Implement I/O abstraction layer. Finally.
diff --git a/lib/zip_set_archive_comment.c b/lib/zip_set_archive_comment.c
index 7b8b24b..2153138 100644
--- a/lib/zip_set_archive_comment.c
+++ b/lib/zip_set_archive_comment.c
@@ -1,6 +1,6 @@
 /*
   zip_set_archive_comment.c -- set archive comment
-  Copyright (C) 2006-2013 Dieter Baron and Thomas Klausner
+  Copyright (C) 2006-2014 Dieter Baron and Thomas Klausner
 
   This file is part of libzip, a library to manipulate ZIP archives.
   The authors can be contacted at <libzip@nih.at>
@@ -43,12 +43,12 @@
     struct zip_string *cstr;
 
     if (ZIP_IS_RDONLY(za)) {
-	_zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
+	zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
 	return -1;
     }
 
     if (len > 0 && comment == NULL) {
-	_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
+	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
 	return -1;
     }
 
@@ -58,7 +58,7 @@
 
 	if (_zip_guess_encoding(cstr, ZIP_ENCODING_UNKNOWN) == ZIP_ENCODING_CP437) {
 	    _zip_string_free(cstr);
-	    _zip_error_set(&za->error, ZIP_ER_INVAL, 0);
+	    zip_error_set(&za->error, ZIP_ER_INVAL, 0);
 	    return -1;
 	}
     }