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
  9int test_memcmp(const void *s1, const void *s2, size_t n);
 10
 11/* test all offsets and lengths */
 12static 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
 41static 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
100int main(void)
101{
102	return test_harness(testcase, "memcmp");
103}