1 /* Copyright (C) 1995,1996,2000,2001 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. */
42 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
43 gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
47 #include "libguile/_scm.h"
48 #include "libguile/validate.h"
50 #include "libguile/pairs.h"
57 #if (SCM_DEBUG_PAIR_ACCESSES == 1)
59 #include "libguile/ports.h"
60 #include "libguile/strings.h"
62 void scm_error_pair_access (SCM non_pair
)
64 SCM message
= scm_makfrom0str ("Non-pair accessed with SCM_C[AD]R: `~S´\n");
65 scm_simple_format (scm_current_error_port (), message
, SCM_LIST1 (non_pair
));
71 SCM_DEFINE (scm_cons
, "cons", 2, 0, 0,
73 "Return a newly allocated pair whose car is @var{x} and whose\n"
74 "cdr is @var{y}. The pair is guaranteed to be different (in the\n"
75 "sense of @code{eq?}) from every previously existing object.")
76 #define FUNC_NAME s_scm_cons
80 SCM_SET_CELL_OBJECT_0 (z
, x
);
81 SCM_SET_CELL_OBJECT_1 (z
, y
);
88 scm_cons2 (SCM w
, SCM x
, SCM y
)
94 SCM_SET_CELL_OBJECT_0 (z1
, x
);
95 SCM_SET_CELL_OBJECT_1 (z1
, y
);
98 SCM_SET_CELL_OBJECT_0 (z2
, w
);
99 SCM_SET_CELL_OBJECT_1 (z2
, z1
);
105 SCM_DEFINE (scm_pair_p
, "pair?", 1, 0, 0,
107 "Return @code{#t} if @var{x} is a pair; otherwise return\n"
109 #define FUNC_NAME s_scm_pair_p
111 return SCM_BOOL (SCM_CONSP (x
));
116 SCM_DEFINE (scm_set_car_x
, "set-car!", 2, 0, 0,
117 (SCM pair
, SCM value
),
118 "Stores @var{value} in the car field of @var{pair}. The value returned\n"
119 "by @code{set-car!} is unspecified.")
120 #define FUNC_NAME s_scm_set_car_x
122 SCM_VALIDATE_CONS (1, pair
);
123 SCM_SETCAR (pair
, value
);
124 return SCM_UNSPECIFIED
;
129 SCM_DEFINE (scm_set_cdr_x
, "set-cdr!", 2, 0, 0,
130 (SCM pair
, SCM value
),
131 "Stores @var{value} in the cdr field of @var{pair}. The value returned\n"
132 "by @code{set-cdr!} is unspecified.")
133 #define FUNC_NAME s_scm_set_cdr_x
135 SCM_VALIDATE_CONS (1, pair
);
136 SCM_SETCDR (pair
, value
);
137 return SCM_UNSPECIFIED
;
143 static const char * cxrs
[] =
183 unsigned int subnr
= 0;
185 for (subnr
= 0; cxrs
[subnr
]; subnr
++)
186 scm_c_define_subr (cxrs
[subnr
], scm_tc7_cxr
, NULL
);
188 #ifndef SCM_MAGIC_SNARFER
189 #include "libguile/pairs.x"