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72 lines
1.4 KiB
Python
72 lines
1.4 KiB
Python
#!/usr/bin/python
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"""
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Emulate the Output TTY (TTYOUT).
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"""
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from Globals import *
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# define various internal states
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DEVICE_NOT_READY = 0
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DEVICE_READY = 1
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TTYOUT_CHARS_PER_SECOND = 1000
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DEVICE_NOT_READY_CYCLES = int(CYCLES_PER_SECOND / TTYOUT_CHARS_PER_SECOND)
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# module-level state variables
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filename = None
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open_file = None
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open_file = 0
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cycle_count = 0
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state = DEVICE_NOT_READY
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def init():
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global filename, open_file, open_file, cycle_count, state
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filename = None
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open_file = None
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open_file = 0
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cycle_count = 0
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state = DEVICE_NOT_READY
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def mount(fname):
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global filename, open_file, open_file, cycle_count, state
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filename = fname
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open_file = open(filename, 'w')
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state = DEVICE_READY
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def dismount():
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global filename, open_file, open_file, cycle_count, state
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if open_file:
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open_file.close()
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filename = None
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open_file = None
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state = DEVICE_NOT_READY
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def write(char):
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global filename, open_file, open_file, cycle_count, state
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open_file.write(char)
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cycle_count = DEVICE_NOT_READY_CYCLES
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def ready():
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return (state != DEVICE_NOT_READY)
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def clear():
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global filename, open_file, open_file, cycle_count, state
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state = DEVICE_NOT_READY
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def tick(cycles):
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global filename, open_file, open_file, cycle_count, state
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if (state == DEVICE_NOT_READY):
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cycle_count -= cycles
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if cycle_count <= 0:
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state = DEVICE_READY
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