libguile/smob.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
  43 #include <stdio.h>
  44 #include "_scm.h"
  45
  46 #include "smob.h"
  47
  48 #ifdef HAVE_MALLOC_H
  49 #include <malloc.h>
  50 #endif
  51
  52 \f
  53
  54 /* scm_smobs scm_numsmob
  55  * implement a dynamicly resized array of smob records.
  56  * Indexes into this table are used when generating type
  57  * tags for smobjects (if you know a tag you can get an index and conversely).
  58  */
  59 scm_sizet scm_numsmob;
  60 scm_smobfuns *scm_smobs;
  61
  62 #ifdef __STDC__
  63 long
  64 scm_newsmob (scm_smobfuns *smob)
  65 #else
  66 long
  67 scm_newsmob (smob)
  68      scm_smobfuns *smob;
  69 #endif
  70 {
  71   char *tmp;
  72   if (255 <= scm_numsmob)
  73     goto smoberr;
  74   SCM_DEFER_INTS;
  75   SCM_SYSCALL (tmp = (char *) realloc ((char *) scm_smobs, (1 + scm_numsmob) * sizeof (scm_smobfuns)));
  76   if (tmp)
  77     {
  78       scm_smobs = (scm_smobfuns *) tmp;
  79       scm_smobs[scm_numsmob].mark = smob->mark;
  80       scm_smobs[scm_numsmob].free = smob->free;
  81       scm_smobs[scm_numsmob].print = smob->print;
  82       scm_smobs[scm_numsmob].equalp = smob->equalp;
  83       scm_numsmob++;
  84     }
  85   SCM_ALLOW_INTS;
  86   if (!tmp)
  87   smoberr:scm_wta (SCM_MAKINUM ((long) scm_numsmob), (char *) SCM_NALLOC, "newsmob");
  88   return scm_tc7_smob + (scm_numsmob - 1) * 256;
  89 }
  90
  91 /* {Initialization for i/o types, float, bignum, the type of free cells}
  92  */
  93
  94 static scm_smobfuns freecell =
  95 {
  96   scm_mark0,
  97   scm_free0,
  98   0,
  99   0
 100 };
 101
 102 static scm_smobfuns flob =
 103 {
 104   scm_mark0,
 105   /*flofree*/ 0,
 106   scm_floprint,
 107   scm_floequal
 108 };
 109
 110 static scm_smobfuns bigob =
 111 {
 112   scm_mark0,
 113   /*bigfree*/ 0,
 114   scm_bigprint,
 115   scm_bigequal
 116 };
 117
 118
 119
 120 #ifdef __STDC__
 121 void
 122 scm_smob_prehistory (void)
 123 #else
 124 void
 125 scm_smob_prehistory ()
 126 #endif
 127 {
 128   scm_numsmob = 0;
 129   scm_smobs = (scm_smobfuns *) malloc (7 * sizeof (scm_smobfuns));
 130
 131   /* WARNING: These scm_newsmob calls must be done in this order */
 132   scm_newsmob (&freecell);
 133   scm_newsmob (&flob);
 134   scm_newsmob (&bigob);
 135   scm_newsmob (&bigob);         /* n.b.: two smobs, one smobfuns */
 136 }
 137