#include "libufdt_sysdeps.h"

#include <debug.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>

#ifndef DTO_DISABLE_DEFAULT_VENDOR_LIBC_PRINT
int dto_print(const char *fmt, ...) {
  int err;

  va_list ap;
  va_start(ap, fmt);
  err = _dvprintf(fmt, ap);
  va_end(ap);

  return err;
}
#endif

/* Codes from
 * https://android.googlesource.com/platform/bionic.git/+/eclair-release/libc/stdlib/qsort.c
 * Start
 */

/* $OpenBSD: qsort.c,v 1.10 2005/08/08 08:05:37 espie Exp $ */
/*-
 * Copyright (c) 1992, 1993
 * The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

static __inline char *med3(char *, char *, char *,
                           int (*)(const void *, const void *));
static __inline void swapfunc(char *, char *, int, int);
#define min(a, b) (a) < (b) ? a : b

/*
 * Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".
 */
#define swapcode(TYPE, parmi, parmj, n) \
  {                                     \
    long i = (n) / sizeof(TYPE);        \
    TYPE *pi = (TYPE *)(parmi);         \
    TYPE *pj = (TYPE *)(parmj);         \
    do {                                \
      TYPE t = *pi;                     \
      *pi++ = *pj;                      \
      *pj++ = t;                        \
    } while (--i > 0);                  \
  }
#define SWAPINIT(a, es)                                                  \
  swaptype = ((char *)a - (char *)0) % sizeof(long) || es % sizeof(long) \
                 ? 2                                                     \
                 : es == sizeof(long) ? 0 : 1;

static __inline void swapfunc(char *a, char *b, int n, int swaptype) {
  if (swaptype <= 1) swapcode(long, a, b, n) else swapcode(char, a, b, n)
}

#define swap(a, b)               \
  if (swaptype == 0) {           \
    long t = *(long *)(a);       \
    *(long *)(a) = *(long *)(b); \
    *(long *)(b) = t;            \
  } else                         \
    swapfunc(a, b, es, swaptype)
#define vecswap(a, b, n) \
  if ((n) > 0) swapfunc(a, b, n, swaptype)

static __inline char *med3(char *a, char *b, char *c,
                           int (*cmp)(const void *, const void *)) {
  return cmp(a, b) < 0 ? (cmp(b, c) < 0 ? b : (cmp(a, c) < 0 ? c : a))
                       : (cmp(b, c) > 0 ? b : (cmp(a, c) < 0 ? a : c));
}

void qsort(void *aa, size_t n, size_t es,
           int (*cmp)(const void *, const void *)) {
  char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
  int d, r, swaptype, swap_cnt;
  char *a = aa;
loop:
  SWAPINIT(a, es);
  swap_cnt = 0;
  if (n < 7) {
    for (pm = (char *)a + es; pm < (char *)a + n * es; pm += es)
      for (pl = pm; pl > (char *)a && cmp(pl - es, pl) > 0; pl -= es)
        swap(pl, pl - es);
    return;
  }
  pm = (char *)a + (n / 2) * es;
  if (n > 7) {
    pl = (char *)a;
    pn = (char *)a + (n - 1) * es;
    if (n > 40) {
      d = (n / 8) * es;
      pl = med3(pl, pl + d, pl + 2 * d, cmp);
      pm = med3(pm - d, pm, pm + d, cmp);
      pn = med3(pn - 2 * d, pn - d, pn, cmp);
    }
    pm = med3(pl, pm, pn, cmp);
  }
  swap(a, pm);
  pa = pb = (char *)a + es;

  pc = pd = (char *)a + (n - 1) * es;
  for (;;) {
    while (pb <= pc && (r = cmp(pb, a)) <= 0) {
      if (r == 0) {
        swap_cnt = 1;
        swap(pa, pb);
        pa += es;
      }
      pb += es;
    }
    while (pb <= pc && (r = cmp(pc, a)) >= 0) {
      if (r == 0) {
        swap_cnt = 1;
        swap(pc, pd);
        pd -= es;
      }
      pc -= es;
    }
    if (pb > pc) break;
    swap(pb, pc);
    swap_cnt = 1;
    pb += es;
    pc -= es;
  }
  if (swap_cnt == 0) { /* Switch to insertion sort */
    for (pm = (char *)a + es; pm < (char *)a + n * es; pm += es)
      for (pl = pm; pl > (char *)a && cmp(pl - es, pl) > 0; pl -= es)
        swap(pl, pl - es);
    return;
  }
  pn = (char *)a + n * es;
  r = min(pa - (char *)a, pb - pa);
  vecswap(a, pb - r, r);
  r = min(pd - pc, pn - pd - (int)es);
  vecswap(pb, pn - r, r);
  if ((r = pb - pa) > (int)es) qsort(a, r / es, es, cmp);
  if ((r = pd - pc) > (int)es) {
    /* Iterate rather than recurse to save stack space */
    a = pn - r;
    n = r / es;
    goto loop;
  }
  /* qsort(pn - r, r / es, es, cmp); */
}

/* End of the copied qsort. */

void dto_qsort(void *base, size_t nmemb, size_t size,
               int (*compar)(const void *, const void *)) {
  qsort(base, nmemb, size, compar);
}

/* Assuming the following functions are already defined in the
 * bootloader source with the names conforming to POSIX.
 */

#ifndef DTO_DISABLE_DEFAULT_VENDOR_LIBC_ALLOCATION
void *dto_malloc(size_t size) { return malloc(size); }

void dto_free(void *ptr) { free(ptr); }
#endif

char *dto_strchr(const char *s, int c) { return strchr(s, c); }

unsigned long int dto_strtoul(const char *nptr, char **endptr, int base) {
  return strtoul(nptr, endptr, base);
}

size_t dto_strlen(const char *s) { return strlen(s); }

int dto_memcmp(const void *lhs, const void *rhs, size_t n) {
  return memcmp(lhs, rhs, n);
}

void *dto_memcpy(void *dest, const void *src, size_t n) {
  return memcpy(dest, src, n);
}

int dto_strcmp(const char *s1, const char *s2) { return strcmp(s1, s2); }

int dto_strncmp(const char *s1, const char *s2, size_t n) {
  return strncmp(s1, s2, n);
}

void *dto_memchr(const void *s, int c, size_t n) { return memchr(s, c, n); }

void *dto_memset(void *s, int c, size_t n) { return memset(s, c, n); }
