src/filename_isdir.cxx

   1 //
   2 // "$Id: filename_isdir.cxx 8063 2010-12-19 21:20:10Z matt $"
   3 //
   4 // Directory detection routines for the Fast Light Tool Kit (FLTK).
   5 //
   6 // Copyright 1998-2010 by Bill Spitzak and others.
   7 //
   8 // This library is free software; you can redistribute it and/or
   9 // modify it under the terms of the GNU Library General Public
  10 // License as published by the Free Software Foundation; either
  11 // version 2 of the License, or (at your option) any later version.
  12 //
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 // Library General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU Library General Public
  19 // License along with this library; if not, write to the Free Software
  20 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21 // USA.
  22 //
  23 // Please report all bugs and problems on the following page:
  24 //
  25 //     http://www.fltk.org/str.php
  26 //
  27
  28 // Used by fl_file_chooser
  29
  30 #include "flstring.h"
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <ctype.h>
  34 #include <FL/filename.H>
  35 #include <FL/fl_utf8.h>
  36
  37
  38 #if defined(WIN32) || defined(__EMX__) && !defined(__CYGWIN__)
  39 static inline int isdirsep(char c) {return c=='/' || c=='\\';}
  40 #else
  41 #define isdirsep(c) ((c)=='/')
  42 #endif
  43
  44 int _fl_filename_isdir_quick(const char* n) {
  45   // Do a quick optimization for filenames with a trailing slash...
  46   if (*n && isdirsep(n[strlen(n) - 1])) return 1;
  47   return fl_filename_isdir(n);
  48 }
  49
  50 /**
  51    Determines if a file exists and is a directory from its filename.
  52    \code
  53    #include <FL/filename.H>
  54    [..]
  55    fl_filename_isdir("/etc");           // returns non-zero
  56    fl_filename_isdir("/etc/hosts");     // returns 0
  57    \endcode
  58    \param[in] n the filename to parse
  59    \return non zero if file exists and is a directory, zero otherwise
  60 */
  61 int fl_filename_isdir(const char* n) {
  62   struct stat   s;
  63   char          fn[FL_PATH_MAX];
  64   int           length;
  65
  66   length = strlen(n);
  67
  68 #ifdef WIN32
  69   // This workaround brought to you by the fine folks at Microsoft!
  70   // (read lots of sarcasm in that...)
  71   if (length < (int)(sizeof(fn) - 1)) {
  72     if (length < 4 && isalpha(n[0]) && n[1] == ':' &&
  73         (isdirsep(n[2]) || !n[2])) {
  74       // Always use D:/ for drive letters
  75       fn[0] = n[0];
  76       strcpy(fn + 1, ":/");
  77       n = fn;
  78     } else if (length > 0 && isdirsep(n[length - 1])) {
  79       // Strip trailing slash from name...
  80       length --;
  81       memcpy(fn, n, length);
  82       fn[length] = '\0';
  83       n = fn;
  84     }
  85   }
  86 #else
  87   // Matt: Just in case, we strip the slash for other operating
  88   // systems as well, avoid bugs by sloppy implementations
  89   // of "stat".
  90   if (length > 1 && isdirsep(n[length - 1])) {
  91     length --;
  92     memcpy(fn, n, length);
  93     fn[length] = '\0';
  94     n = fn;
  95   }
  96 #endif
  97
  98   return !fl_stat(n, &s) && (s.st_mode&0170000)==0040000;
  99 }
 100
 101 //
 102 // End of "$Id: filename_isdir.cxx 8063 2010-12-19 21:20:10Z matt $".
 103 //