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