libguile/gh_test_repl.c

   1 /*      Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
   2
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
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  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  16  * Boston, MA 02111-1307 USA
  17  *
  18  * As a special exception, the Free Software Foundation gives permission
  19  * for additional uses of the text contained in its release of GUILE.
  20  *
  21  * The exception is that, if you link the GUILE library with other files
  22  * to produce an executable, this does not by itself cause the
  23  * resulting executable to be covered by the GNU General Public License.
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  38  * If you write modifications of your own for GUILE, it is your choice
  39  * whether to permit this exception to apply to your modifications.
  40  * If you do not wish that, delete this exception notice.  */
  41 \f
  42
  43 /* gh_test_repl -- a program that demonstrates starting Guile, adding
  44    some privmitive procedures and entering a REPL form C */
  45
  46 #include <stdio.h>
  47 #include <math.h>
  48
  49 #include "libguile/gh.h"
  50
  51 SCM c_factorial (SCM s_n);
  52 SCM c_sin (SCM s_x);
  53 SCM c_vector_test (SCM s_length);
  54
  55 /* the gh_enter() routine, the standard entryp point for the gh_
  56    interface, makes you use a separate main function */
  57 void
  58 main_prog (int argc, char *argv[])
  59 {
  60   SCM cf;
  61
  62   gh_eval_str ("(display \"hello guile\n\")");
  63
  64   gh_eval_str ("(define (square x) (* x x))");
  65   gh_eval_str ("(define (fact n) (if (= n 1) 1 (* n (fact (- n 1)))))");
  66
  67   gh_eval_str ("(display (square 9)) (newline)");
  68   gh_eval_str ("(display (fact 100)) (newline)");
  69
  70   gh_eval_str ("(define s \"A string\")");
  71   gh_eval_str ("(define p '(A . pair))");
  72   gh_eval_str ("(display s)");
  73   gh_eval_str ("(display p)");
  74   gh_eval_str ("(display (string? s))");
  75   gh_eval_str ("(display (pair? s))");
  76
  77   /* now define some new primitives in C */
  78   cf = gh_new_procedure1_0 ("c-factorial", c_factorial);
  79   gh_new_procedure1_0 ("c-sin", c_sin);
  80   gh_new_procedure1_0 ("c-vector-test", c_vector_test);
  81
  82   /* now try some (eval ...) action from C */
  83   {
  84     SCM l = SCM_EOL;
  85     l = gh_cons (gh_str02scm ("hello world"), l);
  86     l = gh_cons (gh_symbol2scm ("'display"), l);
  87     gh_display (l);
  88   }
  89
  90   {
  91     SCM a_string;
  92     a_string = gh_str02scm ("A string");
  93
  94     printf ("testing the predicates for pair? and string?\n");
  95     printf ("gh_pair_p(a_string) is %d, gh_string_p(a_string) is %d\n",
  96             gh_pair_p (a_string), gh_string_p (a_string));
  97   }
  98
  99   printf ("testing the predicates for procedure? and vector?\n");
 100   printf ("gh_procedure_p(c_factorial) is %d, gh_vector_p(c_factorial) is %d\n",
 101           gh_procedure_p (cf), gh_vector_p (cf));
 102   gh_eval_str("(c-vector-test 200)");
 103
 104   gh_repl (argc, argv);
 105 }
 106
 107 int
 108 main (int argc, char *argv[])
 109 {
 110   gh_enter (argc, argv, main_prog);
 111   return 0;
 112 }
 113
 114 SCM
 115 c_factorial (SCM s_n)
 116 {
 117   int i, n;
 118   unsigned long result = 1;
 119
 120   n = gh_scm2ulong (s_n);
 121
 122   for (i = 1; i <= n; ++i)
 123     {
 124       result = result * i;
 125     }
 126   return gh_ulong2scm (result);
 127 }
 128
 129 /* a sin routine in C, callable from scheme.  it is named c_sin() to
 130    distinguish it from the default scheme sin function */
 131 SCM
 132 c_sin (SCM s_x)
 133 {
 134   double x = gh_scm2double (s_x);
 135
 136   return gh_double2scm (sin (x));
 137 }
 138
 139 /* play around with vectors in guile: this routine creates a vector of
 140    the given length, initializes it all to zero except element 2 which
 141    is set to 1.9. */
 142 SCM
 143 c_vector_test (SCM s_length)
 144 {
 145   SCM xvec;
 146   unsigned long c_length;
 147
 148   c_length = gh_scm2ulong (s_length);
 149   printf ("VECTOR test -- requested length for vector: %ld", c_length);
 150
 151   /* create a vector filled witth 0.0 entries */
 152   xvec = gh_make_vector (s_length, gh_double2scm (0.0));
 153   /* set the second element in it to some floating point value */
 154   gh_vector_set_x (xvec, gh_int2scm(2), gh_double2scm (1.9));
 155
 156   /* I think I can use == because Scheme's doubles should be the same
 157      as C doubles, with no operations in between */
 158   if (gh_scm2double(gh_vector_ref (xvec, gh_int2scm(2))) == 1.9) {
 159     printf("... PASS\n");
 160   } else {
 161     printf("... FAIL\n");
 162   }
 163
 164   return xvec;
 165 }
 166
 167 /*
 168   Local Variables:
 169   c-file-style: "gnu"
 170   End:
 171 */