Verify that a binary input containing 4-byte (signed) integers are sorted ascending.

vrfsrtints.py

#!/usr/bin/env python

import sys
import array


BUFSIZE = 4096      # read 1000 * 4-byte (32-bit) numbers at a time
input = sys.stdin


largest = None
buf = input.read(BUFSIZE)
while buf:
    a = array.array('i', buf)
    for n in a:
        if a < largest:
            # found a new number that is larger than currently known largest number!
            print 0
            sys.exit(-1)
        else:
            largest = a
    buf = input.read(BUFSIZE)

# the input is sorted!
print 1
sys.exit(0)

$ ./vrfsrtints.py < sortedints 
1