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Add backwards compatibility wrappers for socket.unix

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Add backwards compatibility aliases "tcp" and "udp" for the recently renamed
"stream" and "dgram" functions, as well as a wrapper function and metatable
setup so that socket.unix() calls socket.unix.stream().
This commit is contained in:
Courtney Bane 2017-01-25 18:04:35 -06:00
parent 843fe9b65f
commit ea0064625b
1 changed files with 45 additions and 5 deletions
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50
src/unix.c
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@ -17,14 +17,54 @@ static const luaL_Reg mod[] = {
{NULL, NULL}
};
static void add_alias(lua_State *L, int index, const char *name, const char *target)
{
lua_getfield(L, index, target);
lua_setfield(L, index, name);
}
static int compat_socket_unix_call(lua_State *L)
{
/* Look up socket.unix.stream in the socket.unix table (which is the first
* argument). */
lua_getfield(L, 1, "stream");
/* Replace the stack entry for the socket.unix table with the
* socket.unix.stream function. */
lua_replace(L, 1);
/* Call socket.unix.stream, passing along any arguments. */
int n = lua_gettop(L);
lua_call(L, n-1, LUA_MULTRET);
/* Pass along the return values from socket.unix.stream. */
n = lua_gettop(L);
return n;
}
/*-------------------------------------------------------------------------*\
* Initializes module
\*-------------------------------------------------------------------------*/
int luaopen_socket_unix(lua_State *L)
{
int i;
lua_newtable(L);
for (i = 0; mod[i].name; i++) mod[i].func(L);
return 1;
}
int i;
lua_newtable(L);
int socket_unix_table = lua_gettop(L);
for (i = 0; mod[i].name; i++)
mod[i].func(L);
/* Add backwards compatibility aliases "tcp" and "udp" for the "stream" and
* "dgram" functions. */
add_alias(L, socket_unix_table, "tcp", "stream");
add_alias(L, socket_unix_table, "udp", "dgram");
/* Add a backwards compatibility function and a metatable setup to call it
* for the old socket.unix() interface. */
lua_pushcfunction(L, compat_socket_unix_call);
lua_setfield(L, socket_unix_table, "__call");
lua_pushvalue(L, socket_unix_table);
lua_setmetatable(L, socket_unix_table);
return 1;
}