Fix for bug 67839 (mysqli does not handle 4-byte floats correctly)

ext/mysqli/tests/010.phpt

@@ -62,18 +62,18 @@ mysqli_close($link);
 --EXPECT--
 array(7) {
   [0]=>
-  float(3.14159274101)
+  float(3.141593)
   [1]=>
-  float(-9.99999997475E-7)
+  float(-1.0E-6)
   [2]=>
   float(0)
   [3]=>
-  float(999999995904)
+  float(1.0E+12)
   [4]=>
-  float(0.564642488956)
+  float(0.5646425)
   [5]=>
   float(1)
   [6]=>
-  float(8.88888914608E+14)
+  float(8.888889E+14)
 }
-done!
+done!

ext/mysqli/tests/011.phpt

@@ -67,12 +67,12 @@ array(8) {
   [3]=>
   int(4999999)
   [4]=>
-  float(2345.60009766)
+  float(2345.6)
   [5]=>
   float(5678.89563)
   [6]=>
   string(6) "foobar"
   [7]=>
   %unicode|string%(11) "mysql rulez"
 }
-done!
+done!

ext/mysqli/tests/012.phpt

@@ -66,12 +66,12 @@ array(8) {
   [3]=>
   int(54)
   [4]=>
-  float(2.59999990463)
+  float(2.6)
   [5]=>
   float(58.89)
   [6]=>
   string(3) "206"
   [7]=>
   %unicode|string%(3) "6.7"
 }
-done!
+done!

ext/mysqli/tests/bug67839.phpt

@@ -0,0 +1,58 @@
+--TEST--
+mysqli_float_handling - ensure 4 byte float is handled correctly
+--SKIPIF--
+<?php
+	require_once('skipif.inc');
+	require_once('skipifemb.inc');
+	require_once('skipifconnectfailure.inc');
+?>
+--FILE--
+<?php
+	require('connect.inc');
+	if (!$link = my_mysqli_connect($host, $user, $passwd, $db, $port, $socket)) {
+		printf("[001] [%d] %s\n", mysqli_connect_errno(), mysqli_connect_error());
+		die();
+	}
+
+
+	if (!mysqli_query($link, "DROP TABLE IF EXISTS test")) {
+		printf("[002] [%d] %s\n", mysqli_errno($link), mysqli_error($link));
+		die();
+	}
+
+	if (!mysqli_query($link, "CREATE TABLE test(id INT PRIMARY KEY, fp4 FLOAT, fp8 DOUBLE) ENGINE = InnoDB")) {
+		printf("[003] [%d] %s\n", mysqli_errno($link), mysqli_error($link));
+		die();
+	}
+
+	// Insert via string to make sure the real floating number gets to the DB
+	if (!mysqli_query($link, "INSERT INTO test(id, fp4, fp8) VALUES (1, 9.9999, 9.9999)")) {
+		printf("[004] [%d] %s\n", mysqli_errno($link), mysqli_error($link));
+		die();
+	}
+
+	if (!($stmt = mysqli_prepare($link, "SELECT id, fp4, fp8 FROM test"))) {
+		printf("[005] [%d] %s\n", mysqli_errno($link), mysqli_error($link));
+		die();
+	}
+
+	if (!mysqli_stmt_execute($stmt)) {
+		printf("[006] [%d] %s\n", mysqli_errno($link), mysqli_error($link));
+		die();
+	}
+
+
+	if (!($result = mysqli_stmt_get_result($stmt))) {
+		printf("[007] [%d] %s\n", mysqli_errno($link), mysqli_error($link));
+		die();
+	}
+
+	$data = mysqli_fetch_assoc($result);
+	print $data['id'] . ": " . $data['fp4'] . ": " . $data['fp8'] . "\n";
+?>
+--CLEAN--
+<?php
+	require_once("clean_table.inc");
+?>
+--EXPECTF--
+1: 9.9999: 9.9999

ext/mysqli/tests/mysqli_change_user.phpt

@@ -41,6 +41,11 @@ require_once('skipifconnectfailure.inc');
 	if (false !== ($tmp = mysqli_change_user($link, $user, $passwd, $db . '_unknown_really')))
 		printf("[009] Expecting false, got %s/%s\n", gettype($tmp), $tmp);
 
+	// Reconnect because after 3 failed change_user attempts, the server blocks you off.
+	if (!$link = my_mysqli_connect($host, $user, $passwd, $db, $port, $socket))
+		printf("[006] Cannot connect to the server using host=%s, user=%s, passwd=***, dbname=%s, port=%s, socket=%s\n",
+			$host, $user, $db, $port, $socket);
+
 	if (!mysqli_query($link, 'SET @mysqli_change_user_test_var=1'))
 		printf("[010] Failed to set test variable: [%d] %s\n", mysqli_errno($link), mysqli_error($link));
 
@@ -109,4 +114,4 @@ require_once('skipifconnectfailure.inc');
 	print "done!";
 ?>
 --EXPECTF--
-done!
+done!

ext/mysqli/tests/mysqli_change_user_oo.phpt

@@ -43,6 +43,11 @@ if (!$IS_MYSQLND && (mysqli_get_server_version($link) < 50118 && mysqli_get_serv
 	if (false !== ($tmp = $mysqli->change_user($user, $passwd, $db . '_unknown_really')))
 		printf("[008] Expecting false, got %s/%s\n", gettype($tmp), $tmp);
 
+	// Reconnect because after 3 failed change_user attempts, the server blocks you off.
+	if (!$mysqli = new my_mysqli($host, $user, $passwd, $db, $port, $socket))
+		printf("[001] Cannot connect to the server using host=%s, user=%s, passwd=***, dbname=%s, port=%s, socket=%s\n",
+			$host, $user, $db, $port, $socket);
+
 	if (!$mysqli->query('SET @mysqli_change_user_test_var=1'))
 		printf("[009] Failed to set test variable: [%d] %s\n", $mysqli->errno, $mysqli->error);
 
@@ -81,4 +86,4 @@ if (!$IS_MYSQLND && (mysqli_get_server_version($link) < 50118 && mysqli_get_serv
 	print "done!";
 ?>
 --EXPECTF--
-done!
+done!

ext/mysqli/tests/mysqli_real_escape_string_gbk.phpt

@@ -36,7 +36,7 @@ $port, $socket, mysqli_connect_errno(), mysqli_connect_error());
 mysqli_error($link));
 	}
 
-	if (!mysqli_query($link, 'CREATE TABLE test(id INT, label CHAR(1), PRIMARY
+	if (!mysqli_query($link, 'CREATE TABLE test(id INT, label CHAR(3), PRIMARY
 KEY(id)) ENGINE=' . $engine . " DEFAULT CHARSET=gbk")) {
 		printf("Failed to create test table: [%d] %s\n", mysqli_errno($link),
 mysqli_error($link));

ext/mysqli/tests/table.inc

@@ -12,6 +12,11 @@ if (!mysqli_query($link, 'DROP TABLE IF EXISTS test')) {
 	exit(1);
 }
 
+if (!mysqli_query($link, 'SET SESSION sql_mode=\'\'')) {
+	printf("Failed to drop old test table: [%d] %s\n", mysqli_errno($link), mysqli_error($link));
+	exit(1);
+}
+
 if (!mysqli_query($link, 'CREATE TABLE test(id INT, label CHAR(1), PRIMARY KEY(id)) ENGINE=' . $engine)) {
 	printf("Failed to create test table: [%d] %s\n", mysqli_errno($link), mysqli_error($link));
 	exit(1);
@@ -20,4 +25,4 @@ if (!mysqli_query($link, 'CREATE TABLE test(id INT, label CHAR(1), PRIMARY KEY(i
 if (!mysqli_query($link, "INSERT INTO test(id, label) VALUES (1, 'a'), (2, 'b'), (3, 'c'), (4, 'd'), (5, 'e'), (6, 'f')")) {
 	printf("[%d] %s\n",  mysqli_errno($link), mysqli_error($link));
 }
-?>
+?>

ext/mysqlnd/config9.m4

@@ -51,3 +51,29 @@ if test "$PHP_MYSQLND" != "no" || test "$PHP_MYSQLND_ENABLED" = "yes" || test "$
 #endif
   ])
 fi
+
+dnl
+dnl Check if the compiler supports Decimal32/64/128 types from the IEEE-754 2008 version
+dnl References: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1657.pdf
+dnl http://speleotrove.com/decimal/
+dnl
+AC_CACHE_CHECK([whether whether compiler supports Decimal32/64/128 types], ac_cv_decimal_fp_supported,[
+AC_TRY_RUN( [
+#include <stdio.h>
+
+int main(int argc, char **argv) {
+	typedef float dec32 __attribute__((mode(SD)));
+	dec32 k = 99.49f;
+	double d2 = (double)k;
+	return 0;
+}
+],[
+  ac_cv_decimal_fp_supported=yes
+],[
+  ac_cv_decimal_fp_supported=no
+],[
+  ac_cv_decimal_fp_supported=no
+])])
+if test "$ac_cv_decimal_fp_supported" = "yes"; then
+  AC_DEFINE(HAVE_DECIMAL_FP_SUPPORT, 1, [Define if the compiler supports Decimal32/64/128 types.])
+fi

ext/mysqlnd/mysqlnd_ps_codec.c

@@ -195,12 +195,53 @@ void ps_fetch_float(zval *zv, const MYSQLND_FIELD * const field,
 					unsigned int pack_len, zend_uchar **row,
 					zend_bool as_unicode TSRMLS_DC)
 {
-	float value;
+	float fval;
+	double dval;
 	DBG_ENTER("ps_fetch_float");
-	float4get(value, *row);
-	ZVAL_DOUBLE(zv, value);
+	float4get(fval, *row);
 	(*row)+= 4;
-	DBG_INF_FMT("value=%f", value);
+	DBG_INF_FMT("value=%f", fval);
+
+	/*
+	 * The following is needed to correctly support 4-byte floats.
+	 * Otherwise, a value of 9.99 in a FLOAT column comes out of mysqli
+	 * as 9.9998998641968.
+	 *
+	 * For GCC, we use the built-in decimal support to "up-convert" a
+	 * 4-byte float to a 8-byte double.
+	 * When that is not available, we fall back to converting the float
+	 * to a string and then converting the string to a double. This mimics
+	 * what MySQL does.
+	 */
+#ifdef HAVE_DECIMAL_FP_SUPPORT
+	{
+		typedef float dec32 __attribute__((mode(SD)));
+		dec32 d32val = fval;
+
+		/* The following cast is guaranteed to do the right thing */
+		dval = (double) d32val;
+	}
+#else
+	{
+		char num_buf[2048]; /* Over allocated */
+		char *s;
+
+		/* Convert to string. Ignoring localization, etc.
+		 * Following MySQL's rules. If precision is undefined (NOT_FIXED_DEC i.e. 31)
+		 * or larger than 31, the value is limited to 6 (FLT_DIG).
+		 */
+		s = php_gcvt(fval,
+			     field->decimals >= 31 ? 6 : field->decimals,
+			     '.',
+			     'e',
+			     num_buf);
+
+		/* And now convert back to double */
+		dval = zend_strtod(s, NULL);
+	}
+#endif
+
+	ZVAL_DOUBLE(zv, dval);
 	DBG_VOID_RETURN;
 }
 /* }}} */