Implement string concatenate and repeat operatorsexpressions

This patch exercises the new expression infrastructure to implement syntax
to concatenate and repeat strings.  We use syntax inspired by Python,
with '+' overloaded for string concatenation and '*' overloaded for string
repeat.  Normally we'd use C syntax to inspire dts syntax, but C has no
obvious candidates for these string operators.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 4 insertions, 0 deletions

diff --git a/dtc.h b/dtc.h
index d270626..d3f8ad0 100644
--- a/dtc.h
+++ b/dtc.h
@@ -302,6 +302,10 @@ DEF_BINARY_OP(logic_and);
 
 DEF_BINARY_OP(logic_or);
 
+struct expression *expression_concat(struct srcpos *pos,
+				     struct expression *arg0,
+				     struct expression *arg1);
+
 struct expression *expression_conditional(struct srcpos *pos,
 					  struct expression *,
 					  struct expression *,