/* 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 #include "_scm.h" #include "genio.h" #include "smob.h" #include "variable.h" #ifdef __STDC__ static scm_sizet free_var (SCM obj) #else static scm_sizet free_var (obj) SCM obj; #endif { return 0; } #ifdef __STDC__ static int prin_var (SCM exp, SCM port, int writing) #else static int prin_var (exp, port, writing) SCM exp; SCM port; int writing; #endif { scm_gen_puts (scm_regular_string, "#', port); return 1; } #ifdef __STDC__ static SCM scm_markvar (SCM ptr) #else static SCM scm_markvar (ptr) SCM ptr; #endif { if (SCM_GC8MARKP (ptr)) return SCM_BOOL_F; SCM_SETGC8MARK (ptr); return SCM_CDR (ptr); } int scm_tc16_variable; static scm_smobfuns variable_smob = {scm_markvar, free_var, prin_var, 0}; static SCM variable_sym; #ifdef __STDC__ static SCM make_vcell_variable (SCM vcell) #else static SCM make_vcell_variable (vcell) SCM vcell; #endif { SCM answer; SCM_NEWCELL(answer); SCM_REDEFER_INTS; SCM_CAR(answer) = scm_tc16_variable; SCM_CDR(answer) = vcell; SCM_REALLOW_INTS; return answer; } SCM_PROC(s_make_variable, "make-variable", 2, 0, 0, scm_make_variable); #ifdef __STDC__ SCM scm_make_variable (SCM init, SCM name_hint) #else SCM scm_make_variable (init, name_hint) SCM init; SCM name_hint; #endif { SCM val_cell; SCM_NEWCELL(val_cell); SCM_DEFER_INTS; SCM_CAR(val_cell) = name_hint; SCM_CDR(val_cell) = init; SCM_ALLOW_INTS; return make_vcell_variable (val_cell); } SCM_PROC(s_make_undefined_variable, "make-undefined-variable", 0, 1, 0, scm_make_undefined_variable); #ifdef __STDC__ SCM scm_make_undefined_variable (SCM name_hint) #else SCM scm_make_undefined_variable (name_hint) SCM name_hint; #endif { SCM vcell; if (name_hint == SCM_UNDEFINED) name_hint = variable_sym; SCM_NEWCELL (vcell); SCM_DEFER_INTS; SCM_CAR (vcell) = name_hint; SCM_CDR (vcell) = SCM_UNDEFINED; SCM_ALLOW_INTS; return make_vcell_variable (vcell); } SCM_PROC(s_variable_p, "variable?", 1, 0, 0, scm_variable_p); #ifdef __STDC__ SCM scm_variable_p (SCM obj) #else SCM scm_variable_p (obj) SCM obj; #endif { return ( (SCM_NIMP(obj) && SCM_VARIABLEP (obj)) ? SCM_BOOL_T : SCM_BOOL_F); } SCM_PROC(s_variable_ref, "variable-ref", 1, 0, 0, scm_variable_ref); #ifdef __STDC__ SCM scm_variable_ref (SCM var) #else SCM scm_variable_ref (var) SCM var; #endif { SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP(var), var, SCM_ARG1, s_variable_ref); return SCM_CDR (SCM_CDR (var)); } SCM_PROC(s_variable_set_x, "variable-set!", 2, 0, 0, scm_variable_set_x); #ifdef __STDC__ SCM scm_variable_set_x (SCM var, SCM val) #else SCM scm_variable_set_x (var, val) SCM var; SCM val; #endif { SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP (var), var, SCM_ARG1, s_variable_set_x); SCM_CDR (SCM_CDR (var)) = val; return SCM_UNSPECIFIED; } SCM_PROC(s_builtin_variable, "builtin-variable", 1, 0, 0, scm_builtin_variable); #ifdef __STDC__ SCM scm_builtin_variable (SCM name) #else SCM scm_builtin_variable (name) SCM name; #endif { SCM vcell; SCM var_slot; SCM_ASSERT (SCM_NIMP (name) && SCM_SYMBOLP (name), name, SCM_ARG1, s_builtin_variable); vcell = scm_sym2vcell (name, SCM_BOOL_F, SCM_BOOL_T); if (vcell == SCM_BOOL_F) return SCM_BOOL_F; scm_intern_symbol (scm_symhash_vars, name); var_slot = scm_sym2ovcell (name, scm_symhash_vars); SCM_DEFER_INTS; if ( SCM_IMP (SCM_CDR (var_slot)) || (SCM_VARVCELL (var_slot) != vcell)) SCM_CDR (var_slot) = make_vcell_variable (vcell); SCM_ALLOW_INTS; return SCM_CDR (var_slot); } SCM_PROC(s_variable_bound_p, "variable-bound?", 1, 0, 0, scm_variable_bound_p); #ifdef __STDC__ SCM scm_variable_bound_p (SCM var) #else SCM scm_variable_bound_p (var) SCM var; #endif { SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP (var), var, SCM_ARG1, s_variable_bound_p); return (SCM_UNBNDP (SCM_CDR (SCM_VARVCELL (var))) ? SCM_BOOL_F : SCM_BOOL_T); } #ifdef __STDC__ void scm_init_variable (void) #else void scm_init_variable () #endif { scm_tc16_variable = scm_newsmob (&variable_smob); variable_sym = SCM_CAR (scm_sysintern ("anonymous-variable", SCM_UNDEFINED)); #include "variable.x" }