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/* Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* 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 the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
/* gh_test_repl -- a program that demonstrates starting Guile, adding
some privmitive procedures and entering a REPL form C */
#include <stdio.h>
#include <math.h>
#include <gh.h>
SCM c_factorial (SCM s_n);
SCM c_sin (SCM s_x);
SCM c_vector_test (SCM s_length);
/* the gh_enter() routine, the standard entryp point for the gh_
interface, makes you use a separate main function */
void
main_prog (int argc, char *argv[])
{
SCM cf;
gh_eval_str ("(display \"hello guile\n\")");
gh_eval_str ("(define (square x) (* x x))");
gh_eval_str ("(define (fact n) (if (= n 1) 1 (* n (fact (- n 1)))))");
gh_eval_str ("(display (square 9)) (newline)");
gh_eval_str ("(display (fact 100)) (newline)");
gh_eval_str ("(define s \"A string\")");
gh_eval_str ("(define p '(A . pair))");
gh_eval_str ("(display s)");
gh_eval_str ("(display p)");
gh_eval_str ("(display (string? s))");
gh_eval_str ("(display (pair? s))");
/* now define some new primitives in C */
cf = gh_new_procedure1_0 ("c_factorial", c_factorial);
gh_new_procedure1_0 ("c_sin", c_sin);
gh_new_procedure1_0 ("c_vector_test", c_vector_test);
/* now try some (eval ...) action from C */
{
SCM l = SCM_EOL;
l = gh_cons (gh_str02scm ("hello world"), l);
l = gh_cons (gh_symbol2scm ("'display"), l);
gh_display (l);
}
{
SCM a_string;
a_string = gh_str02scm ("A string");
printf ("testing the predicates for pair? and string?\n");
printf ("gh_pair_p(a_string) is %d, gh_string_p(a_string) is %d\n",
gh_pair_p (a_string), gh_string_p (a_string));
}
printf ("testing the predicates for procedure? and vector?\n");
printf ("gh_procedure_p(c_factorial) is %d, gh_vector_p(c_factorial) is %d\n",
gh_procedure_p (cf), gh_vector_p (cf));
gh_repl ();
}
int
main (int argc, char *argv[])
{
gh_enter (argc, argv, main_prog);
return 0;
}
SCM
c_factorial (SCM s_n)
{
int i, n;
unsigned long result = 1;
n = gh_scm2ulong (s_n);
for (i = 1; i <= n; ++i)
{
result = result * i;
}
return gh_ulong2scm (result);
}
/* a sin routine in C, callable from scheme. it is named c_sin() to
distinguish it from the default scheme sin function */
SCM
c_sin (SCM s_x)
{
double x = gh_scm2double (s_x);
return gh_double2scm (sin (x));
}
/* play around with vectors in guile: this routine creates a vector of
the given length, initializes it all to zero except element 2 which
is set to 1.9. */
SCM
c_vector_test (SCM s_length)
{
SCM xvec;
unsigned long c_length;
c_length = gh_scm2ulong (s_length);
printf ("requested length for vector: %ld\n", c_length);
/* create a vector filled witth 0.0 entries */
xvec = gh_vector (c_length, gh_double2scm (0.0));
/* set the second element in it to some floating point value */
gh_vset (xvec, 2, gh_double2scm (1.9));
return xvec;
}
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