libguile/procs.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
  47 \f
  48
  49
  50 /* {Procedures}
  51  */
  52
  53 #ifdef __STDC__
  54 SCM
  55 scm_make_subr_opt (char *name, int type, SCM (*fcn) (), int set)
  56 #else
  57 SCM
  58 scm_make_subr_opt (name, type, fcn, set)
  59      char *name;
  60      int type;
  61      SCM (*fcn) ();
  62      int set;
  63 #endif
  64 {
  65   SCM symcell;
  66   long tmp;
  67   register SCM z;
  68   symcell = scm_sysintern (name, SCM_UNDEFINED);
  69   tmp = ((((SCM_CELLPTR) (SCM_CAR (symcell))) - scm_heap_org) << 8);
  70   if ((tmp >> 8) != ((SCM_CELLPTR) (SCM_CAR (symcell)) - scm_heap_org))
  71     tmp = 0;
  72   SCM_NEWCELL (z);
  73   SCM_SUBRF (z) = fcn;
  74   SCM_CAR (z) = tmp + type;
  75   if (set)
  76     SCM_CDR (symcell) = z;
  77   return z;
  78 }
  79
  80
  81 #ifdef __STDC__
  82 SCM
  83 scm_make_subr (char *name, int type, SCM (*fcn) ())
  84 #else
  85 SCM
  86 scm_make_subr (name, type, fcn)
  87      char *name;
  88      int type;
  89      SCM (*fcn) ();
  90 #endif
  91 {
  92   return scm_make_subr_opt (name, type, fcn, 1);
  93 }
  94
  95 #ifdef CCLO
  96 #ifdef __STDC__
  97 SCM
  98 scm_makcclo (SCM proc, long len)
  99 #else
 100 SCM
 101 scm_makcclo (proc, len)
 102      SCM proc;
 103      long len;
 104 #endif
 105 {
 106   SCM s;
 107   SCM_NEWCELL (s);
 108   SCM_DEFER_INTS;
 109   SCM_SETCHARS (s, scm_must_malloc (len * sizeof (SCM), "compiled-closure"));
 110   SCM_SETLENGTH (s, len, scm_tc7_cclo);
 111   while (--len)
 112     SCM_VELTS (s)[len] = SCM_UNSPECIFIED;
 113   SCM_CCLO_SUBR (s) = proc;
 114   SCM_ALLOW_INTS;
 115   return s;
 116 }
 117 #endif
 118
 119
 120
 121 SCM_PROC(s_procedure_p, "procedure?", 1, 0, 0, scm_procedure_p);
 122 #ifdef __STDC__
 123 SCM
 124 scm_procedure_p (SCM obj)
 125 #else
 126 SCM
 127 scm_procedure_p (obj)
 128      SCM obj;
 129 #endif
 130 {
 131   if (SCM_NIMP (obj))
 132     switch (SCM_TYP7 (obj))
 133       {
 134       case scm_tcs_closures:
 135       case scm_tc7_contin:
 136       case scm_tcs_subrs:
 137 #ifdef CCLO
 138       case scm_tc7_cclo:
 139 #endif
 140         return SCM_BOOL_T;
 141       default:
 142         return SCM_BOOL_F;
 143       }
 144   return SCM_BOOL_F;
 145 }
 146
 147
 148 #ifdef __STDC__
 149 void
 150 scm_init_iprocs(scm_iproc *subra, int type)
 151 #else
 152 void
 153 scm_init_iprocs(subra, type)
 154      scm_iproc *subra;
 155      int type;
 156 #endif
 157 {
 158   for(;subra->scm_string; subra++)
 159     scm_make_subr(subra->scm_string,
 160                   type,
 161                   subra->cproc);
 162 }
 163
 164
 165
 166
 167 #ifdef __STDC__
 168 void
 169 scm_init_procs (void)
 170 #else
 171 void
 172 scm_init_procs ()
 173 #endif
 174 {
 175 #include "procs.x"
 176 }
 177