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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 readlink.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* trace
*/
#define TB_TRACE_MODULE_NAME "readlink"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "prefix.h"
#ifndef TB_CONFIG_OS_WINDOWS
#include <unistd.h>
#endif
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
tb_int_t xm_os_readlink(lua_State *lua) {
tb_assert_and_check_return_val(lua, 0);
// get the path
tb_char_t const *path = luaL_checkstring(lua, 1);
tb_check_return_val(path, 0);
// is link?
#if defined(TB_CONFIG_OS_WINDOWS)
lua_pushnil(lua);
#else
tb_char_t srcpath[TB_PATH_MAXN];
tb_long_t size = readlink(path, srcpath, TB_PATH_MAXN);
if (size == TB_PATH_MAXN) {
tb_size_t maxn = TB_PATH_MAXN * 2;
tb_char_t *data = (tb_char_t *)tb_malloc(maxn);
if (data) {
tb_long_t size = readlink(path, data, maxn);
if (size > 0 && size < maxn) {
data[size] = '\0';
lua_pushstring(lua, data);
} else {
lua_pushnil(lua);
}
tb_free(data);
}
} else if (size >= 0 && size < TB_PATH_MAXN) {
srcpath[size] = '\0';
lua_pushstring(lua, srcpath);
} else {
lua_pushnil(lua);
}
#endif
return 1;
}
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