Addresses #1508 Added test that shows snprintf problem

git-svn-id: file:///svn/toku/tokudb@9701 c7de825b-a66e-492c-adef-691d508d4ae1

linux/tests/test-snprintf.c

+../../windows/tests/test-snprintf.c
\ No newline at end of file

windows/tests/test-snprintf.c

+/* -*- mode: C; c-basic-offset: 4 -*- */
+#ident "Copyright (c) 2007, 2008 Tokutek Inc.  All rights reserved."
+
+#define _GNU_SOURCE
+#include "toku_portability.h"
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <assert.h>
+#include "toku_os.h"
+
+void
+check_snprintf(int i) {
+    char buf_before[8];
+    char target[8];
+    char buf_after[8];
+    memset(target, 0xFF, sizeof(target));
+    memset(buf_before, 0xFF, sizeof(buf_before));
+    memset(buf_after, 0xFF, sizeof(buf_after));
+    int64_t n = 1;
+    
+    int j;
+    for (j = 0; j < i; j++) n *= 10;
+
+    int bytes = snprintf(target, sizeof target, "%"PRId64, n);
+    assert(bytes==i+1);
+    if (bytes>=sizeof target) {
+        //Overflow prevented by snprintf
+        assert(target[sizeof target - 1] == '\0');
+        assert(strlen(target)==sizeof target-1);
+    }
+    else {
+        assert(target[bytes] == '\0');
+        assert(strlen(target)==bytes);
+    }
+}
+
+
+int main(void) {
+    int i;
+    for (i = 0; i < 8; i++) {
+        check_snprintf(i);
+    }
+    return 0;
+}
+