gbdk-2020 | GameBoy Development Kit |
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gbdk-lib/libc/asm/sm83/strlen.s
1 ;--------------------------------------------------------------------------
2 ; strlen.s
3 ;
4 ; Copyright (C) 2020, Tony Pavlov
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 .module strlen
30
31 .area _HOME
32
33 _strlen::
34 lda HL, 2(SP)
35 ld A, (HL+)
36 ld H, (HL)
37 ld L, A
38 .strlen::
39 ld DE, #0
40 1$: ld A, (HL+)
41 or A
42 ret Z
43 inc DE
44 jr 1$
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