| /* |
| AVR LIBC |
| strlcpy_P() |
| |
| Copyright (c) 2003, 2005, 2006, 2007 Eric B. Weddington |
| Copyright (c) 2009 Dmitry Xmelkov |
| 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: strlcpy_P.S 2191 2010-11-05 13:45:57Z arcanum $ */ |
| |
| /** \file */ |
| |
| /** \ingroup avr_pgmspace |
| \fn size_t strlcpy_P (char *dst, PGM_P 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 the |
| \p src is pointer to a string in memory space. |
| |
| \returns The strlcpy_P() function returns strlen(src). If |
| retval >= siz, truncation occurred. */ |
| |
| #if !defined(__AVR_TINY__) |
| |
| #if !defined(__DOXYGEN__) |
| |
| #include "asmdef.h" |
| |
| #define dst_lo r24 |
| #define src_hi r23 |
| #define src_lo r22 |
| #define siz_hi r21 |
| #define siz_lo r20 |
| #define rslt_lo r24 |
| |
| |
| ENTRY strlcpy_P |
| X_movw XL, dst_lo ; X = dst |
| X_movw ZL, src_lo ; Z = src |
| |
| ; copy loop |
| 1: subi siz_lo, lo8(1) |
| sbci siz_hi, hi8(1) |
| brcs 4f ; is possible with siz == 0 |
| breq 3f ; --> siz chars copied |
| X_lpm __tmp_reg__, Z+ |
| st X+, __tmp_reg__ |
| tst __tmp_reg__ |
| brne 1b |
| |
| ; calculate result (Z - 1 - src) and return |
| 2: sub ZL, src_lo |
| sbc ZH, src_hi |
| sbiw ZL, 1 |
| X_movw rslt_lo, ZL |
| ret |
| |
| ; terminate dst |
| 3: st X, __zero_reg__ |
| |
| ; find src end |
| 4: X_lpm __tmp_reg__, Z+ |
| tst __tmp_reg__ |
| brne 4b |
| rjmp 2b |
| |
| ENDFUNC |
| |
| #endif /* not __DOXYGEN__ */ |
| |
| #endif /* !defined(__AVR_TINY__) */ |