Implement non-clobbering file io. Use the >? operator for this for now.

darcs-hash:20071026184232-75c98-11edcbc7548c8ad3a2d4b648cb7ae18067569f02.gz

1 files changed, 6 insertions, 0 deletions

diff --git a/tokenizer.c b/tokenizer.c
index 0551bb17..edefc070 100644
--- a/tokenizer.c
+++ b/tokenizer.c
@@ -69,6 +69,7 @@ static const wchar_t *tok_desc[] =
 	N_( L"Append output to file" ),
 	N_( L"Redirect input to file" ),
 	N_( L"Redirect to file descriptor" ),
+	N_( L"Redirect output to file if file does not exist" ),
 	N_( L"Run job in background" ),
 	N_( L"Comment" )
 }
@@ -473,6 +474,11 @@ static void read_redirect( tokenizer *tok, int fd )
 		tok->buff++;
 		tok->last_type = TOK_REDIRECT_FD;
 	}
+	else if( *tok->buff == L'?' )
+	{
+		tok->buff++;
+		tok->last_type = TOK_REDIRECT_NOCLOB;
+	}
 	else
 	{
 		tok->last_type = TOK_REDIRECT_OUT + mode;