libguile/eq.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, 675 Mass Ave, Cambridge, MA 02139, USA.
  16  *
  17  * As a special exception, the Free Software Foundation gives permission
  18  * for additional uses of the text contained in its release of GUILE.
  19  *
  20  * The exception is that, if you link the GUILE library with other files
  21  * to produce an executable, this does not by itself cause the
  22  * resulting executable to be covered by the GNU General Public License.
  23  * Your use of that executable is in no way restricted on account of
  24  * linking the GUILE library code into it.
  25  *
  26  * This exception does not however invalidate any other reasons why
  27  * the executable file might be covered by the GNU General Public License.
  28  *
  29  * This exception applies only to the code released by the
  30  * Free Software Foundation under the name GUILE.  If you copy
  31  * code from other Free Software Foundation releases into a copy of
  32  * GUILE, as the General Public License permits, the exception does
  33  * not apply to the code that you add in this way.  To avoid misleading
  34  * anyone as to the status of such modified files, you must delete
  35  * this exception notice from them.
  36  *
  37  * If you write modifications of your own for GUILE, it is your choice
  38  * whether to permit this exception to apply to your modifications.
  39  * If you do not wish that, delete this exception notice.
  40  */
  41 \f
  42 #include <stdio.h>
  43 #include "_scm.h"
  44 #include "ramap.h"
  45 #include "stackchk.h"
  46 #include "strorder.h"
  47 #include "smob.h"
  48 #include "unif.h"
  49
  50 #include "eq.h"
  51 \f
  52 SCM_PROC1 (s_eq_p, "eq?", scm_tc7_rpsubr, scm_eq_p);
  53
  54 SCM
  55 scm_eq_p (x, y)
  56      SCM x;
  57      SCM y;
  58 {
  59   return ((x==y)
  60           ? SCM_BOOL_T
  61           : SCM_BOOL_F);
  62 }
  63
  64
  65 SCM_PROC1 (s_eqv_p, "eqv?", scm_tc7_rpsubr, scm_eqv_p);
  66
  67 SCM
  68 scm_eqv_p (x, y)
  69      SCM x;
  70      SCM y;
  71 {
  72   if (x==y) return SCM_BOOL_T;
  73   if SCM_IMP(x) return SCM_BOOL_F;
  74   if SCM_IMP(y) return SCM_BOOL_F;
  75   /* this ensures that types and scm_length are the same. */
  76   if (SCM_CAR(x) != SCM_CAR(y)) return SCM_BOOL_F;
  77   if SCM_NUMP(x) {
  78 # ifdef SCM_BIGDIG
  79     if SCM_BIGP(x) return (0==scm_bigcomp(x, y)) ? SCM_BOOL_T : SCM_BOOL_F;
  80 # endif
  81 #ifdef SCM_FLOATS
  82     if (SCM_REALPART(x) != SCM_REALPART(y)) return SCM_BOOL_F;
  83     if (SCM_CPLXP(x) && (SCM_IMAG(x) != SCM_IMAG(y))) return SCM_BOOL_F;
  84 #endif
  85     return SCM_BOOL_T;
  86   }
  87   return SCM_BOOL_F;
  88 }
  89
  90
  91 SCM_PROC1 (s_equal_p, "equal?", scm_tc7_rpsubr, scm_equal_p);
  92
  93 SCM
  94 scm_equal_p (x, y)
  95      SCM x;
  96      SCM y;
  97 {
  98   SCM_CHECK_STACK;
  99  tailrecurse: SCM_ASYNC_TICK;
 100         if (x==y) return SCM_BOOL_T;
 101         if (SCM_IMP(x)) return SCM_BOOL_F;
 102         if (SCM_IMP(y)) return SCM_BOOL_F;
 103         if (SCM_CONSP(x) && SCM_CONSP(y)) {
 104                 if SCM_FALSEP(scm_equal_p(SCM_CAR(x), SCM_CAR(y))) return SCM_BOOL_F;
 105                 x = SCM_CDR(x);
 106                 y = SCM_CDR(y);
 107                 goto tailrecurse;
 108         }
 109         /* this ensures that types and scm_length are the same. */
 110         if (SCM_CAR(x) != SCM_CAR(y)) return SCM_BOOL_F;
 111         switch (SCM_TYP7(x)) {
 112         default: return SCM_BOOL_F;
 113         case scm_tc7_substring:
 114         case scm_tc7_mb_substring:
 115         case scm_tc7_mb_string:
 116         case scm_tc7_string: return scm_string_equal_p(x, y);
 117         case scm_tc7_vector:
 118         case scm_tc7_wvect:
 119           return scm_vector_equal_p(x, y);
 120         case scm_tc7_smob: {
 121                 int i = SCM_SMOBNUM(x);
 122                 if (!(i < scm_numsmob)) return SCM_BOOL_F;
 123                 if (scm_smobs[i].equalp)
 124                   return (scm_smobs[i].equalp)(x, y);
 125                 else
 126                   return SCM_BOOL_F;
 127               }
 128         case scm_tc7_bvect: case scm_tc7_uvect: case scm_tc7_ivect:
 129         case scm_tc7_fvect:     case scm_tc7_cvect: case scm_tc7_dvect:
 130         case scm_tc7_svect:
 131 #ifdef LONGLONGS
 132         case scm_tc7_llvect:
 133 #endif
 134         case scm_tc7_byvect:
 135           if (   scm_tc16_array
 136               && scm_smobs[0x0ff & (scm_tc16_array >> 8)].equalp)
 137             return scm_array_equal_p(x, y);
 138         }
 139         return SCM_BOOL_F;
 140 }
 141
 142
 143 \f
 144
 145
 146
 147 void
 148 scm_init_eq ()
 149 {
 150 #include "eq.x"
 151 }
 152