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chore: transfer all KBs to single one

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Signed-off-by: Matej Focko <mfocko@redhat.com>
This commit is contained in:
Matej Focko 2022-11-05 15:24:54 +01:00
parent d207e870d4
commit 7427475022
Signed by: mfocko
GPG key ID: 7C47D46246790496
159 changed files with 28847 additions and 0 deletions

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#include "dynlist.h"
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
void dynamic_array_init(struct dynamic_array_t *arr, size_t size)
{
if (arr == NULL)
{
return;
}
arr->data = NULL;
arr->count = 0;
arr->capacity = 0;
arr->size = size;
}
void dynamic_array_destroy(struct dynamic_array_t *arr)
{
if (arr == NULL)
{
return;
}
if (arr->data != NULL)
{
free(arr->data);
arr->data = NULL;
}
arr->count = 0;
arr->capacity = 0;
}
void *dynamic_array_at(struct dynamic_array_t *arr, size_t index)
{
if (arr == NULL || index >= arr->count)
{
return NULL;
}
return arr->data + index * arr->size;
}
void *dynamic_array_front(struct dynamic_array_t *arr)
{
if (arr == NULL || arr->count < 1)
{
return NULL;
}
return arr->data;
}
void *dynamic_array_back(struct dynamic_array_t *arr)
{
if (arr == NULL || arr->count < 1)
{
return NULL;
}
return arr->data + (arr->count - 1) * arr->size;
}
/**
* @brief Resize the dynamic array when needed.
* @param arr Array to be resized.
* @returns <code>true</code> if resizing was successful or array was not resized,
* <code>false</code> otherwise.
*/
static bool dynamic_array_resize(struct dynamic_array_t *arr)
{
if (arr == NULL || arr->count < arr->capacity)
{
return true;
}
size_t new_capacity = arr->capacity ? (arr->capacity * 2) : 16;
void *new_data = realloc(arr->data, new_capacity * arr->size);
if (new_data == NULL)
{
// failed to reallocate memory
return false;
}
arr->data = new_data;
arr->capacity = new_capacity;
return true;
}
bool dynamic_array_push_back(struct dynamic_array_t *arr, void *data)
{
if (arr == NULL || data == NULL)
{
return false;
}
if (!dynamic_array_resize(arr))
{
// failed to reallocate memory
return false;
}
memcpy(dynamic_array_at(arr, arr->count), data, arr->size);
arr->count++;
return true;
}
void dynamic_array_pop_back(struct dynamic_array_t *arr)
{
if (arr == NULL || arr->count < 1)
{
return;
}
arr->count--;
}
void dynamic_array_extend(struct dynamic_array_t *arr, struct dynamic_array_t *src)
{
if (arr == NULL || src == NULL)
{
return;
}
for (size_t i = 0; i < src->count; i++)
{
dynamic_array_push_back(arr, dynamic_array_at(src, i));
}
}
void dynamic_array_clear(struct dynamic_array_t *arr)
{
if (arr == NULL)
{
return;
}
arr->count = 0;
}

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#include <stdbool.h>
#include <stdlib.h>
struct dynamic_array_t
{
char *data;
size_t count;
size_t capacity;
size_t size;
};
/**
* @brief Initializes dynamic array. Sets size of single element and zeroes
* everything else.
* @param arr Array to be initialized.
* @param size Size of one element in the array.
*/
void dynamic_array_init(struct dynamic_array_t *arr, size_t size);
/**
* @brief Destroys dynamic array. Deallocates all the memory and resets fields.
* @param arr Array to be destroyed.
*/
void dynamic_array_destroy(struct dynamic_array_t *arr);
/**
* @brief Returns pointer to the element on the given index.
* @param arr Array containing the element.
* @param index Index of the element.
* @returns Pointer to the element, <code>NULL</code> if index is out of bounds.
*/
void *dynamic_array_at(struct dynamic_array_t *arr, size_t index);
/**
* @brief Returns pointer to the first element of the array.
* @param arr Array containing the element.
* @returns Pointer to the first element, <code>NULL</code> if no elements are
* present.
*/
void *dynamic_array_front(struct dynamic_array_t *arr);
/**
* @brief Returns pointer to the last element of the array.
* @param arr Array containing the element.
* @returns Pointer to the last element, <code>NULL</code> if no elements are
* present.
*/
void *dynamic_array_back(struct dynamic_array_t *arr);
/**
* @brief Adds element to the end of the array.
* @param arr Array where the element is to be added.
* @param data Pointer to the data, that are to be copied into the array.
* @returns <code>true</code> if element added successfully, <code>false</code>
* otherwise.
*/
bool dynamic_array_push_back(struct dynamic_array_t *arr, void *data);
/**
* @brief Removes last element from the array.
* @param arr Array from which the last element is to be removed.
*/
void dynamic_array_pop_back(struct dynamic_array_t *arr);
/**
* @brief Extends array with the elements from another array.
* @param arr Array to be extended.
* @param src Array from which the elements are copied.
*/
void dynamic_array_extend(struct dynamic_array_t *arr, struct dynamic_array_t *src);
/**
* @brief Clears out the array.
* @param arr Array to be cleared.
*/
void dynamic_array_clear(struct dynamic_array_t *arr);

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csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
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#### Naming styles ####
# Naming rules
dotnet_naming_rule.interface_should_be_begins_with_i.severity = suggestion
dotnet_naming_rule.interface_should_be_begins_with_i.symbols = interface
dotnet_naming_rule.interface_should_be_begins_with_i.style = begins_with_i
dotnet_naming_rule.types_should_be_pascal_case.severity = suggestion
dotnet_naming_rule.types_should_be_pascal_case.symbols = types
dotnet_naming_rule.types_should_be_pascal_case.style = pascal_case
dotnet_naming_rule.non_field_members_should_be_pascal_case.severity = suggestion
dotnet_naming_rule.non_field_members_should_be_pascal_case.symbols = non_field_members
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dotnet_naming_symbols.interface.applicable_kinds = interface
dotnet_naming_symbols.interface.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
dotnet_naming_symbols.interface.required_modifiers =
dotnet_naming_symbols.types.applicable_kinds = class, struct, interface, enum
dotnet_naming_symbols.types.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
dotnet_naming_symbols.types.required_modifiers =
dotnet_naming_symbols.non_field_members.applicable_kinds = property, event, method
dotnet_naming_symbols.non_field_members.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
dotnet_naming_symbols.non_field_members.required_modifiers =
# Naming styles
dotnet_naming_style.pascal_case.required_prefix =
dotnet_naming_style.pascal_case.required_suffix =
dotnet_naming_style.pascal_case.word_separator =
dotnet_naming_style.pascal_case.capitalization = pascal_case
dotnet_naming_style.begins_with_i.required_prefix = I
dotnet_naming_style.begins_with_i.required_suffix =
dotnet_naming_style.begins_with_i.word_separator =
dotnet_naming_style.begins_with_i.capitalization = pascal_case

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static/files/ib002/iterative-and-iterators/graphs.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
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using System.Collections.Generic;
namespace graphs {
class BFS<T> where T : notnull {
private Graph<T> graph;
private Dictionary<T, int> Distance = new Dictionary<T, int>();
private Dictionary<T, T?> Parent = new Dictionary<T, T?>();
private Dictionary<T, Color> State = new Dictionary<T, Color>();
public BFS(Graph<T> graph) {
this.graph = graph;
}
public BFS<T> Run() {
foreach (var vertex in graph.Vertices) {
if (ColorOf(vertex) == Color.White) {
RunFrom(vertex);
}
}
return this;
}
public BFS<T> RunFrom(T start) {
State[start] = Color.Gray;
Distance[start] = 0;
Parent[start] = default(T);
var queue = new Queue<T>();
queue.Enqueue(start);
while (queue.Count > 0) {
var u = queue.Dequeue();
for (var iterator = graph.GetEdgesFrom(u); iterator.MoveNext();) {
var v = iterator.Current;
if (GetOrDefault(State, v, Color.White) == Color.White) {
State[v] = Color.Gray;
Distance[v] = Distance[u] + 1;
Parent[v] = u;
queue.Enqueue(v);
}
}
State[u] = Color.Black;
}
return this;
}
private static V GetOrDefault<U, V>(Dictionary<U, V> flags, U u, V defaultValue)
where U : notnull {
if (flags.TryGetValue(u, out var flag)) {
return flag;
}
return defaultValue;
}
public int DistanceTo(T u) => GetOrDefault(Distance, u, 0);
public T? ParentOf(T u) => GetOrDefault(Parent, u, default(T));
public Color ColorOf(T u) => GetOrDefault(State, u, Color.White);
}
}

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using System.Collections.Generic;
namespace graphs {
class DFS<T> where T : notnull {
private Graph<T> graph;
private int time;
private Dictionary<T, int> Discovered = new Dictionary<T, int>();
private Dictionary<T, int> Finished = new Dictionary<T, int>();
private Dictionary<T, Color> State = new Dictionary<T, Color>();
public DFS(Graph<T> graph) {
this.graph = graph;
}
public DFS<T> Run() {
time = 0;
foreach (var vertex in graph.Vertices) {
if (ColorOf(vertex) == Color.White) {
RunFrom(vertex, false);
}
}
return this;
}
public DFS<T> RunFrom(T start, bool reset = true) {
var path = new Stack<(T, IEnumerator<T>)>();
if (reset) {
time = 0;
}
(Discovered[start], State[start]) = (++time, Color.Gray);
path.Push((start, graph.GetEdgesFrom(start)));
while (path.Count > 0) {
var (lastVertex, successors) = path.Peek();
if (!successors.MoveNext()) {
path.Pop();
(Finished[lastVertex], State[lastVertex]) = (++time, Color.Black);
} else if (ColorOf(successors.Current) == Color.White) {
var nextVertex = successors.Current;
(Discovered[nextVertex], State[nextVertex]) = (++time, Color.Gray);
path.Push((nextVertex, graph.GetEdgesFrom(nextVertex)));
}
}
return this;
}
private static V GetOrDefault<U, V>(Dictionary<U, V> flags, U u, V defaultValue)
where U : notnull
where V : notnull {
if (flags.TryGetValue(u, out var flag)) {
return flag;
}
return defaultValue;
}
public int DiscoveredAt(T u) => GetOrDefault(Discovered, u, 0);
public int FinishedAt(T u) => GetOrDefault(Finished, u, 0);
public Color ColorOf(T u) => GetOrDefault(State, u, Color.White);
}
}

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static/files/ib002/iterative-and-iterators/src/Graph.cs Normal file
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using System.Collections.Generic;
using System.Linq;
namespace graphs {
enum Color {
White, Gray, Black
}
class Graph<T> where T : notnull {
private SortedSet<T> vertices = new SortedSet<T>();
private SortedDictionary<T, SortedSet<T>> edges = new SortedDictionary<T, SortedSet<T>>();
public SortedSet<T> Vertices {
get => vertices;
}
public void AddVertex(T u) {
vertices.Add(u);
edges.Add(u, new SortedSet<T>());
}
public void AddEdge(T u, T v) {
if (edges.TryGetValue(u, out var edgesFromU)) {
edgesFromU.Add(v);
}
}
public bool HasEdge(T u, T v) {
if (edges.TryGetValue(u, out var edgesFromU)) {
return edgesFromU.Contains(v);
}
return false;
}
public IEnumerator<T> GetEdgesFrom(T u) {
if (edges.TryGetValue(u, out var edgesFromU)) {
return edgesFromU.GetEnumerator();
}
return Enumerable.Empty<T>().GetEnumerator();
}
}
}

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static/files/ib002/iterative-and-iterators/src/Program.cs Normal file
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using System;
using System.Collections.Generic;
namespace graphs {
class Program {
static Graph<string> CreateExampleGraph() {
var vertices = new List<string>() {
"s", "q", "t", "y", "r", "v", "w", "x", "z", "u"
};
var graph = new Graph<string>();
foreach (var vertex in vertices) {
graph.AddVertex(vertex);
}
graph.AddEdge("s", "v");
graph.AddEdge("q", "s");
graph.AddEdge("q", "w");
graph.AddEdge("q", "t");
graph.AddEdge("t", "y");
graph.AddEdge("t", "x");
graph.AddEdge("y", "q");
graph.AddEdge("r", "y");
graph.AddEdge("r", "u");
graph.AddEdge("v", "w");
graph.AddEdge("w", "s");
graph.AddEdge("x", "w");
graph.AddEdge("x", "z");
graph.AddEdge("z", "x");
graph.AddEdge("u", "y");
return graph;
}
static void Main(string[] args) {
var graph = CreateExampleGraph();
var dfsTraversal = new DFS<string>(graph).Run();
foreach (var vertex in graph.Vertices) {
Console.WriteLine($"{vertex}(d: {dfsTraversal.DiscoveredAt(vertex)}, f: {dfsTraversal.FinishedAt(vertex)})");
}
}
}
}

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static/files/ib002/postcondition-ambiguity/test_sort.py Normal file
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from hypothesis import given, settings
from hypothesis.strategies import integers, lists
import pytest
import itertools
def compare_by_value(pair):
"""
Takes a pair from enumerate in form: `index, value` and returns the value
Args:
pair (Tuple[int, T]): Index and element from the iterator at the index.
Returns:
Element from the pair.
"""
index, value = pair
return value
def maximum(arr, n):
"""
Finds index of maximum element of first n elements in list.
Args:
arr (List): List of values.
n (int): Upper bound of index where to search for maximum (inclusive).
Returns:
Index of a maximum element in `arr[:n]`.
"""
first_n_elements = itertools.islice(enumerate(arr), n)
index, value = max(first_n_elements, key=compare_by_value)
return index
# Precondition: n = |A|
# Loop invariant:
# A[i + 1 : n] is sorted AND
# all elements of A[i + 1 : n] are bigger or equal to the other elements
# Postcondition: A is sorted
def select_sort(arr, n):
"""
Sorts list `arr` using select sort algorithm.
Args:
arr (List): List of values.
n (int): Size of the list.
Returns:
Sorted list `arr`.
"""
assert n == len(arr)
check_loop_invariant(arr, n, n)
for i in reversed(range(1, n)):
j = maximum(arr, i + 1)
arr[i], arr[j] = arr[j], arr[i]
check_loop_invariant(arr, n, i)
return arr
def broken_select_sort(arr, n):
assert n == len(arr)
if not arr:
return
max_value = max(arr)
check_loop_invariant(arr, n, n)
for i in reversed(range(n)):
arr[i] = max_value + i
check_loop_invariant(arr, n, i)
return arr
def check_loop_invariant(arr, n, i):
# A[i + 1 : n] is sorted
for x, y in zip(itertools.islice(arr, i + 1, n), itertools.islice(arr, i + 2, n)):
assert x <= y
# all elements of A[i + 1 : n] are bigger or equal to the other elements
if i + 1 >= n:
# in case there are no elements
return
# otherwise, since the "tail" is sorted, we can assume that it is enough to
# check the other elements to the smallest value of the tail
smallest = arr[i + 1]
for element in itertools.islice(arr, i + 1):
assert smallest >= element
def check_vague_postcondition(original_arr, arr):
if not arr:
return
# check ordering
for x, y in zip(arr, itertools.islice(arr, 1, len(arr))):
assert x <= y
def check_postcondition(original_arr, arr):
if not arr:
return
# check ordering
for x, y in zip(arr, itertools.islice(arr, 1, len(arr))):
assert x <= y
# get counts from original list
original_counts = {}
for value in original_arr:
original_counts[value] = 1 + original_counts.get(value, 0)
# get counts from resulting list
counts = {}
for value in arr:
counts[value] = 1 + counts.get(value, 0)
# if arr is permutation of original_arr then all counts must be the same
assert counts == original_counts
@given(lists(integers()))
@settings(max_examples=1000)
@pytest.mark.parametrize(
"postcondition", [check_vague_postcondition, check_postcondition]
)
@pytest.mark.parametrize("sorting_function", [select_sort, broken_select_sort])
def test_select_sort(sorting_function, postcondition, numbers):
result = sorting_function(numbers[:], len(numbers))
postcondition(numbers, result)