79 lines
1.6 KiB
NASM
79 lines
1.6 KiB
NASM
; file helper routines
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; get a list of FXF files on disk 0
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; inputs:
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; none
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; outputs:
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; r0: pointer to file name buffer
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; r1: number of files
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get_fxf_files:
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push r2
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push r31
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; allocate a 341 byte array for the file name buffer
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mov r0, 341
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call allocate_memory
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cmp r0, 0
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ifz jmp allocate_error
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mov [all_file_list_ptr], r0
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; read the list of files into the buffer
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mov r1, 0
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call ryfs_get_file_list
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mov [number_of_all_files], r0
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; allocate a 341 byte buffer for the FXF file name buffer
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mov r0, 341
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call allocate_memory
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cmp r0, 0
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ifz jmp allocate_error
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mov [fxf_file_list_ptr], r0
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mov r0, [all_file_list_ptr]
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mov r1, [fxf_file_list_ptr]
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mov [number_of_fxf_files], 0
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mov r31, [number_of_all_files]
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get_fxf_files_loop:
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push r0
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push r1
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add r0, 8
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mov r1, fxf_ext
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mov r2, 3
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call compare_memory_bytes
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ifnz jmp get_fxf_files_loop_not_fxf
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inc [number_of_fxf_files]
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pop r1
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pop r0
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mov r2, 11
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call copy_memory_bytes
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add r0, 11
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add r1, 11
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loop get_fxf_files_loop
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jmp get_fxf_files_end
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get_fxf_files_loop_not_fxf:
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pop r1
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pop r0
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add r0, 11
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loop get_fxf_files_loop
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get_fxf_files_end:
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; free the "all files" buffer
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mov r0, [all_file_list_ptr]
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call free_memory
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; return pointer to file name buffer and number of files
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mov r0, [fxf_file_list_ptr]
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mov r1, [number_of_fxf_files]
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pop r31
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pop r2
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ret
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; all files
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all_file_list_ptr: data.32 0
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number_of_all_files: data.32 0
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; FXF files only
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fxf_file_list_ptr: data.32 0
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number_of_fxf_files: data.32 0
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fxf_ext: data.str "fxf"
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