--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lwcc/symbol.c	Sat Sep 14 20:04:38 2013 -0600
@@ -0,0 +1,92 @@
+/*
+lwcc/symbol.c
+
+Copyright © 2013 William Astle
+
+This file is part of LWTOOLS.
+
+LWTOOLS 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 3 of the License, 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 program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <string.h>
+
+#include <lw_alloc.h>
+#include <lw_string.h>
+
+#include "cpp.h"
+#include "symbol.h"
+#include "token.h"
+
+void symbol_free(struct symtab_e *s)
+{
+	int i;
+	struct token *t;
+	
+	lw_free(s -> name);
+	
+	for (i = 0; i < s -> nargs; i++)
+		lw_free(s -> params[i]);
+	lw_free(s -> params);
+	while (s -> tl)
+	{
+		t = s -> tl;
+		s -> tl = t -> next;
+		token_free(t);
+	}
+}
+
+struct symtab_e *symtab_find(struct preproc_info *pp, char *name)
+{
+	struct symtab_e *s;
+	
+	for (s = pp -> sh; s; s = s -> next)
+	{
+		if (strcmp(s -> name, name) == 0)
+		{
+			return s;
+		}
+	}
+	return NULL;
+}
+
+void symtab_undef(struct preproc_info *pp, char *name)
+{
+	struct symtab_e *s, **p;
+	
+	p = &(pp -> sh);
+	for (s = pp -> sh; s; s = s -> next)
+	{
+		if (strcmp(s -> name, name) == 0)
+		{
+			(*p) -> next = s -> next;
+			symbol_free(s);
+			return;
+		}
+		p = &((*p) -> next);
+	}
+}
+
+void symtab_define(struct preproc_info *pp, char *name, struct token *def, int nargs, char **params, int vargs)
+{
+	struct symtab_e *s;
+	
+	s = lw_alloc(sizeof(struct symtab_e));
+	s -> name = lw_strdup(name);
+	s -> tl = def;
+	s -> nargs = nargs;
+	s -> params = params;
+	s -> vargs = vargs;
+	s -> next = pp -> sh;
+	pp -> sh = s;
+}