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static char _clar_path[4096];

static int

is_valid_tmp_path(const char *path)

{

STAT_T st;

if (stat(path, &st) != 0)

return 0;

if (!S_ISDIR(st.st_mode))

return 0;

return (access(path, W_OK) == 0);

}

static int

find_tmp_path(char *buffer, size_t length)

{

#ifndef _WIN32

static const size_t var_count = 5;

static const char *env_vars[] = {

"CLAR_TMP", "TMPDIR", "TMP", "TEMP", "USERPROFILE"

};

size_t i;

for (i = 0; i < var_count; ++i) {

const char *env = getenv(env_vars[i]);

if (!env)

continue;

if (is_valid_tmp_path(env)) {

strncpy(buffer, env, length);

return 0;

}

}

/* If the environment doesn't say anything, try to use /tmp */

if (is_valid_tmp_path("/tmp")) {

strncpy(buffer, "/tmp", length);

return 0;

}

#else

DWORD env_len = GetEnvironmentVariable("CLAR_TMP", buffer, (DWORD)length);

if (env_len > 0 && env_len < (DWORD)length)

return 0;

if (GetTempPath((DWORD)length, buffer))

return 0;

#endif

/* This system doesn't like us, try to use the current directory */

if (is_valid_tmp_path(".")) {

strncpy(buffer, ".", length);

return 0;

}

return -1;

}

static void clar_unsandbox(void)

{

if (_clar_path[0] == '\0')

return;

cl_must_pass(chdir(".."));

fs_rm(_clar_path);

}

static int build_sandbox_path(void)

{

#ifdef CLAR_TMPDIR

const char path_tail[] = CLAR_TMPDIR "_XXXXXX";

#else

const char path_tail[] = "clar_tmp_XXXXXX";

#endif

size_t len;

if (find_tmp_path(_clar_path, sizeof(_clar_path)) < 0)

return -1;

len = strlen(_clar_path);

#ifdef _WIN32

{ /* normalize path to POSIX forward slashes */

size_t i;

for (i = 0; i < len; ++i) {

if (_clar_path[i] == '\\')

_clar_path[i] = '/';

}

}

#endif

if (_clar_path[len - 1] != '/') {

_clar_path[len++] = '/';

}

strncpy(_clar_path + len, path_tail, sizeof(_clar_path) - len);

#if defined(__MINGW32__)

if (_mktemp(_clar_path) == NULL)

return -1;

if (mkdir(_clar_path, 0700) != 0)

return -1;

#elif defined(_WIN32)

if (_mktemp_s(_clar_path, sizeof(_clar_path)) != 0)

return -1;

if (mkdir(_clar_path, 0700) != 0)

return -1;

#else

if (mkdtemp(_clar_path) == NULL)

return -1;

#endif

return 0;

}

static int clar_sandbox(void)

{

if (_clar_path[0] == '\0' && build_sandbox_path() < 0)

return -1;

if (chdir(_clar_path) != 0)

return -1;

return 0;

}

const char *clar_sandbox_path(void)

{

return _clar_path;

}