1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 2006-2016 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Authors: Keyur Govande <kgovande@gmail.com> |
16 +----------------------------------------------------------------------+
17 */
18
19 #ifndef MYSQL_FLOAT_TO_DOUBLE_H
20 #define MYSQL_FLOAT_TO_DOUBLE_H
21
22 #include "main/php.h"
23 #include <float.h>
24 #include "main/snprintf.h"
25
26 #define MAX_CHAR_BUF_LEN 255
27
28 #ifndef FLT_DIG
29 # define FLT_DIG 6
30 #endif
31
32 /*
33 * Convert from a 4-byte float to a 8-byte decimal by first converting
34 * the float to a string, and then the string to a double.
35 * The decimals argument specifies the precision of the output. If decimals
36 * is less than zero, then a gcvt(3) like logic is used with the significant
37 * digits set to FLT_DIG i.e. 6.
38 */
39 static inline double mysql_float_to_double(float fp4, int decimals) {
40 char num_buf[MAX_CHAR_BUF_LEN]; /* Over allocated */
41
42 if (decimals < 0) {
43 php_gcvt(fp4, FLT_DIG, '.', 'e', num_buf);
44 } else {
45 php_sprintf(num_buf, "%.*f", decimals, fp4);
46 }
47
48 return zend_strtod(num_buf, NULL);
49 }
50
51 /*
52 * Local variables:
53 * tab-width: 4
54 * c-basic-offset: 4
55 * End:
56 * vim600: noet sw=4 ts=4 fdm=marker
57 * vim<600: noet sw=4 ts=4
58 */
59
60 #endif /* MYSQL_FLOAT_TO_DOUBLE_H */