DOESN'T COMPILE - Started working on adding message to stack

main.c

@@ -11,6 +11,7 @@
 #include "easysock.h"
 #include "file_helpers.h"
 #include "message_helpers.h"
+#include "stack.h"
 
 #define BUFFER_SIZE 10000
 #define MAX_CONNECTIONS 100
@@ -37,13 +38,18 @@ int main() {
 	int conn_sockets[MAX_CONNECTIONS] = {-1}; 
 	User* to_user[MAX_CONNECTIONS] = {NULL}; 
 	User* from_user[MAX_CONNECTIONS] = {NULL}; 
-	FD_ZERO(&read_fd_set);
+	FD_ZERO(&read_fd_set); char buffer[BUFFER_SIZE]; 
-	char buffer[BUFFER_SIZE];
 	char data[DATA_SIZE]; 
 
 	num_users = num_of_lines("user_file.txt");
 	users = create_user_list("user_file.txt");
 	
+	Stack* message_stack[num_users];
+
+	for (int i=0;i < num_users; i++) {
+		message_stack[i] = new_stack(10);
+	}
+	
 	struct sockaddr addr_struct;
 	int server_sock = create_local(4,'T',"127.0.0.1",30000,&addr_struct);
 	conn_sockets[0] = server_sock;
@@ -107,13 +113,18 @@ int main() {
 						}
 					}
 
-					char* message = fetch_message_string(data);
+					char* message_string = fetch_message_string(data);
-					if (message == NULL) {
+					if (message_string == NULL) {
 						printf("Invalid message.\n");
 						return -10;
 					}	
 
-					printf("Your message is: %s\n",message);
+					printf("Your message is: %s\n",message_string);
+					Message message = new_message(message_string,from_user[i],to_user[i]);
+
+					stack_push( message_stack[user_to_index(to_user[i])],message );
+
+					
 
 					close(conn_sockets[i]);					
 
@@ -192,3 +203,24 @@ User* fetch_user(char* username) {
 
 	return NULL;
 }
+
+int user_to_index(User* user) {
+	int index = 0;
+	for (int i=0;i < num_users; i++) {
+		if (user_equals(users[i],user) == true) {
+			index = i;
+			break;
+		}
+	}
+
+	return index;
+
+}
+
+bool user_equals(User* this, User* other) {
+	if (( strcmp(this->username,other->username) == 0 ) && ( strcmp(this->password,other->password) == 0 )) {
+		return true;
+	} else {
+		return false;
+	}
+}

stack.c

@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <stdbool.h>
+
+#include "stack.h"
+
+struct Stack {
+	void** data;
+	int top_index;
+	int capacity;
+	int curr_size;
+};
+
+Stack* new_stack(int stack_size) {
+	assert(stack_size > 0);
+	Stack* my_stack = malloc(sizeof(Stack));
+	my_stack->capacity = stack_size;
+	my_stack->data = malloc(stack_size);
+	my_stack->top_index = 0;
+	my_stack->curr_size = 0;
+	return my_stack;
+}
+
+void stack_push(Stack* stack,void* element) {
+	if (stack->curr_size >= stack->capacity-1) {
+		stack->data = realloc(stack->data, stack->capacity*2);
+		stack->capacity *= 2;
+	}
+	*(stack->data + stack->top_index) = element;
+	stack->top_index++;
+	stack->curr_size++;
+	return;
+}
+
+void* stack_pop(Stack* stack) {
+	assert( !(stack_isEmpty(stack)) );
+	free(stack->data + stack->top_index);
+	stack->top_index--;
+	void* to_return = *(stack->data + stack->top_index);
+	*(stack->data + stack->top_index) = NULL;
+
+	stack->curr_size--;
+
+	return to_return;
+}
+
+void* stack_peek(Stack* stack) {
+	void* to_return = *(stack->data + stack->top_index - 1);
+	return to_return;
+}
+
+int stack_size(Stack* stack) {
+	return (stack->curr_size);
+}
+
+bool stack_isEmpty(Stack* stack) {
+	if (stack_size(stack) == 0) {
+		return true;
+	}
+	return false;
+}

stack.h

@@ -0,0 +1,11 @@
+#include <stdbool.h>
+
+typedef struct Stack Stack;
+
+Stack* new_stack(int stack_size);
+
+void stack_push(Stack* stack, void* element);
+void* stack_pop(Stack* stack);
+void* stack_peek(Stack* stack);
+int stack_size(Stack* stack);
+bool stack_isEmpty(Stack* stack);