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Power-Programmierung
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1994-02-17
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-- Random Access File Operations --
-- plus directory functions --
constant M_SEEK = 19,
M_WHERE = 20,
M_DIR = 22,
M_CURRENT_DIR = 23
type file_number(integer f)
return f >= 0
end type
type file_position(integer p)
return p >= -1
end type
global function seek(file_number fn, file_position pos)
-- seeks to a byte position in the file,
-- or to end of file if pos is -1
return machine_func(M_SEEK, {fn, pos})
end function
global function where(file_number fn)
-- returns the current byte position in the file
return machine_func(M_WHERE, fn)
end function
global constant
D_NAME = 1,
D_ATTRIBUTES = 2,
D_SIZE = 3,
D_YEAR = 4,
D_MONTH = 5,
D_DAY = 6,
D_HOUR = 7,
D_MINUTE = 8,
D_SECOND = 9
global function dir(sequence name)
-- returns directory information, given the name
-- of a file or directory. Format returned is:
-- {
-- {"name1", attributes, size, year, month, day, hour, minute, second},
-- {"name2 , ... },
-- }
return machine_func(M_DIR, name)
end function
global function current_dir()
-- returns name of current working directory
return machine_func(M_CURRENT_DIR, 0)
end function