#ifndef _PDCLIB_IO_H
#define _PDCLIB_IO_H
#include "_PDCLIB_int.h"
#include "_PDCLIB_threadconfig.h"

/* PDCLib internal I/O logic <_PDCLIB_int.h>

   This file is part of the Public Domain C Library (PDCLib).
   Permission is granted to use, modify, and / or redistribute at will.
*/

/* Flags for representing mode (see fopen()). Note these must fit the same
   status field as the _IO?BF flags in <stdio.h> and the internal flags below.
*/
#define _PDCLIB_FREAD     8u
#define _PDCLIB_FWRITE   16u
#define _PDCLIB_FAPPEND  32u 
#define _PDCLIB_FRW      64u
#define _PDCLIB_FBIN    128u

/* Internal flags, made to fit the same status field as the flags above. */
/* -------------------------------------------------------------------------- */
/* free() the buffer memory on closing (false for user-supplied buffer) */
#define _PDCLIB_FREEBUFFER   512u
/* stream has encountered error / EOF */
#define _PDCLIB_ERRORFLAG   1024u
#define _PDCLIB_EOFFLAG     2048u
/* stream is wide-oriented */
#define _PDCLIB_WIDESTREAM  4096u
/* stream is byte-oriented */
#define _PDCLIB_BYTESTREAM  8192u
/* file associated with stream should be remove()d on closing (tmpfile()) */
#define _PDCLIB_DELONCLOSE 16384u
/* stream handle should not be free()d on close (stdin, stdout, stderr) */
#define _PDCLIB_STATIC     32768u

/* Position / status structure for getpos() / fsetpos(). */
struct _PDCLIB_fpos_t
{
    _PDCLIB_uint64_t offset; /* File position offset */
    int              status; /* Multibyte parsing state (unused, reserved) */
};

/* FILE structure */
struct _PDCLIB_file_t
{
    _PDCLIB_fd_t            handle;   /* OS file handle */
    _PDCLIB_MTX_T           lock;     /* file lock */
    char *                  buffer;   /* Pointer to buffer memory */
    _PDCLIB_size_t          bufsize;  /* Size of buffer */
    _PDCLIB_size_t          bufidx;   /* Index of current position in buffer */
    _PDCLIB_size_t          bufend;   /* Index of last pre-read character in buffer */
    struct _PDCLIB_fpos_t   pos;      /* Offset and multibyte parsing state */
    _PDCLIB_size_t          ungetidx; /* Number of ungetc()'ed characters */
    unsigned char *         ungetbuf; /* ungetc() buffer */
    unsigned int            status;   /* Status flags; see above */
    /* multibyte parsing status to be added later */
    char *                  filename; /* Name the current stream has been opened with */
    struct _PDCLIB_file_t * next;     /* Pointer to next struct (internal) */
};


#endif