mirror of
https://github.com/php/php-src.git
synced 2026-04-07 16:13:32 +02:00
e56ed6e1ab
Re-formats the BCmath extension to have consistent formatting. Mostly, it adds the spaces in calculations to have them more readable. Also: - removes unused headers - removes few variables which are used only once in the code Co-authored-by: George Peter Banyard <girgias@php.net>
134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
/* str2num.c: bcmath library file. */
|
|
/*
|
|
Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
|
|
Copyright (C) 2000 Philip A. Nelson
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2 of the License, or (at your option) any later version.
|
|
|
|
This library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details. (LICENSE)
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with this library; if not, write to:
|
|
|
|
The Free Software Foundation, Inc.
|
|
59 Temple Place, Suite 330
|
|
Boston, MA 02111-1307 USA.
|
|
|
|
You may contact the author by:
|
|
e-mail: philnelson@acm.org
|
|
us-mail: Philip A. Nelson
|
|
Computer Science Department, 9062
|
|
Western Washington University
|
|
Bellingham, WA 98226-9062
|
|
|
|
*************************************************************************/
|
|
|
|
#include "bcmath.h"
|
|
#include <stdbool.h>
|
|
#include <stddef.h>
|
|
|
|
/* Convert strings to bc numbers. Base 10 only.*/
|
|
|
|
bool bc_str2num(bc_num *num, char *str, size_t scale)
|
|
{
|
|
size_t digits = 0;
|
|
size_t strscale = 0;
|
|
char *ptr, *nptr;
|
|
size_t trailing_zeros = 0;
|
|
bool zero_int = false;
|
|
|
|
/* Prepare num. */
|
|
bc_free_num (num);
|
|
|
|
/* Check for valid number and count digits. */
|
|
ptr = str;
|
|
|
|
if ((*ptr == '+') || (*ptr == '-')) {
|
|
/* Skip Sign */
|
|
ptr++;
|
|
}
|
|
/* Skip leading zeros. */
|
|
while (*ptr == '0') {
|
|
ptr++;
|
|
}
|
|
/* digits before the decimal point */
|
|
while (*ptr >= '0' && *ptr <= '9') {
|
|
ptr++;
|
|
digits++;
|
|
}
|
|
/* decimal point */
|
|
if (*ptr == '.') {
|
|
ptr++;
|
|
}
|
|
/* digits after the decimal point */
|
|
while (*ptr >= '0' && *ptr <= '9') {
|
|
if (*ptr == '0') {
|
|
trailing_zeros++;
|
|
} else {
|
|
trailing_zeros = 0;
|
|
}
|
|
ptr++;
|
|
strscale++;
|
|
}
|
|
|
|
if (trailing_zeros > 0) {
|
|
/* Trailing zeros should not take part in the computation of the overall scale, as it is pointless. */
|
|
strscale = strscale - trailing_zeros;
|
|
}
|
|
if ((*ptr != '\0') || (digits + strscale == 0)) {
|
|
*num = bc_copy_num(BCG(_zero_));
|
|
return *ptr == '\0';
|
|
}
|
|
|
|
/* Adjust numbers and allocate storage and initialize fields. */
|
|
strscale = MIN(strscale, scale);
|
|
if (digits == 0) {
|
|
zero_int = true;
|
|
digits = 1;
|
|
}
|
|
*num = bc_new_num (digits, strscale);
|
|
|
|
/* Build the whole number. */
|
|
ptr = str;
|
|
if (*ptr == '-') {
|
|
(*num)->n_sign = MINUS;
|
|
ptr++;
|
|
} else {
|
|
(*num)->n_sign = PLUS;
|
|
if (*ptr == '+') ptr++;
|
|
}
|
|
/* Skip leading zeros. */
|
|
while (*ptr == '0') {
|
|
ptr++;
|
|
}
|
|
nptr = (*num)->n_value;
|
|
if (zero_int) {
|
|
*nptr++ = 0;
|
|
digits = 0;
|
|
}
|
|
for (; digits > 0; digits--) {
|
|
*nptr++ = CH_VAL(*ptr++);
|
|
}
|
|
|
|
/* Build the fractional part. */
|
|
if (strscale > 0) {
|
|
/* skip the decimal point! */
|
|
ptr++;
|
|
for (; strscale > 0; strscale--) {
|
|
*nptr++ = CH_VAL(*ptr++);
|
|
}
|
|
}
|
|
|
|
if (bc_is_zero(*num)) {
|
|
(*num)->n_sign = PLUS;
|
|
}
|
|
|
|
return true;
|
|
}
|