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# fortune.py -- chooses a random fortune, as the fortune(8) program in
# the BSD-games package does
#
# Copyright (c) 2010, Andrew M. Kuchling
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import struct, random, string
# C long variables are different sizes on 32-bit and 64-bit machines,
# so we have to measure how big they are on the machine where this is running.
LONG_SIZE = struct.calcsize('L')
is_64_bit = (LONG_SIZE == 8)
def get(filename):
"Select a random quotation, using a pregenerated .dat file"
# First, we open the .dat file, and read the header information.
# The C structure containing this info looks like:
## typedef struct { /* information table */
## #define VERSION 1
## unsigned long str_version; /* version number */
## unsigned long str_numstr; /* # of strings in the file */
## unsigned long str_longlen; /* length of longest string */
## unsigned long str_shortlen; /* length of shortest string */
## #define STR_RANDOM 0x1 /* randomized pointers */
## #define STR_ORDERED 0x2 /* ordered pointers */
## #define STR_ROTATED 0x4 /* rot-13'd text */
## unsigned long str_flags; /* bit field for flags */
## unsigned char stuff[4]; /* long aligned space */
## #define str_delim stuff[0] /* delimiting character */
## } STRFILE;
datfile = open(filename+'.dat', 'r')
data = datfile.read(5 * LONG_SIZE)
if is_64_bit:
v1, v2, n1, n2, l1, l2, s1, s2, f1, f2 = struct.unpack('!10L', data)
version = v1 + (v2 << 32)
numstr = n1 + (n2 << 32)
longlen = l1 + (l2 << 32)
shortlen = s1 + (s2 << 32)
flags = f1 + (f2 << 32)
else:
version, numstr, longlen, shortlen, flags = struct.unpack('5l', data)
delimiter = datfile.read(1)
datfile.read(3) # Throw away padding bytes
if is_64_bit: datfile.read(4) # 64-bit machines align to 8 bytes
# Pick a random number
r = random.randint(0, numstr)
datfile.seek(LONG_SIZE * r, 1) # Seek to the chosen pointer
data = datfile.read(LONG_SIZE * 2)
if is_64_bit:
s1, s2, e1, e2 = struct.unpack('!4L', data)
start, end = s1 + (s2 << 32), e1 + (e2 << 32)
else:
start, end = struct.unpack('!ll', data)
datfile.close()
file = open(filename, 'r')
file.seek(start)
quotation = file.read(end-start)
L=string.split(quotation, '\n')
while string.strip(L[-1]) == delimiter or string.strip(L[-1]) == "":
L=L[:-1]
return string.join(L, '\n')
if __name__ == '__main__':
import sys
if len(sys.argv) == 1:
print 'Usage: fortune.py <filename>'
sys.exit()
print get(sys.argv[1])
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