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#!/usr/bin/env python3
# Copyright 2019 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import sys
def chargen(modulo, max_chars):
"""Generate a stream of characters on the console.
The stream is an ever incrementing pattern of characters from the
following set: 0..9A..Za..z.
Args:
modulo: an int, restart the pattern every modulo characters, if
modulo is non zero
max_chars: an int, stop printing after this number of characters if non
zero, if zero - print indefinitely
"""
base = '0'
c = base
counter = 0
while True:
sys.stdout.write(c)
counter = counter + 1
if (max_chars != 0) and (counter == max_chars):
sys.stdout.write('\n')
return
if modulo and ((counter % modulo) == 0):
c = base
continue
if c == 'z':
c = base
elif c == 'Z':
c = 'a'
elif c == '9':
c = 'A'
else:
c = '%c' % (ord(c) + 1)
def main(args):
'''Process command line arguments and invoke chargen if args are valid'''
modulo = 0
max_chars = 0
try:
if len(args) > 0:
modulo = int(args[0])
if len(args) > 1:
max_chars = int(args[1])
except ValueError:
sys.stderr.write('usage %s:'
"['seq_length' ['max_chars']]\n")
sys.exit(1)
try:
chargen(modulo, max_chars)
except KeyboardInterrupt:
print()
if __name__ == '__main__':
main(sys.argv[1:])
sys.exit(0)
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