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php-src/ext/standard/math.c
Sascha Schumann 39691bed9e conv_proto *.[ch]
1999-05-16 11:19:26 +00:00

696 lines
16 KiB
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/*
+----------------------------------------------------------------------+
| PHP HTML Embedded Scripting Language Version 3.0 |
+----------------------------------------------------------------------+
| Copyright (c) 1997,1998 PHP Development Team (See Credits file) |
+----------------------------------------------------------------------+
| This program is free software; you can redistribute it and/or modify |
| it under the terms of one of the following licenses: |
| |
| A) the GNU General Public License as published by the Free Software |
| Foundation; either version 2 of the License, or (at your option) |
| any later version. |
| |
| B) the PHP License as published by the PHP Development Team and |
| included in the distribution in the file: LICENSE |
| |
| This program 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 General Public License for more details. |
| |
| You should have received a copy of both licenses referred to here. |
| If you did not, or have any questions about PHP licensing, please |
| contact core@php.net. |
+----------------------------------------------------------------------+
| Authors: Jim Winstead (jimw@php.net) |
| Stig Sæther Bakken <ssb@guardian.no> |
+----------------------------------------------------------------------+
*/
#include "php.h"
#include "phpmath.h"
#include "snprintf.h"
#include <math.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
char *_php3_number_format(double, int, char ,char);
/* {{{ proto int abs(int number)
Return the absolute value of the number */
PHP_FUNCTION(abs) {
pval *value;
if (ARG_COUNT(ht)!=1||getParameters(ht,1,&value)==FAILURE) {
WRONG_PARAM_COUNT;
}
if (value->type == IS_STRING) {
convert_scalar_to_number(value);
}
if (value->type == IS_DOUBLE) {
RETURN_DOUBLE(fabs(value->value.dval));
}
else if (value->type == IS_LONG) {
RETURN_LONG(labs(value->value.lval));
}
RETURN_FALSE;
}
/* }}} */
/* {{{ proto int ceil(double number)
Returns the next highest integer value of the number */
PHP_FUNCTION(ceil) {
pval *value;
if (ARG_COUNT(ht)!=1||getParameters(ht,1,&value)==FAILURE) {
WRONG_PARAM_COUNT;
}
if (value->type == IS_STRING) {
convert_scalar_to_number(value);
}
if (value->type == IS_DOUBLE) {
RETURN_LONG((long)ceil(value->value.dval));
}
else if (value->type == IS_LONG) {
RETURN_LONG(value->value.lval);
}
RETURN_FALSE;
}
/* }}} */
/* {{{ proto int floor(double number)
Returns the next lowest integer value from the number */
PHP_FUNCTION(floor) {
pval *value;
if (ARG_COUNT(ht)!=1||getParameters(ht,1,&value)==FAILURE) {
WRONG_PARAM_COUNT;
}
if (value->type == IS_STRING) {
convert_scalar_to_number(value);
}
if (value->type == IS_DOUBLE) {
RETURN_LONG((long)floor(value->value.dval));
}
else if (value->type == IS_LONG) {
RETURN_LONG(value->value.lval);
}
RETURN_FALSE;
}
/* }}} */
#ifndef HAVE_RINT
/* emulate rint */
inline double rint(double n)
{
double i, f;
f = modf(n, &i);
if (f > .5)
i++;
else if (f < -.5)
i--;
return i;
}
#endif
/* {{{ proto int round(double number)
Returns the rounded value of the number */
PHP_FUNCTION(round)
{
pval *value;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &value) == FAILURE) {
WRONG_PARAM_COUNT;
}
if (value->type == IS_STRING) {
convert_scalar_to_number(value);
}
if (value->type == IS_DOUBLE) {
RETURN_DOUBLE(rint(value->value.dval));
}
if (value->type == IS_LONG) {
RETURN_DOUBLE((double)value->value.lval);
}
RETURN_FALSE;
}
/* }}} */
/* {{{ proto double sin(double number)
Returns the sine of the number in radians */
PHP_FUNCTION(sin)
{
pval *num;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &num) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_double(num);
return_value->value.dval = sin(num->value.dval);
return_value->type = IS_DOUBLE;
}
/* }}} */
/* {{{ proto double cos(double number)
Returns the cosine of the number in radians */
PHP_FUNCTION(cos)
{
pval *num;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &num) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_double(num);
return_value->value.dval = cos(num->value.dval);
return_value->type = IS_DOUBLE;
}
/* }}} */
/* {{{ proto double tan(double number)
Returns the tangent of the number in radians */
PHP_FUNCTION(tan)
{
pval *num;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &num) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_double(num);
return_value->value.dval = tan(num->value.dval);
return_value->type = IS_DOUBLE;
}
/* }}} */
/* {{{ proto double asin(double number)
Returns the arc sine of the number in radians */
PHP_FUNCTION(asin)
{
pval *num;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &num) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_double(num);
return_value->value.dval = asin(num->value.dval);
return_value->type = IS_DOUBLE;
}
/* }}} */
/* {{{ proto double acos(double number)
Return the arc cosine of the number in radians */
PHP_FUNCTION(acos)
{
pval *num;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &num) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_double(num);
return_value->value.dval = acos(num->value.dval);
return_value->type = IS_DOUBLE;
}
/* }}} */
/* {{{ proto double atan(double number)
Returns the arc tangent of the number in radians */
PHP_FUNCTION(atan)
{
pval *num;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &num) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_double(num);
return_value->value.dval = atan(num->value.dval);
return_value->type = IS_DOUBLE;
}
/* }}} */
/* {{{ proto double atan2(double y, double x)
Returns the arc tangent of y/x, with the resulting quadrant determined by the signs of y and x */
PHP_FUNCTION(atan2)
{
pval *num1, *num2;
if (ARG_COUNT(ht) != 2 || getParameters(ht, 2, &num1, &num2) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_double(num1);
convert_to_double(num2);
return_value->value.dval = atan2(num1->value.dval,num2->value.dval);
return_value->type = IS_DOUBLE;
}
/* }}} */
/* {{{ proto double pi(void)
Returns an approximation of pi */
PHP_FUNCTION(pi)
{
return_value->value.dval = M_PI;
return_value->type = IS_DOUBLE;
}
/* }}} */
/* {{{ proto double pow(double base, double exponent)
Returns base raised to the power of expopent */
PHP_FUNCTION(pow)
{
pval *num1, *num2;
if (ARG_COUNT(ht) != 2 || getParameters(ht,2,&num1,&num2) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_double(num1);
convert_to_double(num2);
RETURN_DOUBLE(pow(num1->value.dval, num2->value.dval));
}
/* }}} */
/* {{{ proto double exp(double number)
Returns e raised to the power of the number */
PHP_FUNCTION(exp)
{
pval *num;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &num) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_double(num);
return_value->value.dval = exp(num->value.dval);
return_value->type = IS_DOUBLE;
}
/* }}} */
/* {{{ proto double log(double number)
Returns the natural logarithm of the number */
PHP_FUNCTION(log)
{
pval *num;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &num) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_double(num);
return_value->value.dval = log(num->value.dval);
return_value->type = IS_DOUBLE;
}
/* }}} */
/* {{{ proto double log10(double number)
Returns the base-10 logarithm of the number */
PHP_FUNCTION(log10)
{
pval *num;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &num) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_double(num);
return_value->value.dval = log10(num->value.dval);
return_value->type = IS_DOUBLE;
}
/* }}} */
/* {{{ proto double sqrt(double number)
Returns the square root of the number */
PHP_FUNCTION(sqrt)
{
pval *num;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &num) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_double(num);
return_value->value.dval = sqrt(num->value.dval);
return_value->type = IS_DOUBLE;
}
/* }}} */
/* {{{ proto double deg2rad(double number)
Converts the number in degrees to the radian equivalent */
PHP_FUNCTION(deg2rad)
{
pval *deg;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &deg) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_double(deg);
RETVAL_DOUBLE((deg->value.dval / 180.0) * M_PI);
}
/* }}} */
/* {{{ proto double rad2deg(double number)
Converts the radian number to the equivalent number in degrees */
PHP_FUNCTION(rad2deg)
{
pval *rad;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &rad) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_double(rad);
RETVAL_DOUBLE((rad->value.dval / M_PI) * 180);
}
/* }}} */
/*
* Convert a string representation of a base(2-36) number to a long.
*/
static long
_php3_basetolong(pval *arg, int base) {
long mult = 1, num = 0, digit;
int i;
char c, *s;
if (arg->type != IS_STRING || base < 2 || base > 36) {
return 0;
}
s = arg->value.str.val;
for (i = arg->value.str.len - 1; i >= 0; i--, mult *= base) {
c = toupper(s[i]);
if (c >= '0' && c <= '9') {
digit = (c - '0');
} else if (c >= 'A' && c <= 'Z') {
digit = (c - 'A' + 10);
} else {
continue;
}
if (digit >= base) {
continue;
}
num += mult * digit;
}
return num;
}
/*
* Convert a long to a string containing a base(2-36) representation of
* the number.
*/
static char *
_php3_longtobase(pval *arg, int base)
{
static char digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
char *result, *ptr, *ret;
int len, digit;
long value;
if (arg->type != IS_LONG || base < 2 || base > 36) {
return empty_string;
}
value = arg->value.lval;
/* allocates space for the longest possible result with the lowest base */
len = (sizeof(arg->value.lval) * 8) + 1;
result = emalloc((sizeof(arg->value.lval) * 8) + 1);
ptr = result + len - 1;
*ptr-- = '\0';
do {
digit = value % base;
*ptr = digits[digit];
value /= base;
}
while (ptr-- > result && value);
ptr++;
ret = estrdup(ptr);
efree(result);
return ret;
}
/* {{{ proto int bindec(string binary_number)
Returns the decimal equivalent of the binary number */
PHP_FUNCTION(bindec)
{
pval *arg;
long ret;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &arg) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_string(arg);
ret = _php3_basetolong(arg, 2);
RETVAL_LONG(ret);
}
/* }}} */
/* {{{ proto int hexdec(string hexadimal_number)
Returns the decimal equivalent of the hexadecimal number */
PHP_FUNCTION(hexdec)
{
pval *arg;
long ret;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &arg) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_string(arg);
ret = _php3_basetolong(arg, 16);
RETVAL_LONG(ret);
}
/* }}} */
/* {{{ proto int octdec(string octal_number)
Returns the decimal equivalent of an octal string */
PHP_FUNCTION(octdec)
{
pval *arg;
long ret;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &arg) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_string(arg);
ret = _php3_basetolong(arg, 8);
RETVAL_LONG(ret);
}
/* }}} */
/* {{{ proto string decbin(int decimal_number)
Returns a string containing a binary representation of the number */
PHP_FUNCTION(decbin)
{
pval *arg;
char *result;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &arg) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_long(arg);
result = _php3_longtobase(arg, 2);
return_value->type = IS_STRING;
return_value->value.str.len = strlen(result);
return_value->value.str.val = result;
}
/* }}} */
/* {{{ proto string decoct(int decimal_number)
Returns a string containing an octal representation of the given number */
PHP_FUNCTION(decoct)
{
pval *arg;
char *result;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &arg) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_long(arg);
result = _php3_longtobase(arg, 8);
return_value->type = IS_STRING;
return_value->value.str.len = strlen(result);
return_value->value.str.val = result;
}
/* }}} */
/* {{{ proto string dechex(int decimal_number)
Returns a string containing a hexadecimal representation of the given number */
PHP_FUNCTION(dechex)
{
pval *arg;
char *result;
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &arg) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_long(arg);
result = _php3_longtobase(arg, 16);
return_value->type = IS_STRING;
return_value->value.str.len = strlen(result);
return_value->value.str.val = result;
}
/* }}} */
/* {{{ proto string base_convert(string number, int frombase, int tobase)
Converts a number in a string from any base <= 36 to any base <= 36.
*/
PHP_FUNCTION(base_convert)
{
pval *number, *frombase, *tobase, temp;
char *result;
if (ARG_COUNT(ht) != 3 || getParameters(ht, 3, &number, &frombase, &tobase)
== FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_string(number);
convert_to_long(frombase);
convert_to_long(tobase);
if (frombase->value.lval < 2 || frombase->value.lval > 36) {
php3_error(E_WARNING, "base_convert: invalid `from base' (%d)",
frombase->value.lval);
RETURN_FALSE;
}
if (tobase->value.lval < 2 || tobase->value.lval > 36) {
php3_error(E_WARNING, "base_convert: invalid `to base' (%d)",
tobase->value.lval);
RETURN_FALSE;
}
temp.type = IS_LONG;
temp.value.lval = _php3_basetolong(number, frombase->value.lval);
result = _php3_longtobase(&temp, tobase->value.lval);
RETVAL_STRING(result, 0);
} /* }}} */
char *_php3_number_format(double d,int dec,char dec_point,char thousand_sep)
{
char *tmpbuf,*resbuf;
char *s,*t; /* source, target */
int tmplen,reslen=0;
int count=0;
int is_negative=0;
if (d<0) {
is_negative=1;
d = -d;
}
dec = MAX(0,dec);
tmpbuf = (char *) emalloc(32+dec);
tmplen=_php3_sprintf(tmpbuf,"%.*f",dec,d);
for (t=tmpbuf; *t; t++) {
if (*t=='.') {
*t = dec_point;
}
}
if (dec) {
reslen = dec+1 + (tmplen-dec-1) + (tmplen-1-dec-1)/3;
} else {
reslen = tmplen+(tmplen-1)/3;
}
if (is_negative) {
reslen++;
}
resbuf = (char *) emalloc(reslen+1);
s = tmpbuf+tmplen-1;
t = resbuf+reslen;
*t-- = 0;
if (dec) {
while (*s!=dec_point) {
*t-- = *s--;
}
*t-- = *s--; /* copy that dot */
}
while(s>=tmpbuf) {
*t-- = *s--;
if ((++count%3)==0 && s>=tmpbuf) {
*t-- = thousand_sep;
}
}
if (is_negative) {
*t-- = '-';
}
efree(tmpbuf);
return resbuf;
}
/* {{{ proto string number_format(double number, [,int num_decimal_places [, string dec_seperator, string thousands_seperator)]])
Formats a number with grouped thousands */
PHP_FUNCTION(number_format)
{
pval *num,*dec,*t_s,*d_p;
char thousand_sep=',', dec_point='.';
switch(ARG_COUNT(ht)) {
case 1:
if (getParameters(ht, 1, &num)==FAILURE) {
RETURN_FALSE;
}
convert_to_double(num);
RETURN_STRING(_php3_number_format(num->value.dval,0,dec_point,thousand_sep),0);
break;
case 2:
if (getParameters(ht, 2, &num, &dec)==FAILURE) {
RETURN_FALSE;
}
convert_to_double(num);
convert_to_long(dec);
RETURN_STRING(_php3_number_format(num->value.dval,dec->value.lval,dec_point,thousand_sep),0);
break;
case 4:
if (getParameters(ht, 4, &num, &dec, &d_p, &t_s)==FAILURE) {
RETURN_FALSE;
}
convert_to_double(num);
convert_to_long(dec);
convert_to_string(d_p);
convert_to_string(t_s);
if (d_p->value.str.len==1) {
dec_point=d_p->value.str.val[0];
}
if (t_s->value.str.len==1) {
thousand_sep=t_s->value.str.val[0];
}
RETURN_STRING(_php3_number_format(num->value.dval,dec->value.lval,dec_point,thousand_sep),0);
break;
default:
WRONG_PARAM_COUNT;
break;
}
}
/* }}} */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
*/
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