Streaming abbreviation.

git-svn-id: http://svn.drobilla.net/serd/trunk@41 490d8e77-9747-427b-9fa3-0b8f29cee8a0

1 files changed, 79 insertions, 0 deletions

diff --git a/src/serd_stack.h b/src/serd_stack.h
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+/* Serd, an RDF serialisation library.
+ * Copyright 2011 David Robillard <d@drobilla.net>
+ *
+ * Serd is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Serd 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 Lesser General Public
+ * License for details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SERD_STACK_H
+#define SERD_STACK_H
+
+#include <assert.h>
+
+#include "serd/serd.h"
+
+/** An offset to start the stack at.  Note 0 is reserved for NULL. */
+#define SERD_STACK_BOTTOM sizeof(void*)
+
+typedef struct {
+	uint8_t* buf;       ///< Stack memory
+	size_t   buf_size;  ///< Allocated size of buf (>= size)
+	size_t   size;      ///< Conceptual size of stack in buf
+} SerdStack;
+
+static inline SerdStack
+serd_stack_new(size_t size)
+{
+	SerdStack stack;
+	stack.buf       = malloc(size);
+	stack.buf_size  = size;
+	stack.size      = SERD_STACK_BOTTOM;
+	return stack;
+}
+
+static inline bool
+serd_stack_is_empty(SerdStack* stack)
+{
+	return stack->size <= SERD_STACK_BOTTOM;
+}
+
+static inline void
+serd_stack_free(SerdStack* stack)
+{
+	free(stack->buf);
+	stack->buf      = NULL;
+	stack->buf_size = 0;
+	stack->size     = 0;
+}
+
+static inline uint8_t*
+serd_stack_push(SerdStack* stack, size_t n_bytes)
+{
+	const size_t new_size = stack->size + n_bytes;
+	if (stack->buf_size < new_size) {
+		stack->buf_size *= 2;
+		stack->buf = realloc(stack->buf, stack->buf_size);
+	}
+	uint8_t* const ret = (stack->buf + stack->size);
+	stack->size = new_size;
+	return ret;
+}
+
+static inline void
+serd_stack_pop(SerdStack* stack, size_t n_bytes)
+{
+	assert(stack->size >= n_bytes);
+	stack->size -= n_bytes;
+}
+
+#endif // SERD_STACK_H