125 lines
1.7 KiB
Plaintext
125 lines
1.7 KiB
Plaintext
;Reads a string, checks if it is a valid 8.3 file name, converts it into FAT formatting, and prints it.
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fileify:
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;Read a string
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mov di, buffer
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mov al, 0xff
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mov ah, 0x3
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int 0x21
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;Set SI and DI
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mov si, buffer
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mov di, .file
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;Initialise the name with spaces
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mov cx, 0xb
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mov al, 0x20
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rep stosb
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sub di, 0xb
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;Initialise the length counter for the main part of the name
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mov bl, 0x8
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.nameloop:
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;Load a character
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lodsb
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;Check for a period
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cmp al, 0x2e
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je .initext
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;Check for everything else and convert to upper case
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call .checkconv
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jmp .nameloop
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.initext:
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;Set DI and initialise the length counter for the extension
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mov bl, 0x3
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mov di, .file+0x8
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.extloop:
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;Load a character
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lodsb
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;Check for a period
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push ax
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cmp al, 0x2e
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je .error
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pop ax
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;Check for everything else and convert to upper case
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call .checkconv
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jmp .extloop
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.error:
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pop ax
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mov si, .errormsg
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mov ah, 0x2
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int 0x21
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jmp .done
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.print:
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pop ax
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mov si, .file
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mov ah, 0x2
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int 0x21
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.done:
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ret
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.file times 0xc db 0x0
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.errormsg db "Invalid file name", 0x0
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.checkconv:
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;Check for the string end
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cmp al, 0x0
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je .print
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;Check for the length limit
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cmp bl, 0x0
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je .error
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;Check for invalid characters
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cmp al, 0x22
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je .error
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cmp al, 0x2a
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jl .contcheck1
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cmp al, 0x2c
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jg .contcheck1
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jmp .error
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.contcheck1:
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cmp al, 0x2f
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je .error
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cmp al, 0x3a
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jl .contcheck2
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cmp al, 0x3f
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jg .contcheck2
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jmp .error
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.contcheck2:
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cmp al, 0x5b
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jl .contcheck3
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cmp al, 0x5d
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jg .contcheck3
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jmp .error
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.contcheck3:
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cmp al, 0x7c
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je .error
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;Find and convert lower case letters to upper case
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;Check for lower case
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cmp al, 0x61
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jl .storech
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cmp al, 0x7a
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jg .storech
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;Convert lower to upper case
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sub al, 0x20
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.storech:
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;Store the character
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stosb
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;Increase the counter
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dec bl
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ret
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