Initial import of csup.

1 files changed, 90 insertions, 0 deletions

diff --git a/contrib/csup/attrstack.c b/contrib/csup/attrstack.c
new file mode 100644
index 0000000..f5f56b3
--- /dev/null
+++ b/contrib/csup/attrstack.c
@@ -0,0 +1,90 @@
+/*-
+ * Copyright (c) 2006, Maxime Henrion <mux@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $Id$
+ */
+
+#include <assert.h>
+#include <stdlib.h>
+
+#include "attrstack.h"
+#include "fattr.h"
+#include "misc.h"
+
+#define	ATTRSTACK_DEFSIZE	16	/* Initial size of the stack. */
+
+struct attrstack {
+	struct fattr **stack;
+	size_t cur;
+	size_t size;
+};
+
+struct attrstack *
+attrstack_new(void)
+{
+	struct attrstack *as;
+
+	as = xmalloc(sizeof(struct attrstack));
+	as->stack = xmalloc(sizeof(struct fattr *) * ATTRSTACK_DEFSIZE);
+	as->size = ATTRSTACK_DEFSIZE;
+	as->cur = 0;
+	return (as);
+}
+
+struct fattr *
+attrstack_pop(struct attrstack *as)
+{
+
+	assert(as->cur > 0);
+	return (as->stack[--as->cur]);
+}
+
+void
+attrstack_push(struct attrstack *as, struct fattr *fa)
+{
+
+	if (as->cur >= as->size) {
+		as->size *= 2;
+		as->stack = xrealloc(as->stack,
+		    sizeof(struct fattr *) * as->size);
+	}
+	as->stack[as->cur++] = fa;
+}
+
+size_t
+attrstack_size(struct attrstack *as)
+{
+
+	return (as->cur);
+}
+
+void
+attrstack_free(struct attrstack *as)
+{
+
+	assert(as->cur == 0);
+	free(as->stack);
+	free(as);
+}