123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172 |
- /*
- * Copyright 2016-present Facebook, Inc.
- *
- * 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.
- */
- #include <folly/portability/Stdlib.h>
- #ifdef _WIN32
- #include <cstring>
- #include <errno.h>
- #include <folly/portability/Fcntl.h>
- #include <folly/portability/SysStat.h>
- #include <folly/portability/Windows.h>
- extern "C" {
- char* mktemp(char* tn) {
- return _mktemp(tn);
- }
- // While yes, this is for a directory, due to this being windows,
- // a file and directory can't have the same name, resulting in this
- // still working just fine.
- char* mkdtemp(char* tn) {
- char* ptr = nullptr;
- auto len = strlen(tn);
- int ret = 0;
- do {
- strcpy(tn + len - 6, "XXXXXX");
- ptr = mktemp(tn);
- if (ptr == nullptr || *ptr == '\0') {
- return nullptr;
- }
- ret = mkdir(ptr, 0700);
- if (ret != 0 && errno != EEXIST) {
- return nullptr;
- }
- } while (ret != 0);
- return tn;
- }
- int mkstemp(char* tn) {
- char* ptr = nullptr;
- auto len = strlen(tn);
- int ret = 0;
- do {
- strcpy(tn + len - 6, "XXXXXX");
- ptr = mktemp(tn);
- if (ptr == nullptr || *ptr == '\0') {
- return -1;
- }
- ret = open(ptr, O_RDWR | O_EXCL | O_CREAT, S_IRUSR | S_IWUSR);
- if (ret == -1 && errno != EEXIST) {
- return -1;
- }
- } while (ret == -1);
- return ret;
- }
- char* realpath(const char* path, char* resolved_path) {
- // I sure hope the caller gave us _MAX_PATH space in the buffer....
- return _fullpath(resolved_path, path, _MAX_PATH);
- }
- int setenv(const char* name, const char* value, int overwrite) {
- if (overwrite == 0 && getenv(name) != nullptr) {
- return 0;
- }
- if (*value != '\0') {
- auto e = _putenv_s(name, value);
- if (e != 0) {
- errno = e;
- return -1;
- }
- return 0;
- }
- // We are trying to set the value to an empty string, but
- // _putenv_s deletes entries if the value is an empty string,
- // and just calling SetEnvironmentVariableA doesn't update
- // _environ, so we have to do these terrible things.
- if (_putenv_s(name, " ") != 0) {
- errno = EINVAL;
- return -1;
- }
- // Here lies the documentation we blatently ignore to make
- // this work >_>...
- *getenv(name) = '\0';
- // This would result in a double null termination, which
- // normally signifies the end of the environment variable
- // list, so we stick a completely empty environment variable
- // into the list instead.
- *(getenv(name) + 1) = '=';
- // If _wenviron is null, the wide environment has not been initialized
- // yet, and we don't need to try to update it.
- // We have to do this otherwise we'd be forcing the initialization and
- // maintenance of the wide environment even though it's never actually
- // used in most programs.
- if (_wenviron != nullptr) {
- wchar_t buf[_MAX_ENV + 1];
- size_t len;
- if (mbstowcs_s(&len, buf, _MAX_ENV + 1, name, _MAX_ENV) != 0) {
- errno = EINVAL;
- return -1;
- }
- *_wgetenv(buf) = u'\0';
- *(_wgetenv(buf) + 1) = u'=';
- }
- // And now, we have to update the outer environment to have
- // a proper empty value.
- if (!SetEnvironmentVariableA(name, value)) {
- errno = EINVAL;
- return -1;
- }
- return 0;
- }
- int unsetenv(const char* name) {
- if (_putenv_s(name, "") != 0) {
- return -1;
- }
- return 0;
- }
- }
- #endif
- #if !__linux__ && !FOLLY_MOBILE
- #include <string>
- #include <vector>
- extern "C" int clearenv() {
- std::vector<std::string> data;
- for (auto it = environ; it && *it; ++it) {
- std::string entry(*it);
- auto equalsPosition = entry.find('=');
- if (equalsPosition == std::string::npos || equalsPosition == 0) {
- // It's either a drive setting (if on Windows), or something clowny is
- // going on in the environment.
- continue;
- } else {
- data.emplace_back(entry.substr(0, equalsPosition));
- }
- }
- for (auto s : data) {
- if (unsetenv(s.c_str()) != 0)
- return -1;
- }
- return 0;
- }
- #endif
|