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/*
Copyright (C) 2015-2020, Dirk Krause
SPDX-License-Identifier: BSD-3-Clause
*/

/*
	WARNING: This file was generated by the dkct program (see
	http://dktools.sourceforge.net/ for details).
	Changes you make here will be lost if dkct is run again!
	You should modify the original source and run dkct on it.
	Original source: dk4fdrda.ctr
*/

/**	@file dk4fdrda.c The dk4fdrda module.
*/


#line 55 "dk4fdrda.ctr"

#include "dk4conf.h"
#include "dk4fdrda.h"
#include "dk4fdrde.h"

#if DK4_HAVE_UNISTD_H
#ifndef UNISTD_H_INCLUDED
#include <unistd.h>
#define	UNISTD_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_ERRNO_H
#ifndef ERRNO_H_INCLUDED
#include <errno.h>
#define	ERRNO_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_IO_H
#ifndef IO_H_INCLUDED
#include <io.h>
#define IO_H_INCLUDED 1
#endif
#endif





#line 84 "dk4fdrda.ctr"



#ifdef RW_MAX
#undef RW_MAX
#endif
#if DK4_ON_WINDOWS
/**     Maximum number of bytes for read or write operation.
*/
#define RW_MAX  (INT_MAX)
#else
/**     Maximum number of bytes for read or write operation.
*/
#define RW_MAX  ((SIZE_MAX) / 2U)
#endif


int
dk4fd_read_app(
  int fd, void *buffer, size_t *psz, const dkChar *fn, dk4_app_t *app
)
{
#if DK4_ON_WINDOWS
  int		 res;
#else
  ssize_t	 res;
#endif
  int		 back = 0;

  

#line 114 "dk4fdrda.ctr"
  if ((-1 != fd) && (NULL != buffer) && (NULL != psz)) {
    if (0 < *psz) {
      if ((dk4_um_t)RW_MAX >= (dk4_um_t)(*psz)) {
        errno = 0;
#if DK4_ON_WINDOWS
	res = _read(fd, buffer, (unsigned)(*psz));
#else
	res = read(fd, buffer, *psz);
#endif
	if (0 <= res) {
	  if (0 < res) {	

#line 125 "dk4fdrda.ctr"
	    back = 1;
	    *psz = (size_t)res;
	  } else {		

#line 128 "dk4fdrda.ctr"
	    back = 1;
	    *psz = (size_t)0;
	  }
	} else {		

#line 132 "dk4fdrda.ctr"
	  dk4fd_read_error_msg(app, fn, errno);
	}
      }
    } else {			

#line 136 "dk4fdrda.ctr"
    }
  } else {			

#line 138 "dk4fdrda.ctr"
  } 

#line 139 "dk4fdrda.ctr"
  return back;
}