Implement I/O abstraction layer. Finally.

lib/zip_file_set_comment.c

diff --git a/lib/zip_file_set_comment.c b/lib/zip_file_set_comment.c
index 6947818..cdc3a35 100644
--- a/lib/zip_file_set_comment.c
+++ b/lib/zip_file_set_comment.c
@@ -1,6 +1,6 @@
 /*
   zip_file_set_comment.c -- set comment for file in archive
-  Copyright (C) 2006-2012 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>
@@ -49,12 +49,12 @@
 	return -1;
 
     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;
     }
 
@@ -83,7 +83,7 @@
     if (changed) {
         if (e->changes == NULL) {
             if ((e->changes=_zip_dirent_clone(e->orig)) == NULL) {
-                _zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
+                zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
 		_zip_string_free(cstr);
                 return -1;
             }