File: hello.c

package info (click to toggle)
swi-prolog 6.6.6-1~bpo70+1
  • links: PTS, VCS
  • area: main
  • in suites: wheezy-backports
  • size: 82,312 kB
  • sloc: ansic: 322,250; perl: 245,822; sh: 6,651; java: 5,254; makefile: 4,423; cpp: 4,153; ruby: 1,594; yacc: 843; xml: 82; sed: 12; sql: 6
file content (53 lines) | stat: -rw-r--r-- 1,569 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
/*  $Id$

    Part of SWI-Prolog

    Author:        Jan Wielemaker and Anjo Anjewierden
    E-mail:        jan@swi.psy.uva.nl
    WWW:           http://www.swi-prolog.org
    Copyright (C): 1985-2002, University of Amsterdam

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Very small test and demo to check the foreign interface. After
installing SWI-Prolog, run

	% swipl-ld -o hello -shared hello.c
	% swipl
	?- load_foreign_library(hello).
	?- hello(world).
	Hello World
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

#include <stdio.h>
#include <SWI-Prolog.h>

foreign_t
hello(term_t to)
{ char *s;

  if ( PL_get_atom_chars(to, &s) )
    printf("Hello %s\n", s);

  return TRUE;
}


install_t
install()
{ PL_register_foreign("hello", 1, hello, 0);
}