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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 getenvs.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* trace
*/
#define TB_TRACE_MODULE_NAME "getenvs"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "prefix.h"
#if defined(TB_CONFIG_OS_WINDOWS) && !defined(TB_COMPILER_LIKE_UNIX)
#include <windows.h>
#endif
/* //////////////////////////////////////////////////////////////////////////////////////
* macros
*/
// the separator
#if defined(TB_CONFIG_OS_WINDOWS) && !defined(TB_COMPILER_LIKE_UNIX)
#define XM_OS_ENV_SEP ';'
#else
#define XM_OS_ENV_SEP ':'
#endif
/* //////////////////////////////////////////////////////////////////////////////////////
* globals
*/
// the user environment
#if !defined(TB_CONFIG_OS_WINDOWS) || defined(TB_COMPILER_LIKE_UNIX)
extern tb_char_t **environ;
#endif
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
static tb_void_t xm_os_getenvs_trim(tb_char_t const **sstr, tb_char_t const **estr) {
tb_assert(sstr && estr && *sstr && *estr);
tb_char_t const *p = *sstr;
tb_char_t const *e = *estr;
// trim left
while (p < e && tb_isspace(*p)) {
p++;
}
// trim right
while (e > p && tb_isspace(*(e - 1))) {
e--;
}
// save trimmed string
*sstr = p;
*estr = e;
}
static tb_void_t xm_os_getenvs_process_line(lua_State *lua, tb_char_t const *line) {
tb_assert_and_check_return(lua && line);
tb_size_t n = tb_strlen(line);
tb_check_return(n > 0);
// find '=' separator
tb_char_t const *p = tb_strchr(line, '=');
tb_check_return(p);
// get key and value parts
tb_char_t const *key_start = line;
tb_char_t const *key_end = p;
tb_char_t const *value_start = p + 1;
tb_char_t const *value_end = line + n;
// trim key
xm_os_getenvs_trim(&key_start, &key_end);
if (key_start >= key_end) {
return;
}
// trim value
xm_os_getenvs_trim(&value_start, &value_end);
// get key and value lengths
tb_size_t key_len = key_end - key_start;
tb_size_t value_len = value_end > value_start ? value_end - value_start : 0;
// handle Windows-specific PATH conversion
tb_char_t const *final_key_start = key_start;
tb_size_t final_key_len = key_len;
#if defined(TB_CONFIG_OS_WINDOWS) && !defined(TB_COMPILER_LIKE_UNIX)
if (key_len == 4 && tb_strnicmp(key_start, "path", 4) == 0) {
// use "PATH" instead of "path"
static tb_char_t const PATH_UPPER[] = "PATH";
final_key_start = PATH_UPPER;
final_key_len = 4;
}
#endif
// set key-value pair in Lua table using pushlstring to avoid length limits
lua_pushlstring(lua, final_key_start, final_key_len);
lua_pushlstring(lua, value_start, value_len);
lua_rawset(lua, -3);
}
tb_int_t xm_os_getenvs(lua_State *lua) {
tb_assert_and_check_return_val(lua, 0);
// init table
lua_newtable(lua);
#if defined(TB_CONFIG_OS_WINDOWS) && !defined(TB_COMPILER_LIKE_UNIX)
tb_wchar_t const *p = (tb_wchar_t const *)GetEnvironmentStringsW();
if (p) {
tb_char_t *data = tb_null;
tb_size_t maxn = 0;
tb_char_t line[TB_PATH_MAXN];
tb_size_t n = 0;
while (*p) {
n = tb_wcslen(p);
if (n + 1 < tb_arrayn(line)) {
if (tb_wtoa(line, p, tb_arrayn(line)) >= 0) {
xm_os_getenvs_process_line(lua, line);
}
} else {
if (!data) {
maxn = n + 1;
data = (tb_char_t *)tb_malloc(maxn);
} else if (n >= maxn) {
maxn = n + TB_PATH_MAXN + 1;
data = (tb_char_t *)tb_ralloc(data, maxn);
}
tb_assert_and_check_break(data);
if (tb_wtoa(data, p, maxn) >= 0) {
xm_os_getenvs_process_line(lua, data);
}
}
p += n + 1;
}
if (data && data != line) {
tb_free(data);
}
data = tb_null;
}
#else
tb_char_t const **p = (tb_char_t const **)environ;
if (p) {
while (*p) {
xm_os_getenvs_process_line(lua, *p);
p++;
}
}
#endif
return 1;
}
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