Function gmatch

third-party/lua-5.5.0/src/lstrlib.c:857–871

static int gmatch (lua_State *L) {
  size_t ls, lp;
  const char *s = luaL_checklstring(L, 1, &ls);
  const char *p = luaL_checklstring(L, 2, &lp);
  size_t init = posrelatI(luaL_optinteger(L, 3, 1), ls) - 1;
  GMatchState *gm;
  lua_settop(L, 2);  /* keep strings on closure to avoid being collected */
  gm = (GMatchState *)lua_newuserdatauv(L, sizeof(GMatchState), 0);
  if (init > ls)  /* start after string's end? */
    init = ls + 1;  /* avoid overflows in 's + init' */
  prepstate(&gm->ms, L, s, ls, p, lp);
  gm->src = s + init; gm->p = p; gm->lastmatch = NULL;
  lua_pushcclosure(L, gmatch_aux, 3);
  return 1;
}


static void add_s (MatchState *ms, luaL_Buffer *b, const char *s,