| 1 | ; $Id: mytkExecPgm.asm,v 1.10 2000-02-23 16:53:04 bird Exp $
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| 2 | ;
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| 3 | ; mytkExecPgm - tkExecPgm overload
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| 4 | ;
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| 5 | ; Copyright (c) 2000 knut st. osmundsen (knut.stange.osmundsen@pmsc.no)
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| 6 | ;
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| 7 | ; Project Odin Software License can be found in LICENSE.TXT
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| 8 | ;
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| 9 | .386p
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| 10 |
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| 11 | ;
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| 12 | ; Include files
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| 13 | ;
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| 14 | include devsegdf.inc
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| 15 |
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| 16 | ;
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| 17 | ; Imported Functions
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| 18 | ;
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| 19 | extrn _g_tkExecPgm:PROC
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| 20 | extrn AcquireBuffer:PROC
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| 21 | extrn ReleaseBuffer:PROC
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| 22 | extrn QueryBufferSegmentOffset:PROC
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| 23 |
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| 24 | ; Scans strings until empy-string is reached.
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| 25 | ; input: bx:di
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| 26 | ; uses: nearly all (save bp)
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| 27 | ; return: cx size - CF clear
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| 28 | ; ax error- CF set
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| 29 | extrn _f_FuStrLenZ:PROC
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| 30 |
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| 31 | ; Stringlength
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| 32 | ; input: bx:di
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| 33 | ; uses: nearly all (save bp)
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| 34 | ; return: cx size - CF clear
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| 35 | ; ax error- CF set
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| 36 | extrn _f_FuStrLen:PROC
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| 37 |
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| 38 | ;memcpy
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| 39 | ;input: bx:si pointer to source
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| 40 | ; es:di pointer to target
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| 41 | ; cx count of bytes to copy
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| 42 | ;uses: nearly all (save bp), es, ds
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| 43 | ;return: success CF clear
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| 44 | ; failure CF set
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| 45 | extrn _f_FuBuff:PROC
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| 46 |
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| 47 | ;
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| 48 | ; Exported symbols
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| 49 | ;
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| 50 | public mytkExecPgm
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| 51 |
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| 52 |
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| 53 |
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| 54 | CODE32 SEGMENT
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| 55 |
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| 56 | ;;
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| 57 | ;
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| 58 | ; @returns same as tkExecPgm: eax, edx and carry flag
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| 59 | ; @param ax Exec flag
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| 60 | ; ds:dx Filename address. (String)
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| 61 | ; es:bx Environment address. (String)
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| 62 | ; di:si Argument address. (String)
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| 63 | ; @uses all - bp
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| 64 | ; @sketch Copy the filename and arguments into a buffer we
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| 65 | ; may modify later if this is a UNIX shellscript or
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| 66 | ; a PE-file started by pe.exe.
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| 67 | ; @status
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| 68 | ; @author knut st. osmundsen (knut.stange.osmundsen@pmsc.no)
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| 69 | ; @remark
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| 70 | ;
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| 71 | ; The buffer we are using is a C struct as follows.
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| 72 | ; struct Buffer
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| 73 | ; {
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| 74 | ; char szFilename[261]; /* offset 0 */
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| 75 | ; char achArg[1536-261]; /* offset 261 */
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| 76 | ; };
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| 77 | ;
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| 78 | mytkExecPgm PROC FAR
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| 79 | pBuffer = dword ptr -04h
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| 80 | SegBuffer = -08h
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| 81 | OffBuffer = -0Ch
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| 82 | cchFilename = dword ptr -10h
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| 83 | cchArgs = dword ptr -14h
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| 84 | ;usExecFlag = -18h
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| 85 | ;SegFilename = -1ch
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| 86 | ;OffFilename = -1eh
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| 87 | ;SegEnv = -20h
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| 88 | ;OffEnv = -22h
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| 89 | ;SegArg = -24h
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| 90 | ;OffArg = -26h
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| 91 |
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| 92 | ASSUME CS:CODE32, DS:NOTHING, SS:NOTHING
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| 93 | ; int 3
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| 94 | push ebp
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| 95 | mov ebp, esp
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| 96 | lea esp, [ebp + cchArgs]
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| 97 |
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| 98 | push eax
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| 99 | push ecx
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| 100 | push ds
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| 101 | push es
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| 102 | push edi
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| 103 |
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| 104 | ; parameter validations
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| 105 | mov ax, ds ; pointer to filename
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| 106 | cmp ax, 4
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| 107 | jb mytkExecPgm_CalltkExecPgm_X1
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| 108 |
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| 109 | ;
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| 110 | ; filename length
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| 111 | ;
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| 112 | mov ax, ds
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| 113 | mov es, ax
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| 114 | pushad
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| 115 | push es
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| 116 | push ds
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| 117 | mov bx, ds
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| 118 | mov di, dx ; es:di is now filename address (ds:dx).
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| 119 | push cs ; Problem calling far into the calltab segement.
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| 120 | call near ptr FLAT:_f_FuStrLen
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| 121 | movzx ecx, cx
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| 122 | mov [ebp+cchFilename], ecx
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| 123 | pop ds
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| 124 | pop es
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| 125 | popad
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| 126 | jc mytkExecPgm_CalltkExecPgm_X1; If the FuStrLen call failed we bail out!
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| 127 |
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| 128 | ;
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| 129 | ; if filename length is more that CCHMAXPATH then we don't do anything!.
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| 130 | ;
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| 131 | cmp [ebp+cchFilename], 260
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| 132 | jae mytkExecPgm_CalltkExecPgm_X1; length >= 260
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| 133 |
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| 134 | ;
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| 135 | ; args length
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| 136 | ; Note: the arguments are a series of ASCIIZs ended by an empty string (ie. '\0').
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| 137 | ;
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| 138 | pop edi
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| 139 | push edi
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| 140 | xor ecx, ecx
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| 141 | cmp di, 4 ; The argument might me a invalid pointer...
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| 142 | jb mytkExecPgm_CalltkExecPgm_1
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| 143 |
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| 144 | pushad
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| 145 | push es
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| 146 | push ds
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| 147 | mov bx, di ;
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| 148 | mov di, si ; bx:di -> arguments
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| 149 | push cs ; Problem calling far into the calltab segement.
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| 150 | call near ptr FLAT:_f_FuStrLenZ
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| 151 | movzx ecx, cx
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| 152 | mov [ebp+cchArgs], ecx
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| 153 | pop ds
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| 154 | pop es
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| 155 | popad
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| 156 | jc mytkExecPgm_CalltkExecPgm_X1
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| 157 |
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| 158 | mytkExecPgm_CalltkExecPgm_1:
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| 159 | mov ecx, [ebp+cchArgs]
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| 160 | add ecx, [ebp+cchFilename] ; filename
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| 161 | add ecx, 3 + 260 ; 260 = new argument from a scrip file or something.
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| 162 | ; 3 = two '\0's and a space after added argument.
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| 163 | cmp ecx, 1536 ; 1536 = Buffersize. FIXME! Define this!!!
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| 164 | jae mytkExecPgm_CalltkExecPgm_X1; jmp if argument + file + new file > buffer size
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| 165 |
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| 166 | ;
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| 167 | ; Aquire a buffer
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| 168 | ;
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| 169 | call AcquireBuffer
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| 170 | or eax, eax
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| 171 | jz mytkExecPgm_CalltkExecPgm_X1; Failed to get buffer.
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| 172 | mov [ebp+pBuffer], eax
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| 173 |
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| 174 | ;
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| 175 | ; Get Segment and offset for the buffer
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| 176 | ;
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| 177 | call QueryBufferSegmentOffset
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| 178 | mov cx, es
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| 179 | mov [ebp+OffBuffer], ax
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| 180 | mov [ebp+SegBuffer], es
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| 181 | test eax, 000570000h
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| 182 | jnz mytkExecPgm_CalltkExecPgm_X2
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| 183 |
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| 184 | ;
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| 185 | ; Copy filename to pBuffer.
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| 186 | ;
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| 187 | pushad
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| 188 | push es
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| 189 | push ds
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| 190 | mov di, ax ; es:di pBuffer
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| 191 | mov si, dx
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| 192 | mov bx, ds ; bx:si Filename pointer (input ds:dx)
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| 193 | mov ecx, [ebp+cchFilename]
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| 194 | push cs ; Problem calling far into the calltab segement.
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| 195 | call near ptr FLAT:_f_FuBuff
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| 196 | pop ds
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| 197 | pop es
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| 198 | popad
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| 199 | jc mytkExecPgm_CalltkExecPgm_X2
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| 200 |
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| 201 | ;
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| 202 | ; Copy Args to pBuffer + 261
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| 203 | ;
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| 204 | ; stack: edi, es, ds, ecx, eax
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| 205 | pop edi
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| 206 | push edi
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| 207 | add eax, 261 ; we'll use eax in the branch
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| 208 | cmp di, 4
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| 209 | jb mytkExecPgm_CalltkExecPgm_2
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| 210 | pushad
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| 211 | push es
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| 212 | push ds
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| 213 | mov ecx, [ebp+cchArgs]
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| 214 | mov bx, di ; ds:si -> arguments
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| 215 | mov di, ax ; es:di -> buffer + 261
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| 216 | push cs ; Problem calling far into the calltab segement.
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| 217 | call near ptr FLAT:_f_FuBuff
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| 218 | pop ds
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| 219 | pop es
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| 220 | popad
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| 221 | jc mytkExecPgm_CalltkExecPgm_X2
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| 222 | jmp mytkExecPgm_CalltkExecPgm_3
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| 223 |
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| 224 | mytkExecPgm_CalltkExecPgm_2:
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| 225 | mov word ptr es:[eax], 0 ; Terminate the empty string!
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| 226 |
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| 227 | ;
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| 228 | ; Restore variables pushed on the stack
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| 229 | ;
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| 230 | ; stack: edi, es, ds, ecx, eax
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| 231 | mytkExecPgm_CalltkExecPgm_3:
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| 232 | pop edi
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| 233 | pop es
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| 234 | pop ds
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| 235 | pop ecx
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| 236 | pop eax
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| 237 |
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| 238 | ;
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| 239 | ; Set new input parameters (call _g_tkExecPgm)
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| 240 | ;
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| 241 | ; ds:dx is to become SegBuffer:OffBuffer
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| 242 | ; di:si is to become SegBuffer:OffBuffer+261
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| 243 | ;
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| 244 | ; The some of the old values are stored on the stack (for the time being)
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| 245 | push ds
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| 246 | push edi
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| 247 | push esi
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| 248 |
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| 249 | mov di, [ebp+SegBuffer]
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| 250 | mov ds, di
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| 251 | mov si, [ebp+OffBuffer]
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| 252 | mov dx, si ; ds:dx SegBuffer:OffBuffer
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| 253 | add si, 261 ; di:si SegBuffer:OffBuffer+261
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| 254 |
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| 255 | ;
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| 256 | ; Call _g_tkExecPgm
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| 257 | ;
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| 258 | push cs ; Problem calling far into the calltab segement.
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| 259 | call near ptr FLAT:_g_tkExecPgm
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| 260 | pushfd
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| 261 |
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| 262 | ;
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| 263 | ; Release buffer
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| 264 | ;
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| 265 | push eax
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| 266 | mov eax, [ebp + pBuffer]
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| 267 | call ReleaseBuffer
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| 268 | mov [ebp + pBuffer], 0
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| 269 | pop eax
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| 270 |
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| 271 | ;
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| 272 | ; Return
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| 273 | ;
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| 274 | popfd
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| 275 | pop esi
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| 276 | pop edi
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| 277 | pop ds
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| 278 | leave
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| 279 | retf
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| 280 |
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| 281 | mytkExecPgm_CalltkExecPgm_X2:
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| 282 | ;
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| 283 | ; Release buffer
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| 284 | ;
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| 285 | mov eax, [ebp + pBuffer]
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| 286 | call ReleaseBuffer
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| 287 | mov [ebp + pBuffer], 0
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| 288 |
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| 289 | mytkExecPgm_CalltkExecPgm_X1:
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| 290 | pop edi
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| 291 | pop es
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| 292 | pop ds
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| 293 | pop ecx
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| 294 | pop eax
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| 295 |
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| 296 | mytkExecPgm_CalltkExecPgm:
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| 297 | push cs
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| 298 | call near ptr FLAT:_g_tkExecPgm
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| 299 | leave
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| 300 | retf
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| 301 | mytkExecPgm ENDP
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| 302 |
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| 303 |
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| 304 |
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| 305 | CODE32 ENDS
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| 306 |
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| 307 | if 0 ; alternate implementation.
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| 308 | mytkExecPgm PROC FAR
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| 309 | pBuffer = dword ptr -04h
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| 310 | SegBuffer = -08h
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| 311 | OffBuffer = -0Ch
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| 312 | cchFilename = -10h
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| 313 | cchArgs = -14h
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| 314 | usExecFlag = -18h
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| 315 | SegFilename = -1ch
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| 316 | OffFilename = -1eh
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| 317 | SegEnv = -20h
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| 318 | OffEnv = -22h
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| 319 | SegArg = -24h
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| 320 | OffArg = -26h
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| 321 |
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| 322 | ASSUME CS:CODE32, DS:NOTHING, SS:NOTHING
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| 323 | push ebp
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| 324 | mov ebp, esp
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| 325 | lea esp, [ebp + OffArg]
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| 326 |
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| 327 | ; save input parameters
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| 328 | mov [ebp + usExecFlag], ax
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| 329 | mov ax, es
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| 330 | mov [ebp + SegEnv], ax
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| 331 | mov [ebp + OffEnv], bx
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| 332 | mov [ebp + SegArg], di
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| 333 | mov [ebp + OffArg], si
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| 334 | mov ax, ds
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| 335 | mov [ebp + SegFilename], ax
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| 336 | mov [ebp + OffFilename], dx
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| 337 |
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| 338 | ; parameter validations
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| 339 | cmp ax, 4 ; pointer to filename
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| 340 | jb mytkExecPgm_CalltkExecPgm_X1
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| 341 |
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| 342 | ;
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| 343 | ; filename length
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| 344 | ;
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| 345 | mov bx, ax
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| 346 | mov di, dx ; bx:di is now filename address
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| 347 | push cs ; Problem calling far into the calltab segement.
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| 348 | call near ptr FLAT:_f_FuStrLen
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| 349 | jc mytkExecPgm_CalltkExecPgm_X1; If the FuStrLen call failed we bail out!
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| 350 |
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| 351 | ;
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| 352 | ; if filename length is more that CCHMAXPATH then we don't do anything!.
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| 353 | ;
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| 354 | cmp cx, 260
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| 355 | jae mytkExecPgm_CalltkExecPgm_X1; length >= 260
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| 356 | mov [ebp+cchFilename], cx
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| 357 |
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| 358 | ;
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| 359 | ; args length
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| 360 | ; Note: the arguments are a series of ASCIIZs ended by an empty string (ie. '\0').
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| 361 | ;
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| 362 | mov bx, [ebp+SegArg]
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| 363 | cmp bx, 4 ; The argument might me an NULL pointer
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| 364 | xor cx, cx
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| 365 | jb mytkExecPgm_CalltkExecPgm_1
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| 366 |
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| 367 | mov di, [ebp+OffArg] ; bx:di -> arguments
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| 368 | push cs ; Problem calling far into the calltab segement.
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| 369 | call near ptr FLAT:_f_FuStrLenZ
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| 370 | mov [ebp+cchArgs], cx
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| 371 | jc mytkExecPgm_CalltkExecPgm_X1
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| 372 |
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| 373 | mytkExecPgm_CalltkExecPgm_1:
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| 374 | add cx, [ebp+cchFilename] ; filename length
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| 375 | add cx, 3 + 260 ; 260 = new argument from a scrip file or something.
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| 376 | ; 3 = two '\0's and a space after added argument.
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| 377 | cmp ecx, 1536 ; 1536 = Buffersize. FIXME! Define this!!!
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| 378 | jae mytkExecPgm_CalltkExecPgm_X1; jmp if argument + file + new file > buffer size
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| 379 |
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| 380 | ;
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| 381 | ; Aquire a buffer
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| 382 | ;
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| 383 | call AcquireBuffer
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| 384 | mov [ebp+pBuffer], eax
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| 385 | or eax, eax
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| 386 | jz mytkExecPgm_CalltkExecPgm_X1; Failed to get buffer.
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| 387 |
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| 388 | ;
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| 389 | ; Get Segment and offset for the buffer
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| 390 | ;
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| 391 | call QueryBufferSegmentOffset
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| 392 | mov cx, es
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| 393 | mov [ebp+OffBuffer], ax
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| 394 | mov [ebp+SegBuffer], es
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| 395 | test eax, 000570000h
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| 396 | jnz mytkExecPgm_CalltkExecPgm_X2
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| 397 |
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| 398 | ;
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| 399 | ; Copy filename to pBuffer.
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| 400 | ;
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| 401 | mov di, ax ; es:di pBuffer
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| 402 | mov si, dx
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| 403 | mov bx, ds ; bx:si Filename pointer (input ds:dx)
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| 404 | mov cx, [ebp+cchFilename] ; cx = length of area to copy
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| 405 | push cs ; Problem calling far into the calltab segement.
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| 406 | call near ptr FLAT:_f_FuBuff
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| 407 | jc mytkExecPgm_CalltkExecPgm_X2
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| 408 |
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| 409 | ;
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| 410 | ; Copy Args to pBuffer + 261
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| 411 | ;
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| 412 | mov si, [ebp+SegArg]
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| 413 | cmp si, 4
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| 414 | jb mytkExecPgm_CalltkExecPgm_2
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| 415 | mov ds, si
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| 416 | mov si, [ebp+OffArg] ; ds:si -> arguments
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| 417 | mov di, [ebp+SegBuffer]
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| 418 | mov es, di
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| 419 | mov di, [ebp+OffBuffer]
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| 420 | add di, 261 ; es:di -> buffer + 261
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| 421 | mov cx, [ebp+cchArgs] ; cx = length of area to copy
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| 422 | push cs ; Problem calling far into the calltab segement.
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| 423 | call near ptr FLAT:_f_FuBuff
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| 424 | jc mytkExecPgm_CalltkExecPgm_X2
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| 425 | jmp mytkExecPgm_CalltkExecPgm_3
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| 426 |
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| 427 | mytkExecPgm_CalltkExecPgm_2:
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| 428 | mov word ptr es:[eax], 0 ; Terminate the empty string!
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| 429 |
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| 430 | ;
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| 431 | ; Set new input parameters (call _g_tkExecPgm)
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| 432 | ;
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| 433 | ; ds:dx is to become SegBuffer:OffBuffer
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| 434 | ; di:si is to become SegBuffer:OffBuffer+261
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| 435 | ;
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| 436 | mytkExecPgm_CalltkExecPgm_3:
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| 437 | mov di, [ebp+SegBuffer]
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| 438 | mov ds, di
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| 439 | mov si, [ebp+OffBuffer]
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| 440 | mov dx, si ; ds:dx SegBuffer:OffBuffer
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| 441 | add si, 261 ; di:si SegBuffer:OffBuffer+261
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| 442 | mov bx, [ebp+SegEnv]
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| 443 | mov es, bx
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| 444 | mov bx, [ebp+SegEnv]
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| 445 |
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| 446 | ;
|
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| 447 | ; Call _g_tkExecPgm
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| 448 | ;
|
|---|
| 449 | push cs ; Problem calling far into the calltab segement.
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| 450 | call near ptr FLAT:_g_tkExecPgm
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| 451 | pushfd
|
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| 452 |
|
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| 453 | ;
|
|---|
| 454 | ; Release buffer
|
|---|
| 455 | ;
|
|---|
| 456 | push eax
|
|---|
| 457 | mov eax, [ebp + pBuffer]
|
|---|
| 458 | call ReleaseBuffer
|
|---|
| 459 | mov [ebp + pBuffer], 0
|
|---|
| 460 | pop eax
|
|---|
| 461 |
|
|---|
| 462 | ;
|
|---|
| 463 | ; Return
|
|---|
| 464 | ;
|
|---|
| 465 | push [ebp + SegFilename]
|
|---|
| 466 | pop ds
|
|---|
| 467 | push [ebp + SegEnv]
|
|---|
| 468 | pop es
|
|---|
| 469 | popfd
|
|---|
| 470 | leave
|
|---|
| 471 | retf
|
|---|
| 472 |
|
|---|
| 473 | mytkExecPgm_CalltkExecPgm_X2:
|
|---|
| 474 | ;
|
|---|
| 475 | ; Release buffer
|
|---|
| 476 | ;
|
|---|
| 477 | mov eax, [ebp + pBuffer]
|
|---|
| 478 | call ReleaseBuffer
|
|---|
| 479 | mov [ebp + pBuffer], 0
|
|---|
| 480 |
|
|---|
| 481 | mytkExecPgm_CalltkExecPgm_X1:
|
|---|
| 482 | pop ds
|
|---|
| 483 |
|
|---|
| 484 | mytkExecPgm_CalltkExecPgm:
|
|---|
| 485 | push cs
|
|---|
| 486 | call near ptr FLAT:_g_tkExecPgm
|
|---|
| 487 | leave
|
|---|
| 488 | retf
|
|---|
| 489 | mytkExecPgm ENDP
|
|---|
| 490 |
|
|---|
| 491 | CODE32 ENDS
|
|---|
| 492 | endif
|
|---|
| 493 |
|
|---|
| 494 |
|
|---|
| 495 | END
|
|---|
| 496 |
|
|---|
