libguile/gsubr.c

   1 /*      Copyright (C) 1995,1996, 1997 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 #include <stdio.h>
  44 #include "_scm.h"
  45 #include "genio.h"
  46 #include "procprop.h"
  47
  48 #include "gsubr.h"
  49 \f
  50 /*
  51  * gsubr.c
  52  * Provide `gsubrs' -- subrs taking a prescribed number of required, optional,
  53  * and rest arguments.
  54  */
  55
  56 #include "gsubr.h"
  57
  58 #define GSUBR_TEST 1
  59
  60 SCM scm_i_name;
  61 SCM scm_i_inner_name;
  62 SCM scm_f_gsubr_apply;
  63
  64 SCM
  65 scm_make_gsubr(name, req, opt, rst, fcn)
  66      char *name;
  67      int req;
  68      int opt;
  69      int rst;
  70      SCM (*fcn)();
  71 {
  72   switch SCM_GSUBR_MAKTYPE(req, opt, rst) {
  73   case SCM_GSUBR_MAKTYPE(0, 0, 0): return scm_make_subr(name, scm_tc7_subr_0, fcn);
  74   case SCM_GSUBR_MAKTYPE(1, 0, 0): return scm_make_subr(name, scm_tc7_subr_1, fcn);
  75   case SCM_GSUBR_MAKTYPE(0, 1, 0): return scm_make_subr(name, scm_tc7_subr_1o, fcn);
  76   case SCM_GSUBR_MAKTYPE(1, 1, 0): return scm_make_subr(name, scm_tc7_subr_2o, fcn);
  77   case SCM_GSUBR_MAKTYPE(2, 0, 0): return scm_make_subr(name, scm_tc7_subr_2, fcn);
  78   case SCM_GSUBR_MAKTYPE(3, 0, 0): return scm_make_subr(name, scm_tc7_subr_3, fcn);
  79   case SCM_GSUBR_MAKTYPE(0, 0, 1): return scm_make_subr(name, scm_tc7_lsubr, fcn);
  80   case SCM_GSUBR_MAKTYPE(2, 0, 1): return scm_make_subr(name, scm_tc7_lsubr_2, fcn);
  81   default:
  82     {
  83       SCM symcell = scm_sysintern(name, SCM_UNDEFINED);
  84       SCM z, cclo = scm_makcclo(scm_f_gsubr_apply, 3L);
  85       long tmp = ((((SCM_CELLPTR)(SCM_CAR(symcell)))-scm_heap_org)<<8);
  86       if (SCM_GSUBR_MAX < req + opt + rst) {
  87         fputs("ERROR in scm_make_gsubr: too many args\n", stderr);
  88         exit (1);
  89       }
  90       if ((tmp>>8) != ((SCM_CELLPTR)(SCM_CAR(symcell))-scm_heap_org))
  91         tmp = 0;
  92       SCM_NEWCELL(z);
  93       SCM_SUBRF(z) = fcn;
  94       SCM_SETCAR (z, tmp + scm_tc7_subr_0);
  95       SCM_GSUBR_PROC(cclo) = z;
  96       SCM_GSUBR_TYPE(cclo) = SCM_MAKINUM(SCM_GSUBR_MAKTYPE(req, opt, rst));
  97       SCM_SETCDR (symcell, cclo);
  98 #ifdef DEBUG_EXTENSIONS
  99       if (SCM_REC_PROCNAMES_P)
 100         scm_set_procedure_property_x (cclo, scm_i_name, SCM_CAR (symcell));
 101 #endif
 102       return cclo;
 103     }
 104   }
 105 }
 106
 107
 108 SCM_PROC(s_gsubr_apply, "gsubr-apply", 0, 0, 1, scm_gsubr_apply);
 109
 110 SCM
 111 scm_gsubr_apply(args)
 112      SCM args;
 113 {
 114   SCM self = SCM_CAR(args);
 115   SCM (*fcn)() = SCM_SUBRF(SCM_GSUBR_PROC(self));
 116   SCM v[10];                    /* must agree with greatest supported arity */
 117   int typ = SCM_INUM(SCM_GSUBR_TYPE(self));
 118   int i, n = SCM_GSUBR_REQ(typ) + SCM_GSUBR_OPT(typ) + SCM_GSUBR_REST(typ);
 119 #if 0
 120   SCM_ASSERT(n <= sizeof(v)/sizeof(SCM),
 121              self, "internal programming error", s_gsubr_apply);
 122 #endif
 123   args = SCM_CDR(args);
 124   for (i = 0; i < SCM_GSUBR_REQ(typ); i++) {
 125 #ifndef RECKLESS
 126     if (SCM_IMP(args))
 127       wnargs: scm_wrong_num_args (SCM_SNAME(SCM_GSUBR_PROC(self)));
 128 #endif
 129     v[i] = SCM_CAR(args);
 130     args = SCM_CDR(args);
 131   }
 132   for (; i < SCM_GSUBR_REQ(typ) + SCM_GSUBR_OPT(typ); i++) {
 133     if (SCM_NIMP(args)) {
 134       v[i] = SCM_CAR(args);
 135       args = SCM_CDR(args);
 136     }
 137     else
 138       v[i] = SCM_UNDEFINED;
 139   }
 140   if (SCM_GSUBR_REST(typ))
 141     v[i] = args;
 142   else
 143     SCM_ASRTGO(SCM_NULLP(args), wnargs);
 144   switch (n) {
 145   case 2: return (*fcn)(v[0], v[1]);
 146   case 3: return (*fcn)(v[0], v[1], v[2]);
 147   case 4: return (*fcn)(v[0], v[1], v[2], v[3]);
 148   case 5: return (*fcn)(v[0], v[1], v[2], v[3], v[4]);
 149   case 6: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5]);
 150   case 7: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6]);
 151   case 8: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7]);
 152   case 9: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8]);
 153   case 10: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9]);
 154   }
 155   return 0; /* Never reached. */
 156 }
 157
 158
 159 #ifdef GSUBR_TEST
 160 /* A silly example, taking 2 required args, 1 optional, and
 161    a scm_list of rest args
 162    */
 163 SCM
 164 gsubr_21l(req1, req2, opt, rst)
 165      SCM req1, req2, opt, rst;
 166 {
 167   scm_puts ("gsubr-2-1-l:\n req1: ", scm_cur_outp);
 168   scm_display(req1, scm_cur_outp);
 169   scm_puts ("\n req2: ", scm_cur_outp);
 170   scm_display(req2, scm_cur_outp);
 171   scm_puts ("\n opt: ", scm_cur_outp);
 172   scm_display(opt, scm_cur_outp);
 173   scm_puts ("\n rest: ", scm_cur_outp);
 174   scm_display(rst, scm_cur_outp);
 175   scm_newline(scm_cur_outp);
 176   return SCM_UNSPECIFIED;
 177 }
 178 #endif
 179
 180
 181
 182 void
 183 scm_init_gsubr()
 184 {
 185   scm_f_gsubr_apply = scm_make_subr(s_gsubr_apply, scm_tc7_lsubr, scm_gsubr_apply);
 186   scm_i_name = SCM_CAR (scm_sysintern ("name", SCM_UNDEFINED));
 187   scm_permanent_object (scm_i_name);
 188   scm_i_inner_name = SCM_CAR (scm_sysintern ("inner-name", SCM_UNDEFINED));
 189   scm_permanent_object (scm_i_inner_name);
 190 #ifdef GSUBR_TEST
 191   scm_make_gsubr("gsubr-2-1-l", 2, 1, 1, gsubr_21l); /* example */
 192 #endif
 193 }