colm-0.12.0HEADcolm-0.12.0master

1 files changed, 55 insertions, 0 deletions

diff --git a/src/buffer.h b/src/buffer.h
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+/*
+ *  Copyright 2003 Adrian Thurston <thurston@complang.org>
+ */
+
+/*  This file is part of Colm.
+ *
+ *  Colm 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.
+ * 
+ *  Colm 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 Colm; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+
+#ifndef _BUFFER_H
+#define _BUFFER_H
+
+#define BUFFER_INITIAL_SIZE 4096
+
+/* An automatically grown buffer for collecting tokens. Always reuses space;
+ * never down resizes. */
+struct Buffer
+{
+	Buffer()
+	{
+		data = (char*) malloc( BUFFER_INITIAL_SIZE );
+		allocated = BUFFER_INITIAL_SIZE;
+		length = 0;
+	}
+	~Buffer() { free(data); }
+
+	void append( char p )
+	{
+		if ( length == allocated ) {
+			allocated *= 2;
+			data = (char*) realloc( data, allocated );
+		}
+		data[length++] = p;
+	}
+		
+	void clear() { length = 0; }
+
+	char *data;
+	int allocated;
+	int length;
+};
+
+#endif /* _BUFFER_H */