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#!/usr/bin/env python3
# Copyright 2019 The ChromiumOS Authors
# 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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