10 files changed, 255 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..51d9359
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+obj/
+lib/
+GPATH
+GRTAGS
+GTAGS
+.dir-locals.el
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..67ded2b
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,25 @@
+CFLAGS := -Iinc -g -Og -Wall
+
+# Lähtekood
+SRC := $(wildcard src/*.c)
+OBJ := $(patsubst src/%.c, obj/%.o, $(SRC))
+
+all: lib/interpret
+
+lib/interpret: $(OBJ) | lib
+	gcc $(CFLAGS) $(OBJ) -o lib/interpret
+
+obj/%.o: src/%.c | obj
+	gcc -c $(CFLAGS) -o $@ $<
+
+# Dirs
+lib:
+	mkdir lib
+
+obj:
+	mkdir obj
+
+.PHONY: clean
+clean:
+	rm -r obj lib
+
diff --git a/inc/bfi.h b/inc/bfi.h
new file mode 100644
index 0000000..7f3dbce
--- /dev/null
+++ b/inc/bfi.h
@@ -0,0 +1,17 @@
+#ifndef __BFI_H__
+#define __BFI_H__
+
+enum instructions_e{
+    BF_RIGHT      = '>',
+    BF_LEFT       = '<',
+    BF_INCREASE   = '+',
+    BF_DECREASE   = '-',
+    BF_READ       = ',',
+    BF_PRINT      = '.',
+    BF_START_LOOP = '[',
+    BF_END_LOOP   = ']',
+    BF_DEBUG      = '#'};
+
+void intepret(char *program);
+
+#endif
diff --git a/inc/mem.h b/inc/mem.h
new file mode 100644
index 0000000..50a0a17
--- /dev/null
+++ b/inc/mem.h
@@ -0,0 +1,19 @@
+#ifndef __MEM_H__
+#define __MEM_H__
+
+#define MEM_SIZE 30000
+
+struct mem_st {
+    char arr[MEM_SIZE];
+    int pos;
+};
+
+int mem_inc();
+int mem_dec();
+int mem_left();
+int mem_right();
+int mem_get();
+int mem_set(char v);
+void mem_printDebug();
+
+#endif
diff --git a/inc/stack.h b/inc/stack.h
new file mode 100644
index 0000000..60d41b8
--- /dev/null
+++ b/inc/stack.h
@@ -0,0 +1,10 @@
+#ifndef __STACK_H__
+#define __STACK_H__
+
+void stackPush(int val);
+int stackPop(void);
+int stackIsEmpty(void);
+int stackPeek(void);
+void stackPrint(void);
+
+#endif
diff --git a/notes.txt b/notes.txt
new file mode 100644
index 0000000..02f9c0b
--- /dev/null
+++ b/notes.txt
@@ -0,0 +1,6 @@
+What are exactly object files?
+#ifdef ja #ifndef check over
+what are enums
+https://www.gnu.org/software/make/manual/html_node/Syntax-of-Functions.html#Syntax-of-Functions
+.PHONY?
+
diff --git a/src/bfi.c b/src/bfi.c
new file mode 100644
index 0000000..0171ede
--- /dev/null
+++ b/src/bfi.c
@@ -0,0 +1,6 @@
+#include "bfi.h"
+
+void intepret(char *program){
+    
+}
+
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..ec1de31
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include "stack.h"
+
+int main() {
+	int x, y, z;
+
+	while (1) {
+		scanf("%d", &x);
+
+		// 1. Kui x==0 siis print stack.
+		if (x == 0){
+			printf("\nPrindin stacki\n");
+			stackPrint();
+			break;
+		}
+
+		// 2. Kui empty Push.
+		else if (stackIsEmpty())
+			stackPush(x);
+
+		// 3. Kui x pos. ja peeked pos: push(x).
+		// 4. kui x pos. aga peeked neg., y=pop() ja push(x+y).
+		else if (x >= 0){
+			y = stackPeek();
+			if (y >= 0)
+				stackPush(x);
+
+			else{
+				z = stackPop();
+				if (x+z != 0)
+					stackPush(x+z);
+			}
+		}
+
+		// 5. Kui x on neg, siis pop()
+		else if (x < 0) {
+			z = stackPop();
+			if (x+z != 0) {
+				stackPush(x+z);
+			}
+		}
+
+	} // While loop End
+	return 0;
+}
diff --git a/src/mem.c b/src/mem.c
new file mode 100644
index 0000000..3c605a5
--- /dev/null
+++ b/src/mem.c
@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include "mem.h"
+
+struct mem_st mem = { .pos = 0};
+
+int mem_inc(){
+    mem.arr[mem.pos]++;
+	return mem.arr[mem.pos];
+}
+
+int mem_dec(){
+    mem.arr[mem.pos]--;
+	return mem.arr[mem.pos];
+}
+
+int mem_left(){
+   if (mem.pos <= 0) {
+       mem.pos = MEM_SIZE-1;
+   } 
+   else {
+       mem.pos--;
+   }
+   return mem.pos;
+}
+
+int mem_right(){
+   if (mem.pos >= MEM_SIZE-1) {
+       mem.pos = 0;
+   } 
+   else {
+       mem.pos++;
+   }
+   return mem.pos;
+
+}
+
+int mem_get(){
+    return mem.arr[mem.pos];
+}
+
+int mem_set(char v){
+    mem.arr[mem.pos] = v;
+    return v;
+}
+
+void mem_printDebug(){
+    if (mem.pos+9 >= MEM_SIZE)
+        printf("index: %d [%d .. %d]: ", mem.pos, mem.pos, mem.pos-MEM_SIZE+9);
+    printf("index: %d [%d .. %d]: ", mem.pos, mem.pos, mem.pos+9);
+
+    for (int i = 0; i < 10; ++i) {
+        if (mem.pos+i >= MEM_SIZE) {
+            printf("%d ", mem.arr[mem.pos-MEM_SIZE+i]); 
+        }
+        else {
+            printf("%d ", mem.arr[mem.pos+i]);
+        }
+    }
+
+}
diff --git a/src/stack.c b/src/stack.c
new file mode 100644
index 0000000..2fe3488
--- /dev/null
+++ b/src/stack.c
@@ -0,0 +1,61 @@
+#include "stack.h"
+#include <stdio.h>
+
+#define STACK_SIZE 100
+
+struct stack_st {
+    int len;
+    int arr[STACK_SIZE];
+};
+
+struct stack_st stack = { .len = 0, .arr = {0}};
+
+// Functions
+
+void stackPush(int val){
+  if (stack.len >= STACK_SIZE){
+	printf("Stack overrflow\n");
+	return;
+  }
+  stack.arr[stack.len] = val;
+  stack.len++;
+  return;
+}
+
+
+int stackPop(void){
+  if (stackIsEmpty()){
+	return 0;
+  }
+  int stackPopped = stack.arr[--stack.len];
+  return stackPopped;
+}
+
+
+int stackIsEmpty(void) {
+    return !(stack.len > 0);
+}
+
+
+int stackPeek(){
+	// To avoid funking up the stack.len
+	if (stackIsEmpty()) return 0;
+	else if (stack.len == 1) return stack.arr[1];
+	else{
+		int x = stackPop();
+		stackPush(x);
+		return x;
+	}
+}
+
+
+void stackPrint(){
+	while(1){
+		if(stackIsEmpty())
+			break;
+
+		int x = stackPop();
+		printf("%d\n", x);
+	}
+	return;
+}