pathutil.h

/*   Written by Richard David Cook
     at Lawrence Livermore National Laboratory
     Contact:  wealthychef@gmail.com
     See license.txt for information about usage.
     Spoiler alert:  it's GNU opensource.
*/

#ifndef RDC_PATHUTIL_H
#define RDC_PATHUTIL_H
#include "stringutil.h"

#include <limits.h>
//===============================================================
/*!
  Returns the full path to the directory containing the given file or directory, without the trailing "/", unless the result is "/" itself.
  Examples:
  Dirname("/usr/local") == "/usr"
  Dirname("/usr/local/") == "/usr"
  Dirname("relative/path") == "/full/path/to/relative"
  Dirname("my/directory/") == "/full/path/to/my"
  Dirname("/") == "/"

*/
inline string Dirname(string filename) {
  string dirname = StripBack(filename, "/");

  if (!dirname.length()) return string("/");

  if (dirname[0] != '/')  {
    // need to switch to absolute path
    char wd[PATH_MAX]; // this is why I hate C programming -- there is no way to be sure about buffer overflows with this kind of crap lingering around
    getcwd(wd, PATH_MAX);

    string::size_type loc = dirname.find("/");
    if (loc == string::npos) {
      return string(wd);
    }
    // prepend current working directory to mDirname
    dirname  = string(wd) + "/" + dirname;
  }
  string::size_type loc = dirname.rfind("/");
  if (loc == string::npos) { // reality check
    throw string("Error in Dirname(): Logic error: there are no '/' chars in supposedly absolute path: ") + dirname;
  }
  return  StripBack(dirname.substr(0,loc),"/");
}

//===============================================================
/*!
  Returns the last link of the filename, ala the "basename" shell command.
*/
inline string Basename(string filename) {
  filename = StripBack(filename, "/");
  string::size_type loc = filename.rfind("/");
  if (loc == string::npos) {
    return filename;
  }
  string filename2 = filename.substr(loc+1);

  return filename2;
}
#endif