name : 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> | +----------------------------------------------------------------------+ */ #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 */