# strcpy_PF.S

/* Copyright (c) 2006, Carlos Lamas

based on libc/pmstring/strcpy_P.S which is

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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
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE. */

/* $Id$ */

#if !defined(__AVR_TINY__)

#include "macros.inc"

#define dest_b1 r25
#define dest_b0 r24
#define src_b3 r23
#define src_b2 r22
#define src_b1 r21
#define src_b0 r20

/** \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. The contents of RAMPZ SFR are undefined when the funcion
returns */

#if !defined(__DOXYGEN__)

.text
.global _U(strcpy_PF)
.type   _U(strcpy_PF), @function

_U(strcpy_PF):

X_movw  ZL, src_b0
LPM_R0_ZPLUS_INIT src_b2
X_movw  XL, dest_b0

.L_strcpy_PF_loop:

LPM_R0_ZPLUS_NEXT src_b2
st      X+, r0
tst     r0
brne    .L_strcpy_PF_loop
LPM_R0_ZPLUS_FINI src_b2
; return dest (unchanged)

ret

.L_strcpy_PF_end:

.size   _U(strcpy_PF), .L_strcpy_PF_end - _U(strcpy_PF)

#endif /* not __DOXYGEN__ */

#endif /* !defined(__AVR_TINY__) */