| 1 | ; $Id: myldrGetFileName.asm,v 1.1 2000-12-11 06:33:00 bird Exp $
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| 2 | ;
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| 3 | ; myldrGetFileName2 - assembly helper for ldrGetFileName.
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| 4 | ; This makes ldrGetFileName work for filenames which
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| 5 | ; doesn't have a path, and return correct *ppachExt.
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| 6 | ;
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| 7 | ; Copyright (c) 2000 knut st. osmundsen
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| 8 | ;
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| 9 | ; Project Odin Software License can be found in LICENSE.TXT
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| 10 | ;
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| 11 | .386p
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| 12 |
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| 13 | ;
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| 14 | ; Include files
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| 15 | ;
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| 16 | include devsegdf.inc
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| 17 | include options.inc
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| 18 |
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| 19 | ;
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| 20 | ; Exported symbols
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| 21 | ;
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| 22 | public _ldrGetFileName2@12
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| 23 |
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| 24 | ;
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| 25 | ; Externs
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| 26 | ;
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| 27 | extrn _ldrGetFileName@12:PROC ; calltab entry
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| 28 |
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| 29 |
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| 30 | CODE32 segment
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| 31 | CODE32START label byte
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| 32 |
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| 33 | ;;
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| 34 | ; Assembly helper for ldrGetFileName.
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| 35 | ; This makes ldrGetFileName work for filenames which doesn't have a path.
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| 36 | ; @cproto ULONG LDRCALL ldrGetFileName2(PSZ pszFilename, PCHAR *ppachName, PCHAR *ppachExt);
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| 37 | ; @status completely implemented.
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| 38 | ; @author knut st. osmundsen
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| 39 | ; @remark This function relies heavily on the implementation of ldrGetFileName.
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| 40 | ; We help ldrGetFileName by initiating the register which hold the start of
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| 41 | ; the filename, edx, to the the correct value for filenames without path or
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| 42 | ; with only a driveletter specified.
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| 43 | _ldrGetFileName2@12 PROC NEAR
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| 44 | ASSUME ds:FLAT
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| 45 |
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| 46 | ;
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| 47 | ; Initiate the edx register incase there is no path or just a driveletter.
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| 48 | ;
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| 49 | mov edx, dword ptr [esp + 4]
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| 50 | cmp byte ptr [edx], 0
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| 51 | je lgfn_call
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| 52 | cmp byte ptr [edx+1], ':'
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| 53 | jne lgfn_call
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| 54 | inc edx
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| 55 |
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| 56 | lgfn_call:
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| 57 | ;
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| 58 | ; Re-push the arguments and call the real function.
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| 59 | ;
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| 60 | push dword ptr [esp + 0ch]
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| 61 | push dword ptr [esp + 0ch]
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| 62 | push dword ptr [esp + 0ch]
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| 63 | call near ptr FLAT:CALLTAB:_ldrGetFileName@12
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| 64 |
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| 65 | ;
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| 66 | ; Check if the extention pointer is pointer after the terminator ('\0') char.
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| 67 | ;
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| 68 | mov ecx, dword ptr [esp + 08h] ; fetch the ppachName parameter.
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| 69 | mov ecx, [ecx] ; fetch the name pointer returned by ldrGetFileName.
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| 70 | cmp byte ptr [ecx], 0 ; Check if no name (nor extention).
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| 71 | je lgfn_zeroppachExt ; Jump if no name.
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| 72 |
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| 73 | mov edx, dword ptr [esp + 0ch] ; fetch the ppachExt parameter.
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| 74 | mov edx, [edx] ; fetch the extention pointer returned by ldrGetFileName.
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| 75 | dec edx ; decrement the pointer.
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| 76 |
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| 77 | cmp edx, ecx ; check if the decremented pointer is legal.
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| 78 | jl lgfn_ret
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| 79 |
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| 80 | cmp byte ptr [edx], 0 ; If the pointer before *ppachExt is '\0' then *ppachExt should be NULL.
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| 81 | jne lgfn_ret ; Jump if *ppachExt is ok.
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| 82 |
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| 83 | lgfn_zeroppachExt:
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| 84 | mov edx, dword ptr [esp + 0ch] ; fetch the ppachExt parameter.
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| 85 | mov dword ptr [edx], 0 ; = NULL.
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| 86 |
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| 87 | lgfn_ret:
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| 88 | ret 0ch
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| 89 | _ldrGetFileName2@12 ENDP
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| 90 |
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| 91 | CODE32 ends
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| 92 |
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| 93 | END
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| 94 |
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| 95 |
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| 96 |
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