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/* Copyright (c) 2006, Carlos Lamas
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based on libc/pmstring/strncpy_P.S which is
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Copyright (c) 2002, Marek Michalkiewicz
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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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/* $Id: strncpy_PF.S 2191 2010-11-05 13:45:57Z arcanum $ */
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#if !defined(__AVR_TINY__)
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/** \ingroup avr_pgmspace
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\fn char *strncpy_PF (char *dst, uint_farptr_t src, size_t n)
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\brief Duplicate a string until a limited length
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The strncpy_PF() function is similar to strcpy_PF() except that not more
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than \e n bytes of \e src are copied. Thus, if there is no null byte among
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the first \e n bytes of \e src, the result will not be null-terminated
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In the case where the length of \e src is less than that of \e n, the
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remainder of \e dst will be padded with nulls
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\param dst A pointer to the destination string in SRAM
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\param src A far pointer to the source string in Flash
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\param n The maximum number of bytes to copy
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\returns The strncpy_PF() function returns a pointer to the destination
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string \e dst. The contents of RAMPZ SFR are undefined when the function
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#if !defined(__DOXYGEN__)
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.global _U(strncpy_PF)
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.type _U(strncpy_PF), @function
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LPM_R0_ZPLUS_INIT src_b2
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brcs .L_strncpy_PF_done
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LPM_R0_ZPLUS_NEXT src_b2
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brne .L_strncpy_PF_loop
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; store null characters up to the end of dest
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; as the glibc manual says:
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; This behavior is rarely useful, but it is specified by the ISO C standard.
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rjmp .L_strncpy_PF_clr_start
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.L_strncpy_PF_clr_loop:
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.L_strncpy_PF_clr_start:
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brcc .L_strncpy_PF_clr_loop
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; return dest (unchanged)
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.size _U(strncpy_PF), .L_strncpy_PF_end - _U(strncpy_PF)
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#endif /* not __DOXYGEN__ */
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#endif /* !defined(__AVR_TINY__) */
added
removed
libc/pmstring/strncpy_PF.S
