: ./main
Previous Comments:
------------------------------------------------------------------------
[2010-01-27 00:03:30] mmaning at practiceinsight dot net
Description:
------------
The %s function in sprintf works just like all of the other % commands
- except when you attempt to restrict how large the string is. See the
code below. Also, this happens for printf as well.
It also happens under Linux and Windows.
Since %22c doesn't work because %c only does a single character (it
returns a null string when trying to use %22c), only %22s can be used.
As can be seen from the first of the two lines, when the string passed
in is less than 22 characters - it is padded to be 22 characters long.
Thus negating anyone's wish to say "The %s function isn't supposed to be
used like that." If it wasn't, then the first occurrence would have
simply generated "(--------------------)" instead of what it did.
Reproduce code:
---------------
<?php
$s = str_repeat( "-", 20 );
echo sprintf( "My String (%22s) is 22 characters long.\n", $s );
$s = str_repeat( "-", 40 );
echo sprintf( "My String (%22s) is 22 characters long.\n", $s );
exit( 0 );
$s = str_repeat( "-", 20 );
printf( "My String (%22s) is 22 characters long.\n", $s );
$s = str_repeat( "-", 40 );
printf( "My String (%22s) is 22 characters long.\n", $s );
exit( 0 );
?>
Expected result:
----------------
My String ( --------------------) is 22 characters long.
My String (----------------------) is 22 characters long.
My String ( --------------------) is 22 characters long.
My String (----------------------) is 22 characters long.
Actual result:
--------------
My String ( --------------------) is 22 characters long.
My String (----------------------------------------) is 22 characters
long.
My String ( --------------------) is 22 characters long.
My String (----------------------------------------) is 22 characters
long.
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=50851&edit=1
