infer_clone/infer/tests/codetoanalyze/c/bufferoverrun/arith.c

/*
 * Copyright (c) 2017 - present Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

void modulo_signed_Bad(int i) {
  char arr[5];
  arr[i % 5] = 123;
}

void modulo_signed_Good(int i) {
  char arr[5];
  if (i >= 0) {
    arr[i % 5] = 123;
  }
}

void modulo_signed_neg_Bad(int i) {
  char arr[5];
  arr[i % -5] = 123;
}

void modulo_signed_neg_Good(int i) {
  char arr[5];
  if (i >= 0) {
    arr[i % -5] = 123;
  }
}

void modulo_signed_Good2(int i) {
  char arr[5];
  int j = i % 5;
  if (j >= 0) {
    arr[j] = 123;
  }
}

void modulo_unsigned_Good(unsigned int i) {
  char arr[5];
  arr[i % 5] = 123;
}

void modulo_signed_var_Bad_FN(unsigned int len, int i) {
  char arr[len];
  arr[i % len] = 123;
}

void modulo_unsigned_var_Good(unsigned int len, unsigned int i) {
  char arr[len];
  arr[i % len] = 123;
}

unsigned int modulo_unsigned(unsigned int a, unsigned int b) { return a % b; }

void modulo_call_Good(unsigned int len, unsigned int i) {
  char arr[len];
  arr[modulo_unsigned(i, len)] = 123;
}

int modulo_signed(int a, int b) { return a % b; }

void modulo_call_Bad_FN(unsigned int len, int i) {
  char arr[len];
  arr[modulo_signed(i, len)] = 123;
}