Allow output files to overwrite input files (bug #21280). Thanks to

[pspp-builds.git] / src / language / data-io / file-handle.q

diff --git a/src/language/data-io/file-handle.q b/src/language/data-io/file-handle.q
index 71cc961f7227d4e1646a59d098fff9c4a87162d0..d53017735259eeec6b6cb2635fa4dd5734e9f17e 100644 (file)
--- a/src/language/data-io/file-handle.q
+++ b/src/language/data-io/file-handle.q
@@ -133,8 +133,7 @@ cmd_close_file_handle (struct lexer *lexer, struct dataset *ds UNUSED)
   if (handle == NULL)
     return CMD_CASCADING_FAILURE;
 
-  fh_free (handle);
-
+  fh_unname (handle);
   return CMD_SUCCESS;
 }
 
@@ -158,7 +157,10 @@ referent_name (enum fh_referent referent)
 /* Parses a file handle name, which may be a file name as a string
    or a file handle name as an identifier.  The allowed types of
    file handle are restricted to those in REFERENT_MASK.  Returns
-   the file handle when successful, a null pointer on failure. */
+   the file handle when successful, a null pointer on failure.
+
+   The caller is responsible for fh_unref()'ing the returned
+   file handle when it is no longer needed. */
 struct file_handle *
 fh_parse (struct lexer *lexer, enum fh_referent referent_mask)
 {
@@ -177,8 +179,6 @@ fh_parse (struct lexer *lexer, enum fh_referent referent_mask)
       handle = NULL;
       if (lex_token (lexer) == T_ID)
         handle = fh_from_id (lex_tokid (lexer));
-      if (handle == NULL)
-        handle = fh_from_file_name (ds_cstr (lex_tokstr (lexer)));
       if (handle == NULL)
         {
           if (lex_token (lexer) != T_ID || lex_tokid (lexer)[0] != '#' || get_syntax () != ENHANCED)
@@ -194,6 +194,7 @@ fh_parse (struct lexer *lexer, enum fh_referent referent_mask)
     {
       msg (SE, _("Handle for %s not allowed here."),
            referent_name (fh_get_referent (handle)));
+      fh_unref (handle);
       return NULL;
     }