did some electronics and comp sci work

1 files changed, 42 insertions, 0 deletions

diff --git a/comp/work/37/stack.c b/comp/work/37/stack.c
new file mode 100644
index 0000000..3c1ab19
--- /dev/null
+++ b/comp/work/37/stack.c
@@ -0,0 +1,42 @@
+#include <stddef.h>
+#include <stdlib.h>
+
+typedef struct stack {
+	int *sp;
+	int value;
+	int (*pop)(struct stack *stack);
+	void (*push)(struct stack *stack, int value);
+	void (*free)(struct stack *strack);
+	int *stack;
+} stack;
+
+int pop(stack *stack){
+	stack->sp -= sizeof(int);
+	int i = *stack->sp;
+	*stack->sp = stack->value;
+	return i;
+}
+
+void push(stack *stack, int value){
+	*stack->sp = value;
+	stack->sp += sizeof(int);
+}
+
+void deinitstack(stack *stack){
+	free(stack->stack);
+	free(stack);
+	stack = NULL;
+}
+
+stack *initstack(int value, size_t size){
+	stack *s = malloc(sizeof(stack));
+	s->stack = calloc(0, size*sizeof(int));
+	s->sp = s->stack;
+	s->value = value;
+	s->pop = &pop;
+	s->push = &push;
+	s->free = &deinitstack;
+
+	return s;
+}
+