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/*!A cross-platform build utility based on Lua
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright (C) 2015-present, Xmake Open Source Community.
*
* @author ruki
* @file sub.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "utf8.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
/* utf8.sub(s, i [, j])
*/
tb_int_t xm_utf8_sub(lua_State *lua) {
size_t len;
tb_char_t const* s = luaL_checklstring(lua, 1, &len);
lua_Integer i = luaL_checkinteger(lua, 2);
lua_Integer j = luaL_optinteger(lua, 3, -1);
tb_size_t sublen = 0;
tb_char_t const* sub = xm_utf8_sub_impl(s, len, (tb_long_t)i, (tb_long_t)j, &sublen);
if (sub) {
lua_pushlstring(lua, sub, sublen);
} else {
lua_pushliteral(lua, "");
}
return 1;
}
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