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Copyright (c) 2003, Eric B. Weddington
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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* Neither the name of the copyright holders nor the names of
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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/** \ingroup avr_pgmspace
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\fn size_t strlcpy_P (char *dst, PGM_P, size_t siz)
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\brief Copy a string from progmem to RAM.
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Copy src to string dst of size siz. At most siz-1 characters will be
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copied. Always NULL terminates (unless siz == 0).
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\returns The strlcpy_P() function returns strlen(src). If retval >= siz,
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truncation occurred. */
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.type _U(strlcpy_P), @function
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LOAD_X (dst_lo, dst_hi) ; X = dst
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LOAD_Z (src_lo, src_hi) ; Z = src
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cp siz_lo, __zero_reg__
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cpc siz_hi, __zero_reg__ ; size == 0 ?
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breq .strlcpy_P_truncated
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.strlcpy_P_copy_loop: ; copy src to dst
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subi siz_lo, lo8(-(-1))
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sbci siz_hi, hi8(-(-1)) ; decrement siz
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breq 1f ; --> siz chars copied
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LPM_R0_ZP ; get next src char
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st X+, __tmp_reg__ ; copy char
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tst __tmp_reg__ ; end of src string ?
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breq .strlcpy_P_len ; --> all src chars copied
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rjmp .strlcpy_P_copy_loop ; next char
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1: st X, __zero_reg__ ; truncate dst string
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.strlcpy_P_truncated: ; find Z = end of src string
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LPM_R0_ZP ; get next char from src
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tst __tmp_reg__ ; end of src string ?
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brne .strlcpy_P_truncated ; next char
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.strlcpy_P_len: ; calculate strlen(src)
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sbc Z_hi, src_hi ; Z points past \0
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.size _U(strlcpy_P), .strlcpy_P_end - _U(strlcpy_P)
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#endif /* not DOXYGEN */
added
removed
libc/pmstring/strlcpy_P.S
