/* AVR LIBC strlcat() Copyright (c) 2003, 2007 Eric B. Weddington, R. Patommel 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. */ /* $Id$ */ #if !defined(__AVR_TINY__) #if !defined(__DOXYGEN__) #include "asmdef.h" /* size_t strlcat (char *dst, const char *src, size_t siz) { char *d = dst; const char *s = src; do { if (--siz == ~0u) goto Len; // siz <= strlen(dst) } while (*d++); d -= 1; goto m; do { if (!(*d++ = *s++)) return (d - dst - 1); // normal end m: ; } while (--siz != ~0u); *d = 0; Len: return (d - dst + strlen (s)); } */ #define dst_lo r24 #define dst_hi r25 #define src_lo r22 #define src_hi r23 #define siz_lo r20 #define siz_hi r21 #define ret_lo r24 ENTRY strlcat X_movw XL, dst_lo ; X = dst X_movw ZL, src_lo ; Z = src ; find end of dst: X := dst + strlen(dsr) 1: subi siz_lo, lo8(1) sbci siz_hi, hi8(1) brlo .Len ; siz <= strlen(dst) ld __tmp_reg__, X+ tst __tmp_reg__ brne 1b sbiw XL, 1 rjmp 3f ; copy loop 2: ld __tmp_reg__, Z+ st X+, __tmp_reg__ tst __tmp_reg__ breq .Ldd 3: subi siz_lo, lo8(1) sbci siz_hi, hi8(1) brsh 2b st X, __zero_reg__ ; return (d - dst + strlen(s)) X_movw src_lo, ZL ; update for strlen(s) calculation .Len: ld __tmp_reg__, Z+ ; find end of src tst __tmp_reg__ brne .Len sub ZL, src_lo ; Z := strlen(s) + 1 sbc ZH, src_hi add XL, ZL ; d += strlen(s) + 1 adc XH, ZH .Ldd: sec ; d -= dst + 1 sbc XL, dst_lo sbc XH, dst_hi X_movw ret_lo, XL ; return value ret ENDFUNC #endif /* not __DOXYGEN__ */ #endif /* not __AVR_TINY__ */