1 files changed, 57 insertions, 0 deletions
diff --git a/graphs/piscine/evalexpr/src/stack.c b/graphs/piscine/evalexpr/src/stack.c
new file mode 100644
index 0000000..14f659e
--- /dev/null
+++ b/graphs/piscine/evalexpr/src/stack.c
@@ -0,0 +1,57 @@
+#include "stack.h"
+
+#include <stdlib.h>
+
+struct stack *stack_push(struct stack *s, int e)
+{
+    struct stack *new = malloc(sizeof(struct stack));
+    new->data = e;
+    new->next = NULL;
+
+    new->next = s;
+    return new;
+}
+
+struct stack *stack_pop(struct stack *s)
+{
+    if (s == NULL)
+    {
+        return NULL;
+    }
+
+    struct stack *res = s->next;
+    free(s);
+    return res;
+}
+
+int stack_peek(struct stack *s)
+{
+    return s->data;
+}
+
+struct tstack *tstack_push(struct tstack *s, struct token *e)
+{
+    struct tstack *new = malloc(sizeof(struct tstack));
+    new->token = e;
+    new->next = NULL;
+
+    new->next = s;
+    return new;
+}
+
+struct tstack *tstack_pop(struct tstack *s)
+{
+    if (s == NULL)
+    {
+        return NULL;
+    }
+
+    struct tstack *res = s->next;
+    free(s);
+    return res;
+}
+
+struct token *tstack_peek(struct tstack *s)
+{
+    return s->token;
+}