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Safe casting functions #874

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0de1e1a
toInt(), toFloat() and toString() safe casting functions
hikari-no-yume Oct 5, 2014
78101d5
Renamed toInt/toFloat/toString to to_int/to_float/to_string
hikari-no-yume Oct 6, 2014
a0f372c
Return FALSE on failure, not NULL
hikari-no-yume Oct 6, 2014
c3a73f0
Removed base argument from to_int
hikari-no-yume Oct 6, 2014
26c7ecf
Oh, RETURN_FALSE *does* exist
hikari-no-yume Oct 6, 2014
56ae42a
use zend_string_copy to avoid breaking interned strings
hikari-no-yume Oct 6, 2014
82cefa6
Removed redundant breaks
hikari-no-yume Oct 6, 2014
6fc532b
Removed unneeded TSRMLS_FETCH();
hikari-no-yume Oct 6, 2014
9ea1bfb
Add commented-out zend_strpprintf block mentioning segfault
hikari-no-yume Oct 6, 2014
9d135f7
Reject non-integral floats passed to to_int
hikari-no-yume Oct 9, 2014
c672669
We don't need to use zend_dval_to_lval here
hikari-no-yume Oct 9, 2014
9898449
Removed the (now redundant) INF/NAN check
hikari-no-yume Oct 9, 2014
03401d9
Clarify that "10.0" should work for float, not for int
hikari-no-yume Oct 11, 2014
6c05ba9
Don't permit leading or trailing whitespace
hikari-no-yume Oct 20, 2014
0cce32d
Test string overflow, octal, hex for to_int()
hikari-no-yume Oct 21, 2014
0f7c856
Test string overflow, octal, hex for to_int(), to_float()
hikari-no-yume Oct 21, 2014
5158a43
Merge branch 'master' into safe_casts
hikari-no-yume Nov 7, 2014
b845227
Merge branch 'master' into safe_casts
hikari-no-yume Nov 10, 2014
f5cf9df
Return NULL, not FALSE, on failure
hikari-no-yume Nov 11, 2014
9afe6a5
Reject leading 0, +
hikari-no-yume Nov 12, 2014
d9361da
Test empty strings
hikari-no-yume Nov 12, 2014
6144649
Note that first char check also excludes empty strings
hikari-no-yume Nov 12, 2014
fccf267
Use more efficient float-string conversion which appears not to segfa…
hikari-no-yume Nov 14, 2014
5632a34
Move casting behaviour into own functions, to allow multiple interfaces
hikari-no-yume Nov 14, 2014
d6c0182
Made to_* functions throw exceptions, add try_* functions to return NULL
hikari-no-yume Nov 14, 2014
7b3a900
Allow + prefix to signify sign
hikari-no-yume Nov 19, 2014
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Add commented-out zend_strpprintf block mentioning segfault
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@hikari-no-yume
hikari-no-yume committed Oct 6, 2014
commit 9ea1bfb0a6668afdeecd7bdd939c8a7c625cd679
7 changes: 7 additions & 0 deletions ext/standard/type.c
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Original file line number Diff line number Diff line change
Expand Up @@ -544,6 +544,13 @@ PHP_FUNCTION(to_string)
RETURN_STR(zend_long_to_str(Z_LVAL_P(var)));

case IS_DOUBLE:
/* This code, despite being used in many other places, segfaults
* Since I can't figure out why, it's commented out for now
* This is a shame, as an extra malloc is always bad
* TODO: Stop this segfaulting so we can use it instead
*/
/*RETVAL_STR(zend_strpprintf("%.*G", (int) EG(precision), Z_DVAL_P(var)));*/
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zend_strpprintf(0, "%.*G", (int) EG(precision), Z_DVAL_P(var));

max_len is first parameter ... http://lxr.php.net/xref/PHP_TRUNK/Zend/zend_exceptions.h#57

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Alright, if I do that, I just get this:

Segmentation fault: 11

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With this patch applied:

diff --git a/ext/standard/type.c b/ext/standard/type.c
index 3c1d4a7..12e5320 100644
--- a/ext/standard/type.c
+++ b/ext/standard/type.c
@@ -546,25 +546,7 @@ PHP_FUNCTION(to_string)
                        RETURN_STR(zend_long_to_str(Z_LVAL_P(var)));

                case IS_DOUBLE:
-                       /* This code, despite being used in many other places, segfaults
-                        * Since I can't figure out why, it's commented out for now
-                        * This is a shame, as an extra malloc is always bad
-                        * TODO: Stop this segfaulting so we can use it instead
-                        */ 
-                       /*RETVAL_STR(zend_strpprintf("%.*G", (int) EG(precision), Z_DVAL_P(var)));*/
-
-                       {
-                               char *str;
-                               zend_string *zstr;
-                               int len;
-
-                               str = emalloc(MAX_LENGTH_OF_DOUBLE + EG(precision) + 1);
-                               len = zend_sprintf(str, "%.*G", (int) EG(precision), Z_DVAL_P(var));
-                               zstr = zend_string_init(str, len, 0);
-                               RETVAL_STR(zstr);
-                               efree(str);
-                       }
-                       return;
+                       RETURN_STR(strpprintf(0, "%.*G", (int) EG(precision), Z_DVAL_P(var)));

                case IS_OBJECT:
                        {

I pass to_string test.


{
char *str;
zend_string *zstr;
Expand Down