mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-28 01:09:41 +03:00
126 lines
3.4 KiB
PHP
126 lines
3.4 KiB
PHP
; some strtok-like function
|
|
;
|
|
; Copyright (c) 2003 Thomas Mathys
|
|
; killer@vantage.ch
|
|
;
|
|
; This program 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 of the License, or
|
|
; (at your option) any later version.
|
|
;
|
|
; This program 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 program; if not, write to the Free Software
|
|
; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
;
|
|
%ifndef _STRTOK_INC
|
|
%define _STRTOK_INC
|
|
|
|
|
|
;********************************************************************
|
|
; strtok
|
|
; this function works like strtok from a c runtime library.
|
|
; note that it is not threadsafe. it would be an easy task
|
|
; to make it threadsafe, though:
|
|
; .adx must be removed, instead the last search address is
|
|
; stored at some location provided by the user (passed as
|
|
; a third parameter in ecx or so)
|
|
;
|
|
; input:
|
|
;
|
|
; eax : address of string to be searched (asciiz), or
|
|
; 0 to get the next token of the current string
|
|
; ebx : address of delimiter list (asciiz)
|
|
;
|
|
; output:
|
|
;
|
|
; eax : pointer to the next token, or 0 if there
|
|
; aren't any tokens anymore.
|
|
;
|
|
; destroys: nothing
|
|
;
|
|
;********************************************************************
|
|
strtok:
|
|
pushad
|
|
pushfd
|
|
|
|
; get start address
|
|
; if the new start address is 0, and the old address (.adx)
|
|
; is also 0, then there's nothing to do and we return 0.
|
|
or eax,eax ; new address = 0 ?
|
|
jz .nonewstring ; nope -> use old string
|
|
mov [.adx],eax ; yeah -> store new string adx
|
|
.nonewstring:
|
|
mov esi,[.adx] ; load string address
|
|
or esi,esi ; 0 ?
|
|
jnz .startadxok ; nope -> ok
|
|
xor eax,eax ; yeah -> return 0
|
|
je .bye
|
|
.startadxok:
|
|
|
|
; skip leading delimiters
|
|
.skipdelimiters:
|
|
lodsb ; read character
|
|
mov edi,ebx ; edi -> delimiter list
|
|
.foo:
|
|
mov cl,[edi] ; get delimiter
|
|
inc edi
|
|
or cl,cl ; end of delimiter list
|
|
jz .endofdelimiterlist
|
|
cmp al,cl ; if AL is a delimiter, then
|
|
je .skipdelimiters ; we need to skip it too...
|
|
jmp .foo ; otherwise try next delimiter
|
|
.endofdelimiterlist:
|
|
|
|
; end of string reached without finding any non-delimiters ?
|
|
or al,al ; character = 0 ?
|
|
jnz .bar ; nope -> continue
|
|
mov dword [.adx],0 ; yeah -> remember this
|
|
xor eax,eax ; and return 0
|
|
jmp .bye
|
|
.bar:
|
|
|
|
; found the start of a token, let's store its address
|
|
mov edx,esi
|
|
dec edx ; edx = start address of token
|
|
|
|
; find the end of the token
|
|
.abraham:
|
|
lodsb ; get character
|
|
mov edi,ebx ; edi -> delimiter list
|
|
.bebraham:
|
|
mov cl,[edi] ; get delimiter
|
|
inc edi
|
|
cmp al,cl ; is AL a delimiter ?
|
|
jne .cebraham ; nope -> continue
|
|
or al,al ; terminating zero found ?
|
|
jnz .argle
|
|
xor esi,esi ; yeah -> remember this
|
|
jmp .bargle
|
|
.argle:
|
|
mov byte [esi-1],0 ; nope -> mark end of token
|
|
.bargle:
|
|
mov [.adx],esi ; remember search address
|
|
mov eax,edx ; return token address
|
|
jmp .bye
|
|
.cebraham:
|
|
or cl,cl ; end of delimiter list ?
|
|
jnz .bebraham ; nope -> try next delimiter
|
|
jmp .abraham
|
|
|
|
; write return value into stack, so that when popad
|
|
; gets executed, eax will receive the return value.
|
|
.bye:
|
|
mov [esp+4*8],eax
|
|
popfd
|
|
popad
|
|
ret
|
|
.adx dd 0
|
|
|
|
%endif
|
|
|