Use FileManager API to get current working directory

- FileManager handles long file name prefixes on Windows correctly.
  This keeps any UNC long file prefix (\\?\) out of
  URL that were relative and then resolved to absolute urls.

Author: daveinglis

Sources/CoreFoundation/CFPlatform.c

@@ -42,7 +42,6 @@
 #define SECURITY_WIN32
 #include <Security.h>
 
-#define getcwd _NS_getcwd
 #define open _NS_open
 
 #endif
@@ -69,11 +68,6 @@ char **_CFArgv(void) { return *_NSGetArgv(); }
 int _CFArgc(void) { return *_NSGetArgc(); }
 #endif
 
-
-CF_PRIVATE Boolean _CFGetCurrentDirectory(char *path, int maxlen) {
-    return getcwd(path, maxlen) != NULL;
-}
-
 #if TARGET_OS_WIN32
 // Returns the path to the CF DLL, which we can then use to find resources like char sets
 bool bDllPathCached = false;
@@ -1131,24 +1125,6 @@ CF_EXPORT int _NS_unlink(const char *name) {
     return res;
 }
 
-// Warning: this doesn't support dstbuf as null even though 'getcwd' does
-CF_EXPORT char *_NS_getcwd(char *dstbuf, size_t size) {
-    if (!dstbuf) {
-	CFLog(kCFLogLevelWarning, CFSTR("CFPlatform: getcwd called with null buffer"));
-	return 0;
-    }
-    
-    wchar_t *buf = _wgetcwd(NULL, 0);
-    if (!buf) {
-        return NULL;
-    }
-        
-    // Convert result to UTF8
-    copyToNarrowFileSystemRepresentation(buf, (CFIndex)size, dstbuf);
-    free(buf);
-    return dstbuf;
-}
-
 CF_EXPORT char *_NS_getenv(const char *name) {
     // todo: wide getenv
     // We have to be careful what happens here, because getenv is called during cf initialization, and things like cfstring may not be working yet

Sources/CoreFoundation/include/ForFoundationOnly.h

@@ -527,7 +527,6 @@ CF_EXPORT int _NS_mkdir(const char *name);
 CF_EXPORT int _NS_rmdir(const char *name);
 CF_EXPORT int _NS_chmod(const char *name, int mode);
 CF_EXPORT int _NS_unlink(const char *name);
-CF_EXPORT char *_NS_getcwd(char *dstbuf, size_t size);     // Warning: this doesn't support dstbuf as null even though 'getcwd' does
 CF_EXPORT char *_NS_getenv(const char *name);
 CF_EXPORT int _NS_rename(const char *oldName, const char *newName);
 CF_EXPORT int _NS_open(const char *name, int oflag, int pmode);

Sources/CoreFoundation/internalInclude/CoreFoundation_Prefix.h

@@ -374,7 +374,6 @@ CF_EXPORT int _NS_mkdir(const char *name);
 CF_EXPORT int _NS_rmdir(const char *name);
 CF_EXPORT int _NS_chmod(const char *name, int mode);
 CF_EXPORT int _NS_unlink(const char *name);
-CF_EXPORT char *_NS_getcwd(char *dstbuf, size_t size);     // Warning: this doesn't support dstbuf as null even though 'getcwd' does
 CF_EXPORT char *_NS_getenv(const char *name);
 CF_EXPORT int _NS_rename(const char *oldName, const char *newName);
 CF_EXPORT int _NS_open(const char *name, int oflag, int pmode);

Sources/Foundation/FileManager.swift

@@ -681,3 +681,28 @@ extension FileManager {
         }
     }
 }
+
+// Used in CFURL.c (use FileManager API so that platform specifics like long path prefix strip can be handled in a single place)
+@_cdecl("_CFGetCurrentDirectory")
+internal func _CFGetCurrentDirectory(_ buffer: UnsafeMutablePointer<CChar>?, _ size: Int) -> Bool {
+    guard let buffer = buffer, size > 0 else {
+        return false // Invalid parameters
+    }
+    
+    let currentPath = FileManager.default.currentDirectoryPath
+    
+    // Convert to C string representation
+    let cString = currentPath.utf8CString
+    let requiredSize = cString.count // includes null terminator
+    
+    if requiredSize > size {
+        return false // Buffer too small
+    }
+    
+    // Copy the string to the buffer
+    cString.withUnsafeBufferPointer { sourceBuffer in
+        buffer.initialize(from: sourceBuffer.baseAddress!, count: requiredSize)
+    }
+    
+    return true // Success
+}