Version 2.3a.

[bison.git] / data / c.m4

diff --git a/data/c.m4 b/data/c.m4
index 2ef88b159b3dcf05dd1666a468e85bd33e1732e3..ffb04c202fa2bc87136615ad603a733285c86c5e 100644 (file)
--- a/data/c.m4
+++ b/data/c.m4
@@ -81,7 +81,6 @@ m4_define([b4_identification],
 ])
 
 
-
 ## ---------------- ##
 ## Default values.  ##
 ## ---------------- ##
@@ -100,7 +99,6 @@ m4_define_default([b4_location_initial_line],   [1])
 ## Pure/impure interfaces.  ##
 ## ------------------------ ##
 
-
 # b4_user_args
 # ------------
 m4_define([b4_user_args],
@@ -137,11 +135,11 @@ m4_define([b4_parse_param_use],
 ])dnl
 ])
 
+
 ## ------------ ##
 ## Data Types.  ##
 ## ------------ ##
 
-
 # b4_ints_in(INT1, INT2, LOW, HIGH)
 # ---------------------------------
 # Return 1 iff both INT1 and INT2 are in [LOW, HIGH], 0 otherwise.
@@ -173,6 +171,17 @@ m4_define([b4_int_type_for],
 [b4_int_type($1_min, $1_max)])
 
 
+## ---------##
+## Values.  ##
+## ---------##
+
+# b4_null
+---------
+# Return a null pointer constant.  NULL infringes on the user name
+# space in C, so use 0 rather than NULL.
+m4_define([b4_null], [0])
+
+
 ## ------------------ ##
 ## Decoding options.  ##
 ## ------------------ ##
@@ -458,6 +467,13 @@ b4_define_user_code([stype])
 ## User actions.  ##
 ## -------------- ##
 
+# b4_case(LABEL, STATEMENTS)
+# --------------------------
+m4_define([b4_case],
+[  case $1:
+$2
+    break;])
+
 # b4_symbol_actions(FILENAME, LINENO,
 #                   SYMBOL-TAG, SYMBOL-NUM,
 #                   SYMBOL-ACTION, SYMBOL-TYPENAME)