/* Copyright (c) 2002-2007  Marek Michalkiewicz
   Copyright (c) 2006, Carlos Lamas
   Copyright (c) 2009-2010, Jan Waclawek
   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:

   * Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
   * 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.
   * Neither the name of the copyright holders nor the names of
     contributors may be used to endorse or promote products derived
     from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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. */

/*
   pgmspace.h

   Contributors:
     Created by Marek Michalkiewicz <marekm@linux.org.pl>
     Eric B. Weddington <eric@ecentral.com>
     Wolfgang Haidinger <wh@vmars.tuwien.ac.at> (pgm_read_dword())
     Ivanov Anton <anton@arc.com.ru> (pgm_read_float())
 */

/** \file */
/** \defgroup avr_pgmspace <avr/pgmspace.h>: Program Space Utilities
    \code
    #include <avr/pgmspace.h>
    \endcode

    The functions in this module provide interfaces for a program to access
    data stored in program space (flash memory) of the device.<br>
    For a different approach using named address-spaces like #__flash,
    see \ref avr_flash "<avr/flash.h>".
    For functions to read fixed-point values from program memory,
    see \ref avr_stdfix "<stdfix.h>".

    \note These functions are an attempt to provide some compatibility with
    header files that come with IAR C, to make porting applications between
    different compilers easier.  This is not 100% compatibility though.

    \note If you are working with strings which are completely based in RAM,
    use the standard string functions described in \ref avr_string.

    \note If possible, put your constant tables in the lower 64 KiB and use
    #pgm_read_byte, #pgm_read_char or #pgm_read_u8 etc. instead of
    #pgm_read_byte_far since it is more efficient that
    way, and you can still use the upper 64 KiB for executable code.
    All functions that are suffixed with a \c _P \e require their
    arguments to be in the lower 64 KiB of the flash ROM, as they do
    not use \c ELPM instructions.  This is normally not a big concern as
    the linker setup arranges any program space constants declared
    using #PROGMEM to be placed right after the interrupt vectors,
    and in front of any executable code.  However,
    it can become a problem if there are too many of these constants, or
    for bootloaders on devices with more than 64 KiB of ROM.
    <em>All these functions will not work in that situation.</em>

    \note For <b>Xmega</b> devices, make sure the NVM controller
    command register (\c NVM.CMD or \c NVM_CMD) is set to 0x00 (NOP)
    before using any of these functions.
*/

#ifndef __PGMSPACE_H_
#define __PGMSPACE_H_ 1

#ifndef __DOXYGEN__
#define __need_size_t
#endif
#include <inttypes.h>
#include <stddef.h>

#ifndef __DOXYGEN__

#include <bits/attribs.h>
#include <bits/lpm-elpm.h>

#define PROGMEM __ATTR_PROGMEM__

#endif	/* !__DOXYGEN__ */

/** \name Macros */

/**
   \ingroup avr_pgmspace
   Attribute to use in order to declare a read-only object being located in
   far flash ROM.  This is similar to #PROGMEM, except that it puts
   the static storage object in section
   <tt>\ref sec_dot_progmemx ".progmemx.data"</tt>.
   In order to access the object,
   the <tt>pgm_read_*_far</tt> and \c _PF functions declared in this header
   can be used.  In order to get its address, see pgm_get_far_address().

   It only makes sense to put read-only objects in this section,
   though the compiler does not diagnose when this is not the case.

   As an alternative available since AVR-LibC v2.3 and avr-gcc v15,
   you can use the 24-bit address-space #__flashx and functions from
   \ref avr_flash "<avr/flash.h>" that work the same like the \c _far
   functions.

   \since AVR-LibC v2.2  */
#define PROGMEM_FAR __attribute__((__section__(".progmemx.data")))

#ifdef __DOXYGEN__

/**
   \ingroup avr_pgmspace
   Attribute to use in order to declare a read-only object in static storage
   being located in the lower 64 KiB of flash ROM.

   Objects in this section will be located in the
   <tt>\ref sec_dot_progmem ".progmem.data"</tt> section.
   In order to access PROGMEM objects:
   <dl>
   <dt>Reduced Tiny (AVRrc) devices</dt>
   <dd>No extra code is needed. Use vanilla C/C++ code to access.</dd>
   <dt>All other devices (non-AVRrc)</dt>
   <dd>(Inline) assembly must be used in order to read from <tt>PROGMEM</tt>
     objects, like for example by means of the <tt>pgm_read_xxx</tt> functions
     and macros as declared in this header.</dd>
   </dl>

   For an alternative, see the \c #__flash named address-space which is
   supported since
   <a href="https://gcc.gnu.org/gcc-4.7/changes.html#avr">avr-gcc v4.7</a>,
   and \ref avr_flash "<avr/flash.h>" which exists since AVR-LibC v2.3.  */
#define PROGMEM __attribute__((__progmem__))

/** \name Functions reading from PROGMEM */

/** \ingroup avr_pgmspace
    Read a <tt>char</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline char pgm_read_char (const char *addr);

/** \ingroup avr_pgmspace
    Read an <tt>unsigned char</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline unsigned char pgm_read_unsigned_char (const unsigned char *addr);

/** \ingroup avr_pgmspace
    Read a <tt>signed char</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline signed char pgm_read_signed_char (const signed char *addr);

/** \ingroup avr_pgmspace
    Read an <tt>uint8_t</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline uint8_t pgm_read_u8 (const uint8_t *addr);

/** \ingroup avr_pgmspace
    Read an <tt>int8_t</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline int8_t pgm_read_i8 (const int8_t *addr);

/** \ingroup avr_pgmspace
    Read a <tt>short</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline short pgm_read_short (const short *addr);

/** \ingroup avr_pgmspace
    Read an <tt>unsigned short</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline unsigned short pgm_read_unsigned_short (const unsigned short *addr);

/** \ingroup avr_pgmspace
    Read an <tt>uint16_t</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline uint16_t pgm_read_u16 (const uint16_t *addr);

/** \ingroup avr_pgmspace
    Read an <tt>int16_t</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline int16_t pgm_read_i16 (const int16_t *addr);

/** \ingroup avr_pgmspace
    Read an <tt>int</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline int pgm_read_int (const int *addr);

/** \ingroup avr_pgmspace
    Read a <tt>signed</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline signed pgm_read_signed (const signed *addr);

/** \ingroup avr_pgmspace
    Read an <tt>unsigned</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline unsigned pgm_read_unsigned (const unsigned *addr);

/** \ingroup avr_pgmspace
    Read a <tt>signed int</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline signed int pgm_read_signed_int (const signed int *addr);

/** \ingroup avr_pgmspace
    Read an <tt>unsigned int</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline unsigned int pgm_read_unsigned_int (const unsigned int *addr);

/** \ingroup avr_pgmspace
    Read an \c #int24_t from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline int24_t pgm_read_i24 (const int24_t *addr);

/** \ingroup avr_pgmspace
    Read an \c #uint24_t from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline uint24_t pgm_read_u24 (const uint24_t *addr);

/** \ingroup avr_pgmspace
    Read an <tt>uint32_t</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline uint32_t pgm_read_u32 (const uint32_t *addr);

/** \ingroup avr_pgmspace
    Read an <tt>int32_t</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline int32_t pgm_read_i32 (const int32_t *addr);

/** \ingroup avr_pgmspace
    Read a <tt>long</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline long pgm_read_long (const long *addr);

/** \ingroup avr_pgmspace
    Read an <tt>unsigned long</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline unsigned long pgm_read_unsigned_long (const unsigned long *addr);

/** \ingroup avr_pgmspace
    Read a <tt>long long</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline long long pgm_read_long_long (const long long *addr);

/** \ingroup avr_pgmspace
    Read an <tt>unsigned long long</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline unsigned long long pgm_read_unsigned_long_long (const unsigned long long *addr);

/** \ingroup avr_pgmspace
    Read an <tt>uint64_t</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline uint64_t pgm_read_u64 (const uint64_t *addr);

/** \ingroup avr_pgmspace
    Read an <tt>int64_t</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline int64_t pgm_read_i64 (const int64_t *addr);

/** \ingroup avr_pgmspace
    Read a <tt>float</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory. */
static inline float pgm_read_float (const float *addr);

/** \ingroup avr_pgmspace
    Read a <tt>double</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline double pgm_read_double (const double *addr);

/** \ingroup avr_pgmspace
    Read a <tt>long double</tt> from 16-bit address \p addr.
    The address is in the lower 64 KiB of program memory.
    \since AVR-LibC v2.2 */
static inline long double pgm_read_long_double (const long double *addr);

#else /* !DOXYGEN */

#include <bits/def-pgm-read.h>

_Avrlibc_Def_Pgm_1 (char, char)
_Avrlibc_Def_Pgm_1 (unsigned_char, unsigned char)
_Avrlibc_Def_Pgm_1 (signed_char, signed char)
_Avrlibc_Def_Pgm_1 (u8, uint8_t)
_Avrlibc_Def_Pgm_1 (i8, int8_t)
#if __SIZEOF_INT__ == 1
_Avrlibc_Def_Pgm_1 (int, int)
_Avrlibc_Def_Pgm_1 (signed, signed)
_Avrlibc_Def_Pgm_1 (unsigned, unsigned)
_Avrlibc_Def_Pgm_1 (signed_int, signed int)
_Avrlibc_Def_Pgm_1 (unsigned_int, unsigned int)
#endif
#if __SIZEOF_SHORT__ == 1
_Avrlibc_Def_Pgm_1 (short, short)
_Avrlibc_Def_Pgm_1 (unsigned_short, unsigned short)
#endif

_Avrlibc_Def_Pgm_2 (u16, uint16_t)
_Avrlibc_Def_Pgm_2 (i16, int16_t)
#if __SIZEOF_INT__ == 2
_Avrlibc_Def_Pgm_2 (int, int)
_Avrlibc_Def_Pgm_2 (signed, signed)
_Avrlibc_Def_Pgm_2 (unsigned, unsigned)
_Avrlibc_Def_Pgm_2 (signed_int, signed int)
_Avrlibc_Def_Pgm_2 (unsigned_int, unsigned int)
#endif
#if __SIZEOF_SHORT__ == 2
_Avrlibc_Def_Pgm_2 (short, short)
_Avrlibc_Def_Pgm_2 (unsigned_short, unsigned short)
#endif
#if __SIZEOF_LONG__ == 2
_Avrlibc_Def_Pgm_2 (long, long)
_Avrlibc_Def_Pgm_2 (unsigned_long, unsigned long)
#endif

#if defined(__INT24_MAX__)
_Avrlibc_Def_Pgm_3 (i24, int24_t)
_Avrlibc_Def_Pgm_3 (u24, uint24_t)
#endif /* Have __int24 */

_Avrlibc_Def_Pgm_4 (u32, uint32_t)
_Avrlibc_Def_Pgm_4 (i32, int32_t)
_Avrlibc_Def_Pgm_4 (float, float)
#if __SIZEOF_LONG__ == 4
_Avrlibc_Def_Pgm_4 (long, long)
_Avrlibc_Def_Pgm_4 (unsigned_long, unsigned long)
#endif
#if __SIZEOF_LONG_LONG__ == 4
_Avrlibc_Def_Pgm_4 (long_long, long long)
_Avrlibc_Def_Pgm_4 (unsigned_long_long, unsigned long long)
#endif
#if __SIZEOF_DOUBLE__ == 4
_Avrlibc_Def_Pgm_4 (double, double)
#endif
#if __SIZEOF_LONG_DOUBLE__ == 4
_Avrlibc_Def_Pgm_4 (long_double, long double)
#endif

#if __SIZEOF_LONG_LONG__ == 8
_Avrlibc_Def_Pgm_8 (u64, uint64_t)
_Avrlibc_Def_Pgm_8 (i64, int64_t)
_Avrlibc_Def_Pgm_8 (long_long, long long)
_Avrlibc_Def_Pgm_8 (unsigned_long_long, unsigned long long)
#endif
#if __SIZEOF_DOUBLE__ == 8
_Avrlibc_Def_Pgm_8 (double, double)
#endif
#if __SIZEOF_LONG_DOUBLE__ == 8
_Avrlibc_Def_Pgm_8 (long_double, long double)
#endif

#endif /* DOXYGEN */

#ifdef __DOXYGEN__

/** \name Functions reading from PROGMEM_FAR */

/** \ingroup avr_pgmspace
    Read a <tt>char</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline char pgm_read_char_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>unsigned char</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline unsigned char pgm_read_unsigned_char_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read a <tt>signed char</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline signed char pgm_read_signed_char_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>uint8_t</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline uint8_t pgm_read_u8_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>int8_t</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline int8_t pgm_read_i8_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read a <tt>short</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline short pgm_read_short_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>unsigned short</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline unsigned short pgm_read_unsigned_short_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>uint16_t</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline uint16_t pgm_read_u16_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>int16_t</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline int16_t pgm_read_i16_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>int</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline int pgm_read_int_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>unsigned</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline unsigned pgm_read_unsigned_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>unsigned int</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline unsigned int pgm_read_unsigned_int_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read a <tt>signed</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline signed pgm_read_signed_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read a <tt>signed int</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline signed int pgm_read_signed_int_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read a <tt>long</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline long pgm_read_long_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>unsigned long</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline unsigned long pgm_read_unsigned_long_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an \c #int24_t from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline int24_t pgm_read_i24_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an \c #uint24_t from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline uint24_t pgm_read_u24_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>uint32_t</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline uint32_t pgm_read_u32_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>int32_t</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline int32_t pgm_read_i32_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read a <tt>long long</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline long long pgm_read_long_long_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>unsigned long long</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline unsigned long long pgm_read_unsigned_long_long_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>uint64_t</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline uint64_t pgm_read_u64_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read an <tt>int64_t</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline int64_t pgm_read_i64_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read a <tt>float</tt> from far address \p addr.
    The address is in the program memory. */
static inline float pgm_read_float_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read a <tt>double</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline double pgm_read_double_far (uint_farptr_t addr);

/** \ingroup avr_pgmspace
    Read a <tt>long double</tt> from far address \p addr.
    The address is in the program memory.
    \since AVR-LibC v2.2 */
static inline long double pgm_read_long_double_far (uint_farptr_t addr);

#else /* !DOXYGEN */

#include <bits/def-pgm-read-far.h>

_Avrlibc_Def_Pgm_Far_1 (char, char)
_Avrlibc_Def_Pgm_Far_1 (unsigned_char, unsigned char)
_Avrlibc_Def_Pgm_Far_1 (signed_char, signed char)
_Avrlibc_Def_Pgm_Far_1 (u8, uint8_t)
_Avrlibc_Def_Pgm_Far_1 (i8, int8_t)
#if __SIZEOF_INT__ == 1
_Avrlibc_Def_Pgm_Far_1 (int, int)
_Avrlibc_Def_Pgm_Far_1 (unsigned, unsigned)
_Avrlibc_Def_Pgm_Far_1 (unsigned_int, unsigned int)
_Avrlibc_Def_Pgm_Far_1 (signed, signed)
_Avrlibc_Def_Pgm_Far_1 (signed_int, signed int)
#endif
#if __SIZEOF_SHORT__ == 1
_Avrlibc_Def_Pgm_Far_1 (short, short)
_Avrlibc_Def_Pgm_Far_1 (unsigned_short, unsigned short)
#endif

_Avrlibc_Def_Pgm_Far_2 (u16, uint16_t)
_Avrlibc_Def_Pgm_Far_2 (i16, int16_t)
#if __SIZEOF_INT__ == 2
_Avrlibc_Def_Pgm_Far_2 (int, int)
_Avrlibc_Def_Pgm_Far_2 (unsigned, unsigned)
_Avrlibc_Def_Pgm_Far_2 (unsigned_int, unsigned int)
_Avrlibc_Def_Pgm_Far_2 (signed, signed)
_Avrlibc_Def_Pgm_Far_2 (signed_int, signed int)
#endif
#if __SIZEOF_SHORT__ == 2
_Avrlibc_Def_Pgm_Far_2 (short, short)
_Avrlibc_Def_Pgm_Far_2 (unsigned_short, unsigned short)
#endif
#if __SIZEOF_LONG__ == 2
_Avrlibc_Def_Pgm_Far_2 (long, long)
_Avrlibc_Def_Pgm_Far_2 (unsigned_long, unsigned long)
#endif

#if defined(__INT24_MAX__)
_Avrlibc_Def_Pgm_Far_3 (i24, int24_t)
_Avrlibc_Def_Pgm_Far_3 (u24, uint24_t)
#endif /* Have __int24 */

_Avrlibc_Def_Pgm_Far_4 (u32, uint32_t)
_Avrlibc_Def_Pgm_Far_4 (i32, int32_t)
_Avrlibc_Def_Pgm_Far_4 (float, float)
#if __SIZEOF_LONG__ == 4
_Avrlibc_Def_Pgm_Far_4 (long, long)
_Avrlibc_Def_Pgm_Far_4 (unsigned_long, unsigned long)
#endif
#if __SIZEOF_LONG_LONG__ == 4
_Avrlibc_Def_Pgm_Far_4 (long_long, long long)
_Avrlibc_Def_Pgm_Far_4 (unsigned_long_long, unsigned long long)
#endif
#if __SIZEOF_DOUBLE__ == 4
_Avrlibc_Def_Pgm_Far_4 (double, double)
#endif
#if __SIZEOF_LONG_DOUBLE__ == 4
_Avrlibc_Def_Pgm_Far_4 (long_double, long double)
#endif

#if __SIZEOF_LONG_LONG__ == 8
_Avrlibc_Def_Pgm_Far_8 (u64, uint64_t)
_Avrlibc_Def_Pgm_Far_8 (i64, int64_t)
_Avrlibc_Def_Pgm_Far_8 (long_long, long long)
_Avrlibc_Def_Pgm_Far_8 (unsigned_long_long, unsigned long long)
#endif
#if __SIZEOF_DOUBLE__ == 8
_Avrlibc_Def_Pgm_Far_8 (double, double)
#endif
#if __SIZEOF_LONG_DOUBLE__ == 8
_Avrlibc_Def_Pgm_Far_8 (long_double, long double)
#endif

#endif /* DOXYGEN */

#ifdef __cplusplus
extern "C" {
#endif

#if defined(__DOXYGEN__)
/* No documentation for the deprecated stuff.  */
#elif defined(__PROG_TYPES_COMPAT__)  /* !DOXYGEN */

typedef void prog_void __attribute__((__progmem__,__deprecated__("prog_void type is deprecated.")));
typedef char prog_char __attribute__((__progmem__,__deprecated__("prog_char type is deprecated.")));
typedef unsigned char prog_uchar __attribute__((__progmem__,__deprecated__("prog_uchar type is deprecated.")));
typedef int8_t    prog_int8_t   __attribute__((__progmem__,__deprecated__("prog_int8_t type is deprecated.")));
typedef uint8_t   prog_uint8_t  __attribute__((__progmem__,__deprecated__("prog_uint8_t type is deprecated.")));
typedef int16_t   prog_int16_t  __attribute__((__progmem__,__deprecated__("prog_int16_t type is deprecated.")));
typedef uint16_t  prog_uint16_t __attribute__((__progmem__,__deprecated__("prog_uint16_t type is deprecated.")));
typedef int32_t   prog_int32_t  __attribute__((__progmem__,__deprecated__("prog_int32_t type is deprecated.")));
typedef uint32_t  prog_uint32_t __attribute__((__progmem__,__deprecated__("prog_uint32_t type is deprecated.")));
#if !__USING_MINT8
typedef int64_t   prog_int64_t  __attribute__((__progmem__,__deprecated__("prog_int64_t type is deprecated.")));
typedef uint64_t  prog_uint64_t __attribute__((__progmem__,__deprecated__("prog_uint64_t type is deprecated.")));
#endif

#ifndef PGM_P
#define PGM_P const prog_char *
#endif

#ifndef PGM_VOID_P
#define PGM_VOID_P const prog_void *
#endif

#else /* !defined(__DOXYGEN__), !defined(__PROG_TYPES_COMPAT__) */

#ifndef PGM_P
#define PGM_P const char *
#endif

#ifndef PGM_VOID_P
#define PGM_VOID_P const void *
#endif
#endif /* defined(__DOXYGEN__), defined(__PROG_TYPES_COMPAT__) */

/* Although in C, we can get away with just using __c, it does not work in
   C++. We need to use &__c[0] to avoid the compiler puking. Dave Hylands
   explained it thusly,

     Let's suppose that we use PSTR("Test"). In this case, the type returned
     by __c is a prog_char[5] and not a prog_char *. While these are
     compatible, they aren't the same thing (especially in C++). The type
     returned by &__c[0] is a prog_char *, which explains why it works
     fine. */

#if defined(__DOXYGEN__)

/** \name Macros */

/*
 * The #define below is just a dummy that serves documentation
 * purposes only.
 */
/** \ingroup avr_pgmspace
    \def PSTR(str)

    Used to declare a static pointer to a string in program space. */
# define PSTR(str) ({ static const PROGMEM char c[] = (str); &c[0]; })
#else  /* !DOXYGEN */
/* The real thing. */
# define PSTR(s) (__extension__({static const char __c[] PROGMEM = (s); &__c[0];}))
#endif /* DOXYGEN */

#if defined(__DOXYGEN__)
/** \ingroup avr_pgmspace
    \def PSTR_FAR(str)

    Used to define a string literal in far program space, and to return its
    address of type #uint_farptr_t.
    \since AVR-LibC v2.2 */
# define PSTR_FAR(str) ({ static const PROGMEM_FAR char c[] = (str); pgm_get_far_address(c[0]); })
#else  /* !DOXYGEN */
/* The real thing. */
# define PSTR_FAR(s) (__extension__({static const char __c[] PROGMEM_FAR = (s); pgm_get_far_address(__c[0]);}))
#endif /* DOXYGEN */

#ifndef __DOXYGEN__

/* These are used down the line for pgm_read_byte[_near] etc. */

#if defined (__AVR_TINY__)
/* Attribute __progmem__ on Reduced Tiny works different than for
   all the other devices:  When taking the address of a symbol that's
   attributed as progmem, then the compiler adds an offset of 0x4000
   to the value of the symbol.  This means that accessing data in
   progmem can be performed by vanilla C/C++ code.  This requires
   - GCC PR71948 - Make progmem work on Reduced Tiny (GCC v7 / 2016-08)  */
#define __LPM(addr)         (* (const uint8_t*)(addr))
#define __LPM_word(addr)    (* (const uint16_t*)(addr))
#define __LPM_dword(addr)   (* (const uint32_t*)(addr))
#  if __SIZEOF_LONG_LONG__ == 8
#  define __LPM_qword(addr)   (* (const uint64_t*)(addr))
#  endif
#else
#define __LPM(addr)                             \
  (__extension__({                              \
      uint16_t __addr16 = (uint16_t) (addr);    \
      uint8_t __result;                         \
      __LPM__1 (__result, __addr16);            \
      __result;                                 \
}))

#define __LPM_word(addr)                        \
  (__extension__({                              \
      uint16_t __addr16 = (uint16_t) (addr);    \
      uint16_t __result;                        \
      __LPM__2 (__result, __addr16);            \
      __result;                                 \
}))

#define __LPM_dword(addr)                       \
  (__extension__({                              \
      uint16_t __addr16 = (uint16_t) (addr);    \
      uint32_t __result;                        \
      __LPM__4 (__result, __addr16);            \
      __result;                                 \
}))

#if __SIZEOF_LONG_LONG__ == 8
#define __LPM_qword(addr)                       \
  (__extension__({                              \
      uint16_t __addr16 = (uint16_t) (addr);    \
      uint64_t __result;                        \
      __LPM__8 (__result, __addr16);            \
      __result;                                 \
}))
#endif
#endif /* AVR_TINY */


#define __ELPM(addr)                                    \
  (__extension__({                                      \
      uint_farptr_t __addr32 = (addr);                  \
      uint8_t __result;                                 \
      __ELPM__1 (__result, __addr32, uint8_t);          \
      __result;                                         \
}))

#define __ELPM_word(addr)                               \
  (__extension__({                                      \
      uint_farptr_t __addr32 = (addr);                  \
      uint16_t __result;                                \
      __ELPM__2 (__result, __addr32, uint16_t);         \
      __result;                                         \
}))

#define __ELPM_dword(addr)                              \
  (__extension__({                                      \
      uint_farptr_t __addr32 = (addr);                  \
      uint32_t __result;                                \
      __ELPM__4 (__result, __addr32, uint32_t);         \
      __result;                                         \
}))

#if __SIZEOF_LONG_LONG__ == 8
#define __ELPM_qword(addr)                              \
  (__extension__({                                      \
      uint_farptr_t __addr32 = (addr);                  \
      uint64_t __result;                                \
      __ELPM__8 (__result, __addr32, uint64_t);         \
      __result;                                         \
}))
#endif

#endif  /* !__DOXYGEN__ */

/** \name Macros reading from PROGMEM */

/** \ingroup avr_pgmspace
    \def pgm_read_byte_near(__addr)
    Read a byte from the program space with a 16-bit address. */
#define pgm_read_byte_near(__addr) __LPM ((uint16_t)(__addr))

/** \ingroup avr_pgmspace
    \def pgm_read_word_near(__addr)
    Read a word from the program space with a 16-bit address. */
#define pgm_read_word_near(__addr) __LPM_word ((uint16_t)(__addr))

/** \ingroup avr_pgmspace
    \def pgm_read_dword_near(__addr)
    Read a double word from the program space with a 16-bit address.  */
#define pgm_read_dword_near(__addr) \
    __LPM_dword ((uint16_t)(__addr))

/** \ingroup avr_pgmspace
    \def pgm_read_qword_near(__addr)
    Read a quad-word from the program space with a 16-bit address.
    \since AVR-LibC v2.2  */
#define pgm_read_qword_near(__addr) __LPM_qword ((uint16_t)(__addr))

/** \ingroup avr_pgmspace
    \def pgm_read_float_near (const float *address)
    Read a \c float from the program space with a 16-bit address.*/
#define pgm_read_float_near(addr)  pgm_read_float (addr)

/** \ingroup avr_pgmspace
    \def pgm_read_ptr_near(__addr)
    Read a pointer from the program space with a 16-bit address. */
#define pgm_read_ptr_near(__addr) \
    ((void*) __LPM_word ((uint16_t)(__addr)))

/** \name Macros reading from PROGMEM_FAR */

/** \ingroup avr_pgmspace
    \def pgm_read_byte_far(__addr)
    Read a byte from the program space with a 32-bit (far) address. */
#define pgm_read_byte_far(__addr)  __ELPM (__addr)

/** \ingroup avr_pgmspace
    \def pgm_read_word_far(__addr)
    Read a word from the program space with a 32-bit (far) address. */
#define pgm_read_word_far(__addr)  __ELPM_word (__addr)

/** \ingroup avr_pgmspace
    \def pgm_read_dword_far(__addr)
    Read a double word from the program space with a 32-bit (far) address. */
#define pgm_read_dword_far(__addr) __ELPM_dword (__addr)

/** \ingroup avr_pgmspace
    \def pgm_read_qword_far(__addr)
    Read a quad-word from the program space with a 32-bit (far) address.
    \since AVR-LibC v2.2 */
#define pgm_read_qword_far(__addr) __ELPM_qword (__addr)

/** \ingroup avr_pgmspace
    \def pgm_read_ptr_far(__addr)
    Read a pointer from the program space with a 32-bit (far) address. */
#define pgm_read_ptr_far(__addr) ((void*) __ELPM_word (__addr))

/** \name Macros reading from PROGMEM */

/** \ingroup avr_pgmspace
    \def pgm_read_byte(__addr)
    Read a byte from the program space with a 16-bit address. */
#define pgm_read_byte(__addr)    pgm_read_byte_near(__addr)

/** \ingroup avr_pgmspace
    \def pgm_read_word(__addr)
    Read a word from the program space with a 16-bit address. */
#define pgm_read_word(__addr)    pgm_read_word_near(__addr)

/** \ingroup avr_pgmspace
    \def pgm_read_dword(__addr)
    Read a double word from the program space with a 16-bit address. */
#define pgm_read_dword(__addr)   pgm_read_dword_near(__addr)

/** \ingroup avr_pgmspace
    \def pgm_read_qword(__addr)
    Read a quad-word from the program space with a 16-bit address.
    \since AVR-LibC v2.2 */
#define pgm_read_qword(__addr)   pgm_read_qword_near(__addr)

/** \ingroup avr_pgmspace
    \def pgm_read_ptr(__addr)
    Read a pointer from the program space with a 16-bit address. */
#define pgm_read_ptr(__addr)     pgm_read_ptr_near(__addr)

/** \name Macros */

/** \ingroup avr_pgmspace
    \def pgm_get_far_address(var)

   This macro evaluates to a ::uint_farptr_t 32-bit "far" pointer (only
   24 bits used) to data even beyond the 64 KiB limit for the 16-bit ordinary
   pointer.  It is similar to the '&' operator, with some limitations.
   Example:
   \code
   #include <avr/pgmspace.h>

   // Section .progmemx.data is located after all the code sections.
   PROGMEM_FAR
   const int data[] = { 2, 3, 5, 7, 9, 11 };

   int get_data (uint8_t idx)
   {
       uint_farptr_t pdata = pgm_get_far_address (data[0]);
       return pgm_read_int_far (pdata + idx * sizeof(int));
   }
   \endcode

   Comments:

   - The overhead is minimal and it's mainly due to the 32-bit size operation.

   - 24 bit sizes guarantees the code compatibility for use in future devices.

   - \p var has to be resolved at link-time as an existing symbol,
     i.e. a simple variable name, an array name, or an array or structure
     element provided the offset is known at compile-time, and \p var is
     located in static storage, etc.
*/
#ifdef __DOXYGEN__
#define pgm_get_far_address(var)
#else
#ifndef __AVR_TINY__
#define pgm_get_far_address(var)                      \
(__extension__({                                      \
    uint_farptr_t __tmp;                              \
                                                      \
    __asm__ (                                         \
        "ldi    %A0, lo8(%1)"           "\n\t"        \
        "ldi    %B0, hi8(%1)"           "\n\t"        \
        "ldi    %C0, hh8(%1)"           "\n\t"        \
        "clr    %D0 ; [[len=nl]]"                     \
        :   "=d" (__tmp)                              \
        :   "i"  (&(var))                             \
    );                                                \
    __tmp;                                            \
}))
#else
/* The working of the pgm_read_far() functions and macros is such
   that they decay to pgm_read() for devices without ELPM.
   Since GCC v7 PR71948, the compiler adds an offset of 0x4000 on
   Reduced Tiny when it takes the address of an object in PROGMEM,
   which means we have to add 0x4000 here, too.  Notice that
   PROGMEM_FAR is just a section attribute without __progmem__, and
   therefore the compiler doesn't add 0x4000.  */
#define pgm_get_far_address(var)                      \
(__extension__({                                      \
    uint_farptr_t __tmp;                              \
                                                      \
    __asm__ (                                         \
        "ldi    %A0, lo8(0x4000+(%1))"  "\n\t"        \
        "ldi    %B0, hi8(0x4000+(%1))"  "\n\t"        \
        "ldi    %C0, hh8(0x4000+(%1))"  "\n\t"        \
        "clr    %D0 ; [[len=nl]]"                     \
        :   "=d" (__tmp)                              \
        :   "i"  (&(var))                             \
    );                                                \
    __tmp;                                            \
}))
#endif /* AVR TINY */
#endif /* DOXYGEN */

/** \name Functions with a PROGMEM argument
    Similar to the functions from <string.h>, but with one string
    argument located in the lower 64 KiB segment of program memory.<br>
    For similar functions with address-space #__flash,
    see \ref avr_flash "<avr/flash.h>" */

#ifdef __DOXYGEN__
/** \ingroup avr_pgmspace
    \fn size_t strlen_P(const char *src)

    The strlen_P() function is similar to strlen(), except that src is a
    pointer to a string in program space.

    \returns The strlen_P() function returns the number of characters in src.
*/
static inline size_t strlen_P(const char * s);
#endif

/** \ingroup avr_pgmspace
    \fn const void * memchr_P(const void *s, int val, size_t len)
    \brief Scan flash memory for a character.

    The memchr_P() function scans the first \p len bytes of the flash
    memory area pointed to by \p s for the character \p val.  The first
    byte to match \p val (interpreted as an unsigned character) stops
    the operation. \p s is located in the lower 64 KiB of program memory.

    \return The memchr_P() function returns a pointer to the matching
    byte or \c NULL if the character does not occur in the given memory
    area.	*/
extern const void * memchr_P(const void *, int __val, size_t __len) __ATTR_CONST__;

/** \ingroup avr_pgmspace
    \fn int memcmp_P(const void *s1, const void *s2, size_t len)
    \brief Compare memory areas

    The memcmp_P() function compares the first \p len bytes of the memory
    areas \p s1 and flash \p s2. The comparison is performed using unsigned
    char operations. \p s2 is located in the lower 64 KiB of program memory.

    \returns The memcmp_P() function returns an integer less than, equal
    to, or greater than zero if the first \p len bytes of \p s1 is found,
    respectively, to be less than, to match, or be greater than the first
    \p len bytes of \p s2.	*/
extern int memcmp_P(const void *, const void *, size_t) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn void *memccpy_P (void *dest, const void *src, int val, size_t len)

    This function is similar to memccpy() except that \p src points
    to a string in the lower 64 KiB of program space.	*/
extern void *memccpy_P(void *, const void *, int __val, size_t);

/** \ingroup avr_pgmspace
    \fn void *memcpy_P(void *dest, const void *src, size_t n)

    The memcpy_P() function is similar to memcpy(), except the src string
    resides in the lower 64 KiB of program space.

    \returns The memcpy_P() function returns a pointer to dest.  */
extern void *memcpy_P(void *, const void *, size_t);

/** \ingroup avr_pgmspace
    \fn void *memmem_P(const void *s1, size_t len1, const void *s2, size_t len2)

    The memmem_P() function is similar to memmem() except that \p s2 is
    pointer to a string in the lower 64 KiB of program space.	*/
extern void *memmem_P(const void *, size_t, const void *, size_t) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn const void *memrchr_P(const void *src, int val, size_t len)

    The memrchr_P() function is like the memchr_P() function, except
    that it searches backwards from the end of the \p len bytes pointed
    to by \p src instead of forwards from the front. (Glibc, GNU extension.)
    \p src is located in the lower 64 KiB of program memory.

    \return The memrchr_P() function returns a pointer to the matching
    byte or \c NULL if the character does not occur in the given memory
    area.	*/
extern const void * memrchr_P(const void *, int __val, size_t __len) __ATTR_CONST__;

/** \ingroup avr_pgmspace
    \fn char *strcat_P(char *dest, const char *src)

    The strcat_P() function is similar to strcat() except that the \e src
    string must be located in the lower 64 KiB of program space (flash).

    \returns The strcat() function returns a pointer to the resulting string
    \e dest. */
extern char *strcat_P(char *, const char *);

/** \ingroup avr_pgmspace
    \fn const char *strchr_P(const char *s, int val)
    \brief Locate character in program space string.

    The strchr_P() function locates the first occurrence of \p val
    (converted to a char) in the string pointed to by \p s in the lower
    64 KiB of program space. The terminating null character is considered
    to be part of the string.

    The strchr_P() function is similar to strchr() except that \p s
    points to a string in the lower 64 KiB of program space.

    \returns The strchr_P() function returns a pointer to the matched
    character or \c NULL if the character is not found. */
#ifdef __DOXYGEN__
extern const char * strchr_P(const char *, int __val) __ATTR_CONST__;
#else
/* strchr_P is used in variants of printf, so we model its GPR footprint.  */
extern __ATTR_ALWAYS_INLINE__ __ATTR_GNU_INLINE__
const char * strchr_P(const char *__hay, int __val)
{
  register const char *__r24 __asm("24") = __hay;
  register int __r22 __asm("22") = __val;
  __asm ("%~call strchr_P ; [[len=%~call]]"
         : "+r" (__r24) : "r" (__r22) : "30", "31");
  return __r24;
}
#endif /* DOXYGEN */

/** \ingroup avr_pgmspace
    \fn const char *strchrnul_P(const char *s, int c)

    The strchrnul_P() function is like strchr_P() except that if \p c is
    not found in \p s, then it returns a pointer to the null byte at the
    end of \p s, rather than \c NULL. (Glibc, GNU extension.)

    \return The strchrnul_P() function returns a pointer to the matched
    character, or a pointer to the null byte at the end of \p s (i.e.,
    \c s+strlen(s)) if the character is not found.	*/
extern const char * strchrnul_P(const char *, int __val) __ATTR_CONST__;

/** \ingroup avr_pgmspace
    \fn int strcmp_P(const char *s1, const char *s2)

    The strcmp_P() function is similar to strcmp() except that \p s2 is
    pointer to a string in the lower 64 KiB of program space.

    \returns The strcmp_P() function returns an integer less than, equal
    to, or greater than zero if \p s1 is found, respectively, to be less
    than, to match, or be greater than \p s2. A consequence of the
    ordering used by strcmp_P() is that if \p s1 is an initial substring
    of \p s2, then \p s1 is considered to be "less than" \p s2. */
extern int strcmp_P(const char *, const char *) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn char *strcpy_P(char *dest, const char *src)

    The strcpy_P() function is similar to strcpy() except that \p src
    points to a string in the lower 64 KiB of program space.

    \returns The strcpy_P() function returns a pointer to the destination
    string dest. */
#ifdef __DOXYGEN__
extern inline char *strcpy_P(char *, const char *);
#endif

/** \ingroup avr_pgmspace
    \fn char *stpcpy_P(char *dest, const char *src)

    The stpcpy_P() function is similar to stpcpy() except that \p src
    points to a string in the lower 64 KiB of program space.

    \returns The stpcpy_P() function returns a pointer to the
    terminating '\\0' character of destination string \p dest.

    \since AVR-LibC 2.3   */
extern char *stpcpy_P(char *, const char *);

/** \ingroup avr_pgmspace
    \fn int strcasecmp_P(const char *s1, const char *s2)
    \brief Compare two strings ignoring case.

    The strcasecmp_P() function compares the two strings \p s1 and \p s2,
    ignoring the case of the characters.

    \param s1 A pointer to a string in the device's SRAM.
    \param s2 A pointer to a string in the lower 64 KiB of the device's Flash.

    \returns The strcasecmp_P() function returns an integer less than,
    equal to, or greater than zero if \p s1 is found, respectively, to
    be less than, to match, or be greater than \p s2. A consequence of
    the ordering used by strcasecmp_P() is that if \p s1 is an initial
    substring of \p s2, then \p s1 is considered to be "less than" \p s2. */
extern int strcasecmp_P(const char *, const char *) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn char *strcasestr_P(const char *s1, const char *s2)

    This function is similar to strcasestr() except that \p s2 points
    to a string in the lower 64 KiB of program space.	*/
extern char *strcasestr_P(const char *, const char *) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn size_t strcspn_P(const char *s, const char *reject)

    The strcspn_P() function calculates the length of the initial segment
    of \p s which consists entirely of characters not in \p reject. This
    function is similar to strcspn() except that \p reject points
    to a string in the lower 64 KiB of program space.

    \return The strcspn_P() function returns the number of characters in
    the initial segment of \p s which are not in the string \p reject.
    The terminating zero is not considered as a part of string.	*/
extern size_t strcspn_P(const char *__s, const char * __reject) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn size_t strlcat_P(char *dst, const char *src, size_t siz)
    \brief Concatenate two strings.

    The strlcat_P() function is similar to strlcat(), except that the \p src
    string must be located in the lower 64 KiB of program space (flash).

    Appends \p src to string \p dst of size \p siz (unlike strncat(),
    \p siz is the full size of \p dst, not space left).  At most \p siz-1
    characters will be copied.  Always NULL terminates (unless \p siz <=
    \p strlen(dst)).

    \returns The strlcat_P() function returns strlen(src) + MIN(siz,
    strlen(initial dst)).  If retval >= siz, truncation occurred.	*/
extern size_t strlcat_P (char *, const char *, size_t );

/** \ingroup avr_pgmspace
    \fn size_t strlcpy_P(char *dst, const char *src, size_t siz)
    \brief Copy a string from progmem to RAM.

    Copy \p src to string \p dst of size \p siz.  At most \p siz-1
    characters will be copied.  Always NULL terminates (unless \p siz == 0).
    The strlcpy_P() function is similar to strlcpy() except that
    \p src points to a string in the lower 64 KiB of program memory.

    \returns The strlcpy_P() function returns strlen(src). If
    retval >= siz, truncation occurred.  */
extern size_t strlcpy_P (char *, const char *, size_t );

/** \ingroup avr_pgmspace
    \fn size_t strnlen_P(const char *src, size_t len)
    \brief Determine the length of a fixed-size string.

    The strnlen_P() function is similar to strnlen(), except that \c src
    points to a string in the lower 64 KiB of program space.

    \returns The strnlen_P function returns strlen_P(src), if that is less than
    \c len, or \c len if there is no '\\0' character among the first \c len
    characters pointed to by \c src. */
extern size_t strnlen_P(const char *, size_t) __ATTR_CONST__; /* program memory can't change */

/** \ingroup avr_pgmspace
    \fn int strncmp_P(const char *s1, const char *s2, size_t n)

    The strncmp_P() function is similar to strcmp_P() except it only compares
    the first (at most) n characters of s1 and s2.
    \p s2 is located in the lower 64 KiB of program memory.

    \returns The strncmp_P() function returns an integer less than, equal to,
    or greater than zero if s1 (or the first n bytes thereof) is found,
    respectively, to be less than, to match, or be greater than s2.  */
extern int strncmp_P(const char *, const char *, size_t) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn int strncasecmp_P(const char *s1, const char *s2, size_t n)
    \brief Compare two strings ignoring case.

    The strncasecmp_P() function is similar to strcasecmp_P(), except it
    only compares the first \p n characters of \p s1.

    \param s1 A pointer to a string in the device's SRAM.
    \param s2 A pointer to a string in the thwer 64 KiB of the device's Flash.
    \param n The maximum number of bytes to compare.

    \returns The strncasecmp_P() function returns an integer less than,
    equal to, or greater than zero if \p s1 (or the first \p n bytes
    thereof) is found, respectively, to be less than, to match, or be
    greater than \p s2. A consequence of the ordering used by
    strncasecmp_P() is that if \p s1 is an initial substring of \p s2,
    then \p s1 is considered to be "less than" \p s2.  */
extern int strncasecmp_P(const char *, const char *, size_t) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn char *strncat_P(char *dest, const char *src, size_t len)
    \brief Concatenate two strings.

    The strncat_P() function is similar to strncat(), except that the \p src
    string must be located in the lower 64 KiB of program space (flash).

    \returns The strncat_P() function returns a pointer to the resulting string
    \p dest.  */
extern char *strncat_P(char *, const char *, size_t);

/** \ingroup avr_pgmspace
    \fn char *strncpy_P(char *dest, const char *src, size_t n)

    The strncpy_P() function is similar to strcpy_P() except that not more
    than n bytes of src are copied.  Thus, if there is no null byte among the
    first n bytes of src, the result will not be null-terminated.
    \p src is located in the lower 64 KiB of program memory.

    In the case where the length of src is less than that of n, the remainder
    of dest will be padded with nulls.

    \returns The strncpy_P() function returns a pointer to the destination
    string \p dest.  */
extern char *strncpy_P(char *, const char *, size_t);

/** \ingroup avr_pgmspace
    \fn char *strpbrk_P(const char *s, const char *accept)

    The strpbrk_P() function locates the first occurrence in the string
    \p s of any of the characters in the flash string \p accept. This
    function is similar to strpbrk() except that \p accept points
    to a string in the lower 64 KiB of program space.

    \return  The strpbrk_P() function returns a pointer to the character
    in \p s that matches one of the characters in \p accept, or \c NULL
    if no such character is found. The terminating zero is not considered
    as a part of string: if one or both args are empty, the result will
    \c NULL. */
extern char *strpbrk_P(const char *__s, const char * __accept) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn const char *strrchr_P(const char *s, int val)
    \brief Locate character in string.

    The strrchr_P() function returns a pointer to the last occurrence of
    the character \p val in the string \p s.
    \p s is located in the lower 64 KiB of program memory.

    \return The strrchr_P() function returns a pointer to the matched
    character or \c NULL if the character is not found. */
extern const char * strrchr_P(const char *, int __val) __ATTR_CONST__;

/** \ingroup avr_pgmspace
    \fn char *strsep_P(char **sp, const char *delim)
    \brief Parse a string into tokens.

    The strsep_P() function locates, in the string referenced by \p *sp,
    the first occurrence of any character in the string \p delim (or the
    terminating '\\0' character) and replaces it with a '\\0'.  The
    location of the next character after the delimiter character (or \c
    NULL, if the end of the string was reached) is stored in \p *sp. An
    ``empty'' field, i.e. one caused by two adjacent delimiter
    characters, can be detected by comparing the location referenced by
    the pointer returned in \p *sp to '\\0'. This function is similar to
    strsep() except that \p delim points to a string in the lower
    64 KiB of program space.

    \return The strsep_P() function returns a pointer to the original
    value of \p *sp. If \p *sp is initially \c NULL, strsep_P() returns
    \c NULL. */
extern char *strsep_P(char **__sp, const char * __delim);

/** \ingroup avr_pgmspace
    \fn size_t strspn_P(const char *s, const char *accept)

    The strspn_P() function calculates the length of the initial segment
    of \p s which consists entirely of characters in \p accept. This
    function is similar to strspn() except that \p accept points
    to a string in the lower 64 KiB of program space.

    \return  The strspn_P() function returns the number of characters in
    the initial segment of \p s which consist only of characters from \p
    accept. The terminating zero is not considered as a part of string.	*/
extern size_t strspn_P(const char *__s, const char * __accept) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn char *strstr_P(const char *s1, const char *s2)
    \brief Locate a substring.

    The strstr_P() function finds the first occurrence of the substring
    \p s2 in the string \p s1.  The terminating '\\0' characters are not
    compared. The strstr_P() function is similar to strstr() except that
    \p s2 points to a string in the lower 64 KiB of program space.

    \returns The strstr_P() function returns a pointer to the beginning
    of the substring, or NULL if the substring is not found. If \p s2
    points to a string of zero length, the function returns \p s1. */
extern char *strstr_P(const char *, const char *) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn char *strtok_P(char *s, const char * delim)
    \brief Parses the string into tokens.

    strtok_P() parses the string \p s into tokens. The first call to
    strtok_P() should have \p s as its first argument. Subsequent calls
    should have the first argument set to NULL. If a token ends with a
    delimiter, this delimiting character is overwritten with a '\\0' and a
    pointer to the next character is saved for the next call to strtok_P().
    The delimiter string \p delim may be different for each call.

    The strtok_P() function is similar to strtok() except that \p delim
    points to a string in the lower 64 KiB of program space.

    \returns The strtok_P() function returns a pointer to the next token or
    NULL when no more tokens are found.

    \note strtok_P() is NOT reentrant. For a reentrant version of this
    function see strtok_rP().
 */
extern char *strtok_P(char *__s, const char * __delim);

/** \ingroup avr_pgmspace
    \fn char *strtok_rP (char *string, const char *delim, char **last)
    \brief Parses string into tokens.

    The strtok_rP() function parses \p string into tokens. The first call to
    strtok_rP() should have string as its first argument. Subsequent calls
    should have the first argument set to NULL. If a token ends with a
    delimiter, this delimiting character is overwritten with a '\\0' and a
    pointer to the next character is saved for the next call to strtok_rP().
    The delimiter string \p delim may be different for each call. \p last is
    a user allocated char* pointer. It must be the same while parsing the
    same string. strtok_rP() is a reentrant version of strtok_P().

    The strtok_rP() function is similar to strtok_r() except that \p delim
    points to a string in the lower 64 KiB of program space.

    \returns The strtok_rP() function returns a pointer to the next token or
    NULL when no more tokens are found. */
extern char *strtok_rP(char *__s, const char * __delim, char **__last);

/** \name Functions with a PROGMEM_FAR argument
    Similar to the functions from <string.h>, but with one
    string argument located in program memory.<br>
    For similar functions with address-space #__flashx,
    see \ref avr_flash "<avr/flash.h>" */

/** \ingroup avr_pgmspace
    \fn size_t strlen_PF(uint_farptr_t s)
    \brief Obtain the length of a string

    The strlen_PF() function is similar to strlen(), except that \e s is a
    far pointer to a string in program space.

    \param s A far pointer to the string in flash

    \returns The strlen_PF() function returns the number of characters in
    \e s. */
extern size_t strlen_PF(uint_farptr_t src) __ATTR_CONST__; /* program memory can't change */

/** \ingroup avr_pgmspace
    \fn size_t strnlen_PF(uint_farptr_t s, size_t len)
    \brief Determine the length of a fixed-size string

    The strnlen_PF() function is similar to strnlen(), except that \e s is a
    far pointer to a string in program space.

    \param s A far pointer to the string in Flash
    \param len The maximum number of length to return

    \returns The strnlen_PF function returns strlen_PF(\e s), if that is less
    than \e len, or \e len if there is no '\\0' character among the first \e
    len characters pointed to by \e s. */
extern size_t strnlen_PF(uint_farptr_t src, size_t len) __ATTR_CONST__; /* program memory can't change */

/** \ingroup avr_pgmspace
    \fn void *memcpy_PF(void *dest, uint_farptr_t src, size_t n)
    \brief Copy a memory block from flash to SRAM

    The memcpy_PF() function is similar to memcpy(), except the data
    is copied from the program space and is addressed using a far pointer.

    \param dest A pointer to the destination buffer
    \param src A far pointer to the origin of data in flash memory
    \param n The number of bytes to be copied

    \returns The memcpy_PF() function returns a pointer to \e dst. */
extern void *memcpy_PF(void *dest, uint_farptr_t src, size_t len);

/** \ingroup avr_pgmspace
    \fn char *strcpy_PF(char *dst, uint_farptr_t src)
    \brief Duplicate a string

    The strcpy_PF() function is similar to strcpy() except that \e src is a far
    pointer to a string in program space.

    \param dst A pointer to the destination string in SRAM
    \param src A far pointer to the source string in Flash

    \returns The strcpy_PF() function returns a pointer to the destination
    string \e dst. */
extern char *strcpy_PF(char *dest, uint_farptr_t src);

/** \ingroup avr_pgmspace
    \fn char *stpcpy_PF(char *dst, uint_farptr_t src)
    \brief Duplicate a string

    The stpcpy_PF() function is similar to stpcpy() except that \e src
    is a far pointer to a string in program space.

    \param dst A pointer to the destination string in SRAM
    \param src A far pointer to the source string in Flash

    \returns The stpcpy_PF() function returns a pointer to the
    terminating '\\0' character of the destination string \e dst.

    \since AVR-LibC 2.3  */
extern char *stpcpy_PF(char *dest, uint_farptr_t src);

/** \ingroup avr_pgmspace
    \fn char *strncpy_PF(char *dst, uint_farptr_t src, size_t n)
    \brief Duplicate a string until a limited length

    The strncpy_PF() function is similar to strcpy_PF() except that not more
    than \e n bytes of \e src are copied.  Thus, if there is no null byte among
    the first \e n bytes of \e src, the result will not be null-terminated.

    In the case where the length of \e src is less than that of \e n, the
    remainder of \e dst will be padded with nulls.

    \param dst A pointer to the destination string in SRAM
    \param src A far pointer to the source string in Flash
    \param n The maximum number of bytes to copy

    \returns The strncpy_PF() function returns a pointer to the destination
    string \e dst. */
extern char *strncpy_PF(char *dest, uint_farptr_t src, size_t len);

/** \ingroup avr_pgmspace
    \fn char *strcat_PF(char *dst, uint_farptr_t src)
    \brief Concatenates two strings

    The strcat_PF() function is similar to strcat() except that the \e src
    string must be located in program space (flash) and is addressed using
    a far pointer

    \param dst A pointer to the destination string in SRAM
    \param src A far pointer to the string to be appended in Flash

    \returns The strcat_PF() function returns a pointer to the resulting
    string \e dst. */
extern char *strcat_PF(char *dest, uint_farptr_t src);

/** \ingroup avr_pgmspace
    \fn size_t strlcat_PF(char *dst, uint_farptr_t src, size_t n)
    \brief Concatenate two strings

    The strlcat_PF() function is similar to strlcat(), except that the \e src
    string must be located in program space (flash) and is addressed using
    a far pointer.

    Appends src to string dst of size \e n (unlike strncat(), \e n is the
    full size of \e dst, not space left).  At most \e n-1 characters
    will be copied.  Always NULL terminates (unless \e n <= strlen(\e dst)).

    \param dst A pointer to the destination string in SRAM
    \param src A far pointer to the source string in Flash
    \param n The total number of bytes allocated to the destination string

    \returns The strlcat_PF() function returns strlen(\e src) + MIN(\e n,
    strlen(initial \e dst)).  If retval >= \e n, truncation occurred. */
extern size_t strlcat_PF(char *dst, uint_farptr_t src, size_t siz);

/** \ingroup avr_pgmspace
    \fn char *strncat_PF(char *dst, uint_farptr_t src, size_t n)
    \brief Concatenate two strings

    The strncat_PF() function is similar to strncat(), except that the \e src
    string must be located in program space (flash) and is addressed using a
    far pointer.

    \param dst A pointer to the destination string in SRAM
    \param src A far pointer to the source string in Flash
    \param n The maximum number of bytes to append

    \returns The strncat_PF() function returns a pointer to the resulting
    string \e dst. */
extern char *strncat_PF(char *dest, uint_farptr_t src, size_t len);

/** \ingroup avr_pgmspace
    \fn int strcmp_PF(const char *s1, uint_farptr_t s2)
    \brief Compares two strings

    The strcmp_PF() function is similar to strcmp() except that \e s2 is a far
    pointer to a string in program space.

    \param s1 A pointer to the first string in SRAM
    \param s2 A far pointer to the second string in Flash

    \returns The strcmp_PF() function returns an integer less than, equal to,
    or greater than zero if \e s1 is found, respectively, to be less than, to
    match, or be greater than \e s2. */
extern int strcmp_PF(const char *s1, uint_farptr_t s2) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn int strncmp_PF(const char *s1, uint_farptr_t s2, size_t n)
    \brief Compare two strings with limited length

    The strncmp_PF() function is similar to strcmp_PF() except it only
    compares the first (at most) \e n characters of \e s1 and \e s2.

    \param s1 A pointer to the first string in SRAM
    \param s2 A far pointer to the second string in Flash
    \param n The maximum number of bytes to compare

    \returns The strncmp_PF() function returns an integer less than, equal
    to, or greater than zero if \e s1 (or the first \e n bytes thereof) is found,
    respectively, to be less than, to match, or be greater than \e s2. */
extern int strncmp_PF(const char *s1, uint_farptr_t s2, size_t n) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn int strcasecmp_PF(const char *s1, uint_farptr_t s2)
    \brief Compare two strings ignoring case

    The strcasecmp_PF() function compares the two strings \e s1 and \e s2, ignoring
    the case of the characters.

    \param s1 A pointer to the first string in SRAM
    \param s2 A far pointer to the second string in Flash

    \returns The strcasecmp_PF() function returns an integer less than, equal
    to, or greater than zero if \e s1 is found, respectively, to be less than, to
    match, or be greater than \e s2. */
extern int strcasecmp_PF(const char *s1, uint_farptr_t s2) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn int strncasecmp_PF(const char *s1, uint_farptr_t s2, size_t n)
    \brief Compare two strings ignoring case

    The strncasecmp_PF() function is similar to strcasecmp_PF(), except it
    only compares the first \e n characters of \e s1 and the string in flash is
    addressed using a far pointer.

    \param s1 A pointer to a string in SRAM
    \param s2 A far pointer to a string in Flash
    \param n The maximum number of bytes to compare

    \returns The strncasecmp_PF() function returns an integer less than, equal
    to, or greater than zero if \e s1 (or the first \e n bytes thereof) is found,
    respectively, to be less than, to match, or be greater than \e s2. */
extern int strncasecmp_PF(const char *s1, uint_farptr_t s2, size_t n) __ATTR_PURE__;

/** \ingroup avr_pgmspace
    \fn uint_farptr_t strchr_PF(uint_farptr_t s, int val)
    \brief Locate character in far program space string.

    The strchr_PF() function locates the first occurrence of \p val
    (converted to a char) in the string pointed to by \p s in far program
    space. The terminating null character is considered to be part of
    the string.

    The strchr_PF() function is similar to strchr() except that \p s is
    a far pointer to a string in program space that's \e not \e required to be
    located in the lower 64 KiB block like it is the case  for strchr_P().

    \returns The strchr_PF() function returns a far pointer to the matched
    character or \c 0 if the character is not found. */
extern uint_farptr_t strchr_PF(uint_farptr_t, int __val) __ATTR_CONST__;

/** \ingroup avr_pgmspace
    \fn char *strstr_PF(const char *s1, uint_farptr_t s2)
    \brief Locate a substring.

    The strstr_PF() function finds the first occurrence of the substring \c s2
    in the string \c s1.  The terminating '\\0' characters are not
    compared.
    The strstr_PF() function is similar to strstr() except that \c s2 is a
    far pointer to a string in program space.

    \returns The strstr_PF() function returns a pointer to the beginning of the
    substring, or NULL if the substring is not found.
    If \c s2 points to a string of zero length, the function returns \c s1. */
extern char *strstr_PF(const char *s1, uint_farptr_t s2);

/** \ingroup avr_pgmspace
    \fn size_t strlcpy_PF(char *dst, uint_farptr_t src, size_t siz)
    \brief Copy a string from progmem to RAM.

    Copy src to string dst of size siz.  At most siz-1 characters will be
    copied. Always NULL terminates (unless siz == 0).

    \returns The strlcpy_PF() function returns strlen(src). If retval >= siz,
    truncation occurred.  */
extern size_t strlcpy_PF(char *dst, uint_farptr_t src, size_t siz);

/** \ingroup avr_pgmspace
    \fn int memcmp_PF(const void *s1, uint_farptr_t s2, size_t len)
    \brief Compare memory areas

    The memcmp_PF() function compares the first \p len bytes of the memory
    areas \p s1 and flash \p s2. The comparison is performed using unsigned
    char operations. It is an equivalent of memcmp_P() function, except
    that it is capable working on all FLASH including the extended area
    above 64kB.

    \returns The memcmp_PF() function returns an integer less than, equal
    to, or greater than zero if the first \p len bytes of \p s1 is found,
    respectively, to be less than, to match, or be greater than the first
    \p len bytes of \p s2.  */
extern int memcmp_PF(const void *, uint_farptr_t, size_t) __ATTR_PURE__;

#ifdef __DOXYGEN__
#else /* !DOXYGEN */

#ifdef __AVR_TINY__
/* GCC PR71948: AVR_TINY may use open coded C/C++ to read from progmem.  */
#include <string.h>

#define memcpy_P(x, y, z) memcpy(x, y, z)
#define strlen_P(x) strlen(x)
#define strcpy_P(x, y) strcpy(x, y)
#define stpcpy_P(x, y) stpcpy(x, y)

#else

/* memcpy_P is common so we model its GPR footprint.  */
extern __ATTR_ALWAYS_INLINE__ __ATTR_GNU_INLINE__
void* memcpy_P(void *__x, const void *__z, size_t __s)
{
  register size_t __r20 __asm("20") = __s;
  void *__ret = __x;
  __asm volatile ("%~call __memcpy_P ; [[len=%~call]]"
                  : "+x" (__x), "+z" (__z), "+r" (__r20)
                  :: "0", "memory");
  return __ret;
}

/* strlen_P is common so we model its GPR footprint.  */
extern __ATTR_ALWAYS_INLINE__ __ATTR_GNU_INLINE__
size_t strlen_P(const char *__s)
{
  if (__builtin_constant_p (__builtin_strlen (__s)))
    {
      return __builtin_strlen (__s);
    }
  else
    {
      register const char *__r24 __asm("24") = __s;
      register size_t __res __asm("24");
      __asm ("%~call strlen_P ; [[len=%~call]]"
             : "=r" (__res) : "r" (__r24)
             : "0", "30", "31");
      return __res;
    }
}

/* strcpy_P is common so we model its GPR footprint.  */
extern __ATTR_ALWAYS_INLINE__ __ATTR_GNU_INLINE__
char* strcpy_P(char *__x, const char *__z)
{
  char *__ret = __x;
  __asm volatile ("%~call __strcpy_P ; [[len=%~call]]"
                  : "+x" (__x), "+z" (__z) :: "0", "memory");
  return __ret;
}

extern __ATTR_ALWAYS_INLINE__ __ATTR_GNU_INLINE__
char* stpcpy_P(char *__x, const char *__z)
{
  __asm volatile ("%~call __strcpy_P ; [[len=%~call]]"
                  : "+x" (__x), "+z" (__z) :: "0", "memory");
  return __x - 1;
}

/* strcmp_P is common so we model its GPR footprint.  */
extern __ATTR_ALWAYS_INLINE__ __ATTR_GNU_INLINE__
int strcmp_P(const char *__x, const char *__z)
{
  register int __ret __asm("24");
  __asm ("%~call __strcmp_P ; [[len=%~call]]"
         : "=r" (__ret), "+x" (__x), "+z" (__z) :: "memory");
  return __ret;
}

#endif /* AVR_TINY */

#endif /* DOXYGEN */

#ifdef __cplusplus
} // extern "C"
#endif

#if defined(__cplusplus) && defined(__pgm_read_template__)

/* Caveat: When this file is found via -isystem <path>, then some older
   avr-g++ versions come up with

       error: template with C linkage

   because the target description did not define NO_IMPLICIT_EXTERN_C.  */

template<typename __T, size_t>
struct __pgm_read_impl
{
  // A default implementation for T's with a size not in { 1, 2, 3, 4, 8 }.
  // While this works, the performance is absolute scrap because GCC does
  // not handle objects well that don't fit in a register (i.e. avr-gcc
  // has no respective machine_mode).
  __T operator() (const __T *__addr) const
  {
    __T __res;
    memcpy_P (&__res, __addr, sizeof(__T));
    return __res;
  }
};

template<typename __T>
struct __pgm_read_impl<__T, 1>
{
  __T operator() (const __T *__addr) const
  {
    __T __res; __LPM__1 (__res, __addr); return __res;
  }
};

template<typename __T>
struct __pgm_read_impl<__T, 2>
{
  __T operator() (const __T *__addr) const
  {
    __T __res; __LPM__2 (__res, __addr); return __res;
  }
};

template<typename __T>
struct __pgm_read_impl<__T, 3>
{
  __T operator() (const __T *__addr) const
  {
    __T __res; __LPM__3 (__res, __addr); return __res;
  }
};

template<typename __T>
struct __pgm_read_impl<__T, 4>
{
  __T operator() (const __T *__addr) const
  {
    __T __res; __LPM__4 (__res, __addr); return __res;
  }
};

template<typename __T>
struct __pgm_read_impl<__T, 8>
{
  __T operator() (const __T *__addr) const
  {
    __T __res; __LPM__8 (__res, __addr); return __res;
  }
};

template<typename __T>
__T pgm_read (const __T *__addr)
{
  return __pgm_read_impl<__T, sizeof(__T)>() (__addr);
}

//////////////////////////////////////////////////////////

template<typename __T, size_t>
struct __pgm_read_far_impl
{
  // A default implementation for T's with a size not in { 1, 2, 3, 4, 8 }.
  // While this works, the performance is absolute scrap because GCC does
  // not handle objects well that don't fit in a register (i.e. avr-gcc
  // has no respective machine_mode).
  __T operator() (const __T *__addr) const
  {
    __T __res;
    memcpy_PF (&__res, __addr, sizeof(__T));
    return __res;
  }
};

template<typename __T>
struct __pgm_read_far_impl<__T, 1>
{
  __T operator() (uint_farptr_t __addr) const
  {
    __T __res; __ELPM__1 (__res, __addr, __T); return __res;
  }
};

template<typename __T>
struct __pgm_read_far_impl<__T, 2>
{
  __T operator() (uint_farptr_t __addr) const
  {
    __T __res; __ELPM__2 (__res, __addr, __T); return __res;
  }
};

template<typename __T>
struct __pgm_read_far_impl<__T, 3>
{
  __T operator() (uint_farptr_t __addr) const
  {
    __T __res; __ELPM__3 (__res, __addr, __T); return __res;
  }
};

template<typename __T>
struct __pgm_read_far_impl<__T, 4>
{
  __T operator() (uint_farptr_t __addr) const
  {
    __T __res; __ELPM__4 (__res, __addr, __T); return __res;
  }
};

template<typename __T>
struct __pgm_read_far_impl<__T, 8>
{
  __T operator() (uint_farptr_t __addr) const
  {
    __T __res; __ELPM__8 (__res, __addr, __T); return __res;
  }
};

template<typename __T>
__T pgm_read_far (uint_farptr_t __addr)
{
  return __pgm_read_far_impl<__T, sizeof(__T)>() (__addr);
}

#endif /* C++ */

#ifdef __DOXYGEN__

/** \name Templates */

/** \ingroup avr_pgmspace
    \fn T pgm_read<T> (const T *addr)

    Read an object of type \c T from program memory address \p addr and
    return it.
    This template is only available when macro \c __pgm_read_template__
    is defined.
    \since AVR-LibC v2.2  */
template<typename T>
T pgm_read<T> (const T *addr);

/** \ingroup avr_pgmspace
    \fn T pgm_read_far<T> (uint_farptr_t addr)

    Read an object of type \c T from program memory address \p addr and
    return it.
    This template is only available when macro \c __pgm_read_template__
    is defined.
    \since AVR-LibC v2.2  */
template<typename T>
T pgm_read_far<T> (uint_farptr_t addr);
#endif /* DOXYGEN */

#endif /* __PGMSPACE_H_ */
