From: Christopher Dykes <cdykes@fb.com>
Date: Wed, 4 May 2016 23:45:56 +0000 (-0700)
Subject: Create the stdlib.h portability header
X-Git-Tag: 2016.07.26~277
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2d9694873889d9d668d4d0a4238738c8a1ef5a68;p=folly.git

Create the stdlib.h portability header

Summary: Windows doesn't have these functions under these names, so be nice to the code using it.

Reviewed By: yfeldblum

Differential Revision: D3003641

fb-gh-sync-id: 1657545af6975c96aea4a48c359250828b5921e0
fbshipit-source-id: 1657545af6975c96aea4a48c359250828b5921e0
---

diff --git a/folly/Makefile.am b/folly/Makefile.am
index 69887388..912e117b 100644
--- a/folly/Makefile.am
+++ b/folly/Makefile.am
@@ -286,6 +286,7 @@ nobase_follyinclude_HEADERS = \
 	portability/Memory.h \
 	portability/PThread.h \
 	portability/Sockets.h \
+	portability/Stdlib.h \
 	portability/String.h \
 	portability/Syslog.h \
 	portability/SysFile.h \
@@ -432,6 +433,7 @@ libfolly_la_SOURCES = \
 	portability/Malloc.cpp \
 	portability/Memory.cpp \
 	portability/Sockets.cpp \
+	portability/Stdlib.cpp \
 	portability/String.cpp \
 	portability/SysFile.cpp \
 	portability/SysMman.cpp \
diff --git a/folly/portability/Stdlib.cpp b/folly/portability/Stdlib.cpp
new file mode 100644
index 00000000..049443a2
--- /dev/null
+++ b/folly/portability/Stdlib.cpp
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2016 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(ptr);
+  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(ptr);
+  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);
+}
+}
+#endif
diff --git a/folly/portability/Stdlib.h b/folly/portability/Stdlib.h
new file mode 100644
index 00000000..4008c088
--- /dev/null
+++ b/folly/portability/Stdlib.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2016 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.
+ */
+
+#pragma once
+
+#include <cstdlib>
+
+#ifdef _WIN32
+// These are technically supposed to be defined linux/limits.h and
+// sys/param.h respectively, but Windows defines _MAX_PATH in stdlib.h,
+// so, instead of creating two headers for a single define each, we put
+// them here, where they are likely to already have been included in the
+// code that needs them.
+#define PATH_MAX _MAX_PATH
+#define MAXPATHLEN _MAX_PATH
+
+extern "C" {
+char* mktemp(char* tn);
+char* mkdtemp(char* tn);
+int mkstemp(char* tn);
+char* realpath(const char* path, char* resolved_path);
+}
+#endif