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 "libguile/gh.h"
  46
  47 /* returns the length of a list */
  48 unsigned long
  49 gh_length (SCM l)
  50 {
  51   return gh_scm2ulong (scm_length (l));
  52 }
  53
  54 /* list operations */
  55
  56 /* gh_list(SCM elt, ...) is implemented as a macro in gh.h. */
  57
  58 /* gh_append() takes a args, which is a list of lists, and appends
  59    them all together into a single list, which is returned.  This is
  60    equivalent to the Scheme procedure (append list1 list2 ...) */
  61 SCM
  62 gh_append (SCM args)
  63 {
  64   return scm_append (args);
  65 }
  66
  67 SCM
  68 gh_append2 (SCM l1, SCM l2)
  69 {
  70   return scm_append (scm_list_2 (l1, l2));
  71 }
  72
  73 SCM
  74 gh_append3(SCM l1, SCM l2, SCM l3)
  75 {
  76   return scm_append (scm_list_3 (l1, l2, l3));
  77 }
  78
  79 SCM
  80 gh_append4 (SCM l1, SCM l2, SCM l3, SCM l4)
  81 {
  82   return scm_append (scm_list_4 (l1, l2, l3, l4));
  83 }
  84
  85 /* gh_reverse() is defined as a macro in gh.h */
  86 /* gh_list_tail() is defined as a macro in gh.h */
  87 /* gh_list_ref() is defined as a macro in gh.h */
  88 /* gh_memq() is defined as a macro in gh.h */
  89 /* gh_memv() is defined as a macro in gh.h */
  90 /* gh_member() is defined as a macro in gh.h */
  91 /* gh_assq() is defined as a macro in gh.h */
  92 /* gh_assv() is defined as a macro in gh.h */
  93 /* gh_assoc() is defined as a macro in gh.h */
  94
  95 /* analogous to the Scheme cons operator */
  96 SCM
  97 gh_cons (SCM x, SCM y)
  98 {
  99   return scm_cons (x, y);
 100 }
 101
 102 /* analogous to the Scheme car operator */
 103 SCM
 104 gh_car (SCM x)
 105 {
 106   return SCM_CAR (x);
 107 }
 108
 109 /* analogous to the Scheme cdr operator */
 110 SCM
 111 gh_cdr (SCM x)
 112 {
 113   return SCM_CDR (x);
 114 }
 115
 116 /* now for the multiple car/cdr utility procedures */
 117 SCM
 118 gh_caar (SCM x)
 119 {
 120   return SCM_CAAR (x);
 121 }
 122 SCM
 123 gh_cadr (SCM x)
 124 {
 125   return SCM_CADR (x);
 126 }
 127 SCM
 128 gh_cdar (SCM x)
 129 {
 130   return SCM_CDAR (x);
 131 }
 132 SCM
 133 gh_cddr (SCM x)
 134 {
 135   return SCM_CDDR (x);
 136 }
 137
 138 SCM
 139 gh_caaar (SCM x)
 140 {
 141   return SCM_CAAAR (x);
 142 }
 143 SCM
 144 gh_caadr (SCM x)
 145 {
 146   return SCM_CAADR (x);
 147 }
 148 SCM
 149 gh_cadar (SCM x)
 150 {
 151   return SCM_CADAR (x);
 152 }
 153 SCM
 154 gh_caddr (SCM x)
 155 {
 156   return SCM_CADDR (x);
 157 }
 158 SCM
 159 gh_cdaar (SCM x)
 160 {
 161   return SCM_CDAAR (x);
 162 }
 163 SCM
 164 gh_cdadr (SCM x)
 165 {
 166   return SCM_CDADR (x);
 167 }
 168 SCM
 169 gh_cddar (SCM x)
 170 {
 171   return SCM_CDDAR (x);
 172 }
 173 SCM
 174 gh_cdddr (SCM x)
 175 {
 176   return SCM_CDDDR (x);
 177 }
 178
 179 /* equivalent to (set-car! pair value) */
 180 SCM
 181 gh_set_car_x(SCM pair, SCM value)
 182 {
 183   return scm_set_car_x(pair, value);
 184 }
 185
 186 /* equivalent to (set-cdr! pair value) */
 187 SCM
 188 gh_set_cdr_x(SCM pair, SCM value)
 189 {
 190   return scm_set_cdr_x(pair, value);
 191 }
 192
 193 /*
 194   Local Variables:
 195   c-file-style: "gnu"
 196   End:
 197 */