__strreverse.s (2032B)
1;-------------------------------------------------------------------------- 2; __strreverse.s 3; 4; Copyright (C) 2020, Sergey Belyashov 5; 6; This library is free software; you can redistribute it and/or modify it 7; under the terms of the GNU General Public License as published by the 8; Free Software Foundation; either version 2, or (at your option) any 9; later version. 10; 11; This library is distributed in the hope that it will be useful, 12; but WITHOUT ANY WARRANTY; without even the implied warranty of 13; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14; GNU General Public License for more details. 15; 16; You should have received a copy of the GNU General Public License 17; along with this library; see the file COPYING. If not, write to the 18; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, 19; MA 02110-1301, USA. 20; 21; As a special exception, if you link this library with other files, 22; some of which are compiled with SDCC, to produce an executable, 23; this library does not by itself cause the resulting executable to 24; be covered by the GNU General Public License. This exception does 25; not however invalidate any other reasons why the executable file 26; might be covered by the GNU General Public License. 27;-------------------------------------------------------------------------- 28 29 .area _CODE 30 31 .globl ___strreverse 32 .globl ___strreverse_reg 33; 34;char * __reverse(char *beg, char *end); 35; 36___strreverse:: 37 pop bc 38 pop de 39 pop hl 40 push hl 41 push de 42 push bc 43 44;in: HL - pointer to end of string (null symbol), DE - pointer to start of string 45; 46___strreverse_reg:: 47 push de 48 jr 110$ 49100$: 50 add hl, de 51 ld a, (de) 52 ld c, (hl) 53 ld (hl), a 54 ld a, c 55 ld (de), a 56 inc de 57110$: 58 dec hl 59 or a, a 60 sbc hl, de 61 jr NC, 100$ 62 pop hl 63 ret