X-Git-Url: https://git.danieliu.xyz/?a=blobdiff_plain;f=cstack.c;h=5331328f25158aac6a362044133bf8fedb7e3292;hb=b416f18295f7edcb5474396a6b26a59fd5ddb1f5;hp=647443613f6c5b87475a34cb226685046f53eb9b;hpb=0f870f29388a36d32ec9ffaabe9ffe03edc038c0;p=smdp.git

diff --git a/cstack.c b/cstack.c
index 6474436..5331328 100644
--- a/cstack.c
+++ b/cstack.c
@@ -29,8 +29,10 @@ char cstack_pop(cstack_t *self) {
     return self->content[self->head--];
 }
 
-char cstack_top(cstack_t *self) {
-    return self->content[self->head];
+int cstack_top(cstack_t *self, char c) {
+    if(self->head >= 0 && self->content[self->head] == c)
+        return 1;
+    return 0;
 }
 
 int cstack_empty(cstack_t *self)  {