1 files changed, 108 insertions, 0 deletions
diff --git a/contrib/bc/dc/array.c b/contrib/bc/dc/array.c
new file mode 100644
index 0000000..2fc1b7e
--- /dev/null
+++ b/contrib/bc/dc/array.c
@@ -0,0 +1,108 @@
+/* 
+ * implement arrays for dc
+ *
+ * Copyright (C) 1994 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 program; if not, you can either send email to this
+ * program's author (see below) or write to: The Free Software Foundation,
+ * Inc.; 675 Mass Ave. Cambridge, MA 02139, USA.
+ */
+
+/* This module is the only one that knows what arrays look like. */
+
+#include "config.h"
+
+#include <stdio.h>	/* "dc-proto.h" wants this */
+#ifdef HAVE_STDLIB_H
+/* get size_t definition from "almost ANSI" compiling environments. */
+#include <stdlib.h>
+#endif
+#include "dc.h"
+#include "dc-proto.h"
+#include "dc-regdef.h"
+
+/* what's most useful: quick access or sparse arrays? */
+/* I'll go with sparse arrays for now */
+struct dc_array {
+	int Index;
+	dc_data value;
+	struct dc_array *next;
+};
+typedef struct dc_array dc_array;
+
+/* I can find no reason not to place arrays in their own namespace... */
+static dc_array *dc_array_register[DC_REGCOUNT];
+
+
+/* initialize the arrays to their initial values */
+void
+dc_array_init DC_DECLVOID()
+{
+	int i;
+
+	for (i=0; i<DC_REGCOUNT; ++i)
+		dc_array_register[i] = NULL;
+}
+
+/* store value into array_id[Index] */
+void
+dc_array_set DC_DECLARG((array_id, Index, value))
+	int array_id DC_DECLSEP
+	int Index DC_DECLSEP
+	dc_data value DC_DECLEND
+{
+	dc_array *cur;
+	dc_array *prev=NULL;
+	dc_array *newentry;
+
+	array_id = regmap(array_id);
+	cur = dc_array_register[array_id];
+	while (cur && cur->Index < Index){
+		prev = cur;
+		cur = cur->next;
+	}
+	if (cur && cur->Index == Index){
+		if (cur->value.dc_type == DC_NUMBER)
+			dc_free_num(&cur->value.v.number);
+		else if (cur->value.dc_type == DC_STRING)
+			dc_free_str(&cur->value.v.string);
+		else
+			dc_garbage(" in array", array_id);
+		cur->value = value;
+	}else{
+		newentry = dc_malloc(sizeof *newentry);
+		newentry->Index = Index;
+		newentry->value = value;
+		newentry->next = cur;
+		if (prev)
+			prev->next = newentry;
+		else
+			dc_array_register[array_id] = newentry;
+	}
+}
+
+/* retrieve a dup of a value from array_id[Index] */
+/* A zero value is returned if the specified value is unintialized. */
+dc_data
+dc_array_get DC_DECLARG((array_id, Index))
+	int array_id DC_DECLSEP
+	int Index DC_DECLEND
+{
+	dc_array *cur;
+
+	for (cur=dc_array_register[regmap(array_id)]; cur; cur=cur->next)
+		if (cur->Index == Index)
+			return dc_dup(cur->value);
+	return dc_int2data(0);
+}