Remove custom version of readlink in pgut_port

Michael Paquier · Michael Paquier · commit fa248a05078c · 2016-01-20T13:19:59.000+09:00
Postgres has its own version in lpgport relying on junction points,
so if we consider a WIN32 port this is actually not necessary.
diff --git a/pgut/pgut-port.c b/pgut/pgut-port.c
@@ -15,117 +15,6 @@
 #include <unistd.h>
 #include <fcntl.h>
 
-#ifdef WIN32
-
-#include <winioctl.h>
-
-#define REPARSE_DATA_SIZE		1024
-
-/* same layout as REPARSE_DATA_BUFFER, which is defined only in old winnt.h */
-typedef struct REPARSE_DATA
-{
-	ULONG	ReparseTag;
-	WORD	ReparseDataLength;
-	WORD	Reserved;
-	union
-	{
-		struct
-		{
-			WORD	SubstituteNameOffset;
-			WORD	SubstituteNameLength;
-			WORD	PrintNameOffset;
-			WORD	PrintNameLength;
-			ULONG	Flags;
-			WCHAR	PathBuffer[1];
-		} Symlink;
-		struct
-		{
-			WORD	SubstituteNameOffset;
-			WORD	SubstituteNameLength;
-			WORD	PrintNameOffset;
-			WORD	PrintNameLength;
-			WCHAR	PathBuffer[1];
-		} Mount;
-		struct
-		{
-			BYTE  DataBuffer[REPARSE_DATA_SIZE];
-		} Generic;
-	};
-} REPARSE_DATA;
-
-ssize_t
-readlink(const char *path, char *target, size_t size)
-{
-    HANDLE			handle;
- 	DWORD			attr;
-	REPARSE_DATA	data;
- 	DWORD			datasize;
-	PCWSTR			wpath;
-	int				wlen;
-	int				r;
-
-	attr = GetFileAttributes(path);
-	if (attr == INVALID_FILE_ATTRIBUTES)
-	{
-		_dosmaperr(GetLastError());
-        return -1;
-    }
-	if ((attr & FILE_ATTRIBUTE_REPARSE_POINT) == 0)
-	{
-		errno = EINVAL;	/* not a symlink */
-        return -1;
-	}
-
-    handle = CreateFileA(path, 0,
-		FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE, NULL,
-		OPEN_EXISTING,
-        FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT, NULL);
-	if (handle == INVALID_HANDLE_VALUE)
-	{
-		_dosmaperr(GetLastError());
-        return -1;
-    }
-
-	wpath = NULL;
-	if (DeviceIoControl(handle, FSCTL_GET_REPARSE_POINT, NULL, 0,
-        &data, sizeof(data), &datasize, NULL))
-	{
-		switch (data.ReparseTag)
-		{
-			case IO_REPARSE_TAG_MOUNT_POINT:
-			{
-				wpath = data.Mount.PathBuffer + data.Mount.SubstituteNameOffset;
-				wlen = data.Mount.SubstituteNameLength;
-				break;
-			}
-			case IO_REPARSE_TAG_SYMLINK:
-			{
-				wpath = data.Symlink.PathBuffer + data.Symlink.SubstituteNameOffset;
-				wlen = data.Symlink.SubstituteNameLength;
-				break;
-			}
-		}
-	}
-
-	if (wpath == NULL)
-		r = -1;
-	else
-	{
-		if (wcsncmp(wpath, L"\\??\\", 4) == 0 ||
-			wcsncmp(wpath, L"\\\\?\\", 4) == 0)
-		{
-			wpath += 4;
-			wlen -= 4;
-		}
-		r = WideCharToMultiByte(CP_ACP, 0, wpath, wlen, target, size, NULL, NULL);
-	}
-
-	CloseHandle(handle);
-	return r;
-}
-
-#endif
-
 #ifdef PGUT_FLOCK
 
 #ifdef WIN32
diff --git a/pgut/pgut-port.h b/pgut/pgut-port.h
@@ -10,20 +10,6 @@
 #ifndef PGUT_PORT_H
 #define PGUT_PORT_H
 
-/*
- * readlink ports
- */
-#ifdef WIN32
-
-#define S_IFLNK			(0)
-#define S_IRWXG			(0)
-#define S_IRWXO			(0)
-#define S_ISLNK(mode)	(0)
-
-extern ssize_t readlink(const char *path, char *target, size_t size);
-
-#endif
-
 /*
  * flock ports
  */
