hphp/util/file.h

   1 /*
   2    +----------------------------------------------------------------------+
   3    | HipHop for PHP                                                       |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 2010-present Facebook, Inc. (http://www.facebook.com)  |
   6    +----------------------------------------------------------------------+
   7    | This source file is subject to version 3.01 of the PHP license,      |
   8    | that is bundled with this package in the file LICENSE, and is        |
   9    | available through the world-wide-web at the following url:           |
  10    | http://www.php.net/license/3_01.txt                                  |
  11    | If you did not receive a copy of the PHP license and are unable to   |
  12    | obtain it through the world-wide-web, please send a note to          |
  13    | license@php.net so we can mail you a copy immediately.               |
  14    +----------------------------------------------------------------------+
  15 */
  16
  17 #ifndef incl_HPHP_UTIL_FILE_H_
  18 #define incl_HPHP_UTIL_FILE_H_
  19
  20 #include <folly/Range.h>
  21
  22 #include <ctype.h>
  23
  24 namespace HPHP { namespace FileUtil {
  25 ////////////////////////////////////////////////////////////////////////////////
  26
  27 /*
  28  * Check if the given character is a directory separator for the current
  29  * platform.
  30  */
  31 inline bool isDirSeparator(char c) {
  32 #ifdef _MSC_VER
  33   return c == '/' || c == '\\';
  34 #else
  35   return c == '/';
  36 #endif
  37 }
  38
  39 /*
  40  * Get the preferred directory separator for the current platform.
  41  */
  42 inline char getDirSeparator() {
  43 #ifdef _MSC_VER
  44   return '\\';
  45 #else
  46   return '/';
  47 #endif
  48 }
  49
  50 /*
  51  * Check if the given path is an absolute path.  This does not guarantee that
  52  * the path is canonicalized.
  53  */
  54 inline bool isAbsolutePath(folly::StringPiece path) {
  55 #ifdef _MSC_VER
  56   auto const len = path.size();
  57   if (len < 2) {
  58     return false;
  59   }
  60   // NOTE: Boost actually checks if the last character of the first path element
  61   // is a colon, rather than if the first character is an alpha followed by a
  62   // colon.  This is fine for now, as I don't know of any other forms of paths
  63   // that would allow.
  64   return (isDirSeparator(path[0]) && isDirSeparator(path[1])) ||
  65     (isalpha(path[0]) && path[1] == ':');
  66 #else
  67   return path.size() > 0 && path[0] == '/';
  68 #endif
  69 }
  70
  71 ////////////////////////////////////////////////////////////////////////////////
  72 }}
  73
  74 #endif