Initial commit

stack.h

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+//
+// Created by marto on 27. 10. 25.
+//
+
+#ifndef CALCULATOR_STACK_H
+#define CALCULATOR_STACK_H
+
+typedef enum {
+    StringArray,
+    CharArray,
+    IntArray,
+} DataType;
+
+typedef struct {
+    DataType type;
+
+    union {
+        char **sarr;
+        char *carr;
+        int *narr;
+    } data;
+
+    // if i >= len, the program's guardrails have failed
+    int i, len;
+} stack;
+
+typedef union {
+    char ch;
+    char *string;
+    int n;
+} stackInput;
+
+typedef struct {
+    stackInput data;
+    int ret_code;
+} stackData;
+
+stack stack_init(DataType type, int len);
+
+void stack_deinit(stack *stack);
+
+int stack_push(stack *stack, stackInput input, bool pushCharToString);
+
+stackData stack_pop(stack *stack);
+
+stackData stack_get(const stack *stack, int n);
+
+void stack_print(const stack *stack, const char *name);
+
+static void clear_str_array(const stack *stack);
+
+#endif //CALCULATOR_STACK_H