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 */
53 return gh_scm2ulong (scm_length (l
));
58 /* gh_list(SCM elt, ...) is implemented as a macro in gh.h. */
60 /* gh_append() takes a args, which is a list of lists, and appends
61 them all together into a single list, which is returned. This is
62 equivalent to the Scheme procedure (append list1 list2 ...) */
63 SCM
gh_append(SCM args
)
65 return scm_append(args
);
68 SCM
gh_append2(SCM l1
, SCM l2
)
70 return scm_append(scm_listify(l1
, l2
, SCM_UNDEFINED
));
73 SCM
gh_append3(SCM l1
, SCM l2
, SCM l3
)
75 return scm_append(scm_listify(l1
, l2
, l3
, SCM_UNDEFINED
));
78 SCM
gh_append4(SCM l1
, SCM l2
, SCM l3
, SCM l4
)
80 return scm_append(scm_listify(l1
, l2
, l3
, l4
, SCM_UNDEFINED
));
83 /* gh_reverse() is defined as a macro in gh.h */
84 /* gh_list_tail() is defined as a macro in gh.h */
85 /* gh_list_ref() is defined as a macro in gh.h */
86 /* gh_memq() is defined as a macro in gh.h */
87 /* gh_memv() is defined as a macro in gh.h */
88 /* gh_member() is defined as a macro in gh.h */
89 /* gh_assq() is defined as a macro in gh.h */
90 /* gh_assv() is defined as a macro in gh.h */
91 /* gh_assoc() is defined as a macro in gh.h */
93 /* analogous to the Scheme cons operator */
95 gh_cons (SCM x
, SCM y
)
97 return scm_cons (x
, y
);
100 /* analogous to the Scheme car operator */
107 /* analogous to the Scheme cdr operator */
114 /* now for the multiple car/cdr utility procedures */
139 return SCM_CAAAR (x
);
144 return SCM_CAADR (x
);
149 return SCM_CADAR (x
);
154 return SCM_CADDR (x
);
159 return SCM_CDAAR (x
);
164 return SCM_CDADR (x
);
169 return SCM_CDDAR (x
);
174 return SCM_CDDDR (x
);
177 /* equivalent to (set-car! pair value) */
179 gh_set_car_x(SCM pair
, SCM value
)
181 return scm_set_car_x(pair
, value
);
184 /* equivalent to (set-cdr! pair value) */
186 gh_set_cdr_x(SCM pair
, SCM value
)
188 return scm_set_cdr_x(pair
, value
);