memcheck/tests/malloc2.c

   1
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4
   5 /* The original test driver machinery. */
   6 #define N_TEST_TRANSACTIONS 500
   7 #define N_TEST_ARR 2000
   8
   9 #define M_TEST_MALLOC 1000
  10
  11 void* test_arr[N_TEST_ARR];
  12
  13 unsigned myrandom(void)
  14 {
  15    /* Simple multiply-with-carry random generator. */
  16    static unsigned m_w = 11;
  17    static unsigned m_z = 13;
  18
  19    m_z = 36969 * (m_z & 65535) + (m_z >> 16);
  20    m_w = 18000 * (m_w & 65535) + (m_w >> 16);
  21    return (m_z << 16) + m_w;
  22 }
  23
  24 int main ( int argc, char** argv )
  25 {
  26    int i, j, k, nbytes;
  27    unsigned char* chp;
  28
  29    for (i = 0; i < N_TEST_ARR; i++)
  30       test_arr[i] = NULL;
  31
  32    for (i = 0; i < N_TEST_TRANSACTIONS; i++) {
  33       j = myrandom() % N_TEST_ARR;
  34       if (test_arr[j]) {
  35          free(test_arr[j]);
  36          test_arr[j] = NULL;
  37       } else {
  38          nbytes = 1 + myrandom() % M_TEST_MALLOC;
  39          if (myrandom()%64 == 32)
  40             nbytes *= 17;
  41          test_arr[j] = malloc( nbytes );
  42          chp = test_arr[j];
  43          for (k = 1; k < nbytes; k++)
  44             chp[k] = (unsigned char)(k + 99);
  45       }
  46    }
  47
  48    for (i = 0; test_arr[i] == NULL; i++) ;
  49    free(test_arr[i]);
  50    ((char*)test_arr[i])[0] = 0;
  51
  52    for (i = 0; i < N_TEST_ARR; i++) {
  53       if (test_arr[i]) {
  54          free(test_arr[i]);
  55          test_arr[i] = NULL;
  56       }
  57    }
  58
  59    return 0;
  60 }