mysql_float_to_double.h

/*
 +----------------------------------------------------------------------+
 | 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> |
 +----------------------------------------------------------------------+
*/

#ifndefMYSQL_FLOAT_TO_DOUBLE_H
#defineMYSQL_FLOAT_TO_DOUBLE_H

#include"main/php.h"
#include<float.h>
#include"main/snprintf.h"

#defineMAX_CHAR_BUF_LEN 255

#ifndefFLT_DIG
# defineFLT_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.
 */
staticinlinedoublemysql_float_to_double(floatfp4, intdecimals) {
charnum_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);
 }

returnzend_strtod(num_buf, NULL);
}

#endif/* MYSQL_FLOAT_TO_DOUBLE_H */