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126 lines
3.4 KiB
PHP
126 lines
3.4 KiB
PHP
; some strtok-like function
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;
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; Copyright (c) 2003 Thomas Mathys
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; killer@vantage.ch
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;
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; This program is free software; you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation; either version 2 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program; if not, write to the Free Software
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; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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;
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%ifndef _STRTOK_INC
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%define _STRTOK_INC
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;********************************************************************
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; strtok
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; this function works like strtok from a c runtime library.
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; note that it is not threadsafe. it would be an easy task
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; to make it threadsafe, though:
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; .adx must be removed, instead the last search address is
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; stored at some location provided by the user (passed as
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; a third parameter in ecx or so)
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;
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; input:
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;
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; eax : address of string to be searched (asciiz), or
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; 0 to get the next token of the current string
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; ebx : address of delimiter list (asciiz)
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;
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; output:
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;
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; eax : pointer to the next token, or 0 if there
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; aren't any tokens anymore.
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;
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; destroys: nothing
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;
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;********************************************************************
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strtok:
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pushad
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pushfd
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; get start address
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; if the new start address is 0, and the old address (.adx)
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; is also 0, then there's nothing to do and we return 0.
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or eax,eax ; new address = 0 ?
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jz .nonewstring ; nope -> use old string
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mov [.adx],eax ; yeah -> store new string adx
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.nonewstring:
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mov esi,[.adx] ; load string address
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or esi,esi ; 0 ?
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jnz .startadxok ; nope -> ok
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xor eax,eax ; yeah -> return 0
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je .bye
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.startadxok:
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; skip leading delimiters
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.skipdelimiters:
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lodsb ; read character
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mov edi,ebx ; edi -> delimiter list
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.foo:
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mov cl,[edi] ; get delimiter
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inc edi
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or cl,cl ; end of delimiter list
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jz .endofdelimiterlist
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cmp al,cl ; if AL is a delimiter, then
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je .skipdelimiters ; we need to skip it too...
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jmp .foo ; otherwise try next delimiter
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.endofdelimiterlist:
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; end of string reached without finding any non-delimiters ?
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or al,al ; character = 0 ?
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jnz .bar ; nope -> continue
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mov dword [.adx],0 ; yeah -> remember this
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xor eax,eax ; and return 0
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jmp .bye
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.bar:
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; found the start of a token, let's store its address
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mov edx,esi
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dec edx ; edx = start address of token
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; find the end of the token
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.abraham:
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lodsb ; get character
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mov edi,ebx ; edi -> delimiter list
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.bebraham:
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mov cl,[edi] ; get delimiter
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inc edi
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cmp al,cl ; is AL a delimiter ?
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jne .cebraham ; nope -> continue
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or al,al ; terminating zero found ?
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jnz .argle
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xor esi,esi ; yeah -> remember this
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jmp .bargle
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.argle:
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mov byte [esi-1],0 ; nope -> mark end of token
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.bargle:
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mov [.adx],esi ; remember search address
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mov eax,edx ; return token address
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jmp .bye
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.cebraham:
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or cl,cl ; end of delimiter list ?
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jnz .bebraham ; nope -> try next delimiter
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jmp .abraham
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; write return value into stack, so that when popad
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; gets executed, eax will receive the return value.
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.bye:
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mov [esp+4*8],eax
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popfd
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popad
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ret
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.adx dd 0
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%endif
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