tools/testing/selftests/powerpc/stringloops/memcmp.c

   1 #include <malloc.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include "utils.h"
   5
   6 #define SIZE 256
   7 #define ITERATIONS 10000
   8
   9 int test_memcmp(const void *s1, const void *s2, size_t n);
  10
  11 /* test all offsets and lengths */
  12 static void test_one(char *s1, char *s2)
  13 {
  14         unsigned long offset, size;
  15
  16         for (offset = 0; offset < SIZE; offset++) {
  17                 for (size = 0; size < (SIZE-offset); size++) {
  18                         int x, y;
  19                         unsigned long i;
  20
  21                         y = memcmp(s1+offset, s2+offset, size);
  22                         x = test_memcmp(s1+offset, s2+offset, size);
  23
  24                         if (((x ^ y) < 0) &&    /* Trick to compare sign */
  25                                 ((x | y) != 0)) { /* check for zero */
  26                                 printf("memcmp returned %d, should have returned %d (offset %ld size %ld)\n", x, y, offset, size);
  27
  28                                 for (i = offset; i < offset+size; i++)
  29                                         printf("%02x ", s1[i]);
  30                                 printf("\n");
  31
  32                                 for (i = offset; i < offset+size; i++)
  33                                         printf("%02x ", s2[i]);
  34                                 printf("\n");
  35                                 abort();
  36                         }
  37                 }
  38         }
  39 }
  40
  41 static int testcase(void)
  42 {
  43         char *s1;
  44         char *s2;
  45         unsigned long i;
  46
  47         s1 = memalign(128, SIZE);
  48         if (!s1) {
  49                 perror("memalign");
  50                 exit(1);
  51         }
  52
  53         s2 = memalign(128, SIZE);
  54         if (!s2) {
  55                 perror("memalign");
  56                 exit(1);
  57         }
  58
  59         srandom(1);
  60
  61         for (i = 0; i < ITERATIONS; i++) {
  62                 unsigned long j;
  63                 unsigned long change;
  64
  65                 for (j = 0; j < SIZE; j++)
  66                         s1[j] = random();
  67
  68                 memcpy(s2, s1, SIZE);
  69
  70                 /* change one byte */
  71                 change = random() % SIZE;
  72                 s2[change] = random() & 0xff;
  73
  74                 test_one(s1, s2);
  75         }
  76
  77         srandom(1);
  78
  79         for (i = 0; i < ITERATIONS; i++) {
  80                 unsigned long j;
  81                 unsigned long change;
  82
  83                 for (j = 0; j < SIZE; j++)
  84                         s1[j] = random();
  85
  86                 memcpy(s2, s1, SIZE);
  87
  88                 /* change multiple bytes, 1/8 of total */
  89                 for (j = 0; j < SIZE / 8; j++) {
  90                         change = random() % SIZE;
  91                         s2[change] = random() & 0xff;
  92                 }
  93
  94                 test_one(s1, s2);
  95         }
  96
  97         return 0;
  98 }
  99
 100 int main(void)
 101 {
 102         return test_harness(testcase, "memcmp");
 103 }