int uv_os_homedir(char* buffer, size_t* size) {
uv_passwd_t pwd;
size_t len;
int r;
/* Check if the HOME environment variable is set first. The task of
performing input validation on buffer and size is taken care of by
uv_os_getenv(). */
r = uv_os_getenv("HOME", buffer, size);
if (r != UV_ENOENT)
return r;
/* HOME is not set, so call uv__getpwuid_r() */
r = uv__getpwuid_r(&pwd);
if (r != 0) {
return r;
}
len = strlen(pwd.homedir);
if (len >= *size) {
*size = len + 1;
uv_os_free_passwd(&pwd);
return UV_ENOBUFS;
}
memcpy(buffer, pwd.homedir, len + 1);
*size = len;
uv_os_free_passwd(&pwd);
return 0;
}
static int luv_os_getenv(lua_State* L) {
const char* name = luaL_checkstring(L, 1);
size_t size = luaL_optinteger(L, 2, LUAL_BUFFERSIZE);
char *buff = malloc(size);
int ret = uv_os_getenv(name, buff, &size);
if (ret == 0) {
lua_pushlstring(L, buff, size);
ret = 1;
} else
ret = luv_error(L, ret);
free(buff);
return ret;
}
