Fix rename double ended queue files

Also add gitignore.

2 files changed, 178 insertions, 0 deletions

diff --git a/collections/double_ended_queue.c b/collections/double_ended_queue.c
new file mode 100644
index 0000000..76856f2
--- /dev/null
+++ b/collections/double_ended_queue.c
@@ -0,0 +1,162 @@
+#include "vector.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include <stdio.h>
+
+#define START_SIZE 64;
+
+struct vector {
+	void **base, **new, **ptr;
+	int i, limit;
+};
+
+vec* vec_new()
+{
+	vec *root;
+
+	root = malloc(sizeof(vec));
+	assert(root);
+
+	root->limit = START_SIZE;
+	root->base = root->new = root->ptr = malloc(root->limit * sizeof(void*));
+	assert(root->base);
+
+	return root;
+}
+
+vec* vec_with_capacity(n)
+int n;
+{
+	vec *root;
+
+	root = malloc(sizeof(vec));
+	assert(root);
+
+	root->limit = n;
+	root->base = root->new = root->ptr = malloc(root->limit * sizeof(void*));
+	assert(root->base);
+
+	return root;
+}
+
+int vec_size(root)
+vec *root;
+{
+	if (!root) {
+		return -1;
+	}
+	return (root->new - root->ptr);
+}
+
+void vec_resize(root)
+vec *root;
+{
+	if (root->ptr != root->base) {
+		memmove(root->base, root->ptr, root->new - root->ptr);
+		root->new = root->base + vec_size(root);
+		root->ptr = root->base;
+	} else {
+		root->base = malloc(root->limit * 2 * sizeof(void*));
+		assert(root->base);
+
+
+		root->base = memcpy(root->base, root->ptr, root->limit * sizeof(void*));
+		assert(root->base);
+
+
+		root->new = root->base + vec_size(root);
+		root->limit = root->limit * 2;
+
+		free(root->ptr);
+		root->ptr = root->base;
+	}
+}
+
+void vec_push(root, item)
+vec *root;
+void *item;
+{
+	if (!root) {
+		return;
+	}
+	if (root->new == root->base + root->limit) {
+		vec_resize(root);
+	}
+
+	*(root->new++) = item;
+}
+
+void* vec_rmfirst(root)
+vec *root;
+{
+	void* tmp;
+	if (!root || root->ptr == root->new) {
+		return NULL;
+	}
+
+	return tmp = *(root->ptr++);
+}
+
+void* vec_index(root, index)
+vec *root;
+int index;
+{
+	if (!root || root->ptr + index >= root->new) {
+		return NULL;
+	}
+
+	return root->ptr[index];
+}
+
+void* vec_pop(root)
+vec *root;
+{
+	void* tmp;
+	if (!root || root->new == root->ptr) {
+		return NULL;
+	}
+
+	return tmp = *(--root->new);
+}
+
+void vec_free(root)
+vec *root;
+{
+	free(root->base);
+	root->base = NULL;
+	root->new = NULL;
+	root->ptr = NULL;
+
+	free(root);
+}
+
+void vec_print(root)
+vec *root;
+{
+	void **tmp;
+
+	fprintf(stderr, "VEC[b: %p, p: %p, n:%p]:\n\t ",
+			root->base, root->ptr, root->new);
+	for (tmp = root->ptr; tmp < root->new; tmp++){
+		fprintf(stderr, "[%p]", *tmp);
+	}
+	fprintf(stderr, "\n");
+}
+
+vec* vec_cp(root)
+vec *root;
+{
+	vec *copy;
+
+	copy = vec_with_capacity(root->limit);
+
+	copy->base = memcpy(copy->base, root->ptr,
+			vec_size(root) * sizeof(void*));
+	assert(copy->base);
+
+	copy->ptr = copy->base;
+	copy->new = copy->base + vec_size(root);
+}
diff --git a/collections/double_ended_queue.h b/collections/double_ended_queue.h
new file mode 100644
index 0000000..0c7bdce
--- /dev/null
+++ b/collections/double_ended_queue.h
@@ -0,0 +1,16 @@
+#ifndef VECTOR_H
+#define VECTOR_H
+
+typedef struct vector vec;
+
+vec* vec_new();
+vec* vec_with_capacity(int);
+int vec_size(vec*);
+void vec_push(vec*, void*);
+void* vec_rmfirst(vec*);
+void* vec_index(vec*, int);
+void vec_free(vec*);
+void* vec_pop(vec*);
+void vec_print(vec*);
+vec* vec_cp(vec*);
+#endif