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atoi.asm
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;File: atoi.asm
;================================================================
; PIC Floating point library
;================================================================
; Copyright (C) 1991,1997,1998,1999,2000,2001,2002,2003 Mike Gore
; 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 <ORGANIZATION> nor the names of its 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
;
; Contact Information
; Mike Gore
; Infowrite Consulting
; 405 Midwood Cres.
; Waterloo Ont
; N2L 5N4
; Phone: 519-884-4943 home
; Fax: 519-885-0548 fax
; Email: [email protected] - or - [email protected]
;================================================================
;================================================================
; ***** Please Use TABS = 4 when viewing this file ****
;================================================================
_SKIP_SPACES: ; Skip white space in input
GETC
; Eat white space
CMP8I _GETC_CHAR,' '
JMP_Z _SKIP_SPACES
CMP8I _GETC_CHAR,'\t'
JMP_Z _SKIP_SPACES
UNGETC _GETC_CHAR
ENDSUB
_GET_SIGN: ; Get character and test +/- sign, set _atoi_sign if negative
CLR8 _atoi_sign
GETC
; +/- ?
CMP8I _GETC_CHAR,'+'
JMP_Z _GET_SIGN_PLUS
CMP8I _GETC_CHAR,'-'
JMP_Z _GET_SIGN_NEG
; Done
UNGETC _GETC_CHAR ; Put Character back
_GET_SIGN_PLUS
ENDSUB
; -ve
_GET_SIGN_NEG
LOAD8I _atoi_sign,0x80
; +ve
ENDSUB
; ======================================================================
_TEST_DIG: ; Is _GETC_CHAR >='0' && <='9' ? Set Carry Clear, else Set Carry
CMP8I _GETC_CHAR,'0'
JMP_L _TEST_DIG_exit; < '0'
CMP8I _GETC_CHAR,'9'
JMP_G _TEST_DIG_exit; > '9'
SUB8I _GETC_CHAR,'0'
CLRC
ENDSUB
_TEST_DIG_exit:
SETC
ENDSUB
; ======================================================================
; Uses AC32,ARG32 and TMP32
_ATOI: ; Convert ACSII to integer, Store result in AC32
CLR8 _atoi_count
SKIP_SPACES
GET_SIGN
AC32_CLR
_atoi_loop
GETC
TEST_DIG
JMP_C _atoi_done
AC32_MUL10
ARG32_CLR
MOV8 ARG32_LSB,_GETC_CHAR
AC32_ADD
INC8 _atoi_count
JMP _atoi_loop
;
_atoi_done
UNGETC _GETC_CHAR
TST8 _atoi_sign
JMP_Z _atoi_exit
AC32_NEG
_atoi_exit
ENDSUB