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50 lines
1.9 KiB
Plaintext
50 lines
1.9 KiB
Plaintext
; C02 Module direct Assembly Language Routines for run6502 emulator
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; This is the reference implementation of the direct module
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; Requires external function FSCMD and FSDRVN (fileio.h02)
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SUBROUTINE DIRECT
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;getcwd(drv, &dir) - Get Current Directory
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;Args: A = Drive Identifier
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; Y,X = Pointer to String
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;Returns: A = Result (0 = Success, $FF = Failure)
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; Y = Error Code (0 = None)
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GETCWD: JSR FSDRVN ;Convert Drive Letter to Drive Number
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BCS .DRVERR ;If Invalid Return Error
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LDA #'T' ;Set Command to GETCWD
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.FSCMDX JSR FSCMD ;Execute Command
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TXA ;Return Length of Name
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.DRVERR RTS
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;chdir(drv, &dir) - Get Current Directory
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;Args: A = Drive Identifier
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; Y,X = Pointer to String
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;Returns: A = Result (0 = Succes, $FF = Failure)
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; Y = Error Code (0 = None)
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CHDIR: JSR FSDRVN ;Convert Drive Letter to Drive Number
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BCS .DRVERR ;If Invalid Return Error
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LDA #'U' ;Set Command to GETCWD
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BNE .FSCMDX ;Execute Command and Return Result
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;rmdir(drv, &dir) - Create Directory
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;Args: A = Drive Identifier
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; Y,X = Address of Directory Name String
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;Returns: A = Error Code (0 = None)
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RMDIR: SEC ;Set Mode to RMDIR
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BCS .MRDIR ;Execute MKRMDIR and Return Result
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;mkdir(drv, &dir) - Create Directory
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;Args: A = Drive Identifier
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; Y,X = Address of Directory Name String
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;Returns: A = Error Code (0 = None)
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MKDIR: CLC ;Set Mode to MKDIR
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.MRDIR PHP ;Save Status Register
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JSR FSDRVN ;Convert Drive Letter to Drive Number
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BCS .DRVERR ;If Invalid Return Error
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PLP ;Restore Status Register
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LDA #'X' ;Set Command to MKRMDIR
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BNE .FSCMDX ;Execute Command and Return Result
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.PLAERR PLP ;Restore Status Register
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RTS ;and Return
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