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/* Copyright (c) 1993-2008 by Richard Kelsey and Jonathan Rees.
See file COPYING. */
/* Implementation of the vm-extension opcode. This is completely
optional; nothing in the standard system uses these features.
The vm-extension opcode is being phased out. New code should use the
external-call opcode to call C procedures.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <signal.h>
#include <errno.h>
#include "scheme48.h"
#define GREATEST_FIXNUM_VALUE S48_MAX_FIXNUM_VALUE
#define LEAST_FIXNUM_VALUE S48_MIN_FIXNUM_VALUE
#define CHANNEL_INDEX(x) EXTRACT_FIXNUM(STOB_REF(x, 1))
#define FOR_INPUT 1
#define FOR_OUTPUT 2
typedef struct {
char b[sizeof(double)];
} unaligned_double;
typedef union {
double f;
unaligned_double b;
} float_or_bytes;
extern long s48_Sextension_valueS; /* how values are returned */
/* return status values */
#define EXT_ST_OKAY 0
#define EXT_ST_EXCEPTION 1
#define EXT_RETURN(value) {s48_Sextension_valueS = (value); return EXT_ST_OKAY; }
#define EXT_EXCEPTION return EXT_ST_EXCEPTION
/******************************************/
s48_value
s48_extended_vm (long key, s48_value value)
{
double x, y;
switch (key) {
/* Cases 0 through 19 are reserved for the mobot system. */
case 0: /* read jumpers on 68000 board */
EXT_RETURN(S48_UNSAFE_ENTER_FIXNUM(0));
/* Floating point */
#define FLOP 100
#define FLOP2(i) case FLOP+(i): \
if (!S48_STOB_P(value) || S48_STOB_DESCRIPTOR_LENGTH(value) != 2) \
EXT_EXCEPTION;
#define FLOP3(i) case FLOP+(i): \
if (!S48_STOB_P(value) || S48_STOB_DESCRIPTOR_LENGTH(value) != 3) \
EXT_EXCEPTION;
#define get_arg(args,i) S48_STOB_REF(args,(i))
#define get_string_arg(args,i) (S48_UNSAFE_EXTRACT_STRING(get_arg(args,i)))
#define get_float_arg(args, i, var) EXTRACT_FLOAT(get_arg(args, i), var)
#define set_float_arg(args, i, val) SET_FLOAT(get_arg(args, i), val)
#define EXTRACT_FLOAT(stob, var) \
{ s48_value temp_ = (stob); \
float_or_bytes loser_; \
if (!S48_STOB_P(temp_)) EXT_EXCEPTION; \
loser_.b = *(unaligned_double*)(&S48_STOB_REF(temp_, 0)); \
(var) = loser_.f; }
#define SET_FLOAT(stob, val) \
{ s48_value temp_ = (stob); \
float_or_bytes loser_; \
if (!S48_STOB_P(temp_)) EXT_EXCEPTION; \
loser_.f = (double)(val); \
*(unaligned_double*)(&S48_STOB_REF(temp_, 0)) = loser_.b; }
FLOP2(0) { /* fixnum->float */
s48_value arg = get_arg(value, 0);
if (!S48_FIXNUM_P(arg)) EXT_RETURN(S48_FALSE);
set_float_arg(value, 1, S48_UNSAFE_EXTRACT_FIXNUM(arg));
EXT_RETURN(S48_TRUE);}
FLOP2(1) { /* string->float */
static char* buf = NULL;
static size_t max_size = 0;
size_t len = s48_string_length(get_arg(value, 0));
if (len + 1 > max_size)
{
max_size = ((len > 40) ? (len + 1) : 41);
buf = realloc(buf, max_size);
if (buf == NULL)
EXT_RETURN(S48_FALSE);
}
s48_copy_string_to_latin_1(get_arg(value, 0), buf);
buf[len] = '\0';
set_float_arg(value, 1, atof(buf));
EXT_RETURN(get_arg(value, 1));
}
FLOP2(2) { /* float->string */
extern size_t s48_double_to_string(char *buf, double v);
static char buf[40];
int i;
size_t len;
get_float_arg(value, 0, x);
len = s48_double_to_string(buf, x);
s48_copy_latin_1_to_string_n(buf, len, get_arg(value,1));
EXT_RETURN(S48_UNSAFE_ENTER_FIXNUM(len));
}
/* exp log sin cos tan asin acos atan1 atan2 sqrt */
FLOP2(3) {
get_float_arg(value, 0, x);
set_float_arg(value, 1, exp(x));
EXT_RETURN(S48_UNSPECIFIC);}
FLOP2(4) {
get_float_arg(value, 0, x);
set_float_arg(value, 1, log(x));
EXT_RETURN(S48_UNSPECIFIC);}
FLOP2(5) {
get_float_arg(value, 0, x);
set_float_arg(value, 1, sin(x));
EXT_RETURN(S48_UNSPECIFIC);}
FLOP2(6) {
get_float_arg(value, 0, x);
set_float_arg(value, 1, cos(x));
EXT_RETURN(S48_UNSPECIFIC);}
FLOP2(7) {
get_float_arg(value, 0, x);
set_float_arg(value, 1, tan(x));
EXT_RETURN(S48_UNSPECIFIC);}
FLOP2(8) {
get_float_arg(value, 0, x);
set_float_arg(value, 1, asin(x));
EXT_RETURN(S48_UNSPECIFIC);}
FLOP2(9) {
get_float_arg(value, 0, x);
set_float_arg(value, 1, acos(x));
EXT_RETURN(S48_UNSPECIFIC);}
FLOP2(10) { /* atan 1 */
get_float_arg(value, 0, x);
set_float_arg(value, 1, atan(x));
EXT_RETURN(S48_UNSPECIFIC);}
FLOP3(11) { /* atan 2 */
get_float_arg(value, 0, y);
get_float_arg(value, 1, x);
set_float_arg(value, 2, atan2(y, x));
EXT_RETURN(S48_UNSPECIFIC);}
FLOP2(12) {
get_float_arg(value, 0, x);
set_float_arg(value, 1, sqrt(x));
EXT_RETURN(S48_UNSPECIFIC);}
FLOP2(13) { /* floor */
get_float_arg(value, 0, x);
set_float_arg(value, 1, floor(x));
EXT_RETURN(S48_UNSPECIFIC);}
case FLOP+14: { /* integer? */
EXTRACT_FLOAT(value, x);
EXT_RETURN(S48_ENTER_BOOLEAN(fmod(x, 1.0) == 0.0)); }
case FLOP+15: { /* float->fixnum */
EXTRACT_FLOAT(value, x);
if (x <= (double)GREATEST_FIXNUM_VALUE
&& x >= (double)LEAST_FIXNUM_VALUE)
{
EXT_RETURN(S48_UNSAFE_ENTER_FIXNUM((long)x)); }
else
EXT_RETURN(S48_FALSE);}
FLOP3(16) { /* quotient */
double z;
get_float_arg(value, 0, x);
get_float_arg(value, 1, y);
if (fmod(x, 1.0) != 0.0 || fmod(y, 1.0) != 0.0) EXT_EXCEPTION;
if (y == 0.0) EXT_EXCEPTION;
z = x / y;
set_float_arg(value, 2, z < 0.0 ? ceil(z) : floor(z));
EXT_RETURN(S48_UNSPECIFIC);}
FLOP3(17) { /* remainder */
get_float_arg(value, 0, x);
get_float_arg(value, 1, y);
if (fmod(x, 1.0) != 0.0 || fmod(y, 1.0) != 0.0) EXT_EXCEPTION;
if (y == 0.0) EXT_EXCEPTION;
/* "fmod(double x, double y) returns the floating-point remainder
(f) of the division of x by y, where f has the same sign as x,
such that x=iy+f for some integer i, and |f| < |y|." */
set_float_arg(value, 2, fmod(x, y));
EXT_RETURN(S48_UNSPECIFIC);}
default:
EXT_EXCEPTION;
}
}
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