1 /* Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
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)
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.
13 * You should have received a copy of the GNU General Public License
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
18 * As a special exception, the Free Software Foundation gives permission
19 * for additional uses of the text contained in its release of GUILE.
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.
24 * Your use of that executable is in no way restricted on account of
25 * linking the GUILE library code into it.
27 * This exception does not however invalidate any other reasons why
28 * the executable file might be covered by the GNU General Public License.
30 * This exception applies only to the code released by the
31 * Free Software Foundation under the name GUILE. If you copy
32 * code from other Free Software Foundation releases into a copy of
33 * GUILE, as the General Public License permits, the exception does
34 * not apply to the code that you add in this way. To avoid misleading
35 * anyone as to the status of such modified files, you must delete
36 * this exception notice from them.
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. */
43 /* list manipulation */
49 /* returns the length of a list */
51 gh_list_length (SCM l
)
53 return gh_scm2ulong (scm_list_length (l
));
58 /* analogous to the Scheme cons operator */
60 gh_cons (SCM x
, SCM y
)
62 return scm_cons (x
, y
);
65 /* gh_list(SCM elt, ...) is implemented as a macro in gh.h. */
67 /* analogous to the Scheme car operator */
74 /* analogous to the Scheme cdr operator */
81 /* now for the multiple car/cdr utility procedures */
106 return SCM_CAAAR (x
);
111 return SCM_CAADR (x
);
116 return SCM_CADAR (x
);
121 return SCM_CADDR (x
);
126 return SCM_CDAAR (x
);
131 return SCM_CDADR (x
);
136 return SCM_CDDAR (x
);
141 return SCM_CDDDR (x
);