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/* Copyright (c) 2006, Carlos Lamas
based on libc/pmstring/strlcat_P.S which is
Copyright (c) 2003, Eric B. Weddington, R. Patommel
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.
*/
/* $Id: strlcat_PF.S 2191 2010-11-05 13:45:57Z arcanum $ */
/** \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. The
contents of RAMPZ SFR are undefined when the funcion returns */
#if !defined(__AVR_TINY__)
#if !defined(__DOXYGEN__)
#include "macros.inc"
#define dst_b1 r25
#define dst_b0 r24
#define src_b30 r23 /* ignored */
#define src_b20 r22 /* moved to src_b2 in the code */
#define src_b1 r21
#define src_b0 r20
#define siz_b1 r19
#define siz_b0 r18
#define src_b2 r28 /* must be preserved */
#define dlen_b1 src_b30
#define dlen_b0 src_b20
#define rWord_b1 r25
#define rWord_b0 r24
.text
.global _U(strlcat_PF)
.type _U(strlcat_PF),@function
_U(strlcat_PF):
push src_b2
mov src_b2, src_b20
X_movw XL, dst_b0 ; X = dst
X_movw ZL, src_b0 ; Z = src
LPM_R0_ZPLUS_INIT src_b2
.L_strlcat_PF_dlen: ; Find end of dst string
ld r0, X+ ; get next char from dst
cp siz_b0, __zero_reg__ ; and calc dlen = len of dst
cpc siz_b1, __zero_reg__ ; size == 0 ?
breq 1f ; --> done
tst r0 ; end of dst ?
breq 1f ; --> done
subi siz_b0, lo8(1)
sbci siz_b1, hi8(1) ; siz--
rjmp .L_strlcat_PF_dlen ; --> next char
1: sbiw XL, 1 ; undo post increment
X_movw dlen_b0, XL
sub dlen_b0, dst_b0
sbc dlen_b1, dst_b1 ; dlen = X - dst
cp siz_b0, __zero_reg__
cpc siz_b1, __zero_reg__ ; size == 0 ?
breq .L_strlcat_PF_slen ; --> done
subi siz_b0, lo8(1)
sbci siz_b1, hi8(1) ; siz--
.L_strlcat_PF_concat: ; Concatenate
LPM_R0_ZPLUS_NEXT src_b2 ; get next char from src
cp siz_b0, __zero_reg__
cpc siz_b1, __zero_reg__ ; size == 0 ?
breq 1f ; --> done
tst r0 ; end of src ?
breq 1f ; --> done
st X+, r0 ; store in dest
subi siz_b0, lo8(1)
sbci siz_b1, hi8(1) ; siz--
rjmp .L_strlcat_PF_concat ; --> next char
1: st X, __zero_reg__ ; *X = '\0'
sbiw ZL, 1 ; undo post increment
#ifdef RAMPZ
in r0, _SFR_IO_ADDR(RAMPZ)
sbc r0, __zero_reg__
out _SFR_IO_ADDR(RAMPZ), r0
#endif
.L_strlcat_PF_slen:
LPM_R0_ZPLUS_NEXT src_b2 ; get next char from src
tst r0 ; end of src ?
brne .L_strlcat_PF_slen ; --> next char
sbiw ZL, 1 ; undo post increment
#ifdef RAMPZ
in r0, _SFR_IO_ADDR(RAMPZ)
sbc r0, __zero_reg__
out _SFR_IO_ADDR(RAMPZ), r0
#endif
X_movw rWord_b0, dlen_b0
add rWord_b0, ZL
adc rWord_b1, ZH
sub rWord_b0, src_b0
sbc rWord_b1, src_b1 ; return(dlen + (Z - src))
pop src_b2
ret
.L_strlcat_PF_end:
.size _U(strlcat_PF), .L_strlcat_PF_end - _U(strlcat_PF)
#endif /* not __DOXYGEN__ */
#endif /* !defined(__AVR_TINY__) */
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