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-rw-r--r--src/vppinfra/macros.c15
-rw-r--r--src/vppinfra/macros.h3
2 files changed, 14 insertions, 4 deletions
diff --git a/src/vppinfra/macros.c b/src/vppinfra/macros.c
index bc6df55b39d..240cef02e0e 100644
--- a/src/vppinfra/macros.c
+++ b/src/vppinfra/macros.c
@@ -92,12 +92,20 @@ clib_macro_get_value (clib_macro_main_t * mm, char *name)
* looks up $foobar in the variable table.
*/
i8 *
-clib_macro_eval (clib_macro_main_t * mm, i8 * s, i32 complain)
+clib_macro_eval (clib_macro_main_t * mm, i8 * s, i32 complain, u16 level,
+ u16 max_level)
{
i8 *rv = 0;
i8 *varname, *varvalue;
i8 *ts;
+ if (level >= max_level)
+ {
+ if (complain)
+ clib_warning ("circular definition, level %d", level);
+ return (i8 *) format (0, " CIRCULAR ");
+ }
+
while (*s)
{
switch (*s)
@@ -161,7 +169,8 @@ clib_macro_eval (clib_macro_main_t * mm, i8 * s, i32 complain)
if (varvalue)
{
/* recursively evaluate */
- ts = clib_macro_eval (mm, varvalue, complain);
+ ts = clib_macro_eval (mm, varvalue, complain, level + 1,
+ max_level);
vec_free (varvalue);
/* add results to answer */
vec_append (rv, ts);
@@ -195,7 +204,7 @@ clib_macro_eval_dollar (clib_macro_main_t * mm, i8 * s, i32 complain)
i8 *rv;
s2 = (i8 *) format (0, "$(%s)%c", s, 0);
- rv = clib_macro_eval (mm, s2, complain);
+ rv = clib_macro_eval (mm, s2, complain, 0 /* level */ , 8 /* max_level */ );
vec_free (s2);
return (rv);
}
diff --git a/src/vppinfra/macros.h b/src/vppinfra/macros.h
index 54ceda7016b..1b2064add34 100644
--- a/src/vppinfra/macros.h
+++ b/src/vppinfra/macros.h
@@ -39,7 +39,8 @@ int clib_macro_set_value (clib_macro_main_t * mm, char *name, char *value);
void clib_macro_add_builtin (clib_macro_main_t * mm, char *name,
void *eval_fn);
i8 *clib_macro_get_value (clib_macro_main_t * mm, char *name);
-i8 *clib_macro_eval (clib_macro_main_t * mm, i8 * s, i32 complain);
+i8 *clib_macro_eval (clib_macro_main_t * mm, i8 * s, i32 complain,
+ u16 level, u16 max_level);
i8 *clib_macro_eval_dollar (clib_macro_main_t * mm, i8 * s, i32 complain);
void clib_macro_init (clib_macro_main_t * mm);
void clib_macro_free (clib_macro_main_t * mm);