// Config

#include <stddef.h>
#include <dlmalloc/malloc.h>
#include <uprintf.h>
#include <errors.h>
#include <sync/spinlock.h>
#include <string/string.h>
#include <sysdefs/mman.h>
#include <system/system.h>

#define USE_DL_PREFIX 1
#define LACKS_SYS_TYPES_H 1
#define NO_MALLOC_STATS 1
#define LACKS_ERRNO_H 1
#define LACKS_TIME_H 1
#define LACKS_STDLIB_H 1
#define LACKS_SYS_MMAN_H 1
#define LACKS_FCNTL_H 1
#define LACKS_UNISTD_H 1
#define LACKS_SYS_PARAM_H 1
#define LACKS_STRINGS_H 1
#define LACKS_SCHED_H 1
#define HAVE_MMAP 0
#define MORECORE_CONTIGUOUS 0
#define ABORT \
  do { \
    uprintf("dlmalloc: Aborting...\n"); \
  } while(0)
#define MALLOC_FAILURE_ACTION
#define HAVE_MORECORE 1
#define USE_LOCKS 2
#define malloc_getpagesize 0x1000
#define EINVAL E_INVALIDARGUMENT
#define ENOMEM E_NOMEMORY

#define MLOCK_T SpinLock

int ACQUIRE_LOCK(SpinLock *sl) {
  spinlock_acquire(sl);
  return 0;
}

int RELEASE_LOCK(SpinLock *sl) {
  spinlock_release(sl);
  return 0;
}

int INITIAL_LOCK(SpinLock *sl) {
  spinlock_init(sl);
  return 0;
}
    
static MLOCK_T malloc_global_mutex = { 0 };

#define PAGE_SIZE 0x1000

static size_t _roundpage(size_t sz) {
  return (sz + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1);
}

void *_last = 0;

void *sbrk(ptrdiff_t inc) {
  if (inc < 0) {
    return 0;
  }
  if (!inc) {
    return _last;
  }

  uint64_t pages = _roundpage(inc);
  uint8_t *maddr = NULL;
  int32_t ret = mman_map(NULL, pages, MMAN_MAP_PF_RW, 0, &maddr);
  if (ret != E_OK || maddr == NULL) {
    return 0;
  }
  string_memset(maddr, 0, pages);
  _last = (void *)(maddr + pages);
  return maddr;
}