| 1 | ; File name : Directory.asm
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| 2 | ; Project name : Assembly Library
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| 3 | ; Created date : 3.9.2010
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| 4 | ; Last update : 6.9.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Functions for accessing directories.
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| 7 |
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| 8 |
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| 9 | ; Section containing code
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| 10 | SECTION .text
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| 11 |
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| 12 | ;--------------------------------------------------------------------
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| 13 | ; Directory_GetDiskTransferAreaAddressToDSSI
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| 14 | ; Parameters:
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| 15 | ; Nothing
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| 16 | ; Returns:
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| 17 | ; DS:SI: Ptr to DTA
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| 18 | ; Corrupts registers:
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| 19 | ; AX
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| 20 | ;--------------------------------------------------------------------
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| 21 | ALIGN JUMP_ALIGN
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| 22 | Directory_GetDiskTransferAreaAddressToDSSI:
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| 23 | push es
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| 24 | push bx
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| 25 |
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| 26 | mov ah, GET_DISK_TRANSFER_AREA_ADDRESS
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| 27 | int DOS_INTERRUPT_21h
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| 28 | push es
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| 29 | pop ds
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| 30 | mov si, bx
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| 31 |
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| 32 | pop bx
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| 33 | pop es
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| 34 | ret
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| 35 |
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| 36 |
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| 37 | ;--------------------------------------------------------------------
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| 38 | ; Directory_ChangeToPathFromDSSI
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| 39 | ; Parameters:
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| 40 | ; DS:SI: Ptr to NULL terminated path (max 64 bytes)
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| 41 | ; Returns:
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| 42 | ; AX: Error code
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| 43 | ; CF: Cleared if success
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| 44 | ; Set if error
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| 45 | ; Corrupts registers:
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| 46 | ; Nothing
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| 47 | ;--------------------------------------------------------------------
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| 48 | ALIGN JUMP_ALIGN
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| 49 | Directory_ChangeToPathFromDSSI:
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| 50 | xchg dx, si ; Path now in DS:DX
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| 51 | mov ah, SET_CURRENT_DIRECTORY
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| 52 | int DOS_INTERRUPT_21h
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| 53 | xchg si, dx
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| 54 | ret
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| 55 |
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| 56 |
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| 57 | ;--------------------------------------------------------------------
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| 58 | ; Directory_WriteCurrentPathToDSSI
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| 59 | ; Parameters:
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| 60 | ; DS:SI: Ptr to destination buffer (64 bytes)
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| 61 | ; Returns:
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| 62 | ; AX: Error code
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| 63 | ; CF: Cleared if success
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| 64 | ; Set if error
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| 65 | ; Corrupts registers:
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| 66 | ; Nothing
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| 67 | ;--------------------------------------------------------------------
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| 68 | ALIGN JUMP_ALIGN
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| 69 | Directory_WriteCurrentPathToDSSI:
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| 70 | push dx
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| 71 |
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| 72 | xor dx, dx ; Default drive (00h)
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| 73 | mov ah, GET_CURRENT_DIRECTORY
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| 74 | int DOS_INTERRUPT_21h
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| 75 |
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| 76 | pop dx
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| 77 | ret
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| 78 |
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| 79 |
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| 80 | ;--------------------------------------------------------------------
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| 81 | ; Directory_GetMatchCountToAXforSearchStringInDSSIwithAttributesInCX
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| 82 | ; Parameters:
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| 83 | ; CX: File attributes
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| 84 | ; DS:SI: NULL terminated search string (may include path and wildcards)
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| 85 | ; Returns:
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| 86 | ; AX: Number of matching files found
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| 87 | ; Corrupts registers:
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| 88 | ; Nothing
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| 89 | ;--------------------------------------------------------------------
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| 90 | ALIGN JUMP_ALIGN
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| 91 | Directory_GetMatchCountToAXforSearchStringInDSSIwithAttributesInCX:
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| 92 | push dx
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| 93 | xor dx, dx ; Zero counter
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| 94 | call Directory_UpdateDTAForFirstMatchForDSSIwithAttributesInCX
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| 95 | jc SHORT .NoMoreFilesFound
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| 96 | ALIGN JUMP_ALIGN
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| 97 | .FindNextFile:
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| 98 | inc dx ; Increment match count
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| 99 | call Directory_UpdateDTAForNextMatchUsingPreviousParameters
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| 100 | jnc SHORT .FindNextFile
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| 101 | ALIGN JUMP_ALIGN
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| 102 | .NoMoreFilesFound:
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| 103 | xchg ax, dx ; Match count to AX
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| 104 | pop dx
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| 105 | ret
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| 106 |
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| 107 |
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| 108 | ;--------------------------------------------------------------------
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| 109 | ; Directory_UpdateDTAForFirstMatchForDSSIwithAttributesInCX
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| 110 | ; Parameters:
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| 111 | ; CX: File attributes
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| 112 | ; DS:SI: NULL terminated search string (may include path and wildcards)
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| 113 | ; Returns:
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| 114 | ; AX: Error code
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| 115 | ; CF: Cleared if success
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| 116 | ; Set if error
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| 117 | ; Disk Transfer Area (DTA) will be updated
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| 118 | ; Corrupts registers:
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| 119 | ; Nothing
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| 120 | ;--------------------------------------------------------------------
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| 121 | ALIGN JUMP_ALIGN
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| 122 | Directory_UpdateDTAForFirstMatchForDSSIwithAttributesInCX:
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| 123 | xchg dx, si ; Search string now in DS:DX
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| 124 | mov ax, FIND_FIRST_MATCHING_FILE<<8 ; Zero AL (special flag for APPEND)
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| 125 | int DOS_INTERRUPT_21h
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| 126 | xchg si, dx
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| 127 | ret
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| 128 |
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| 129 |
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| 130 | ;--------------------------------------------------------------------
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| 131 | ; Directory_UpdateDTAForNextMatchUsingPreviousParameters
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| 132 | ; Parameters:
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| 133 | ; Nothing (Parameters from previous call to
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| 134 | ; Directory_UpdateDTAForFirstMatchForDSSIwithAttributesInCX are used)
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| 135 | ; Returns:
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| 136 | ; AX: Error code
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| 137 | ; CF: Cleared if success
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| 138 | ; Set if error
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| 139 | ; Disk Transfer Area (DTA) will be updated
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| 140 | ; Corrupts registers:
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| 141 | ; Nothing
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| 142 | ;--------------------------------------------------------------------
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| 143 | ALIGN JUMP_ALIGN
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| 144 | Directory_UpdateDTAForNextMatchUsingPreviousParameters:
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| 145 | mov ah, FIND_NEXT_MATCHING_FILE
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| 146 | int DOS_INTERRUPT_21h
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| 147 | ret
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