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|
;--------------------------------------------------------------------------
; strcmp.s
;
; Copyright (C) 2016, Philipp Klaus Krause
;
; This library is free software; you can redistribute it and/or modify it
; under the terms of the GNU General Public License as published by the
; Free Software Foundation; either version 2, or (at your option) any
; later version.
;
; This library is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this library; see the file COPYING. If not, write to the
; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
; MA 02110-1301, USA.
;
; As a special exception, if you link this library with other files,
; some of which are compiled with SDCC, to produce an executable,
; this library does not by itself cause the resulting executable to
; be covered by the GNU General Public License. This exception does
; not however invalidate any other reasons why the executable file
; might be covered by the GNU General Public License.
;--------------------------------------------------------------------------
.globl _strcmp
.area CODE
_strcmp:
ldw y, (3, sp)
ldw x, (5, sp)
loop:
ld a, (y)
jreq null
cp a, (x)
jrne diff
ld a, (1, y)
jreq null_1
cp a, (1, x)
jrne diff
ld a, (2, y)
jreq null_2
cp a, (2, x)
jrne diff
addw y, #3
addw x, #3
jra loop
null_2:
incw x
null_1:
incw x
null:
tnz (x)
jrne less
clrw x
ret
diff:
jrult less
ldw x, #1
ret
less:
ldw x, #-1
ret
|
