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tabexp.c

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+/*
+ * Copyright 2008-2013 Various Authors
+ * Copyright 2004 Timo Hirvonen
+ *
+ * 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 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 "tabexp.h"
+#include "xmalloc.h"
+#include "xstrjoin.h"
+#include "debug.h"
+
+#include <stdlib.h>
+
+struct tabexp tabexp = {
+	.head = NULL,
+	.tails = NULL,
+	.count = 0
+};
+
+char *tabexp_expand(const char *src, void (*load_matches)(const char *src), int direction)
+{
+	static int idx = -1;
+	char *expanded;
+
+	if (tabexp.tails == NULL) {
+		load_matches(src);
+		if (tabexp.tails == NULL) {
+			BUG_ON(tabexp.head != NULL);
+			return NULL;
+		}
+		BUG_ON(tabexp.head == NULL);
+		idx = -1;
+	}
+	idx += direction;
+
+	if (idx >= tabexp.count)
+		idx = 0;
+	else if (idx < 0)
+		idx = tabexp.count - 1;
+
+	expanded = xstrjoin(tabexp.head, tabexp.tails[idx]);
+	if (tabexp.count == 1)
+		tabexp_reset();
+	return expanded;
+}
+
+void tabexp_reset(void)
+{
+	int i;
+	for (i = 0; i < tabexp.count; i++)
+		free(tabexp.tails[i]);
+	free(tabexp.tails);
+	free(tabexp.head);
+	tabexp.tails = NULL;
+	tabexp.head = NULL;
+	tabexp.count = 0;
+}