mirror of
https://github.com/php/php-src.git
synced 2024-09-21 18:07:23 +00:00
50 lines
1.8 KiB
C
50 lines
1.8 KiB
C
/*
|
|
+----------------------------------------------------------------------+
|
|
| Copyright (c) The PHP Group |
|
|
+----------------------------------------------------------------------+
|
|
| This source file is subject to version 3.01 of the PHP license, |
|
|
| that is bundled with this package in the file LICENSE, and is |
|
|
| available through the world-wide-web at the following url: |
|
|
| https://www.php.net/license/3_01.txt |
|
|
| If you did not receive a copy of the PHP license and are unable to |
|
|
| obtain it through the world-wide-web, please send a note to |
|
|
| license@php.net so we can mail you a copy immediately. |
|
|
+----------------------------------------------------------------------+
|
|
| Authors: Keyur Govande <kgovande@gmail.com> |
|
|
+----------------------------------------------------------------------+
|
|
*/
|
|
|
|
#ifndef MYSQL_FLOAT_TO_DOUBLE_H
|
|
#define MYSQL_FLOAT_TO_DOUBLE_H
|
|
|
|
#include "main/php.h"
|
|
#include <float.h>
|
|
#include "main/snprintf.h"
|
|
|
|
#define MAX_CHAR_BUF_LEN 255
|
|
|
|
#ifndef FLT_DIG
|
|
# define FLT_DIG 6
|
|
#endif
|
|
|
|
/*
|
|
* Convert from a 4-byte float to a 8-byte decimal by first converting
|
|
* the float to a string (ignoring localization), and then the string to a double.
|
|
* The decimals argument specifies the precision of the output. If decimals
|
|
* is less than zero, then a gcvt(3) like logic is used with the significant
|
|
* digits set to FLT_DIG i.e. 6.
|
|
*/
|
|
static inline double mysql_float_to_double(float fp4, int decimals) {
|
|
char num_buf[MAX_CHAR_BUF_LEN]; /* Over allocated */
|
|
|
|
if (decimals < 0) {
|
|
zend_gcvt(fp4, FLT_DIG, '.', 'e', num_buf);
|
|
} else {
|
|
snprintf(num_buf, MAX_CHAR_BUF_LEN, "%.*F", decimals, fp4);
|
|
}
|
|
|
|
return zend_strtod(num_buf, NULL);
|
|
}
|
|
|
|
#endif /* MYSQL_FLOAT_TO_DOUBLE_H */
|