| 1 | ; $Id: myldrGetFileName.asm,v 1.2 2001-02-23 02:57:54 bird Exp $
|
|---|
| 2 | ;
|
|---|
| 3 | ; myldrGetFileName2 - assembly helper for ldrGetFileName.
|
|---|
| 4 | ; This makes ldrGetFileName work for filenames which
|
|---|
| 5 | ; doesn't have a path, and return correct *ppachExt.
|
|---|
| 6 | ;
|
|---|
| 7 | ; Copyright (c) 2000 knut st. osmundsen
|
|---|
| 8 | ;
|
|---|
| 9 | ; Project Odin Software License can be found in LICENSE.TXT
|
|---|
| 10 | ;
|
|---|
| 11 | .386p
|
|---|
| 12 |
|
|---|
| 13 | ;
|
|---|
| 14 | ; Include files
|
|---|
| 15 | ;
|
|---|
| 16 | include devsegdf.inc
|
|---|
| 17 | include options.inc
|
|---|
| 18 |
|
|---|
| 19 | ;
|
|---|
| 20 | ; Exported symbols
|
|---|
| 21 | ;
|
|---|
| 22 | public _ldrGetFileName2@12
|
|---|
| 23 |
|
|---|
| 24 | ;
|
|---|
| 25 | ; Externs
|
|---|
| 26 | ;
|
|---|
| 27 | extrn _ldrGetFileName@12:PROC ; calltab entry
|
|---|
| 28 |
|
|---|
| 29 |
|
|---|
| 30 | CODE32 segment
|
|---|
| 31 | CODE32START label byte
|
|---|
| 32 |
|
|---|
| 33 | ;;
|
|---|
| 34 | ; Assembly helper for ldrGetFileName.
|
|---|
| 35 | ; This makes ldrGetFileName work for filenames which doesn't have a path.
|
|---|
| 36 | ; @cproto ULONG LDRCALL ldrGetFileName2(PSZ pszFilename, PCHAR *ppachName, PCHAR *ppachExt);
|
|---|
| 37 | ; @status completely implemented.
|
|---|
| 38 | ; @author knut st. osmundsen
|
|---|
| 39 | ; @remark This function relies heavily on the implementation of ldrGetFileName.
|
|---|
| 40 | ; We help ldrGetFileName by initiating the register which hold the start of
|
|---|
| 41 | ; the filename, edx, to the the correct value for filenames without path or
|
|---|
| 42 | ; with only a driveletter specified.
|
|---|
| 43 | _ldrGetFileName2@12 PROC NEAR
|
|---|
| 44 | ASSUME ds:FLAT
|
|---|
| 45 |
|
|---|
| 46 | ;
|
|---|
| 47 | ; Initiate the edx register incase there is no path or just a driveletter.
|
|---|
| 48 | ;
|
|---|
| 49 | mov edx, dword ptr [esp + 4]
|
|---|
| 50 | cmp byte ptr [edx], 0
|
|---|
| 51 | je lgfn_call
|
|---|
| 52 | cmp byte ptr [edx+1], ':'
|
|---|
| 53 | jne lgfn_call
|
|---|
| 54 | inc edx
|
|---|
| 55 |
|
|---|
| 56 | lgfn_call:
|
|---|
| 57 | ;
|
|---|
| 58 | ; Re-push the arguments and call the real function.
|
|---|
| 59 | ;
|
|---|
| 60 | push dword ptr [esp + 0ch]
|
|---|
| 61 | push dword ptr [esp + 0ch]
|
|---|
| 62 | push dword ptr [esp + 0ch]
|
|---|
| 63 | call _ldrGetFileName@12
|
|---|
| 64 |
|
|---|
| 65 | ;
|
|---|
| 66 | ; Check if the extention pointer is pointer after the terminator ('\0') char.
|
|---|
| 67 | ;
|
|---|
| 68 | mov ecx, dword ptr [esp + 08h] ; fetch the ppachName parameter.
|
|---|
| 69 | mov ecx, [ecx] ; fetch the name pointer returned by ldrGetFileName.
|
|---|
| 70 | cmp byte ptr [ecx], 0 ; Check if no name (nor extention).
|
|---|
| 71 | je lgfn_zeroppachExt ; Jump if no name.
|
|---|
| 72 |
|
|---|
| 73 | mov edx, dword ptr [esp + 0ch] ; fetch the ppachExt parameter.
|
|---|
| 74 | mov edx, [edx] ; fetch the extention pointer returned by ldrGetFileName.
|
|---|
| 75 | dec edx ; decrement the pointer.
|
|---|
| 76 |
|
|---|
| 77 | cmp edx, ecx ; check if the decremented pointer is legal.
|
|---|
| 78 | jl lgfn_ret
|
|---|
| 79 |
|
|---|
| 80 | cmp byte ptr [edx], 0 ; If the pointer before *ppachExt is '\0' then *ppachExt should be NULL.
|
|---|
| 81 | jne lgfn_ret ; Jump if *ppachExt is ok.
|
|---|
| 82 |
|
|---|
| 83 | lgfn_zeroppachExt:
|
|---|
| 84 | mov edx, dword ptr [esp + 0ch] ; fetch the ppachExt parameter.
|
|---|
| 85 | mov dword ptr [edx], 0 ; = NULL.
|
|---|
| 86 |
|
|---|
| 87 | lgfn_ret:
|
|---|
| 88 | ret 0ch
|
|---|
| 89 | _ldrGetFileName2@12 ENDP
|
|---|
| 90 |
|
|---|
| 91 | CODE32 ends
|
|---|
| 92 |
|
|---|
| 93 | END
|
|---|
| 94 |
|
|---|
| 95 |
|
|---|
| 96 |
|
|---|
