moving strbuf to buffer

buffer.c

@@ -0,0 +1,81 @@
+/* buffer.c
+ *
+ *   Copyright (C) 2010-2011   Henrik Hautakoski <henrik@fiktivkod.org>
+ *
+ *   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, write to the Free Software
+ *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ *   MA 02110-1301, USA.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "error.h"
+#include "buffer.h"
+
+#define CHNK_SIZE 128
+
+unsigned char buffer_null = '\0';
+
+void buffer_init(struct buffer *b) {
+
+	b->block = &buffer_null;
+	b->size = b->len = 0;
+}
+
+void buffer_expand(struct buffer *b, size_t len) {
+
+	if (b->len + len < b->size)
+		return;
+	if (!b->size)
+		b->block = NULL;
+
+	do
+		b->size += CHNK_SIZE;
+	while(b->len + len > b->size);
+
+	b->block = realloc(b->block, b->size);
+}
+
+char* buffer_cstr(struct buffer *b) {
+
+	buffer_expand(b, 1);
+	b->block[b->len + 1] = '\0';
+
+	return (char*) b->block;
+}
+
+void buffer_free(struct buffer *b) {
+
+	if (!b->size)
+		return;
+
+	free(b->block);
+	buffer_init(b);
+}
+
+void buffer_attach(struct buffer *b, void *ptr, size_t len, size_t size) {
+
+	buffer_free(b);
+	b->block = ptr;
+	b->len = len;
+	b->size = size;
+	buffer_expand(b, 0);
+}
+
+void buffer_append(struct buffer *b, const void *ptr, size_t len) {
+
+	buffer_expand(b, len);
+	memcpy(b->block + b->len, ptr, len);
+	buffer_setlen(b, b->len + len);
+}