Re: A86: ot: string comparison
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Re: A86: ot: string comparison
>> _strlen equ 4957h ;bc = length of string (hl)
>These routines are all for strings with a two byte length header; here's a
>routine to compare strings preceded by a single length byte (hl) and (de):
Wouldn't that be redundant though? (I'd rather use a rom based routine to
count up string length than my own)
_________________________________________________
Stephen Horne -- HorneS@rpi.edu -- www.wickedquality.com
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-----Original Message-----
From: assets <assets@eden.rutgers.edu>
To: assembly-86@lists.ticalc.org <assembly-86@lists.ticalc.org>
Date: Thursday, September 10, 1998 6:20 PM
Subject: Re: A86: ot: string comparison
>
>
>
>Jeremy Goetsch wrote:
>
>> Here are some string routines in the ROM:
>>
>> _strlen equ 4957h ;bc = length of string (hl)
>> _strcpy equ 495Bh ;hl->source, de->destination
>> _strcat equ 495Fh ;hl->source, de->destination
>> _strcmp equ 4963h ;compare (hl) to (de), length bytes first
>
>These routines are all for strings with a two byte length header; here's a
>routine to compare strings preceded by a single length byte (hl) and (de):
>
>cp_lstr:
> ld a,(de)
> ld c,a
> sub (hl)
> ret nz
> ld b,a
> inc de
> inc hl
>cp_ls_loop:
> ld a,(de)
> inc de
> cpi
> ret nz
> ret po
> jr cp_ls_loop
>
>and a routine to compare zero-terminated strings (hl) and (de):
>
>cp_zstr:
> ld a,(de)
> inc de
> cpi
> ret nz
> or a
> ret z
> jr cp_zstr
>
>both of these routines set the zero flag if the strings match & reset the
zero
>flag the strings do not match
>
>>
>>
>> Jeremy G.
>>
>> >
>> > (This question might belong to shell-developers, but I'll check here
>> > first)...
>> >
>> > Hey, I've started developing a new shell (Linux86, looks pretty nifty
so
>> > far), but as most people should know linux, it's mostly string
>> > comparisons.
>> > Does anyone just "happen" to have any string comparison ruteins (in
asm)
>> > that might be lying around? Any help would be greatly appreciated!
>> >
>> >
>> > -Chuck
>> > chuckjr@sundial.net
>> >
>
>
>
>
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