Replace samples for C language

samples/C/array.c

@@ -0,0 +1,45 @@
+#include <array.h>
+
+unsigned __bump_up(unsigned n) {
+    unsigned base = 1;
+    --n;
+    while (base < sizeof n * 8) {
+        n |= n >> base;
+        base *= 2;
+    }
+    ++n;
+    n += (n == 0);
+    return n;
+}
+
+void *__array_alloc(size_t size, unsigned length) {
+    unsigned allocated = __bump_up(length);
+    struct __array_header *head = malloc(sizeof *head + allocated * size);
+    assert(head);
+    head->length = length;
+    head->allocated = allocated;
+    return (void *) (head + 1);
+}
+
+void __array_resize(void **array, size_t size, int difference) {
+    if (difference == 0) {
+        return;
+    }
+    struct __array_header *head = __header(*array);
+    head->length += difference;
+    if (head->length >= head->allocated) {
+        head->allocated = __bump_up(head->length);
+        head = realloc(head, sizeof *head + head->allocated * size);
+        assert(head);
+        *array = head + 1;
+    }
+}
+
+int __array_search(void *array, void *elem, size_t size) {
+    for (unsigned i = 0; i < alength(array) * size; i += size) {
+        if (memcmp((char *)array + i, elem, size) == 0) {
+            return 1;
+        }
+    }
+    return 0;
+}