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dos_rename.S revision 1.3 
      1 |	XC compatible RENAME() function
      2 |	int DOS_RENAME __P((const char *path, const char *newname));
      3 |
      4 |	written by ITOH Yasufumi
      5 |	public domain
      6 |
      7 |	$NetBSD: dos_rename.S,v 1.3 2011/02/21 02:31:59 itohy Exp $
      8 
      9 #include "dos_asm.h"
     10 
     11 Lbufsz	=	92	| sizeof(struct dos_nameckbuf)
     12 Lnamoff	=	67	| offsetof(struct dos_nameckbuf, name)
     13 Lextoff	=	86	| offsetof(struct dos_nameckbuf, ext)
     14 
     15 ENTRY_NOPROFILE(DOS_RENAME)
     16 	link	%a6,#-Lbufsz*2			| allocate two  dos_nameckbuf
     17 
     18 	moveal	%sp,%a1				| dos_nameckbuf for path
     19 
     20 	pea	%sp@(Lbufsz)
     21 	movel	%a6@(4 + 8),%sp@-		| newname
     22 	.word	0xff37				| DOS_NAMECK
     23 	tstl	%d0
     24 	bmis	Lerr
     25 
     26 	addql	#4,%sp
     27 
     28 	movel	%a1,%sp@
     29 	movel	%a6@(4 + 4),%sp@-		| (old) path
     30 	.word	0xff37				| DOS_NAMECK
     31 	tstl	%d0
     32 	bmis	Lerr
     33 
     34 	| we don't pop arguments since the same args are used by DOS_MOVE below
     35 
     36 	| search end of dirname of (old) path
     37 Lpath:	tstb	%a1@+
     38 	bnes	Lpath
     39 	subql	#1,%a1				| remove nul char
     40 
     41 	| add new name
     42 	lea	%sp@(8 + Lbufsz+Lnamoff),%a0	| new name (8: args on stack)
     43 Lname:	moveb	%a0@+,%a1@+
     44 	bnes	Lname
     45 	subql	#1,%a1				| remove nul char
     46 
     47 	| add new extension
     48 	lea	%sp@(8 + Lbufsz+Lextoff),%a0	| new ext (8: args on stack)
     49 Lext:	moveb	%a0@+,%a1@+
     50 	bnes	Lext
     51 
     52 	| we already have the arguments on stack
     53 	bsr	_C_LABEL(DOS_MOVE)
     54 
     55 	| version check of Human68k and error handlings are done in DOS_MOVE()
     56 
     57 	unlk	%a6				| restore stack
     58 	rts
     59 
     60 Lerr:	unlk	%a6
     61 	bra	CERROR
     62