chore: clang-format and formatting

.clang-format

@@ -0,0 +1,48 @@
+BasedOnStyle: LLVM
+
+# Pointer/Reference alignment: int * p, void (* callback)(...)
+PointerAlignment: Middle
+ReferenceAlignment: Middle
+
+# Line length
+ColumnLimit: 100
+
+# Return type on its own line
+BreakAfterReturnType: All
+
+# Params each on their own line
+BinPackParameters: false
+
+# Indentation
+IndentWidth: 4
+TabWidth: 4
+UseTab: Never
+ContinuationIndentWidth: 4
+
+# Braces always on their own line (Allman style)
+BreakBeforeBraces: Allman
+
+# No blank line after opening {
+KeepEmptyLinesAtTheStartOfBlocks: false
+
+# Space after C-style cast: (uint32_t) x
+SpaceAfterCStyleCast: true
+
+# Spaces
+SpaceInEmptyParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+
+# Allow single-line if without braces
+AllowShortIfStatementsOnASingleLine: WithoutElse
+
+# Include sorting
+SortIncludes: CaseSensitive
+IncludeBlocks: Regroup
+
+# Short constructs
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortLoopsOnASingleLine: false
+
+# Comments
+ReflowComments: true

.clang-tidy

@@ -0,0 +1,29 @@
+Checks: >
+  bugprone-*,
+  cert-*,
+  clang-analyzer-*,
+  misc-*,
+  performance-*,
+  portability-*,
+  readability-*,
+  -readability-magic-numbers,
+  -readability-identifier-length,
+  -readability-function-cognitive-complexity,
+  -readability-braces-around-statements,
+  -cert-err33-c,
+  -misc-include-cleaner
+
+CheckOptions:
+  - key: bugprone-easily-swappable-parameters.MinimumLength
+    value: 3
+  - key: readability-identifier-naming.FunctionCase
+    value: lower_case
+  - key: readability-identifier-naming.VariableCase
+    value: lower_case
+  - key: readability-identifier-naming.MacroDefinitionCase
+    value: UPPER_CASE
+  - key: readability-identifier-naming.TypedefCase
+    value: CamelCase
+
+HeaderFilterRegex: '.*'
+FormatStyle: file

include/pauldb/storage.h

@@ -2,112 +2,46 @@
 #ifndef PAULDB_STORAGE_H
 #define PAULDB_STORAGE_H
 
-#include <stdint.h>
 #include <stddef.h>
+#include <stdint.h>
 
 #ifdef __cplusplus
-extern "C"
-{
+extern "C" {
 
 #endif
 
 /* --- Page Management --- */
 typedef struct Page Page;
 
-Page *
-page_create
-(
-	uint32_t page_id
-);
+Page * page_create(uint32_t page_id);
 
-int
-page_insert
-(
-	Page *p,
-	const void *data,
-	size_t len
-);
+int page_insert(Page * p, const void * data, size_t len);
 
-void *
-page_get
-(
-	Page *p,
-	uint16_t slot_id,
-	size_t *out_len
-);
+void * page_get(Page * p, uint16_t slot_id, size_t * out_len);
 
-void
-page_free
-(
-	Page *p
-);
+void page_free(Page * p);
 
 /* --- Heap (Multi-Page Row Store / Delta) --- */
 typedef struct Heap Heap;
 
-Heap *
-heap_create
-(
-	void
-);
+Heap * heap_create(void);
 
-int
-heap_insert
-(
-	Heap *h,
-	const void *data,
-	size_t len
-);
+int heap_insert(Heap * h, const void * data, size_t len);
 
-void
-heap_full_scan
-(
-	Heap *h,
-	void (*callback)
-	(
-		const void *,
-		size_t
-	)
-);
+void heap_full_scan(Heap * h, void (*callback)(const void *, size_t));
 
-void
-heap_free
-(
-	Heap *h
-);
+void heap_free(Heap * h);
 
 /* --- B+Tree Index --- */
 typedef struct BTree BTree;
 
-BTree *
-btree_create
-(
-	void
-);
+BTree * btree_create(void);
 
-int
-btree_insert
-(
-	BTree *bt,
-	int64_t key,
-	uint32_t page_id,
-	uint16_t slot_id
-);
+int btree_insert(BTree * bt, int64_t key, uint32_t page_id, uint16_t slot_id);
 
-int
-btree_lookup
-(
-	BTree *bt,
-	int64_t key,
-	uint32_t *out_page,
-	uint16_t *out_slot
-);
+int btree_lookup(BTree * bt, int64_t key, uint32_t * out_page, uint16_t * out_slot);
 
-void
-btree_free
-(
-	BTree *bt
-);
+void btree_free(BTree * bt);
 
 #ifdef __cplusplus
 }

src/storage/page.c

@@ -26,90 +26,70 @@
 
 typedef struct
 {
-	uint32_t page_id;
-	uint16_t num_slots;
-	uint16_t free_space_offset;
+    uint32_t page_id;
+    uint16_t num_slots;
+    uint16_t free_space_offset;
 } PageHeader;
 
 typedef struct
 {
-	uint16_t offset;
-	uint16_t length;
+    uint16_t offset;
+    uint16_t length;
 } Slot;
 
 /* oeffentliche Page-Struktur (opak nach aussen) */
 struct Page
 {
-	uint8_t raw[PAGE_SIZE];
+    uint8_t raw[PAGE_SIZE];
 };
 
 /* ---- Hilfsfunktionen ---- */
 
 static PageHeader *
-header
-(
-	Page *p
-)
+header(Page * p)
 {
-	return (PageHeader *) p->raw;
+    return (PageHeader *) p->raw;
 }
 
 /* ---- API ---- */
 
 Page *
-page_create
-(
-	uint32_t page_id
-)
+page_create(uint32_t page_id)
 {
-	Page *p = malloc(sizeof(Page));
-	if (!p)
-		return NULL;
+    Page * p = malloc(sizeof(Page));
+    if (!p) return NULL;
 
-	memset(p->raw, 0, PAGE_SIZE);
+    memset(p->raw, 0, PAGE_SIZE);
 
-	PageHeader *h = header(p);
-	h->page_id = page_id;
-	h->num_slots = 0;
-	h->free_space_offset = PAGE_SIZE;
+    PageHeader * h = header(p);
+    h->page_id = page_id;
+    h->num_slots = 0;
+    h->free_space_offset = PAGE_SIZE;
 
-	return p;
+    return p;
 }
 
 void
-page_free
-(
-	Page *p
-)
+page_free(Page * p)
 {
-	free(p);
+    free(p);
 }
 
 /* page_insert und page_get folgen im naechsten TDD-Zyklus */
 int
-page_insert
-(
-	Page *p,
-	const void *data,
-	size_t len
-)
+page_insert(Page * p, const void * data, size_t len)
 {
-	(void) p;
-	(void) data;
-	(void) len;
-	return -1; /* noch nicht implementiert */
+    (void) p;
+    (void) data;
+    (void) len;
+    return -1; /* noch nicht implementiert */
 }
 
 void *
-page_get
-(
-	Page *p,
-	uint16_t slot_id,
-	size_t *out_len
-)
+page_get(Page * p, uint16_t slot_id, size_t * out_len)
 {
-	(void) p;
-	(void) slot_id;
-	(void) out_len;
-	return NULL; /* noch nicht implementiert */
+    (void) p;
+    (void) slot_id;
+    (void) out_len;
+    return NULL; /* noch nicht implementiert */
 }

test/storage/test_page.c

@@ -4,31 +4,27 @@
  * RED   -> diese Datei schreiben, noch kein page.c -> Linker-Fehler
  * GREEN -> page_create() + page_free() in page.c implementieren
  */
+#include "pauldb/storage.h"
+
 #include <assert.h>
 #include <stdio.h>
 
-#include "pauldb/storage.h"
+static void
+test_create_returns_non_null(void)
+{
+    Page * p = page_create(42);
+    assert(p != NULL);
+    page_free(p);
+    printf("  OK: page_create(42) returns non-NULL\n");
+}
 
 static void
-test_create_returns_non_null
-(
-	void
-)
-{
-	Page *p = page_create(42);
-	assert(p != NULL);
-	page_free(p);
-	printf("  OK: page_create(42) returns non-NULL\n");
-}
 
 int
-main
-(
-	void
-)
+main(void)
 {
-	printf("=== test_page ===\n");
-	test_create_returns_non_null();
-	printf("All tests passed.\n");
-	return 0;
+    printf("=== test_page ===\n");
+    test_create_returns_non_null();
+    printf("All tests passed.\n");
+    return 0;
 }