commit fc25e3ac97de825aee770f5b8b17c5c0bc2cbcb6
author Martin Storsjö <martin@martin.st> Tue Oct 27 13:30:34 2020 +0200
committer Copybara-Service <copybara-worker@google.com> Fri Dec 18 01:32:45 2020 -0800
tree d683ef21ac2101dd160693eab1831ee945f171f7
parent 367d7f0789d0fbac5b2bf30a638390ce9ffe1cb3

[libcxx] Convert paths to/from the right narrow code page for narrow strings on windows

On windows, the narrow, char based paths normally don't use utf8, but
can use many different native code pages, and this is what system
functions that operate on files, taking such paths/file names, interpret
them as.

Differential Revision: https://reviews.llvm.org/D91137

GitOrigin-RevId: de698ae73444b5160dd6b8d768b30d6764be004e

src/filesystem/operations.cpp

diff --git a/src/filesystem/operations.cpp b/src/filesystem/operations.cpp
index 12592f2..70b531e 100644
--- a/src/filesystem/operations.cpp
+++ b/src/filesystem/operations.cpp
@@ -17,9 +17,15 @@
 
 #include "filesystem_common.h"
 
-#include <unistd.h>
-#include <sys/stat.h>
-#include <sys/statvfs.h>
+#if defined(_LIBCPP_WIN32API)
+# define WIN32_LEAN_AND_MEAN
+# define NOMINMAX
+# include <windows.h>
+#else
+# include <unistd.h>
+# include <sys/stat.h>
+# include <sys/statvfs.h>
+#endif
 #include <time.h>
 #include <fcntl.h> /* values for fchmodat */
 
@@ -1680,6 +1686,36 @@
   return *this;
 }
 
+#if defined(_LIBCPP_WIN32API)
+////////////////////////////////////////////////////////////////////////////
+// Windows path conversions
+size_t __wide_to_char(const wstring &str, char *out, size_t outlen) {
+  if (str.empty())
+    return 0;
+  ErrorHandler<size_t> err("__wide_to_char", nullptr);
+  UINT codepage = AreFileApisANSI() ? CP_ACP : CP_OEMCP;
+  BOOL used_default = FALSE;
+  int ret = WideCharToMultiByte(codepage, 0, str.data(), str.size(), out,
+                                outlen, nullptr, &used_default);
+  if (ret <= 0 || used_default)
+    return err.report(errc::illegal_byte_sequence);
+  return ret;
+}
+
+size_t __char_to_wide(const string &str, wchar_t *out, size_t outlen) {
+  if (str.empty())
+    return 0;
+  ErrorHandler<size_t> err("__char_to_wide", nullptr);
+  UINT codepage = AreFileApisANSI() ? CP_ACP : CP_OEMCP;
+  int ret = MultiByteToWideChar(codepage, MB_ERR_INVALID_CHARS, str.data(),
+                                str.size(), out, outlen);
+  if (ret <= 0)
+    return err.report(errc::illegal_byte_sequence);
+  return ret;
+}
+#endif
+
+
 ///////////////////////////////////////////////////////////////////////////////
 //                           directory entry definitions
 ///////////////////////////////////////////////////////////////////////////////