static void
FileTempNum(Bool createTempFile, // IN:
uint32 *var) // IN/OUT:
{
ASSERT(var);
*var += (FileSimpleRandom() >> 8) & 0xFF;
*var = (*var & ~0x1) | (createTempFile ? 1 : 0);
}
static char *
FileCreateSafeTmpDir(uid_t userId, // IN:
const char *userName, // IN:
const char *baseTmpDir) // IN:
{
static const int MAX_DIR_ITERS = 250;
int curDirIter = 0;
char *tmpDir = NULL;
while (TRUE) {
/*
* We use a random number that makes it more likely that we will create
* an unused name than if we had simply tried suffixes in numeric order.
*/
tmpDir = Str_Asprintf(NULL, "%s%s%s-%s-%u", baseTmpDir, DIRSEPS,
PRODUCT_GENERIC_NAME_LOWER, userName,
FileSimpleRandom());
if (!tmpDir) {
Warning("%s: Out of memory error.\n", __FUNCTION__);
break;
}
if (FileAcceptableSafeTmpDir(tmpDir, userId)) {
break;
}
if (++curDirIter > MAX_DIR_ITERS) {
Warning("%s: Failed to create a safe temporary directory, path "
"\"%s\". The maximum number of attempts was exceeded.\n",
__FUNCTION__, tmpDir);
free(tmpDir);
tmpDir = NULL;
break;
}
free(tmpDir);
tmpDir = NULL;
}
return tmpDir;
}
