From 5a02853da5c454ff34e65ddaea5e677a3285bc79 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Sun, 3 May 2020 22:13:02 +0200
Subject: Added list and tree data types for better vfs

---
 src/kernel/lib/data/list.c | 225 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 225 insertions(+)
 create mode 100644 src/kernel/lib/data/list.c

(limited to 'src/kernel/lib/data/list.c')

diff --git a/src/kernel/lib/data/list.c b/src/kernel/lib/data/list.c
new file mode 100644
index 0000000..3346e32
--- /dev/null
+++ b/src/kernel/lib/data/list.c
@@ -0,0 +1,225 @@
+#include <stdint.h>
+#include <stddef.h>
+#include <kernel/lib/lib.h>
+#include <kernel/lib/stdlib.h>
+#include <kernel/lib/data.h>
+#include <kernel/memory/alloc.h>
+
+struct list *list_create()
+{
+	struct list *list = kcalloc(sizeof(struct list), 1);
+	return list;
+}
+
+uint32_t list_size(struct list *list)
+{
+	if (!list)
+		return 0;
+	return list->size;
+}
+
+void *list_remove_node(struct list *list, struct list_node *node)
+{
+	void *val = node->val;
+	if (list->head == node)
+		return list_remove_front(list);
+	else if (list->tail == node)
+		return list_remove_back(list);
+	else {
+		node->next->prev = node->prev;
+		node->prev->next = node->next;
+		list->size--;
+		kfree(node);
+	}
+	return val;
+}
+struct list_node *list_insert_front(struct list *list, void *val)
+{
+	struct list_node *t = kcalloc(sizeof(struct list_node), 1);
+	list->head->prev = t;
+	t->next = list->head;
+	t->val = val;
+
+	if (!list->head)
+		list->tail = t;
+
+	list->head = t;
+	list->size++;
+	return t;
+}
+
+void list_insert_back(struct list *list, void *val)
+{
+	struct list_node *t = kcalloc(sizeof(struct list_node), 1);
+	t->prev = list->tail;
+	if (list->tail)
+		list->tail->next = t;
+	t->val = val;
+
+	if (!list->head)
+		list->head = t;
+
+	list->tail = t;
+	list->size++;
+}
+
+void *list_remove_front(struct list *list)
+{
+	if (!list->head)
+		return NULL;
+	struct list_node *t = list->head;
+	void *val = t->val;
+	list->head = t->next;
+	if (list->head)
+		list->head->prev = NULL;
+	kfree(t);
+	list->size--;
+	return val;
+}
+
+void *list_remove_back(struct list *list)
+{
+	if (!list->head)
+		return NULL;
+	struct list_node *t = list->tail;
+	void *val = t->val;
+	list->tail = t->prev;
+	if (list->tail)
+		list->tail->next = NULL;
+	kfree(t);
+	list->size--;
+	return val;
+}
+
+void list_push(struct list *list, void *val)
+{
+	list_insert_back(list, val);
+}
+
+struct list_node *list_pop(struct list *list)
+{
+	if (!list->head)
+		return NULL;
+	struct list_node *t = list->tail;
+	list->tail = t->prev;
+	if (list->tail)
+		list->tail->next = NULL;
+	list->size--;
+	return t;
+}
+
+void list_enqueue(struct list *list, void *val)
+{
+	list_insert_front(list, val);
+}
+
+struct list_node *list_dequeue(struct list *list)
+{
+	return list_pop(list);
+}
+
+void *list_peek_front(struct list *list)
+{
+	if (!list->head)
+		return NULL;
+	return list->head->val;
+}
+
+void *list_peek_back(struct list *list)
+{
+	if (!list->tail)
+		return NULL;
+	return list->tail->val;
+}
+
+
+int list_contain(struct list *list, void *val)
+{
+	int idx = 0;
+	foreach(listnode, list)
+	{
+		if (listnode->val == val)
+			return idx;
+		idx++;
+	}
+	return -1;
+}
+
+struct list_node *list_get_node_by_index(struct list *list, int index)
+{
+	if (index < 0 || index >= list_size(list))
+		return NULL;
+	int curr = 0;
+	foreach(listnode, list)
+	{
+		if (index == curr)
+			return listnode;
+		curr++;
+	}
+	return NULL;
+}
+
+void *list_remove_by_index(struct list *list, int index)
+{
+	struct list_node *node = list_get_node_by_index(list, index);
+	return list_remove_node(list, node);
+}
+
+void list_destroy(struct list *list)
+{
+	struct list_node *node = list->head;
+	while (node != NULL) {
+		struct list_node *save = node;
+		node = node->next;
+		kfree(save);
+	}
+	kfree(list);
+}
+
+void listnode_destroy(struct list_node *node)
+{
+	kfree(node);
+}
+
+// Conversion
+
+struct list *str_split(const char *str, const char *delim, uint32_t *numtokens)
+{
+	struct list *ret_list = list_create();
+	char *s = strdup(str);
+	char *token, *rest = s;
+	while ((token = strsep(&rest, delim)) != NULL) {
+		if (!strcmp(token, "."))
+			continue;
+		if (!strcmp(token, "..")) {
+			if (list_size(ret_list) > 0)
+				list_pop(ret_list);
+			continue;
+		}
+		list_push(ret_list, strdup(token));
+		if (numtokens)
+			(*numtokens)++;
+	}
+	kfree(s);
+	return ret_list;
+}
+
+char *list_to_str(struct list *list, const char *delim)
+{
+	char *ret = kmalloc(256);
+	memset(ret, 0, 256);
+	int len = 0, ret_len = 256;
+	while (list_size(list) > 0) {
+		char *temp = list_pop(list)->val;
+		int len_temp = strlen(temp);
+		if (len + len_temp + 1 + 1 > ret_len) {
+			ret_len = ret_len * 2;
+			/* ret = krealloc(ret, ret_len); */
+			ret = kmalloc(ret_len);
+			len = len + len_temp + 1;
+		}
+		strcat(ret, delim);
+		strcat(ret, temp);
+	}
+	return ret;
+}
-- 
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