libguile/gh_list.c

   1 /*      Copyright (C) 1995,1996,1997 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
  43 /* list manipulation */
  44
  45 #include <stdio.h>
  46
  47 #include <gh.h>
  48
  49 /* returns the length of a list */
  50 unsigned long
  51 gh_length (SCM l)
  52 {
  53   return gh_scm2ulong (scm_length (l));
  54 }
  55
  56 /* list operations */
  57
  58 /* analogous to the Scheme cons operator */
  59 SCM
  60 gh_cons (SCM x, SCM y)
  61 {
  62   return scm_cons (x, y);
  63 }
  64
  65 /* gh_list(SCM elt, ...) is implemented as a macro in gh.h. */
  66
  67 /* analogous to the Scheme car operator */
  68 SCM
  69 gh_car (SCM x)
  70 {
  71   return SCM_CAR (x);
  72 }
  73
  74 /* analogous to the Scheme cdr operator */
  75 SCM
  76 gh_cdr (SCM x)
  77 {
  78   return SCM_CDR (x);
  79 }
  80
  81 /* now for the multiple car/cdr utility procedures */
  82 SCM
  83 gh_caar (SCM x)
  84 {
  85   return SCM_CAAR (x);
  86 }
  87 SCM
  88 gh_cadr (SCM x)
  89 {
  90   return SCM_CADR (x);
  91 }
  92 SCM
  93 gh_cdar (SCM x)
  94 {
  95   return SCM_CDAR (x);
  96 }
  97 SCM
  98 gh_cddr (SCM x)
  99 {
 100   return SCM_CDDR (x);
 101 }
 102
 103 SCM
 104 gh_caaar (SCM x)
 105 {
 106   return SCM_CAAAR (x);
 107 }
 108 SCM
 109 gh_caadr (SCM x)
 110 {
 111   return SCM_CAADR (x);
 112 }
 113 SCM
 114 gh_cadar (SCM x)
 115 {
 116   return SCM_CADAR (x);
 117 }
 118 SCM
 119 gh_caddr (SCM x)
 120 {
 121   return SCM_CADDR (x);
 122 }
 123 SCM
 124 gh_cdaar (SCM x)
 125 {
 126   return SCM_CDAAR (x);
 127 }
 128 SCM
 129 gh_cdadr (SCM x)
 130 {
 131   return SCM_CDADR (x);
 132 }
 133 SCM
 134 gh_cddar (SCM x)
 135 {
 136   return SCM_CDDAR (x);
 137 }
 138 SCM
 139 gh_cdddr (SCM x)
 140 {
 141   return SCM_CDDDR (x);
 142 }