libguile/pairs.c

   1 /*      Copyright (C) 1995,1996 Free Software Foundation, Inc.
   2  *
   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)
   6  * any later version.
   7  *
   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.
  12  *
  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
  17  *
  18  * As a special exception, the Free Software Foundation gives permission
  19  * for additional uses of the text contained in its release of GUILE.
  20  *
  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.
  26  *
  27  * This exception does not however invalidate any other reasons why
  28  * the executable file might be covered by the GNU General Public License.
  29  *
  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.
  37  *
  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.  */
  41 \f
  42 #include <stdio.h>
  43 #include "_scm.h"
  44
  45 \f
  46
  47 /* {Pairs}
  48  */
  49
  50 SCM_PROC(s_cons, "cons", 2, 0, 0, scm_cons);
  51
  52 SCM
  53 scm_cons (x, y)
  54      SCM x;
  55      SCM y;
  56 {
  57   register SCM z;
  58   SCM_NEWCELL (z);
  59   SCM_SETCAR (z, x);
  60   SCM_SETCDR (z, y);
  61   return z;
  62 }
  63
  64
  65 SCM
  66 scm_cons2 (w, x, y)
  67      SCM w;
  68      SCM x;
  69      SCM y;
  70 {
  71   register SCM z;
  72   SCM_NEWCELL (z);
  73   SCM_SETCAR (z, x);
  74   SCM_SETCDR (z, y);
  75   x = z;
  76   SCM_NEWCELL (z);
  77   SCM_SETCAR (z, w);
  78   SCM_SETCDR (z, x);
  79   return z;
  80 }
  81
  82
  83 SCM_PROC (s_pair_p, "pair?", 1, 0, 0, scm_pair_p);
  84
  85 SCM
  86 scm_pair_p (x)
  87      SCM x;
  88 {
  89   if (SCM_IMP (x))
  90     return SCM_BOOL_F;
  91   return SCM_CONSP (x) ? SCM_BOOL_T : SCM_BOOL_F;
  92 }
  93
  94 SCM_PROC (s_set_car_x, "set-car!", 2, 0, 0, scm_set_car_x);
  95
  96 SCM
  97 scm_set_car_x (pair, value)
  98      SCM pair;
  99      SCM value;
 100 {
 101   SCM_ASSERT (SCM_NIMP (pair) && SCM_CONSP (pair),
 102               pair, SCM_ARG1, s_set_car_x);
 103   SCM_SETCAR (pair, value);
 104   return value;
 105 }
 106
 107 SCM_PROC (s_set_cdr_x, "set-cdr!", 2, 0, 0, scm_set_cdr_x);
 108
 109 SCM
 110 scm_set_cdr_x (pair, value)
 111      SCM pair;
 112      SCM value;
 113 {
 114   SCM_ASSERT (SCM_NIMP(pair) && SCM_CONSP (pair), pair, SCM_ARG1, s_set_cdr_x);
 115   SCM_SETCDR (pair, value);
 116   return value;
 117 }
 118
 119
 120 \f
 121
 122 static const scm_iproc cxrs[] =
 123 {
 124   {"car", 0},
 125   {"cdr", 0},
 126   {"caar", 0},
 127   {"cadr", 0},
 128   {"cdar", 0},
 129   {"cddr", 0},
 130   {"caaar", 0},
 131   {"caadr", 0},
 132   {"cadar", 0},
 133   {"caddr", 0},
 134   {"cdaar", 0},
 135   {"cdadr", 0},
 136   {"cddar", 0},
 137   {"cdddr", 0},
 138   {"caaaar", 0},
 139   {"caaadr", 0},
 140   {"caadar", 0},
 141   {"caaddr", 0},
 142   {"cadaar", 0},
 143   {"cadadr", 0},
 144   {"caddar", 0},
 145   {"cadddr", 0},
 146   {"cdaaar", 0},
 147   {"cdaadr", 0},
 148   {"cdadar", 0},
 149   {"cdaddr", 0},
 150   {"cddaar", 0},
 151   {"cddadr", 0},
 152   {"cdddar", 0},
 153   {"cddddr", 0},
 154   {0, 0}
 155 };
 156
 157 \f
 158
 159 void
 160 scm_init_pairs ()
 161 {
 162   scm_init_iprocs (cxrs, scm_tc7_cxr);
 163 #include "pairs.x"
 164 }
 165