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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])