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https://github.com/rzzzwilson/pymlac.git
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62 lines
1.3 KiB
Python
62 lines
1.3 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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class TtyOut(object):
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def __init__(self):
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self.filename = None
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self.open_file = None
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self.cycle_count = 0
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self.state = DEVICE_NOT_READY
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def mount(self, fname):
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self.filename = fname
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self.open_file = open(self.filename, 'w')
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self.state = DEVICE_READY
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def dismount(self):
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if self.open_file:
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self.open_file.close()
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self.filename = None
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self.open_file = None
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self.state = DEVICE_NOT_READY
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def write(self, char):
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if self.open_file:
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self.open_file.write(char)
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self.cycle_count = DEVICE_NOT_READY_CYCLES
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def ready(self):
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return (self.state != DEVICE_NOT_READY)
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def clear(self):
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self.state = DEVICE_NOT_READY
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def tick(self, cycles):
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if (self.state == DEVICE_NOT_READY):
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self.cycle_count -= cycles
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if self.cycle_count <= 0:
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self.state = DEVICE_READY
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