1 /*
2 +----------------------------------------------------------------------+
3 | Copyright (c) The PHP Group |
4 +----------------------------------------------------------------------+
5 | This source file is subject to version 3.01 of the PHP license, |
6 | that is bundled with this package in the file LICENSE, and is |
7 | available through the world-wide-web at the following url: |
8 | https://www.php.net/license/3_01.txt |
9 | If you did not receive a copy of the PHP license and are unable to |
10 | obtain it through the world-wide-web, please send a note to |
11 | license@php.net so we can mail you a copy immediately. |
12 +----------------------------------------------------------------------+
13 | Authors: Keyur Govande <kgovande@gmail.com> |
14 +----------------------------------------------------------------------+
15 */
16
17 #ifndef MYSQL_FLOAT_TO_DOUBLE_H
18 #define MYSQL_FLOAT_TO_DOUBLE_H
19
20 #include "main/php.h"
21 #include <float.h>
22 #include "main/snprintf.h"
23
24 #define MAX_CHAR_BUF_LEN 255
25
26 #ifndef FLT_DIG
27 # define FLT_DIG 6
28 #endif
29
30 /*
31 * Convert from a 4-byte float to a 8-byte decimal by first converting
32 * the float to a string (ignoring localization), and then the string to a double.
33 * The decimals argument specifies the precision of the output. If decimals
34 * is less than zero, then a gcvt(3) like logic is used with the significant
35 * digits set to FLT_DIG i.e. 6.
36 */
mysql_float_to_double(float fp4,int decimals)37 static inline double mysql_float_to_double(float fp4, int decimals) {
38 char num_buf[MAX_CHAR_BUF_LEN]; /* Over allocated */
39
40 if (decimals < 0) {
41 zend_gcvt(fp4, FLT_DIG, '.', 'e', num_buf);
42 } else {
43 snprintf(num_buf, MAX_CHAR_BUF_LEN, "%.*F", decimals, fp4);
44 }
45
46 return zend_strtod(num_buf, NULL);
47 }
48
49 #endif /* MYSQL_FLOAT_TO_DOUBLE_H */
50
