1 files changed, 181 insertions, 0 deletions
diff --git a/buffer.c b/buffer.c
new file mode 100644
index 00000000..3166088c
--- /dev/null
+++ b/buffer.c
@@ -0,0 +1,181 @@
+/* $Id: buffer.c,v 1.1.1.1 2007-07-09 19:03:33 nicm Exp $ */
+
+/*
+ * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+
+#include <string.h>
+
+#include "tmux.h"
+
+/* Create a buffer. */
+struct buffer *
+buffer_create(size_t size)
+{
+	struct buffer	*b;
+
+	if (size == 0)
+		log_fatalx("buffer_create: zero size");
+
+	b = xcalloc(1, sizeof *b);
+
+	b->base = xmalloc(size);
+	b->space = size;
+
+	return (b);
+}
+
+/* Destroy a buffer. */
+void
+buffer_destroy(struct buffer *b)
+{
+	xfree(b->base);
+	xfree(b);
+}
+
+/* Empty a buffer. */
+void
+buffer_clear(struct buffer *b)
+{
+	b->size = 0;
+	b->off = 0;
+}
+
+/* Ensure free space for size in buffer. */
+void
+buffer_ensure(struct buffer *b, size_t size)
+{
+	if (size == 0)
+		log_fatalx("buffer_ensure: zero size");
+
+	if (BUFFER_FREE(b) >= size)
+		return;
+
+	if (b->off > 0) {
+		if (b->size > 0)
+			memmove(b->base, b->base + b->off, b->size);
+		b->off = 0;
+	}
+
+	ENSURE_FOR(b->base, b->space, b->size, size);
+}
+
+/* Adjust buffer after data appended. */
+void
+buffer_add(struct buffer *b, size_t size)
+{
+	if (size == 0)
+		log_fatalx("buffer_add: zero size");
+	if (size > b->space - b->size)
+		log_fatalx("buffer_add: overflow");
+
+	b->size += size;
+}
+
+/* Reverse buffer add. */
+void
+buffer_reverse_add(struct buffer *b, size_t size)
+{
+	if (size == 0)
+		log_fatalx("buffer_reverse_add: zero size");
+	if (size > b->size)
+		log_fatalx("buffer_reverse_add: underflow");
+
+	b->size -= size;
+}
+
+/* Adjust buffer after data removed. */
+void
+buffer_remove(struct buffer *b, size_t size)
+{
+	if (size == 0)
+		log_fatalx("buffer_remove: zero size");
+	if (size > b->size)
+		log_fatalx("buffer_remove: underflow");
+
+	b->size -= size;
+	b->off += size;
+}
+
+/* Reverse buffer remove. */
+void
+buffer_reverse_remove(struct buffer *b, size_t size)
+{
+	if (size == 0)
+		log_fatalx("buffer_reverse_remove: zero size");
+	if (size > b->off)
+		log_fatalx("buffer_reverse_remove: overflow");
+
+	b->size += size;
+	b->off -= size;
+}
+
+/* Insert a section into the buffer. */
+void
+buffer_insert_range(struct buffer *b, size_t base, size_t size)
+{
+	if (size == 0)
+		log_fatalx("buffer_insert_range: zero size");
+	if (base > b->size)
+		log_fatalx("buffer_insert_range: range overflows buffer");
+
+	buffer_ensure(b, size);
+	memmove(b->base + b->off + base + size,
+	    b->base + b->off + base, b->size - base);
+	b->size += size;
+}
+
+/* Delete a section from the buffer. */
+void
+buffer_delete_range(struct buffer *b, size_t base, size_t size)
+{
+	if (size == 0)
+		log_fatalx("buffer_delete_range: zero size");
+	if (size > b->size)
+		log_fatalx("buffer_delete_range: size too big");
+	if (base + size > b->size)
+		log_fatalx("buffer_delete_range: range overflows buffer");
+
+	memmove(b->base + b->off + base,
+	    b->base + b->off + base + size, b->size - base - size);
+	b->size -= size;
+}
+
+/* Copy data into a buffer. */
+void
+buffer_write(struct buffer *b, const void *data, size_t size)
+{
+	if (size == 0)
+		log_fatalx("buffer_write: zero size");
+
+	buffer_ensure(b, size);
+	memcpy(BUFFER_IN(b), data, size);
+	buffer_add(b, size);
+}
+
+/* Copy data out of a buffer. */
+void
+buffer_read(struct buffer *b, void *data, size_t size)
+{
+	if (size == 0)
+		log_fatalx("buffer_read: zero size");
+	if (size > b->size)
+		log_fatalx("buffer_read: underflow");
+
+	memcpy(data, BUFFER_OUT(b), size);
+	buffer_remove(b, size);
+}