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diff --git a/mixlib/mix_src_file.h b/mixlib/mix_src_file.h
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+/* -*-c-*- ---------------- mix_src_file.h :
+ * Declaration of mix_src_file_t, a type representing a MIXAL source
+ * file.
+ * ------------------------------------------------------------------
+ *  Last change: Time-stamp: <01/02/20 00:23:58 jose>
+ * ------------------------------------------------------------------
+ * Copyright (C) 2000 Free Software Foundation, Inc.
+ *  
+ * 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.
+ *  
+ */
+
+
+#ifndef MIX_SRC_FILE_H
+#define MIX_SRC_FILE_H
+
+#include "mix_file.h"
+
+/* the MIXAL source file type */
+typedef struct mix_src_file_t mix_src_file_t;
+
+/* create a new src file from an existing disk file */
+extern mix_src_file_t *
+mix_src_file_new_for_read (const gchar *path);
+
+/* destroy a src file object */
+extern void
+mix_src_file_delete (mix_src_file_t *src);
+
+/* get the source file path */
+extern const gchar *
+mix_src_file_get_path (const mix_src_file_t *src);
+
+/* get a given line of the source file */
+extern const gchar *
+mix_src_file_get_line (const mix_src_file_t *src, guint lineno);
+
+/* get the total no. of lines in the file */
+extern guint
+mix_src_file_get_line_no (const mix_src_file_t *src);
+
+
+
+#endif /* MIX_SRC_FILE_H */
+