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// Copyright 2017 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#include <memory.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
char ptr[1024*1024*2+64] = {};
#define GUARDSIZE 32
void test_memset(int copySize, int offset) {
char *content = ptr + GUARDSIZE + offset;
char *guardBefore = content - GUARDSIZE;
char *guardAfter = content + copySize;
char guard = (char)rand();
for (int i = 0; i < GUARDSIZE; ++i) {
// Generate a guardband area around memory that should not change.
guardBefore[i] = (char)(guard ^ i);
guardAfter[i] = (char)(guard ^ i);
}
// Generate fill source data
char s = (char)(rand() ^ 0xF0);
memset(content, s, copySize);
for (int i = 0; i < copySize; ++i) {
if (content[i] != s) {
printf("test_memset(copySize=%d, offset=%d failed!\n", copySize, offset);
exit(1);
}
}
// Verify guardband area
for (int i = 0; i < GUARDSIZE; ++i) {
// Generate a guardband area around memory that should not change.
if (guardBefore[i] != (char)(guard ^ i)) {
printf("test_memset(copySize=%d, offset=%d failed! Pre-guardband area at i=%d overwritten!\n", copySize, offset, i);
exit(1);
}
if (guardAfter[i] != (char)(guard ^ i)) {
printf("test_memset(copySize=%d, offset=%d failed! Post-guardband area at i=%d overwritten!\n", copySize, offset, i);
exit(1);
}
}
}
void test_copysize(int copySize) {
for (int offset = 0; offset < 31; ++offset) {
test_memset(copySize, offset);
}
}
int main() {
srand(time(NULL));
for (int copySize = 0; copySize < 128; ++copySize) {
test_copysize(copySize);
}
for (int copySizeI = 128; copySizeI <= 1048576; copySizeI <<= 1) {
for (int copySizeJ = 1; copySizeJ <= 16; copySizeJ <<= 1) {
test_copysize(copySizeI | copySizeJ);
}
}
printf("OK.\n");
}
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