Add and run WebKit based clang-format

.clang-format

@@ -0,0 +1,2 @@
+
+BasedOnStyle: WebKit

src/alloc_backend.c

@@ -20,8 +20,7 @@ void* call_alloc_backend(size_t size)
         MAP_ANONYMOUS | MAP_PRIVATE,
         -1, /* man mmap(2): "[...], some implementations require fd to be
                -1 if MAP_ANONYMOUS is specified [...]" */
-            0
-    );
+        0);
 
     if (p == MAP_FAILED)
         return NULL;

src/arena.c

@@ -32,7 +32,6 @@ struct arena* arena_new()
     return (arena_t*)a;
 }
 
-
 /*
  * Frees all memory in arena
  */
@@ -41,7 +40,6 @@ void arena_reset(struct arena *a)
     a->next = a->begin;
 }
 
-
 /*
  * Allocate new memory using arena
  */
@@ -57,4 +55,3 @@ void* arena_alloc(struct arena *a, size_t len)
 
     return p;
 }
-

src/arena.h

@@ -14,5 +14,4 @@ arena_t* arena_new();
 void arena_reset(arena_t* a);
 void* arena_alloc(arena_t* a, size_t len);
 
-
 #endif

src/test_arena.c

@@ -1,6 +1,5 @@
 
 
-
 // _start test_arena_alloc.c
 #include "arena.h"
 
@@ -19,14 +18,17 @@ int main()
         err(errno, "failed to allocate arena");
     }
 
-	printf("\ntest 1: %s", "attempt to allocate arena->cap x 1 byte");
+    printf("\nAttempt to do `arena->cap` allocations of 1 byte");
 
     for (size_t i = 0; i < default_arena->cap; i++) {
-		volatile void *c = arena_alloc(default_arena, 1);
+        char* c = arena_alloc(default_arena, 1);
+        *c = i & 0xff;
         if (c == NULL) {
             err(EXIT_FAILURE, "failed to allocate memory");
         }
     }
 
+    printf("\n    OK");
+
     return 0;
 }