use stack_empty in stack-related functions

1 files changed, 6 insertions, 6 deletions

diff --git a/xml2tsv.c b/xml2tsv.c
index 635ae37..960c2de 100644
--- a/xml2tsv.c
+++ b/xml2tsv.c
@@ -26,6 +26,10 @@ typedef struct {
 	char st[DEPTH_MAX][STR_MAX];
 } tstack_t;
 
+int stack_empty(tstack_t *t){
+	return (t->top < 0);
+}
+
 int stack_push(tstack_t *t, const char *c){
 	if (t->top < DEPTH_MAX){
 		t->top ++;
@@ -37,21 +41,17 @@ int stack_push(tstack_t *t, const char *c){
 }
 
 char* stack_pop(tstack_t *t){
-	if (t->top >= 0)
+	if (!stack_empty(t))
 		return t->st[t->top--];
 	return NULL;
 }
 
 char* stack_peek(tstack_t *t){
-	if (t->top >= 0)
+	if (!stack_empty(t))
 		return t->st[t->top];
 	return NULL;
 }
 
-int stack_empty(tstack_t *t){
-	return (t->top < 0);
-}
-
 void stack_init(tstack_t *t){
 	t->top = -1;
 }