/* Copyright (c) 2012 Georg-Johann Lay 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 (__DOXYGEN__) #if !defined (__AVR_TINY__) #include "asmdef.h" /* char *__ultoa_ncheck (unsigned long val, char *s, unsigned char radix) This function is the utoa() without checking the radix for 2..36 margins. */ #define val_lo r22 #define val_hi r23 #define val_hlo r24 #define val_hhi r25 #define str_lo r20 #define radix r18 #define counter r19 #define digit r26 #define sign r27 ENTRY __ultoa_ncheck clr sign ENTRY __ultoa_common X_movw ZL, str_lo 1: ; Saves one iteration of the digit-loop: ; If val < radix we can use the low byte of val as digit mov digit, val_lo cp val_lo, radix cpc val_hi, __zero_reg__ cpc val_hlo, __zero_reg__ cpc val_hhi, __zero_reg__ ; now C is set, if val < radix sbc counter, counter bst counter, 0 brts 4f ; counter == 0 here ; If val >= radix, then pop one digit from val clr digit 2: ; Vanilla 32:8 quotient and remainder to pop the digit ; digit <- val % radix ; val <- val / radix lsl val_lo rol val_hi rol val_hlo rol val_hhi rol digit cp digit, radix brlo 3f sub digit, radix ; val |= 1 inc val_lo 3: ; Loop the 32 bits subi counter, 8 ; 256 / 8 == 32 loops brne 2b 4: ; Convert the digit to ASCII... subi digit, -'0' cpi digit, '9'+1 brlo 5f subi digit, '0'-'a'+10 5: ; ... and store it to the reversed string st Z+, digit ; Popped all digits? brtc 1b ; Yes: Store the sign (if any) cpse sign, __zero_reg__ st Z+, sign ; Terminate the string with '\0' 7: st Z, __zero_reg__ ; Reverse the string and return the original string pointer X_movw r24, str_lo XJMP _U(strrev) ENDFUNC #endif /* !__AVR_TINY__ */ #endif /* !__DOXYGEN__ */