libguile/gh_list.c

   1 /*      Copyright (C) 1995,1996,1997, 2000 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 "libguile/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 /* gh_list(SCM elt, ...) is implemented as a macro in gh.h. */
  59
  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)
  64 {
  65   return scm_append(args);
  66 }
  67
  68 SCM gh_append2(SCM l1, SCM l2)
  69 {
  70   return scm_append(scm_listify(l1, l2, SCM_UNDEFINED));
  71 }
  72
  73 SCM gh_append3(SCM l1, SCM l2, SCM l3)
  74 {
  75   return scm_append(scm_listify(l1, l2, l3, SCM_UNDEFINED));
  76 }
  77
  78 SCM gh_append4(SCM l1, SCM l2, SCM l3, SCM l4)
  79 {
  80   return scm_append(scm_listify(l1, l2, l3, l4, SCM_UNDEFINED));
  81 }
  82
  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 */
  92
  93 /* analogous to the Scheme cons operator */
  94 SCM
  95 gh_cons (SCM x, SCM y)
  96 {
  97   return scm_cons (x, y);
  98 }
  99
 100 /* analogous to the Scheme car operator */
 101 SCM
 102 gh_car (SCM x)
 103 {
 104   return SCM_CAR (x);
 105 }
 106
 107 /* analogous to the Scheme cdr operator */
 108 SCM
 109 gh_cdr (SCM x)
 110 {
 111   return SCM_CDR (x);
 112 }
 113
 114 /* now for the multiple car/cdr utility procedures */
 115 SCM
 116 gh_caar (SCM x)
 117 {
 118   return SCM_CAAR (x);
 119 }
 120 SCM
 121 gh_cadr (SCM x)
 122 {
 123   return SCM_CADR (x);
 124 }
 125 SCM
 126 gh_cdar (SCM x)
 127 {
 128   return SCM_CDAR (x);
 129 }
 130 SCM
 131 gh_cddr (SCM x)
 132 {
 133   return SCM_CDDR (x);
 134 }
 135
 136 SCM
 137 gh_caaar (SCM x)
 138 {
 139   return SCM_CAAAR (x);
 140 }
 141 SCM
 142 gh_caadr (SCM x)
 143 {
 144   return SCM_CAADR (x);
 145 }
 146 SCM
 147 gh_cadar (SCM x)
 148 {
 149   return SCM_CADAR (x);
 150 }
 151 SCM
 152 gh_caddr (SCM x)
 153 {
 154   return SCM_CADDR (x);
 155 }
 156 SCM
 157 gh_cdaar (SCM x)
 158 {
 159   return SCM_CDAAR (x);
 160 }
 161 SCM
 162 gh_cdadr (SCM x)
 163 {
 164   return SCM_CDADR (x);
 165 }
 166 SCM
 167 gh_cddar (SCM x)
 168 {
 169   return SCM_CDDAR (x);
 170 }
 171 SCM
 172 gh_cdddr (SCM x)
 173 {
 174   return SCM_CDDDR (x);
 175 }
 176
 177 /* equivalent to (set-car! pair value) */
 178 SCM
 179 gh_set_car_x(SCM pair, SCM value)
 180 {
 181   return scm_set_car_x(pair, value);
 182 }
 183
 184 /* equivalent to (set-cdr! pair value) */
 185 SCM
 186 gh_set_cdr_x(SCM pair, SCM value)
 187 {
 188   return scm_set_cdr_x(pair, value);
 189 }
 190
 191 /*
 192   Local Variables:
 193   c-file-style: "gnu"
 194   End:
 195 */