test-instr.c

/*
   american fuzzy lop++ - a trivial program to test the build
   --------------------------------------------------------

   Originally written by Michal Zalewski

   Copyright 2014 Google Inc. All rights reserved.
   Copyright 2019-2020 AFLplusplus Project. All rights reserved.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at:

     http://www.apache.org/licenses/LICENSE-2.0

 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char** argv) {

  char  buff[8];
  char* buf = buff;

  // we support command line parameter and stdin
  if (argc > 1) {

    buf = argv[1];
    printf("Input %s - ", buf);

  } else if (read(0, buf, sizeof(buf)) < 1) {

    printf("Hum?\n");
    return 1;

  }

  // we support three input cases (plus a 4th if stdin is used but there is no
  // input)
  if (buf[0] == '0')
    printf("Looks like a zero to me!\n");
  else if (buf[0] == '1')
    printf("Pretty sure that is a one!\n");
  else
    printf("Neither one or zero? How quaint!\n");

  return 0;

}