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function.c
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/*
* ISLisp standard builtin functions.
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <math.h>
#include <float.h>
#include <time.h>
#include <dlfcn.h>
#include <limits.h>
#include <unistd.h>
#include "eisl.h"
#include "mem.h"
#include "fmt.h"
#include "except.h"
#include "str.h"
#include "text.h"
#define BININT_LEN 64
#ifndef LINE_MAX
#define LINE_MAX 2048
#endif
void init_subr(void)
{
/* constant */
bind_const("*PI*", make_flt(M_PI));
bind_const("*MOST-POSITIVE-FLOAT*", make_flt(DBL_MAX));
bind_const("*MOST-NEGATIVE-FLOAT*", make_flt(-DBL_MAX));
bind_const("*POSITIVE-INFINITY*", make_flt(INFINITY));
bind_const("*NEGATIVE-INFINITY*", make_flt(-INFINITY));
/* function */
def_subr("-", f_minus);
def_subr("*", f_mult);
def_subr("/=", f_notnumeqp);
def_subr("+", f_plus);
def_subr("<", f_smaller);
def_subr("<=", f_eqsmaller);
def_subr("=", f_numeqp);
def_subr(">", f_greater);
def_subr(">=", f_eqgreater);
def_subr("ABS", f_abs);
def_subr("APPEND", f_append);
def_subr("APPLY", f_apply);
def_subr("AREF", f_aref);
def_subr("ARITHMETIC-ERROR-OPERANDS", f_arithmetic_error_operands);
def_subr("ARITHMETIC-ERROR-OPERATION", f_arithmetic_error_operation);
def_subr("ARRAY-DIMENSIONS", f_array_dimensions);
def_subr("ASSOC", f_assoc);
def_subr("ATAN", f_atan);
def_subr("ATAN2", f_atan2);
def_subr("ATANH", f_atanh);
def_subr("ATOM", f_atomp);
def_subr("BASIC-ARRAY-P", f_basic_array_p);
def_subr("BASIC-ARRAY*-P", f_basic_array_star_p);
def_subr("BASIC-VECTOR-P", f_basic_vector_p);
def_subr("CALL-NEXT-METHOD", f_call_next_method);
def_subr("CAR", f_car);
def_subr("CDR", f_cdr);
def_subr("CEILING", f_ceiling);
def_subr("CERROR", f_cerror);
def_subr("CHAR-INDEX", f_char_index);
def_subr("CHAR/=", f_char_noteqp);
def_subr("CHAR<", f_char_smallerp);
def_subr("CHAR<=", f_char_eqsmallerp);
def_subr("CHAR=", f_char_eqp);
def_subr("CHAR>", f_char_greaterp);
def_subr("CHAR>=", f_char_eqgreaterp);
def_subr("CHARACTERP", f_characterp);
def_subr("CLASS-OF", f_class_of);
def_subr("CLOSE", f_close);
def_subr("CONDITION-CONTINUABLE", f_condition_continuable);
def_subr("CONS", f_cons);
def_subr("CONSP", f_consp);
def_subr("CONTINUE-CONDITION", f_continue_condition);
def_subr("COS", f_cos);
def_subr("COSH", f_cosh);
def_subr("CREATE-ARRAY", f_create_array);
def_subr("CREATE-LIST", f_create_list);
def_subr("CREATE-STRING-INPUT-STREAM", f_create_string_input_stream);
def_subr("CREATE-STRING-OUTPUT-STREAM", f_create_string_output_stream);
def_subr("CREATE-STRING", f_create_string);
def_subr("CREATE-VECTOR", f_create_vector);
def_subr("CREATE*", f_create_star);
def_subr("DIV", f_div);
def_subr("DOMAIN-ERROR-OBJECT", f_domain_error_object);
def_subr("DOMAIN-ERROR-EXPECTED-CLASS", f_domain_error_expected_class);
def_subr("ELT", f_elt);
def_subr("EQ", f_eq);
def_subr("EQL", f_eql);
def_subr("EQUAL", f_equal);
def_subr("ERROR-OUTPUT", f_error_output);
def_subr("ERROR", f_error);
def_subr("EVAL", f_eval);
def_subr("EXP", f_exp);
def_subr("EXPT", f_expt);
def_subr("FILE-LENGTH", f_file_length);
def_subr("FILE-POSITION", f_file_position);
def_subr("FINISH-OUTPUT", f_finish_output);
def_subr("FLOAT", f_float);
def_subr("FLOATP", f_floatp);
def_subr("FLOOR", f_floor);
def_subr("FORMAT-CHAR", f_format_char);
def_subr("FORMAT-FRESH-LINE", f_format_fresh_line);
def_subr("FORMAT-FLOAT", f_format_float);
def_subr("FORMAT-INTEGER", f_format_integer);
def_subr("FORMAT-OBJECT", f_format_object);
def_subr("FORMAT-TAB", f_format_tab);
def_subr("FORMAT", f_format);
def_subr("FUNCALL", f_funcall);
def_subr("FUNCTIONP", f_functionp);
def_subr("GAREF", f_garef);
def_subr("GBC", f_gbc);
def_subr("GCD", f_gcd);
def_subr("GENERAL-ARRAY*-P", f_general_array_star_p);
def_subr("GENERAL-VECTOR-P", f_general_vector_p);
def_subr("GENERIC-FUNCTION-P", f_generic_function_p);
def_subr("GENSYM", f_gensym);
def_subr("GET-INTERNAL-RUN-TIME", f_get_internal_run_time);
def_subr("GET-INTERNAL-REAL-TIME", f_get_internal_real_time);
def_subr("GET-OUTPUT-STREAM-STRING", f_get_output_stream_string);
def_subr("GET-UNIVERSAL-TIME", f_get_universal_time);
def_subr("IDENTITY", f_identity);
def_subr("INITIALIZE-OBJECT*", f_initialize_object_star);
def_subr("INPUT-STREAM-P", f_input_stream_p);
def_subr("INSTANCEP", f_instancep);
def_subr("INTEGERP", f_integerp);
def_subr("INTERNAL-TIME-UNITS-PER-SECOND",
f_internal_time_units_per_second);
def_subr("ISQRT", f_isqrt);
def_subr("LCM", f_lcm);
def_subr("LENGTH", f_length);
def_subr("LIST", f_list);
def_subr("LISTP", f_listp);
def_subr("LOAD", f_load);
def_subr("LOG", f_log);
def_subr("MAP-INTO", f_map_into);
def_subr("MAPC", f_mapc);
def_subr("MAPCAR", f_mapcar);
def_subr("MAPCAN", f_mapcan);
def_subr("MAPCON", f_mapcon);
def_subr("MAPL", f_mapl);
def_subr("MAPLIST", f_maplist);
def_subr("MAX", f_max);
def_subr("MEMBER", f_member);
def_subr("MIN", f_min);
def_subr("MOD", f_mod);
def_subr("NEXT-METHOD-P", f_next_method_p);
def_subr("NOT", f_not);
def_subr("NREVERSE", f_nreverse);
def_subr("NULL", f_nullp);
def_subr("NUMBERP", f_numberp);
def_subr("OPEN-INPUT-FILE", f_open_input_file);
def_subr("OPEN-IO-FILE", f_open_io_file);
def_subr("OPEN-OUTPUT-FILE", f_open_output_file);
def_subr("OPEN-STREAM-P", f_open_stream_p);
def_subr("OUTPUT-STREAM-P", f_output_stream_p);
def_subr("PARSE-ERROR-STRING", f_parse_error_string);
def_subr("PARSE-ERROR-EXPECTED-CLASS", f_parse_error_expected_class);
def_subr("PARSE-NUMBER", f_parse_number);
def_subr("PREVIEW-CHAR", f_preview_char);
def_subr("PRINT", f_print);
def_subr("PROBE-FILE", f_probe_file);
def_subr("PROPERTY", f_property);
def_subr("QUIT", f_quit);
def_subr("QUOTIENT", f_quotient);
def_subr("READ-BYTE", f_read_byte);
def_subr("READ-CHAR", f_read_char);
def_subr("READ-LINE", f_read_line);
def_subr("READ", f_read);
def_subr("RECIPROCAL", f_reciprocal);
def_subr("REMOVE-PROPERTY", f_remove_property);
def_subr("REVERSE", f_reverse);
def_subr("ROUND", f_round);
def_subr("SET-AREF", f_set_aref);
def_subr("SET-CAR", f_set_car);
def_subr("SET-CDR", f_set_cdr);
def_subr("SET-ELT", f_set_elt);
def_subr("SET-FILE-POSITION", f_set_file_position);
def_subr("SET-GAREF", f_set_garef);
def_subr("SET-PROPERTY", f_set_property);
def_subr("SET-SLOT-VALUE", f_set_slot_value);
def_subr("SIGNAL-CONDITION", f_signal_condition);
def_subr("SIMPLE-ERROR-FORMAT-ARGUMENTS",
f_simple_error_format_arguments);
def_subr("SIMPLE-ERROR-FORMAT-STRING", f_simple_error_format_string);
def_subr("SIN", f_sin);
def_subr("SINH", f_sinh);
def_subr("SLOT-VALUE", f_slot_value);
def_subr("SQRT", f_sqrt);
def_subr("STANDARD-INPUT", f_standard_input);
def_subr("STANDARD-OUTPUT", f_standard_output);
def_subr("STREAM-ERROR-STREAM", f_stream_error_stream);
def_subr("STREAMP", f_streamp);
def_subr("STREAM-READY-P", f_stream_ready_p);
def_subr("STRING-APPEND", f_string_append);
def_subr("STRING-INDEX", f_string_index);
def_subr("STRING/=", f_string_noteqp);
def_subr("STRING<", f_string_smallerp);
def_subr("STRING<=", f_string_eqsmallerp);
def_subr("STRING=", f_string_eqp);
def_subr("STRING>", f_string_greaterp);
def_subr("STRING>=", f_string_eqgreaterp);
def_subr("STRINGP", f_stringp);
def_subr("SUBCLASSP", f_subclassp);
def_subr("SUBSEQ", f_subseq);
def_subr("SYMBOLP", f_symbolp);
def_subr("TAN", f_tan);
def_subr("TANH", f_tanh);
def_subr("TRUNCATE", f_truncate);
def_subr("UNDEFINED-ENTITY-NAME", f_undefined_entity_name);
def_subr("UNDEFINED-ENTITY-NAMESPACE", f_undefined_entity_namespace);
def_subr("VECTOR", f_vector);
def_subr("WRITE-BYTE", f_write_byte);
/* inner extended functions */
def_subr("EISL-DUMMYP", f_dummyp);
}
/*
* initialize generic functions
*/
void init_generic(void)
{
int lamlis, body;
lamlis = list3(make_sym("x"), make_sym(":REST"), make_sym("y"));
body =
list3(make_sym(":METHOD"),
list3(make_sym("x"), make_sym(":REST"), make_sym("y")),
list4(make_sym("LET"),
list1(list2
(make_sym("obj"),
list3(make_sym("CREATE*"), make_sym("x"),
NIL))),
list3(make_sym("INITIALIZE-OBJECT"), make_sym("obj"),
make_sym("y")), make_sym("obj")));
eval(list4(make_sym("DEFGENERIC"), make_sym("CREATE"), lamlis, body),
0);
/*
* (defgeneric create(x :rest y) (:method (x :rest y) (let ((obj (create* x
* '()))) (initialize-object obj y) obj)))
*
*/
lamlis = list2(make_sym("x"), make_sym("y"));
body = list3(make_sym(":METHOD"), list2(make_sym("x"), make_sym("y")),
list3(make_sym("INITIALIZE-OBJECT*"), make_sym("x"),
make_sym("y")));
eval(list4
(make_sym("DEFGENERIC*"), make_sym("INITIALIZE-OBJECT"), lamlis,
body), 0);
/*
* (defgeneric* initialize-object(x y) (:method (x y)
* (initialize-object* x y)))
*/
lamlis = list2(make_sym("x"), make_sym("y"));
body = NIL;
eval(list4
(make_sym("DEFGENERIC*"), make_sym("REPORT-CONDITION"), lamlis,
body), 0);
/*
* (defgeneric report-condition (x y))
*/
}
/* arithmetic function */
int f_plus(int arglist, int th __unused)
{
int augend;
augend = make_int(0);
for (int remaining_operands = arglist;
!(IS_NIL(remaining_operands));
remaining_operands = cdr(remaining_operands)) {
int addend = car(remaining_operands);
augend = plus(augend, addend);
}
return (augend);
}
int f_minus(int arglist, int th)
{
int minuend, n;
minuend = car(arglist);
if ((n = length(arglist)) == 0)
error(WRONG_ARGS, "-", arglist, th);
if (n == 1)
return (mult(minuend, make_int(-1)));
arglist = cdr(arglist);
for (int remaining_operands = arglist;
!(IS_NIL(remaining_operands));
remaining_operands = cdr(remaining_operands)) {
int subtrahend = car(remaining_operands);
minuend = minus(minuend, subtrahend);
}
return (minuend);
}
int f_mult(int arglist, int th __unused)
{
int multiplicand;
multiplicand = make_int(1);
for (int remaining_operands = arglist;
!(IS_NIL(remaining_operands));
remaining_operands = cdr(remaining_operands)) {
int multiplier = car(remaining_operands);
multiplicand = mult(multiplicand, multiplier);
}
return (multiplicand);
}
int f_quotient(int arglist, int th __unused)
{
int dividend;
dividend = car(arglist);
arglist = cdr(arglist);
for (int remaining_operands = arglist;
!(IS_NIL(remaining_operands));
remaining_operands = cdr(remaining_operands)) {
int divisor = car(remaining_operands);
dividend = quotient(dividend, divisor);
}
return (dividend);
}
int f_smaller(int arglist, int th)
{
int arg1, arg2;
arg1 = car(arglist);
arg2 = cadr(arglist);
if (length(arglist) != 2)
error(WRONG_ARGS, "<", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "<", arg1, th);
if (!numberp(arg2))
error(NOT_NUM, "<", arg2, th);
if (smallerp(arg1, arg2))
return (T);
else
return (NIL);
}
int f_eqsmaller(int arglist, int th)
{
int arg1, arg2;
arg1 = car(arglist);
arg2 = cadr(arglist);
if (length(arglist) != 2)
error(WRONG_ARGS, "<=", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "<=", arg1, th);
if (!numberp(arg2))
error(NOT_NUM, "<=", arg2, th);
if (eqsmallerp(arg1, arg2))
return (T);
else
return (NIL);
}
int f_greater(int arglist, int th)
{
int arg1, arg2;
arg1 = car(arglist);
arg2 = cadr(arglist);
if (length(arglist) != 2)
error(WRONG_ARGS, ">", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, ">", arg1, th);
if (!numberp(arg2))
error(NOT_NUM, ">", arg2, th);
if (greaterp(arg1, arg2))
return (T);
else
return (NIL);
}
int f_eqgreater(int arglist, int th)
{
int arg1, arg2;
arg1 = car(arglist);
arg2 = cadr(arglist);
if (length(arglist) != 2)
error(WRONG_ARGS, ">=", arglist, th);
if (length(arglist) != 2)
error(WRONG_ARGS, ">=", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, ">=", arg1, th);
if (!numberp(arg2))
error(NOT_NUM, ">=", arg2, th);
if (eqgreaterp(arg1, arg2))
return (T);
else
return (NIL);
}
int f_sin(int arglist, int th)
{
int arg1;
double val;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "sin", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "sin", arg1, th);
val = sin(GET_FLT(exact_to_inexact(arg1)));
return (make_flt(val));
}
int f_cos(int arglist, int th)
{
int arg1;
double val;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "cos", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "cos", arg1, th);
val = cos(GET_FLT(exact_to_inexact(arg1)));
return (make_flt(val));
}
int f_tan(int arglist, int th)
{
int arg1;
double val;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "tan", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "tan", arg1, th);
val = tan(GET_FLT(exact_to_inexact(arg1)));
return (make_flt(val));
}
int f_atan(int arglist, int th)
{
int arg1;
double val;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "atan", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "atan", arg1, th);
val = atan(GET_FLT(exact_to_inexact(arg1)));
return (make_flt(val));
}
int f_sinh(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "sinh", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "sinh", arg1, th);
double x, y;
x = GET_FLT(exact_to_inexact(arg1));
y = sinh(x);
if (fabs(y) >= DBL_MAX)
error(FLT_OVERF, "sinh", arg1, th);
return (make_flt(y));
}
int f_cosh(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "cosh", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "cosh", arg1, th);
double x, y;
x = GET_FLT(exact_to_inexact(arg1));
y = cosh(x);
if (fabs(y) >= DBL_MAX)
error(FLT_OVERF, "sinh", arg1, th);
return (make_flt(y));
}
int f_tanh(int arglist, int th)
{
int arg1;
double val;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "tanh", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "tanh", arg1, th);
val = GET_FLT(exact_to_inexact(arg1));
val = tanh(val);
return (make_flt(val));
}
int f_atanh(int arglist, int th)
{
int arg1;
double val;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "atanh", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "atanh", arg1, th);
val = GET_FLT(exact_to_inexact(arg1));
if (val >= 1.0 || val <= -1.0)
error(FLT_OUT_OF_DOMAIN, "atanh", arg1, th);
val = atanh(val);
return (make_flt(val));
}
int f_floor(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "floor", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "floor", arg1, th);
if (floatp(arg1)) {
double x;
x = floor(GET_FLT(arg1));
if (x <= 999999999 && x >= -999999999)
return (make_int((int) x));
else if ((long long int) x <= 999999999999999999
&& (long long int) x >= -999999999999999999)
return (make_long((long long int) x));
else
return (make_flt(x));
} else
return (arg1);
}
int f_ceiling(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "ceiling", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "ceiling", arg1, th);
if (floatp(arg1)) {
double x;
x = GET_FLT(arg1);
if (x <= 999999999.0 && x >= -999999999.0)
return (make_int((int) ceil(x)));
else
return (make_long((long long int) (ceil(x))));
} else
return (arg1);
}
int f_truncate(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "truncate", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "truncate", arg1, th);
if (floatp(arg1)) {
double x;
x = GET_FLT(arg1);
if (x >= 0 && x <= 999999999.0)
return (make_int((int) floor(x)));
else if (x > 999999999.0)
return (make_long((long long int) floor(x)));
else if (x < 0 && x >= -999999999.0)
return (make_int((int) ceil(x)));
else
return (make_long((long long int) ceil(x)));
} else
return (arg1);
}
int f_round(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "round", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "round", arg1, th);
if (floatp(arg1)) {
double x, f, c;
x = GET_FLT(arg1);
f = floor(x);
c = ceil(x);
if (x == (f + c) / 2)
if (fmod(f, 2.0) == 0.0)
x = f;
else
x = c;
else
x = round(x);
if (x <= 999999999.0 && x >= -999999999.0)
return (make_int((int) x));
else if (x <= 999999999999999999.0 && x >= -999999999999999999.0)
return (make_long((long long int) x));
} else
return (arg1);
}
int f_gcd(int arglist, int th)
{
int arg1, arg2;
arg1 = car(arglist);
arg2 = cadr(arglist);
if (length(arglist) != 2)
error(WRONG_ARGS, "gcd", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "gcd", arg1, th);
if (!numberp(arg2))
error(NOT_NUM, "gcd", arg2, th);
return (gcd(arg1, arg2));
}
int f_lcm(int arglist, int th)
{
int arg1, arg2;
arg1 = car(arglist);
arg2 = cadr(arglist);
if (length(arglist) != 2)
error(WRONG_ARGS, "lcm", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "lcm", arg1, th);
if (!numberp(arg2))
error(NOT_NUM, "lcm", arg2, th);
return (lcm(arg1, arg2));
}
int f_max(int arglist, int th)
{
int res;
res = car(arglist);
if (!numberp(res))
error(NOT_NUM, "max", res, th);
arglist = cdr(arglist);
while (!nullp(arglist)) {
int arg1;
arg1 = car(arglist);
if (!numberp(arg1))
error(NOT_NUM, "max", arg1, th);
if (greaterp(arg1, res))
res = arg1;
arglist = cdr(arglist);
}
return (res);
}
int f_min(int arglist, int th)
{
int res;
res = car(arglist);
if (!numberp(res))
error(NOT_NUM, "min", res, th);
arglist = cdr(arglist);
while (!nullp(arglist)) {
int arg1;
arg1 = car(arglist);
if (!numberp(arg1))
error(NOT_NUM, "min", arg1, th);
if (smallerp(arg1, res))
res = arg1;
arglist = cdr(arglist);
}
return (res);
}
int f_float(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "float", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "float", arg1, th);
return (exact_to_inexact(arg1));
}
int f_floatp(int arglist, int th)
{
int arg;
arg = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "floatp", arglist, th);
if (IS_FLOAT(arg))
return (T);
else
return (NIL);
}
int f_div(int arglist, int th)
{
int arg1, arg2, q, r;
arg1 = car(arglist);
arg2 = cadr(arglist);
if (length(arglist) != 2)
error(WRONG_ARGS, "div", arglist, th);
if (!numberp(arg1))
error(NOT_INT, "div", arg1, th);
if (!numberp(arg2))
error(NOT_INT, "div", arg2, th);
if (zerop(arg2))
error(DIV_ZERO, "div", arglist, th);
q = divide(arg1, arg2);
r = minus(arg1, mult(arg2, q));
if (zerop(r))
return (q);
else if (positivep(arg1) && negativep(arg2))
return (minus(q, make_int(1)));
else if (negativep(arg1) && positivep(arg2))
return (minus(q, make_int(1)));
else
return (q);
}
int f_integerp(int arglist, int th)
{
int arg;
arg = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "integerp", arglist, th);
if (math_integerp(arg))
return (T);
else
return (NIL);
}
int f_abs(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "abs", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "abs", arg1, th);
return (absolute(arg1));
}
int f_mod(int arglist, int th)
{
int arg1, arg2, div;
arg1 = car(arglist);
arg2 = cadr(arglist);
if (length(arglist) != 2)
error(WRONG_ARGS, "mod", arglist, th);
if (!integerp(arg1) && !longnump(arg1) && !bignump(arg1))
error(NOT_INT, "mod", arg1, th);
if (!integerp(arg2) && !longnump(arg2) && !bignump(arg2))
error(NOT_INT, "mod", arg2, th);
div = f_div(arglist, 0);
return (minus(arg1, mult(arg2, div)));
}
int f_exp(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "exp", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "exp", arg1, th);
double x, y;
x = GET_FLT(exact_to_inexact(arg1));
y = exp(x);
if (y > DBL_MAX)
error(FLT_OVERF, "exp", arg1, th);
if (x < -DBL_MAX)
error(FLT_UNDERF, "exp", arg1, th);
return (make_flt(y));
}
int f_log(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "log", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "log", arg1, th);
if (!positivep(arg1))
error(OUT_OF_REAL, "log", arglist, th);
return (make_flt(log(GET_FLT(exact_to_inexact(arg1)))));
}
int f_expt(int arglist, int th)
{
int arg1, arg2, i;
double x, y;
arg1 = car(arglist);
arg2 = cadr(arglist);
if (length(arglist) != 2)
error(WRONG_ARGS, "expt", arglist, th);
if (!numberp(arg1))
error(NOT_NUM, "expt", arg1, th);
if (!numberp(arg2))
error(NOT_NUM, "expt", arg2, th);
if (zerop(arg1) && negativep(arg2))
error(IMPROPER_ARGS, "expt", arglist, th);
if (zerop(arg1) && zerop(arg2) && floatp(arg2))
error(IMPROPER_ARGS, "expt", arglist, th);
if (negativep(arg1) && floatp(arg2))
error(IMPROPER_ARGS, "expt", arglist, th);
// If base is greater than 1 and exponent is infinite
// signal overflow condition
if (greaterp(arg1, make_int(1)) && floatp(arg2)
&& GET_FLT(arg2) >= DBL_MAX)
error(FLT_OVERF, "expt", arglist, th);
// If base is greater than one and the exponent is negative infinite
// signal underflow condition
if (greaterp(arg1, make_int(1)) && floatp(arg2)
&& GET_FLT(arg2) <= -DBL_MAX)
error(FLT_UNDERF, "expt", arglist, th);
// If base is infinite and the exponent is greater than one
// signal overflow condition
if (greaterp(arg2, make_int(1)) && floatp(arg1)
&& GET_FLT(arg1) >= DBL_MAX)
error(FLT_OVERF, "expt", arglist, th);
// If base is infinite and exponent is negative
// signal underflow condition
if (negativep(arg2) && floatp(arg1) && GET_FLT(arg1) >= DBL_MAX)
error(FLT_UNDERF, "expt", arglist, th);
// BUG: This behavior should depend on whether the exponent is odd or even.
// Even exponents should give an overflow condition
// Odd exponents should give an underflow condition
//
// If base is negative infinite and exponent is integer greater than one
// signal overflow condition
if (greaterp(arg2, make_int(1)) && floatp(arg1)
&& GET_FLT(arg1) <= -DBL_MAX)
error(FLT_OVERF, "expt", arglist, th);
// If base is negative infinite and exponent is negative
// signal underflow condition
if (negativep(arg2) && floatp(arg1) && GET_FLT(arg1) <= -DBL_MAX)
error(FLT_UNDERF, "expt", arglist, th);
if ((integerp(arg1) || longnump(arg1) || bignump(arg1))
&& integerp(arg2) && GET_INT(arg2) == 0)
return (make_int(1));
if (integerp(arg1) && GET_INT(arg1) == 1
&& (floatp(arg2) || negativep(arg2)))
return (make_flt(1.0));
if (integerp(arg1) && GET_INT(arg1) == -1 && floatp(arg2)) {
x = GET_FLT(arg2);
if (x - ceil(x) == 0.0 && (int) x % 2 == 0)
return (make_flt(1.0));
else
return (make_flt(-1.0));
}
if (integerp(arg1) && GET_INT(arg1) == -1 && integerp(arg2)) {
i = GET_INT(arg2);
if (i >= 0) {
if (i % 2 == 0)
return (make_int(1));
else
return (make_int(-1));
} else {
if (i % 2 == 0)
return (make_flt(1.0));
else
return (make_flt(-1.0));
}
}
if (integerp(arg1) && GET_INT(arg1) == -1
&& (longnump(arg2) || bignump(arg2))) {
int j, k;
i = make_int(2);
j = divide(arg2, i);
k = minus(arg2, mult(j, i));
if (positivep(arg2)) {
if (zerop(k))
return (make_int(1));
else
return (make_int(-1));
} else {
if (zerop(k))
return (make_flt(1.0));
else
return (make_flt(-1.0));
}
}
if ((integerp(arg1) || longnump(arg1) || bignump(arg1))
&& (integerp(arg2) && GET_INT(arg2) > 0))
return (expt(arg1, GET_INT(arg2)));
if ((integerp(arg1) || floatp(arg1)) &&
(integerp(arg2) || floatp(arg2))) {
double z;
arg1 = exact_to_inexact(arg1);
arg2 = exact_to_inexact(arg2);
x = GET_FLT(arg1);
y = GET_FLT(arg2);
z = pow(x, y);
return (make_flt(z));
}
if (integerp(arg1)
&& (integerp(arg2) || longnump(arg2) || bignump(arg2))) {
if (GET_INT(arg1) == 1)
return (arg1);
else if (GET_INT(arg1) == 0)
return (arg1);