X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSystem%2FUnix%2FPath.cpp;h=99923335c5aab2a9f289a0775fdec0da30d65637;hb=af2f208e7c727f75ee279d63c6b722da0d75fced;hp=23b938b9019fceb42d06656d6d78bf004c8c18b4;hpb=1b554b4583044050109f8b70929d6777ec073188;p=oota-llvm.git

diff --git a/lib/System/Unix/Path.cpp b/lib/System/Unix/Path.cpp
index 23b938b9019..99923335c5a 100644
--- a/lib/System/Unix/Path.cpp
+++ b/lib/System/Unix/Path.cpp
@@ -16,55 +16,200 @@
 //===          is guaranteed to work on *all* UNIX variants.
 //===----------------------------------------------------------------------===//
 
-#include <llvm/Config/config.h>
+#include "llvm/Config/alloca.h"
 #include "Unix.h"
+#if HAVE_SYS_STAT_H
 #include <sys/stat.h>
+#endif
+#if HAVE_FCNTL_H
 #include <fcntl.h>
-#include <fstream>
+#endif
+#if HAVE_UTIME_H
+#include <utime.h>
+#endif
+#if HAVE_TIME_H
+#include <time.h>
+#endif
+#if HAVE_DIRENT_H
+# include <dirent.h>
+# define NAMLEN(dirent) strlen((dirent)->d_name)
+#else
+# define dirent direct
+# define NAMLEN(dirent) (dirent)->d_namlen
+# if HAVE_SYS_NDIR_H
+#  include <sys/ndir.h>
+# endif
+# if HAVE_SYS_DIR_H
+#  include <sys/dir.h>
+# endif
+# if HAVE_NDIR_H
+#  include <ndir.h>
+# endif
+#endif
+
 
 namespace llvm {
 using namespace sys;
 
-Path::Path(std::string unverified_path) 
-  : path(unverified_path)
-{
+Path::Path(const std::string& unverified_path) : path(unverified_path) {
   if (unverified_path.empty())
     return;
-  if (this->is_valid()) 
+  if (this->isValid()) 
     return;
   // oops, not valid.
   path.clear();
   ThrowErrno(unverified_path + ": path is not valid");
 }
 
+bool 
+Path::isValid() const {
+  if (path.empty()) 
+    return false;
+  else if (path.length() >= MAXPATHLEN)
+    return false;
+#if defined(HAVE_REALPATH)
+  char pathname[MAXPATHLEN];
+  if (0 == realpath(path.c_str(), pathname))
+    if (errno != EACCES && errno != EIO && errno != ENOENT && errno != ENOTDIR)
+      return false;
+#endif
+  return true;
+}
+
 Path
 Path::GetRootDirectory() {
   Path result;
-  result.set_directory("/");
+  result.setDirectory("/");
   return result;
 }
 
-Path 
-Path::GetSystemLibraryPath1() {
-  return Path("/lib/");
+Path
+Path::GetTemporaryDirectory() {
+#if defined(HAVE_MKDTEMP)
+  // The best way is with mkdtemp but that's not available on many systems, 
+  // Linux and FreeBSD have it. Others probably won't.
+  char pathname[MAXPATHLEN];
+  strcpy(pathname,"/tmp/llvm_XXXXXX");
+  if (0 == mkdtemp(pathname))
+    ThrowErrno(std::string(pathname) + ": Can't create temporary directory");
+  Path result;
+  result.setDirectory(pathname);
+  assert(result.isValid() && "mkdtemp didn't create a valid pathname!");
+  return result;
+#elif defined(HAVE_MKSTEMP)
+  // If no mkdtemp is available, mkstemp can be used to create a temporary file
+  // which is then removed and created as a directory. We prefer this over
+  // mktemp because of mktemp's inherent security and threading risks. We still
+  // have a slight race condition from the time the temporary file is created to
+  // the time it is re-created as a directoy. 
+  char pathname[MAXPATHLEN];
+  strcpy(pathname, "/tmp/llvm_XXXXXX");
+  int fd = 0;
+  if (-1 == (fd = mkstemp(pathname)))
+    ThrowErrno(std::string(pathname) + ": Can't create temporary directory");
+  ::close(fd);
+  ::unlink(pathname); // start race condition, ignore errors
+  if (-1 == ::mkdir(pathname, S_IRWXU)) // end race condition
+    ThrowErrno(std::string(pathname) + ": Can't create temporary directory");
+  Path result;
+  result.setDirectory(pathname);
+  assert(result.isValid() && "mkstemp didn't create a valid pathname!");
+  return result;
+#elif defined(HAVE_MKTEMP)
+  // If a system doesn't have mkdtemp(3) or mkstemp(3) but it does have
+  // mktemp(3) then we'll assume that system (e.g. AIX) has a reasonable
+  // implementation of mktemp(3) and doesn't follow BSD 4.3's lead of replacing
+  // the XXXXXX with the pid of the process and a letter. That leads to only
+  // twenty six temporary files that can be generated.
+  char pathname[MAXPATHLEN];
+  strcpy(pathname, "/tmp/llvm_XXXXXX");
+  char *TmpName = ::mktemp(pathname);
+  if (TmpName == 0)
+    throw std::string(TmpName) + ": Can't create unique directory name";
+  if (-1 == ::mkdir(TmpName, S_IRWXU))
+    ThrowErrno(std::string(TmpName) + ": Can't create temporary directory");
+  Path result;
+  result.setDirectory(TmpName);
+  assert(result.isValid() && "mktemp didn't create a valid pathname!");
+  return result;
+#else
+  // This is the worst case implementation. tempnam(3) leaks memory unless its
+  // on an SVID2 (or later) system. On BSD 4.3 it leaks. tmpnam(3) has thread
+  // issues. The mktemp(3) function doesn't have enough variability in the
+  // temporary name generated. So, we provide our own implementation that 
+  // increments an integer from a random number seeded by the current time. This
+  // should be sufficiently unique that we don't have many collisions between
+  // processes. Generally LLVM processes don't run very long and don't use very
+  // many temporary files so this shouldn't be a big issue for LLVM.
+  static time_t num = ::time(0);
+  char pathname[MAXPATHLEN];
+  do {
+    num++;
+    sprintf(pathname, "/tmp/llvm_%010u", unsigned(num));
+  } while ( 0 == access(pathname, F_OK ) );
+  if (-1 == ::mkdir(pathname, S_IRWXU))
+    ThrowErrno(std::string(pathname) + ": Can't create temporary directory");
+  Path result;
+  result.setDirectory(pathname);
+  assert(result.isValid() && "mkstemp didn't create a valid pathname!");
+  return result;
+#endif
 }
 
-Path 
-Path::GetSystemLibraryPath2() {
-  return Path("/usr/lib/");
+static void getPathList(const char*path, std::vector<sys::Path>& Paths) {
+  const char* at = path;
+  const char* delim = strchr(at, ':');
+  Path tmpPath;
+  while( delim != 0 ) {
+    std::string tmp(at, size_t(delim-at));
+    if (tmpPath.setDirectory(tmp))
+      if (tmpPath.readable())
+        Paths.push_back(tmpPath);
+    at = delim + 1;
+    delim = strchr(at, ':');
+  }
+  if (*at != 0)
+    if (tmpPath.setDirectory(std::string(at)))
+      if (tmpPath.readable())
+        Paths.push_back(tmpPath);
+
 }
 
-Path 
-Path::GetLLVMDefaultConfigDir() {
-  return Path("/etc/llvm/");
+void 
+Path::GetSystemLibraryPaths(std::vector<sys::Path>& Paths) {
+#ifdef LTDL_SHLIBPATH_VAR
+  char* env_var = getenv(LTDL_SHLIBPATH_VAR);
+  if (env_var != 0) {
+    getPathList(env_var,Paths);
+  }
+#endif
+  // FIXME: Should this look at LD_LIBRARY_PATH too?
+  Paths.push_back(sys::Path("/usr/local/lib/"));
+  Paths.push_back(sys::Path("/usr/X11R6/lib/"));
+  Paths.push_back(sys::Path("/usr/lib/"));
+  Paths.push_back(sys::Path("/lib/"));
+}
+
+void
+Path::GetBytecodeLibraryPaths(std::vector<sys::Path>& Paths) {
+  char * env_var = getenv("LLVM_LIB_SEARCH_PATH");
+  if (env_var != 0) {
+    getPathList(env_var,Paths);
+  }
+#ifdef LLVM_LIBDIR
+  {
+    Path tmpPath;
+    if (tmpPath.setDirectory(LLVM_LIBDIR))
+      if (tmpPath.readable())
+        Paths.push_back(tmpPath);
+  }
+#endif
+  GetSystemLibraryPaths(Paths);
 }
 
 Path 
-Path::GetLLVMConfigDir() {
-  Path result;
-  if (result.set_directory(LLVM_ETCDIR))
-    return result;
-  return GetLLVMDefaultConfigDir();
+Path::GetLLVMDefaultConfigDir() {
+  return Path("/etc/llvm/");
 }
 
 Path
@@ -72,24 +217,24 @@ Path::GetUserHomeDirectory() {
   const char* home = getenv("HOME");
   if (home) {
     Path result;
-    if (result.set_directory(home))
+    if (result.setDirectory(home))
       return result;
   }
   return GetRootDirectory();
 }
 
 bool
-Path::is_file() const {
-  return (is_valid() && path[path.length()-1] != '/');
+Path::isFile() const {
+  return (isValid() && path[path.length()-1] != '/');
 }
 
 bool
-Path::is_directory() const {
-  return (is_valid() && path[path.length()-1] == '/');
+Path::isDirectory() const {
+  return (isValid() && path[path.length()-1] == '/');
 }
 
 std::string
-Path::get_basename() const {
+Path::getBasename() const {
   // Find the last slash
   size_t slash = path.rfind('/');
   if (slash == std::string::npos)
@@ -100,29 +245,53 @@ Path::get_basename() const {
   return path.substr(slash, path.rfind('.'));
 }
 
-bool Path::has_magic_number(const std::string &Magic) const {
+bool Path::hasMagicNumber(const std::string &Magic) const {
   size_t len = Magic.size();
-  char buf[ 1 + len];
-  std::ifstream f(path.c_str());
-  f.read(buf, len);
+  assert(len < 1024 && "Request for magic string too long");
+  char* buf = (char*) alloca(1 + len);
+  int fd = ::open(path.c_str(),O_RDONLY);
+  if (fd < 0)
+    return false;
+  size_t read_len = ::read(fd, buf, len);
+  close(fd);
+  if (len != read_len)
+    return false;
   buf[len] = '\0';
   return Magic == buf;
 }
 
-bool 
-Path::is_bytecode_file() const {
-  if (readable()) {
-    return has_magic_number("llvm");
+bool Path::getMagicNumber(std::string& Magic, unsigned len) const {
+  if (!isFile())
+    return false;
+  assert(len < 1024 && "Request for magic string too long");
+  char* buf = (char*) alloca(1 + len);
+  int fd = ::open(path.c_str(),O_RDONLY);
+  if (fd < 0)
+    return false;
+  ssize_t bytes_read = ::read(fd, buf, len);
+  ::close(fd);
+  if (ssize_t(len) != bytes_read) {
+    Magic.clear();
+    return false;
   }
-  return false;
+  Magic.assign(buf,len);
+  return true;
 }
 
-bool
-Path::is_archive() const {
-  if (readable()) {
-    return has_magic_number("!<arch>\012");
-  }
-  return false;
+bool 
+Path::isBytecodeFile() const {
+  char buffer[ 4];
+  buffer[0] = 0;
+  int fd = ::open(path.c_str(),O_RDONLY);
+  if (fd < 0)
+    return false;
+  ssize_t bytes_read = ::read(fd, buffer, 4);
+  ::close(fd);
+  if (4 != bytes_read) 
+    return false;
+
+  return (buffer[0] == 'l' && buffer[1] == 'l' && buffer[2] == 'v' &&
+      (buffer[3] == 'c' || buffer[3] == 'm'));
 }
 
 bool
@@ -167,16 +336,95 @@ Path::getLast() const {
   return path.substr(pos+1);
 }
 
+void
+Path::getStatusInfo(StatusInfo& info) const {
+  struct stat buf;
+  if (0 != stat(path.c_str(), &buf)) {
+    ThrowErrno(std::string("Can't get status: ")+path);
+  }
+  info.fileSize = buf.st_size;
+  info.modTime.fromEpochTime(buf.st_mtime);
+  info.mode = buf.st_mode;
+  info.user = buf.st_uid;
+  info.group = buf.st_gid;
+  info.isDir = S_ISDIR(buf.st_mode);
+  if (info.isDir && path[path.length()-1] != '/')
+    path += '/';
+}
+
+static bool AddPermissionBits(const std::string& Filename, int bits) {
+  // Get the umask value from the operating system.  We want to use it
+  // when changing the file's permissions. Since calling umask() sets
+  // the umask and returns its old value, we must call it a second
+  // time to reset it to the user's preference.
+  int mask = umask(0777); // The arg. to umask is arbitrary.
+  umask(mask);            // Restore the umask.
+
+  // Get the file's current mode.
+  struct stat st;
+  if ((stat(Filename.c_str(), &st)) == -1)
+    return false;
+
+  // Change the file to have whichever permissions bits from 'bits'
+  // that the umask would not disable.
+  if ((chmod(Filename.c_str(), (st.st_mode | (bits & ~mask)))) == -1)
+    return false;
+
+  return true;
+}
+
+void Path::makeReadable() {
+  if (!AddPermissionBits(path,0444))
+    ThrowErrno(path + ": can't make file readable");
+}
+
+void Path::makeWriteable() {
+  if (!AddPermissionBits(path,0222))
+    ThrowErrno(path + ": can't make file writable");
+}
+
+void Path::makeExecutable() {
+  if (!AddPermissionBits(path,0111))
+    ThrowErrno(path + ": can't make file executable");
+}
+
 bool
-Path::set_directory(const std::string& a_path) {
+Path::getDirectoryContents(std::set<Path>& result) const {
+  if (!isDirectory())
+    return false;
+  DIR* direntries = ::opendir(path.c_str());
+  if (direntries == 0)
+    ThrowErrno(path + ": can't open directory");
+
+  result.clear();
+  struct dirent* de = ::readdir(direntries);
+  while (de != 0) {
+    if (de->d_name[0] != '.') {
+      Path aPath(path + (const char*)de->d_name);
+      struct stat buf;
+      if (0 != stat(aPath.path.c_str(), &buf))
+        ThrowErrno(aPath.path + ": can't get status");
+      if (S_ISDIR(buf.st_mode))
+        aPath.path += "/";
+      result.insert(aPath);
+    }
+    de = ::readdir(direntries);
+  }
+  
+  closedir(direntries);
+  return true;
+}
+
+bool
+Path::setDirectory(const std::string& a_path) {
   if (a_path.size() == 0)
     return false;
   Path save(*this);
   path = a_path;
   size_t last = a_path.size() -1;
-  if (last != 0 && a_path[last] != '/')
+  if (a_path[last] != '/')
     path += '/';
-  if (!is_valid()) {
+  if (!isValid()) {
     path = save.path;
     return false;
   }
@@ -184,7 +432,7 @@ Path::set_directory(const std::string& a_path) {
 }
 
 bool
-Path::set_file(const std::string& a_path) {
+Path::setFile(const std::string& a_path) {
   if (a_path.size() == 0)
     return false;
   Path save(*this);
@@ -193,7 +441,7 @@ Path::set_file(const std::string& a_path) {
   while (last > 0 && a_path[last] == '/')
     last--;
   path.erase(last+1);
-  if (!is_valid()) {
+  if (!isValid()) {
     path = save.path;
     return false;
   }
@@ -201,13 +449,13 @@ Path::set_file(const std::string& a_path) {
 }
 
 bool
-Path::append_directory(const std::string& dir) {
-  if (is_file()) 
+Path::appendDirectory(const std::string& dir) {
+  if (isFile()) 
     return false;
   Path save(*this);
   path += dir;
   path += "/";
-  if (!is_valid()) {
+  if (!isValid()) {
     path = save.path;
     return false;
   }
@@ -215,8 +463,8 @@ Path::append_directory(const std::string& dir) {
 }
 
 bool
-Path::elide_directory() {
-  if (is_file()) 
+Path::elideDirectory() {
+  if (isFile()) 
     return false;
   size_t slashpos = path.rfind('/',path.size());
   if (slashpos == 0 || slashpos == std::string::npos)
@@ -230,12 +478,12 @@ Path::elide_directory() {
 }
 
 bool
-Path::append_file(const std::string& file) {
-  if (!is_directory()) 
+Path::appendFile(const std::string& file) {
+  if (!isDirectory()) 
     return false;
   Path save(*this);
   path += file;
-  if (!is_valid()) {
+  if (!isValid()) {
     path = save.path;
     return false;
   }
@@ -243,8 +491,8 @@ Path::append_file(const std::string& file) {
 }
 
 bool
-Path::elide_file() {
-  if (is_directory()) 
+Path::elideFile() {
+  if (isDirectory()) 
     return false;
   size_t slashpos = path.rfind('/',path.size());
   if (slashpos == std::string::npos)
@@ -254,13 +502,13 @@ Path::elide_file() {
 }
 
 bool
-Path::append_suffix(const std::string& suffix) {
-  if (is_directory()) 
+Path::appendSuffix(const std::string& suffix) {
+  if (isDirectory()) 
     return false;
   Path save(*this);
   path.append(".");
   path.append(suffix);
-  if (!is_valid()) {
+  if (!isValid()) {
     path = save.path;
     return false;
   }
@@ -268,8 +516,8 @@ Path::append_suffix(const std::string& suffix) {
 }
 
 bool 
-Path::elide_suffix() {
-  if (is_directory()) return false;
+Path::elideSuffix() {
+  if (isDirectory()) return false;
   size_t dotpos = path.rfind('.',path.size());
   size_t slashpos = path.rfind('/',path.size());
   if (slashpos != std::string::npos && dotpos != std::string::npos &&
@@ -282,9 +530,9 @@ Path::elide_suffix() {
 
 
 bool
-Path::create_directory( bool create_parents) {
+Path::createDirectory( bool create_parents) {
   // Make sure we're dealing with a directory
-  if (!is_directory()) return false;
+  if (!isDirectory()) return false;
 
   // Get a writeable copy of the path name
   char pathname[MAXPATHLEN];
@@ -294,6 +542,8 @@ Path::create_directory( bool create_parents) {
   int lastchar = path.length() - 1 ; 
   if (pathname[lastchar] == '/') 
     pathname[lastchar] = 0;
+  else 
+    pathname[lastchar+1] = 0;
 
   // If we're supposed to create intermediate directories
   if ( create_parents ) {
@@ -309,31 +559,53 @@ Path::create_directory( bool create_parents) {
         if (0 != mkdir(pathname, S_IRWXU | S_IRWXG))
           ThrowErrno(std::string(pathname) + ": Can't create directory");
       char* save = next;
-      next = strchr(pathname,'/');
+      next = strchr(next+1,'/');
       *save = '/';
     }
-  } else if (0 != mkdir(pathname, S_IRWXU | S_IRWXG)) {
-    ThrowErrno(std::string(pathname) + ": Can't create directory");
   } 
+
+  if (0 != access(pathname, F_OK | R_OK))
+    if (0 != mkdir(pathname, S_IRWXU | S_IRWXG))
+      ThrowErrno(std::string(pathname) + ": Can't create directory");
   return true;
 }
 
 bool
-Path::create_file() {
+Path::createFile() {
   // Make sure we're dealing with a file
-  if (!is_file()) return false; 
+  if (!isFile()) return false; 
 
   // Create the file
-  if (0 != creat(path.c_str(), S_IRUSR | S_IWUSR))
-    ThrowErrno(std::string(path.c_str()) + ": Can't create file");
+  int fd = ::creat(path.c_str(), S_IRUSR | S_IWUSR);
+  if (fd < 0)
+    ThrowErrno(path + ": Can't create file");
+  ::close(fd);
 
   return true;
 }
 
 bool
-Path::destroy_directory(bool remove_contents) {
+Path::createTemporaryFile(bool reuse_current) {
+  // Make sure we're dealing with a file
+  if (!isFile()) 
+    return false;
+
+  // Make this into a unique file name
+  makeUnique( reuse_current );
+
+  // create the file
+  int outFile = ::open(path.c_str(), O_WRONLY|O_CREAT|O_TRUNC, 0666);
+  if (outFile != -1) {
+    ::close(outFile);
+    return true;
+  }
+  return false;
+}
+
+bool
+Path::destroyDirectory(bool remove_contents) const {
   // Make sure we're dealing with a directory
-  if (!is_directory()) return false;
+  if (!isDirectory()) return false;
 
   // If it doesn't exist, we're done.
   if (!exists()) return true;
@@ -350,6 +622,8 @@ Path::destroy_directory(bool remove_contents) {
     int lastchar = path.length() - 1 ; 
     if (pathname[lastchar] == '/') 
       pathname[lastchar] = 0;
+    else
+      pathname[lastchar+1] = 0;
     if ( 0 != rmdir(pathname))
       ThrowErrno(std::string(pathname) + ": Can't destroy directory");
   }
@@ -357,13 +631,122 @@ Path::destroy_directory(bool remove_contents) {
 }
 
 bool
-Path::destroy_file() {
-  if (!is_file()) return false;
+Path::destroyFile() const {
+  if (!isFile()) return false;
   if (0 != unlink(path.c_str()))
-    ThrowErrno(std::string(path.c_str()) + ": Can't destroy file");
+    ThrowErrno(path + ": Can't destroy file");
+  return true;
+}
+
+bool
+Path::renameFile(const Path& newName) {
+  if (!isFile()) return false;
+  if (0 != rename(path.c_str(), newName.c_str()))
+    ThrowErrno(std::string("can't rename ") + path + " as " + 
+               newName.toString());
+  return true;
+}
+
+bool
+Path::setStatusInfo(const StatusInfo& si) const {
+  if (!isFile()) return false;
+  struct utimbuf utb;
+  utb.actime = si.modTime.toPosixTime();
+  utb.modtime = utb.actime;
+  if (0 != ::utime(path.c_str(),&utb))
+    ThrowErrno(path + ": can't set file modification time");
+  if (0 != ::chmod(path.c_str(),si.mode))
+    ThrowErrno(path + ": can't set mode");
   return true;
 }
 
+void 
+sys::CopyFile(const sys::Path &Dest, const sys::Path &Src) {
+  int inFile = -1;
+  int outFile = -1;
+  try {
+    inFile = ::open(Src.c_str(), O_RDONLY);
+    if (inFile == -1)
+      ThrowErrno("Cannnot open source file to copy: " + Src.toString());
+
+    outFile = ::open(Dest.c_str(), O_WRONLY|O_CREAT, 0666);
+    if (outFile == -1)
+      ThrowErrno("Cannnot create destination file for copy: " +Dest.toString());
+
+    char Buffer[16*1024];
+    while (ssize_t Amt = ::read(inFile, Buffer, 16*1024)) {
+      if (Amt == -1) {
+        if (errno != EINTR && errno != EAGAIN) 
+          ThrowErrno("Can't read source file: " + Src.toString());
+      } else {
+        char *BufPtr = Buffer;
+        while (Amt) {
+          ssize_t AmtWritten = ::write(outFile, BufPtr, Amt);
+          if (AmtWritten == -1) {
+            if (errno != EINTR && errno != EAGAIN) 
+              ThrowErrno("Can't write destination file: " + Dest.toString());
+          } else {
+            Amt -= AmtWritten;
+            BufPtr += AmtWritten;
+          }
+        }
+      }
+    }
+    ::close(inFile);
+    ::close(outFile);
+  } catch (...) {
+    if (inFile != -1)
+      ::close(inFile);
+    if (outFile != -1)
+      ::close(outFile);
+    throw;
+  }
+}
+
+void 
+Path::makeUnique(bool reuse_current) {
+  if (reuse_current && !exists())
+    return; // File doesn't exist already, just use it!
+
+  // Append an XXXXXX pattern to the end of the file for use with mkstemp, 
+  // mktemp or our own implementation.
+  char *FNBuffer = (char*) alloca(path.size()+8);
+  path.copy(FNBuffer,path.size());
+  strcpy(FNBuffer+path.size(), "-XXXXXX");
+
+#if defined(HAVE_MKSTEMP)
+  int TempFD;
+  if ((TempFD = mkstemp(FNBuffer)) == -1) {
+    ThrowErrno("Cannot make unique filename for '" + path + "'");
+  }
+
+  // We don't need to hold the temp file descriptor... we will trust that no one
+  // will overwrite/delete the file before we can open it again.
+  close(TempFD);
+
+  // Save the name
+  path = FNBuffer;
+#elif defined(HAVE_MKTEMP)
+  // If we don't have mkstemp, use the old and obsolete mktemp function.
+  if (mktemp(FNBuffer) == 0) {
+    ThrowErrno("Cannot make unique filename for '" + path + "'");
+  }
+
+  // Save the name
+  path = FNBuffer;
+#else
+  // Okay, looks like we have to do it all by our lonesome.
+  static unsigned FCounter = 0;
+  unsigned offset = path.size() + 1;
+  while ( FCounter < 999999 && exists()) {
+    sprintf(FNBuffer+offset,"%06u",++FCounter);
+    path = FNBuffer;
+  }
+  if (FCounter > 999999)
+    throw std::string("Cannot make unique filename for '" + path + "'");
+#endif
+
+}
 }
 
 // vim: sw=2