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Diffstat (limited to 'libguile/gsubr.c')
-rw-r--r-- | libguile/gsubr.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/libguile/gsubr.c b/libguile/gsubr.c new file mode 100644 index 000000000..2f1cc75e9 --- /dev/null +++ b/libguile/gsubr.c @@ -0,0 +1,195 @@ +/* Copyright (C) 1995,1996 Free Software Foundation, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this software; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + * + * As a special exception, the Free Software Foundation gives permission + * for additional uses of the text contained in its release of GUILE. + * + * The exception is that, if you link the GUILE library with other files + * to produce an executable, this does not by itself cause the + * resulting executable to be covered by the GNU General Public License. + * Your use of that executable is in no way restricted on account of + * linking the GUILE library code into it. + * + * This exception does not however invalidate any other reasons why + * the executable file might be covered by the GNU General Public License. + * + * This exception applies only to the code released by the + * Free Software Foundation under the name GUILE. If you copy + * code from other Free Software Foundation releases into a copy of + * GUILE, as the General Public License permits, the exception does + * not apply to the code that you add in this way. To avoid misleading + * anyone as to the status of such modified files, you must delete + * this exception notice from them. + * + * If you write modifications of your own for GUILE, it is your choice + * whether to permit this exception to apply to your modifications. + * If you do not wish that, delete this exception notice. + */ + + +#include <stdio.h> +#include "_scm.h" + + +/* + * gsubr.c + * Provide `gsubrs' -- subrs taking a prescribed number of required, optional, + * and rest arguments. + */ + +#include "gsubr.h" + +#define GSUBR_TEST 1 + +#define GSUBR_MAKTYPE(req, opt, rst) ((req)|((opt)<<4)|((rst)<<8)) +#define GSUBR_REQ(x) ((int)(x)&0xf) +#define GSUBR_OPT(x) (((int)(x)&0xf0)>>4) +#define GSUBR_REST(x) ((int)(x)>>8) + +#define GSUBR_MAX 10 +#define GSUBR_TYPE(cclo) (SCM_VELTS(cclo)[1]) +#define GSUBR_PROC(cclo) (SCM_VELTS(cclo)[2]) + +static SCM f_gsubr_apply; +#ifdef __STDC__ +SCM +scm_make_gsubr(char *name, int req, int opt, int rst, SCM (*fcn)()) +#else +SCM +scm_make_gsubr(name, req, opt, rst, fcn) + char *name; + int req; + int opt; + int rst; + SCM (*fcn)(); +#endif +{ + switch GSUBR_MAKTYPE(req, opt, rst) { + case GSUBR_MAKTYPE(0, 0, 0): return scm_make_subr(name, scm_tc7_subr_0, fcn); + case GSUBR_MAKTYPE(1, 0, 0): return scm_make_subr(name, scm_tc7_subr_1, fcn); + case GSUBR_MAKTYPE(0, 1, 0): return scm_make_subr(name, scm_tc7_subr_1o, fcn); + case GSUBR_MAKTYPE(1, 1, 0): return scm_make_subr(name, scm_tc7_subr_2o, fcn); + case GSUBR_MAKTYPE(2, 0, 0): return scm_make_subr(name, scm_tc7_subr_2, fcn); + case GSUBR_MAKTYPE(3, 0, 0): return scm_make_subr(name, scm_tc7_subr_3, fcn); + case GSUBR_MAKTYPE(0, 0, 1): return scm_make_subr(name, scm_tc7_lsubr, fcn); + case GSUBR_MAKTYPE(2, 0, 1): return scm_make_subr(name, scm_tc7_lsubr_2, fcn); + default: + { + SCM symcell = scm_sysintern(name, SCM_UNDEFINED); + SCM z, cclo = scm_makcclo(f_gsubr_apply, 3L); + long tmp = ((((SCM_CELLPTR)(SCM_CAR(symcell)))-scm_heap_org)<<8); + if (GSUBR_MAX < req + opt + rst) { + fputs("ERROR in scm_make_gsubr: too many args\n", stderr); + exit (1); + } + if ((tmp>>8) != ((SCM_CELLPTR)(SCM_CAR(symcell))-scm_heap_org)) + tmp = 0; + SCM_NEWCELL(z); + SCM_SUBRF(z) = fcn; + SCM_CAR(z) = tmp + scm_tc7_subr_0; + GSUBR_PROC(cclo) = z; + GSUBR_TYPE(cclo) = SCM_MAKINUM(GSUBR_MAKTYPE(req, opt, rst)); + SCM_CDR(symcell) = cclo; + return cclo; + } + } +} + + +SCM_PROC(s_gsubr_apply, "gsubr-apply", 0, 0, 1, scm_gsubr_apply); +#ifdef __STDC__ +SCM +scm_gsubr_apply(SCM args) +#else +SCM +scm_gsubr_apply(args) + SCM args; +#endif +{ + SCM self = SCM_CAR(args); + SCM (*fcn)() = SCM_SUBRF(GSUBR_PROC(self)); + SCM v[10]; /* must agree with greatest supported arity */ + int typ = SCM_INUM(GSUBR_TYPE(self)); + int i, n = GSUBR_REQ(typ) + GSUBR_OPT(typ) + GSUBR_REST(typ); + args = SCM_CDR(args); + for (i = 0; i < GSUBR_REQ(typ); i++) { +#ifndef RECKLESS + if (SCM_IMP(args)) + scm_wta(SCM_UNDEFINED, (char *)SCM_WNA, SCM_CHARS(SCM_SNAME(GSUBR_PROC(self)))); +#endif + v[i] = SCM_CAR(args); + args = SCM_CDR(args); + } + for (; i < GSUBR_REQ(typ) + GSUBR_OPT(typ); i++) { + if (SCM_NIMP(args)) { + v[i] = SCM_CAR(args); + args = SCM_CDR(args); + } + else + v[i] = SCM_UNDEFINED; + } + if (GSUBR_REST(typ)) + v[i] = args; + switch (n) { + default: scm_wta(self, "internal programming error", s_gsubr_apply); + case 2: return (*fcn)(v[0], v[1]); + case 3: return (*fcn)(v[0], v[1], v[2]); + case 4: return (*fcn)(v[0], v[1], v[2], v[3]); + case 5: return (*fcn)(v[0], v[1], v[2], v[3], v[4]); + case 6: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5]); + case 7: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6]); + case 8: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7]); + case 9: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8]); + case 10: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9]); + } +} + + +#ifdef GSUBR_TEST +/* A silly example, taking 2 required args, 1 optional, and + a scm_list of rest args + */ +SCM +gsubr_21l(req1, req2, opt, rst) + SCM req1, req2, opt, rst; +{ + scm_gen_puts (scm_regular_string, "gsubr-2-1-l:\n req1: ", scm_cur_outp); + scm_display(req1, scm_cur_outp); + scm_gen_puts (scm_regular_string, "\n req2: ", scm_cur_outp); + scm_display(req2, scm_cur_outp); + scm_gen_puts (scm_regular_string, "\n opt: ", scm_cur_outp); + scm_display(opt, scm_cur_outp); + scm_gen_puts (scm_regular_string, "\n rest: ", scm_cur_outp); + scm_display(rst, scm_cur_outp); + scm_newline(scm_cur_outp); + return SCM_UNSPECIFIED; +} +#endif + + +#ifdef __STDC__ +void +scm_init_gsubr(void) +#else +void +scm_init_gsubr() +#endif +{ + f_gsubr_apply = scm_make_subr(s_gsubr_apply, scm_tc7_lsubr, scm_gsubr_apply); +#ifdef GSUBR_TEST + scm_make_gsubr("gsubr-2-1-l", 2, 1, 1, gsubr_21l); /* example */ +#endif +} |