/* Copyright (C) 2015 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 2013 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 2001 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 2000 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 1999 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 1996 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
#include <libc/stubs.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libc/file.h>

size_t
fwrite(const void *vptr, size_t size, size_t count, FILE *f)
{
  const char *ptr = (const char *)vptr;
  ssize_t s;

  if (__libc_write_termios_hook
      && !(f->_flag & (_IOTERM | _IONTERM)))
  {
    /* first time we see this handle--see if termios hooked it */
    if (isatty(f->_file))
      f->_flag |= _IOTERM;
    else
      f->_flag |= _IONTERM;
  }

  s = size * count;
  if (!__is_text_file(f))
  {
    if (f->_flag & _IOLBF)
    {
      while (s > 0)
      {
        long signed int negative_bufsiz = -f->_bufsiz;

        if (--f->_cnt > negative_bufsiz && *(const char *)ptr != '\n')
          *f->_ptr++ = *(const char *)ptr++;
        else if (_flsbuf(*(const char *)ptr++, f) == EOF)
          break;
        s--;
      }
    }
    else while (s > 0)
    {
      if (f->_cnt < s)
      {
        if (f->_cnt > 0)
        {
          memcpy(f->_ptr, ptr, f->_cnt);
          ptr += f->_cnt;
          f->_ptr += f->_cnt;
          s -= f->_cnt;
        }
        if (_flsbuf(*(const unsigned char *)ptr++, f) == EOF)
          break;
        s--;
      }
      if (f->_cnt >= s)
      {
        memcpy(f->_ptr, ptr, s);
        f->_ptr += s;
        f->_cnt -= s;
        return count;
      }
    }
  }
  else
  {
    if (f->_flag & _IOLBF)
    {
      while (s > 0)
      {
        long signed int negative_bufsiz = -f->_bufsiz;

        if (*ptr=='\n')
        {
          if (--f->_cnt > negative_bufsiz)
            *f->_ptr++ = '\r';
          else
            if (_flsbuf('\r', f) == EOF)
              break;
        }
        if (--f->_cnt > negative_bufsiz && *ptr != '\n')
          *f->_ptr++ = *ptr++;
        else if (_flsbuf(*(const unsigned char *)ptr++, f) == EOF)
          break;
        s--;
      }
    }
    else
    {
      while (s > 0)
      {
        if (*ptr == '\n')
        {
          if(--f->_cnt >= 0)
            *f->_ptr++ = '\r';
          else
            if (_flsbuf('\r', f) == EOF)
              break;
        }
        if (--f->_cnt >= 0)
          *f->_ptr++ = *ptr++;
        else
          if (_flsbuf(*(const unsigned char *)ptr++, f) == EOF)
            break;
        s--;
      }
    }
  }
  return size != 0 ? count - ((s + size - 1) / size) : 0;
}