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/* Copyright (C) 1995,1996,2000,2001 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
#include "libguile/_scm.h"
#include "libguile/validate.h"
#include "libguile/pairs.h"
/* {Pairs}
*/
#if (SCM_DEBUG_PAIR_ACCESSES == 1)
#include "libguile/ports.h"
#include "libguile/strings.h"
void scm_error_pair_access (SCM non_pair)
{
static unsigned int running = 0;
SCM message = scm_makfrom0str ("Non-pair accessed with SCM_C[AD]R: `~S\n");
if (!running)
{
running = 1;
scm_simple_format (scm_current_error_port (),
message, scm_list_1 (non_pair));
abort ();
}
}
#endif
SCM_DEFINE (scm_cons, "cons", 2, 0, 0,
(SCM x, SCM y),
"Return a newly allocated pair whose car is @var{x} and whose\n"
"cdr is @var{y}. The pair is guaranteed to be different (in the\n"
"sense of @code{eq?}) from every previously existing object.")
#define FUNC_NAME s_scm_cons
{
SCM z;
SCM_NEWCELL (z);
SCM_SET_CELL_OBJECT_0 (z, x);
SCM_SET_CELL_OBJECT_1 (z, y);
return z;
}
#undef FUNC_NAME
SCM
scm_cons2 (SCM w, SCM x, SCM y)
{
SCM z1;
SCM z2;
SCM_NEWCELL (z1);
SCM_SET_CELL_OBJECT_0 (z1, x);
SCM_SET_CELL_OBJECT_1 (z1, y);
SCM_NEWCELL (z2);
SCM_SET_CELL_OBJECT_0 (z2, w);
SCM_SET_CELL_OBJECT_1 (z2, z1);
return z2;
}
SCM_DEFINE (scm_pair_p, "pair?", 1, 0, 0,
(SCM x),
"Return @code{#t} if @var{x} is a pair; otherwise return\n"
"@code{#f}.")
#define FUNC_NAME s_scm_pair_p
{
return SCM_BOOL (SCM_CONSP (x));
}
#undef FUNC_NAME
SCM_DEFINE (scm_set_car_x, "set-car!", 2, 0, 0,
(SCM pair, SCM value),
"Stores @var{value} in the car field of @var{pair}. The value returned\n"
"by @code{set-car!} is unspecified.")
#define FUNC_NAME s_scm_set_car_x
{
SCM_VALIDATE_CONS (1, pair);
SCM_SETCAR (pair, value);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_DEFINE (scm_set_cdr_x, "set-cdr!", 2, 0, 0,
(SCM pair, SCM value),
"Stores @var{value} in the cdr field of @var{pair}. The value returned\n"
"by @code{set-cdr!} is unspecified.")
#define FUNC_NAME s_scm_set_cdr_x
{
SCM_VALIDATE_CONS (1, pair);
SCM_SETCDR (pair, value);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
static const char * cxrs[] =
{
"car",
"cdr",
"caar",
"cadr",
"cdar",
"cddr",
"caaar",
"caadr",
"cadar",
"caddr",
"cdaar",
"cdadr",
"cddar",
"cdddr",
"caaaar",
"caaadr",
"caadar",
"caaddr",
"cadaar",
"cadadr",
"caddar",
"cadddr",
"cdaaar",
"cdaadr",
"cdadar",
"cdaddr",
"cddaar",
"cddadr",
"cdddar",
"cddddr",
0
};
void
scm_init_pairs ()
{
unsigned int subnr = 0;
for (subnr = 0; cxrs [subnr]; subnr++)
scm_c_define_subr (cxrs [subnr], scm_tc7_cxr, NULL);
#include "libguile/pairs.x"
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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